Endocrinology and Metabolism

Jeong Taek Woo (Woo JT)

44 Articles

A Case of Primary Adrenal Insufficiency in a Patient with Acquired Immunodeficiency Syndrome.: Jae Ho Choi, Suk Chon, Yu Chul Hwang, Jun Seong Son, Seung Joon Oh, Kyu Jeung Ahn, Ho Yeon Chung, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, In Kyung Jeong; Endocrinol Metab. 2011;26(3):253-257. Published online September 1, 2011; DOI: https://doi.org/10.3803/EnM.2011.26.3.253

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The adrenal gland is the most commonly involved endocrine organ in patients infected with the human immunodeficiency virus (HIV). Adrenal function abnormality is more common in HIV patients than in the general population. It is important to recognize the condition of adrenal insufficiency, as this adrenal disorder may prove fatal if left untreated. Herein, we report a case of primary adrenal insufficiency in a 37-year-old male patient with acquired immunodeficiency syndrome. The patient complained of fever, general weakness, and fatigue. Impaired adrenal function was noted in the rapid ACTH stimulation test. After steroid supplementation, the patient's symptoms were improved. Therefore, HIV care physicians should ascertain adrenal dysfunction in HIV patients when they complain of fever and general weakness.

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A Case Report of Adrenal Insufficiency Treated with Korean Medicine
Young-ji Kim, Jung-yeon Kwon, Ho-yeon Go, Kyung-hwan Kong
The Journal of Internal Korean Medicine.2017; 38(5): 583. CrossRef

A Case of Type Ia Glycogen Storage Disease Diagnosed in the Military Hospital.: Tae Woong Lee, Sang Youl Rhee, Joo Young Kim, Gu Hwan Kim, Han Wook Yoo, Jeong Taek Woo, Byung Ho Kim; Endocrinol Metab. 2011;26(1):84-88. Published online March 1, 2011; DOI: https://doi.org/10.3803/EnM.2011.26.1.84

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Abstract PDF: We report here on a case of genetically confirmed type Ia glycogen storage disease (GSD) that was diagnosed in the military hospital. A twenty-year old soldier was admitted to the hospital with abdominal fullness. He had a past medical history of hepatomegaly that was firstly recognized at six months after birth, and he had been followed-up at an outpatient clinic with the presumptive diagnosis of type III GSD. He also had a history of growth hormone therapy because of growth retardation. However, he arbitrarily refused medical observation from 14 years of age. On the physical examination, the height of the patient was 163.1 cm and significant hepatomegaly was observed. Significantly abnormal liver-associated paramters were observed on the laboratory findings and multiple hepatic adenomas were observed on the CT exam and MRI scan. To determine the proper treatment, we tried to confirm the exact type of GSD in the patient. By mutational analysis, we found the c.648G>T homozygote splicing mutation in the G6PC gene and the patient was confirmed as having the type Ia GSD.

A Family Presenting with Catastrophic Features due to Pheochromocytoma Associated with Multiple Endocrine Neoplasia 2A.: Yun Jung Lee, Suk Chon, Sang Ho Lee, Tae Won Lee, Chun Gyoo Ihm, Tae June Noh, Seungjoon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim; Endocrinol Metab. 2010;25(2):135-141. Published online June 1, 2010; DOI: https://doi.org/10.3803/EnM.2010.25.2.135

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Abstract PDF: Multiple endocrine neoplasia 2A (MEN 2A) is an autosomal dominant disease that consists of medullary thyroid carcinoma (MTC), pheochromocytoma and parathyroid hyperplasia. The activation of germ-line mutations in the RET proto-oncogene are responsible for MEN 2A. We describe here a rare case of MEN 2A in a patient who presented with an acute catecholamine-induced cardiomyopathy with cardiogenic shock and acute renal failure. The patient was diagnosed with pheochromocytoma and MTC associated with MEN 2A, which was confirmed by the detection of a RET proto-oncogene mutation at exon 11 on codon 634 (Cys634Arg). During familial screening, the patient's younger sister was found to have a benign thyroid nodule. Re-evaluation of this thyroid nodule revealed MTC with the same gene mutation. We also provide a review of the relevant literature.

Isolation of Density Enrichment Fraction of Adipose-Derived Stem Cells from Stromal Vascular Fraction by Gradient Centrifugation Method.: Min Kyung Kim, Yong Soon Park, Hee Soon Park, Jung Mook Choi, Won Jun Kim, Se Eun Park, Eun Jung Rhee, Cheol Young Park, Won Young Lee, Ki Won Oh, Sung Woo Park, Sun Woo Kim, Kwang Sik Suh, Jeong Taek Woo; Endocrinol Metab. 2010;25(2):103-109. Published online June 1, 2010; DOI: https://doi.org/10.3803/EnM.2010.25.2.103

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BACKGROUND
Adipose tissues include multipotent cells, the same as bone marrow-derived mesenchymal stem cells. The stromal vascular fractions (SVFs) from adipose tissues represent a heterogeneous cell population. The purpose of this study was to isolate and purify adipose-derived stem cells (ASCs) in SVFs by the density gradient method. METHODS: SVFs were extracted from the subcutaneous, epididymal, mesenteric and retroperitoneal adipose tissue of 8 weeks old male Sprague-Dawley rats (n = 15) and these were separated into 4 layers according to a Nycodenz gradient (Fx-1: < 11%, Fx-2: 11-13%, Fx-3: 13-19% and Fx-4: 19-30%). The post-confluent SVFs were cultured in adipogenic medium for 2 days, in insulin medium for 2 days and in 10% fetal bovine serum medium for 5 days. To observe lipid droplets in SVFs, we performed Oil Red O staining. RESLTS: The SVFs' cellular fractions (Fx-1, Fx-2, Fx-3 and Fx-4) were isolated by density gradient centrifugation from the adipose tissues of rats. The SVFs extracted to fraction 3 (Fx-3) had the most abundant cells compared to that of the other fractions. However fraction 1 (Fx-1) or 2 (Fx-2) had a superior ability to make lipid droplets. The adipogenic differentiation of Fx-1 or 2 was higher than that of the unfractionated cells. The SVFs extracted from retroperitoneal adipose tissue had the highest efficiency for adipogenic differentiation, whereas the SVFs from mesenteric adipose tissue did not differentiate. CONCLUSION: This density gradient fractionated method leads to efficient isolation and purification of cells with the characteristics of ASCs.

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Embolic Infarction Presented after Intravenous Injection of Stromal Vascular Fraction
Jin Young Seo, Ju-Hun Lee, Hong-Ki Song, Jong Seok Bae, Yerim Kim
Journal of Neurosonology and Neuroimaging.2018; 10(2): 181. CrossRef

A Case of Type I Osteogenesis Imperfecta Differentially Diagnosed as a Cause of a Spinal Compression Fracture.: Sang Youl Rhee, Soo Young Moon, Suk Chon, In Kyung Jeong, Seungjoon Oh, Kyu Jeung Ahn, Ho Yeon Chung, Jeong Taek Woo, Sung Woon Kim, Young Seol Kim, Jin Woo Kim; J Korean Endocr Soc. 2007;22(6):446-452. Published online December 1, 2007; DOI: https://doi.org/10.3803/jkes.2007.22.6.446

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Abstract PDF: Osteogenesis imperfecta (OI) is a genetic disease that is caused by a synthetic anomaly of type I collagen. It is characterized by such features as low bone density, multiple fractures, bone deformities and chronic bone pain. According to the hereditary pattern and degree of phenotypical expression, it also has various extraskeletal manifestations such as blue sclera, hearing deformities and dentinogenesis imperfecta. Recently, an expanded seven subgroup classification of OI has been suggested by means of its clinical severity and mutational characteristics. However, most of the OI cases reported in Korea have been classified as type II or III that can be diagnosed easily and present with severe clinical manifestations. Only rare type I OI cases have been currently reported in Korea. Herein, we report a case of type I OI that was differentially diagnosed as a cause of a spinal compression fracture.

A Case of Osteomalacia Caused by Severe Vitamin D Deficiency.: Seok Yeon Kim, Sang Youl Rhee, Soo Young Moon, Suk Chon, In Kyung Jeong, Seungjoon Oh, Kyu Jeung Ahn, Deog Yoon Kim, Ho Yeon Chung, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Jeong Taek Woo; J Korean Endocr Soc. 2007;22(1):55-61. Published online February 1, 2007; DOI: https://doi.org/10.3803/jkes.2007.22.1.55

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Vitamin D is a kind of hormone that can be synthesized in the skin or it is supplied in the diet it is involved in a central role in bone and calcium homeostasis in vivo. Metabolic bone diseases such as rickets in children and osteomalacia in adults can also be caused by deficiency or metabolic defects in the vitamin D hormone related system. However, there has been a lack of generalized epidemiologic studies about the vitamin D deficiency status in Koreans. We recently experienced a case of osteomalacia caused by severe vitamin D deficiency. These kinds of case have not been reported elsewhere in Korea for the last twenty years.

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A Case of Nutritional Osteomalacia in Young Adult Male
Choong-Kyun Noh, Min-Jeong Lee, Bu Kyung Kim, Yoon-Sok Chung
Journal of Bone Metabolism.2013; 20(1): 51. CrossRef

A Case of Cushing's Disease due to Pituitary Microadenoma Combined with Primary Empty Sella Syndrome.: Yun Jung Lee, Sangyoul Rhee, Suk Chon, Seungjoon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Byung Wook Lee, Jung Won Jeon; J Korean Endocr Soc. 2006;21(6):567-571. Published online December 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.6.567

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Abstract PDF: An empty sella is defined as a sella which, regardless of its size, is completely or partly filled with cerebrospinal fluid. The endocrine function of primary empty sella syndrome is usually normal, but sometimes this syndrome is associated with complete or partial pituitary insufficiency and rarely hypersecretion of pituitary hormone. Primary empty sella syndrome combined with Cushing's disease has rarely been reported. A 45-years-old woman presented with cushingoid feature. Her urinary cortisol and 17-hydroxycorticosteroid excretion were increased. The results of endocrine function testing were suggestive of Cushing's disease. Sella MRI showed of partially empty sella and pituitary microadenoma. The pituitary microadenoma was removed by the trans-sphenoidal approach. We report here on this case together with a review of the literature.

Glucose Regulated Production of Human Insulin in Genetically Modified Myoblast Cell Line (C2C12).: Seungjoon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim; J Korean Endocr Soc. 2006;21(6):526-535. Published online December 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.6.526

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Abstract PDF: BACKGROUND
To develop somatic gene therapy model for diabetes mellitus, it is the most important to control it by glucose concentration. In order to develop the myoblasts that produce insulin by glucose concentration, the transfection of genes of human insulin, rat glucokinase and rat GLUT2 was conducted using C2C12, the murine myoblast cell line. METHODS: pMLC-hINSmut plasmid vector to which human insulin cDNA was inserted in C2C12 cell line, pCB7/GLUT2 and pCB7/GK to which GLUT2 and glucokinase were inserted. Based on the inserted gene, C2C12/INS-GLUT2, C2C12/INS-GK and C2C12/INS-GK-GLUT2 were prepared. In each cell line, its mRNA and protein expression were measured. Also, the capability of producing insulin in low glucose (2.7 mM) and high glucose (25 mM) were compared. RESULTS: 1. It was observed that C2C12/INS-GLUT2, C2C12/INS-GK, C2C12/INS-GK-GLUT2 cell line expressed mRNA and protein of transfected genes, respectively. 2. As for the insulin production depending on the glucose concentration in C2C12/INS, it slightly increased from 0.049 +/- 0.003 micro U/10(6) cells/hr to 0.197 +/- 0.022 micro U/10(6) cells/hr. However, in C2C12/GK-GLUT2-INS, it showed the most evident increase: from 0.251 +/- 0.074 micro U/10(6) cells/hr to 1.325 +/- 0.221 micro U/10(6) cells/hr. 3. The expression of insulin gene decreased in proportion to the insulin production capability, reaching the minimum point at the 8th week. CONCLUSION: Genetically engineered murine myoblast secreted insulin depending on the glucose concentration in vitro and was able to cause its decrement when transplanted. However, it should be continued to study the method to maintain the consistent genetic expression in somatic cell therapy.

Clinical Usefulness of Glucose Testing from the Forearm in Diabetic Patients.: Sang Wook Lee, Suk Chon, Seungjoon Oh, Jeong taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Jeong Ryung Paeng, Gwanpyo Koh, Hak Hyun Nam; J Korean Endocr Soc. 2006;21(4):281-289. Published online August 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.4.281

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BACKGROUND
Self monitoring of blood glucose plays an important role in the management of diabetes. However, traditional finger prick testing causes pain and so compliance with self monitoring of blood glucose is usually poor. Using an alternative site for sampling may reduce the level of pain and be beneficial for improving the compliance of diabetic patients. We evaluated the accuracy and acceptability of blood glucose testing from the forearm by analyzing the performance of the CareSens(R) (i-Sens, Inc. Korea) device for diabetic patients. METHODS: We measured the glucose level at the forearm by use of CareLance(R) (vaccum assisted lancing device) and also at the finger tip simultaneously by use of the CareSens(R) device at fasting and postprandial 2 hours, respectively. At the same time, the glucose levels of venous samples were checked by the laboratory method (BIOSEN 5030, EKF, Germany) and compared with those glucose level measured by the CareSens(R) device. We also checked the ease of use of the CareLance(R) and the associated pain of the patients by means of a visual analogue scale (VAS) at the time of blood sampling. RESULTS: The glucose level obtained from the forearm and finger tip correlated well with that from the laboratory method, respectively. Error grid analysis showed that 100% of the measurements were clinically acceptable; forearm blood glucose testing by use of CareLance(R) was less painful and it was as easy to use as the finger prick (P < 0.05 and P = 0.04, respectively). CONCLUSION: Forearm testing is an acceptable alternative to finger prick testing for measuring blood glucose in diabetic patients.

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Accuracy Evaluation of the Alternative Site Blood Glucose Test Using Error Grid
Kyung-Soon Park, Eun-Jong Cha
Journal of Biomedical Engineering Research.2011; 32(1): 25. CrossRef

A Case of Malignant Insulinoma Metastasized to Liver after Partial Pancreatectomy due to Insulinoma 10 Years before.: Yang Il Kang, Byung Hyuk Yang, Suk Chon, Seungjoon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Ju Hie Lee, Kwanpyo Koh; J Korean Endocr Soc. 2006;21(1):68-73. Published online February 1, 2006; DOI: https://doi.org/10.3803/jkes.2006.21.1.68

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Abstract PDF: Malignant insulinomas are very rare endocrine tumours with a variable clinical course. Here, a case of a malignant insulinoma, resected from the tail of the pancreas 10 years previously, which was found to have hepatic metastasis, is reported. A pancreatic mass, without evidence of metastasis, has been found using an abdominal CT scan and intra-operative ultrasonography 10 years previously. Recently, the patient has suffered from dizziness, sweating and an altered mentality. Hyperinsulinemia was diagnosed from the biochemical laboratory finding. An abdominal CT scan and intra-operative abdominal sonography showed multiple hepatic metastasis, without local recurrence in pancreas. Therefore, a partial hepatic segmentectomy was performed. Immunohistochemical staining of the postoperative specimen was strongly positive for insulin. The postoperative biochemical response was normalized, and the patient experienced no further hypoglycemic symptom.

A Case Of Transient Hyporeninemic Hypoaldosteronism After Unilateral Adrenalrectomy for Aldosterone-Producing Adenoma.: Jungho Suh, Gwanpyo Koh, Keun Yong Park, Jongwook Hong, Suk Chon, Seungjoon Oh, Jeong taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim; J Korean Endocr Soc. 2005;20(5):502-506. Published online October 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.5.502

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Abstract PDF

Primary aldosteronism is due to either a unilateral adrenal adenoma or bilateral hyperplasia of the adrenal cortex in most cases. A unilateral adrenalectomy in hypertensive and hypokalemic patients, with a well-documented adrenal adenoma, is usually followed by the correction of hypokalemia in all subjects, with the cure of hypertension in 60 to 87% of patients. Here, a unique case, in which a unilateral adrenalectomy for the removal of an adrenal adenoma was followed by severe hyperkalemia, low levels of plasma renin activity and serum aldosterone, suggestive of chronic suppression of the renin-aldosterone axis, is reported. In a follow-up Lasix stimulation test on the 70th day after surgery, the suppression of the renin-aldosterone axis was resolved, indicating the suppression was transient. Patients undergoing a unilateral adrenalectomy for an aldosterone-producing adenoma should be closely followed up to avoid severe hyperkalemia.

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A Case of Persistent Hyperkalemia After Unilateral Adrenalectomy for Aldosterone-Producing Adenoma
Min Jae Yang, Seung Jin Han, Min Seok Lee, Eun Kyung Kim, Hae Jin Kim, Dae Jung Kim, Yoon Sok Chung, Tae Hee Lee, Jang Hee Kim, Kwan Woo Lee
Journal of Korean Endocrine Society.2009; 24(3): 201. CrossRef

A Case of Thyroid Abscess Associated with Lymphocytic Thyroidits.: Hyoun Jung Chin, Mi Kwang Kwon, Yeehuung Kim, Gwanpyo Koh, Keun Yong Park, Suk Chon, Seungjoon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Moon Ho Yang; J Korean Endocr Soc. 2005;20(4):385-389. Published online August 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.4.385

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A Case of 45,X Turner's Syndrome with Iron Deficiency Anemia due to Menometrorrhagia and Spontaneous Sexual Development.: Mi Kwang Kwon, Suk Chon, Gwan Pyo Koh, Seung Jun Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim; J Korean Endocr Soc. 2005;20(2):160-167. Published online April 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.2.160

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Abstract PDF

Short stature and gonadal dysgenesis are two characteristic clinical features of Turners syndrome. Very rarely, patients with Turners syndrome may menstruate and even be fertile. We experienced a case of Turners syndrome with spontaneous sexual development and menstruation. A 16-year-old girl was referred for severe anemia and menometrorrahgia. She had nearly normal features, with the exception of a short stature and a single right kidney. Also, she had spontaneous development of secondary sexual characteristics. We performed and anemia study and evaluated her short stature. In chromosomal study of her bone marrow and peripheral blood lymphocytes, she was revealed to have monosomy 45,X. Herein, this case is reported, with a brief review of literature

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Spontaneous Sexual Development and Heavy Menstrual Bleeding in 45,X Monosomy and 45,X/47,XXX Mosaic Turner Syndrome and a Review of the Literature
Myeong Jin Kim, Hwal Rim Jeong
Journal of Pediatric and Adolescent Gynecology.2020; 33(5): 602. CrossRef

Mutational Analysis of Gsalpha Protein in Fibrous dysplasia of the Bone.: Sang Youl Rhee, Jeong Taek Woo, Gwanpyo Koh, Seungjoon Oh, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Yong Koo Park; J Korean Endocr Soc. 2005;20(2):142-147. Published online April 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.2.142

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Abstract PDF: BACKGROUND
Fibrous dysplasia of the bone(FD) is a benign fibrous bone lesion which usually involves the long bones of the extremities. FD may be asymptomatic, but often leads to bone deformity and pathological fracture. The disease is caused by a somatic mutation in the Gsalpha protein, which is responsible for intracellular signal transduction. METHODS: Mutations in the GNAS1 gene, which codes for Gsalpha protein, was investigated in 34 patients with monostotic and polyostotic FD and McCune-Albright syndrome. DNA was extracted from formalin-fixed, paraffin embedded bone tissues, and exons 8 and 9 of the GNAS1 gene amplified using a polymerase chain reaction(PCR). Subsequently, plasmid cloning and DNA sequencing analysis were performed. RESULTS: The PCR was successfully performed in 5 patients with monostotic FD. However, the sequencing analysis failed to identify any significant point mutations in exons 8 or 9 of GNAS1. Nevertheless, 3 point mutations were observed in the intron of the GNAS1 gene in 2 samples. CONCLUSION: In addition to the previously known somatic mutations of the GNAS1 gene, this study suggests that fibrous dysplasia of the bone might be associated with another point mutations of the GNAS1 gene

The One Year Effects of Growth Hormone Replacement on the Body Composition in the Normal Adults.: Eui Hyun Kim, Suk Chon, Kwan Pyo Koh, Seong Joon Oh, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim; J Korean Endocr Soc. 2004;19(4):303-319. Published online August 1, 2004

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Abstract PDF: BACKGROUND
The secretion of growth hormone [GH] declines by 14.4% every decade, leading to the suggestion that the elderly are functionally GH deficient, which may increase adipose tissue and decrease the bone mass and density, as well as other negative changes in body composition. Recently, many studies have shown that GH replacement therapy may restore the changes that occur in the body composition with aging. AIM: The GH and insulin like growth factor-I[IGF-I] profiles were identified during GH replacement therapy in the elderly and compared with those of GH deficient[GHD] patients. The metabolic effects of GH replacement on the body composition of the elderly was also investigated, especially the body fat, muscle and bone parameters. Subjects and METHODS: 98 healthy normal out-patients and 13 GHD patients, who had peak GH concentrations less than 5 ng/mL after an insulin tolerance test [ITT] or growth hormone releasing hormone [GHRH] stimulation test, were the subjects of this study. All were receiving appropriate thyroid, adrenal and gonadal hormone replacements. The dose of recombinant human GH [rhGH] was 0.02~0.04 mg [0.06~0.12 IU]/kg of body weight.per week, given nightly by a subcutaneous injection, six times a week, over a 52 week period. The GH was measures after the ITT and GHRH stimulation tests, and the IGF-1, lipid parameters [total cholesterol, triglyceride, HDL-, and LDL cholesterol], visceral adipose tissue [VAT], subcutaneous adipose tissue [SAT], VAT/SAT ratio, quadriceps muscle area, total body fat, total bone mineral density [BMD], alkaline phosphatase [ALP], osteocalcin and urine deoxypyridinoline [DYP], as well as anthropometry, were also assessed. RESULTS: All the anthropometry features between the normal and GHD subjects were very similar. The hormonal profiles were checked; the GH peaks of the ITT and GHRH stimulation tests were significantly higher in the normal compared to the GHD patients, but the GHRH test showed lower GH peaks in than those of the ITT test in the normal subjects. The IGF-I levels after GH replacement were constantly maintained in the normal and GHD groups after 3 week and until the 52nd week. According to the lipid profiles, the GHD group showed significantly decreased total cholesterol and LDL-cholesterol after 12 weeks of GH replacement. The normal male group revealed constantly increased triglyceride levels during the entire 52 weeks of GH replacement, but thr other lipid parameters remained completely unchanged. The normal female group showed no change in any of their lipid parameters. Although the amounts of VAT at the baseline were the same in all groups, only the normal males showed effective visceral fat removal, with significantly reduced VAT after 52 weeks of GH treatment. In the normal female and GHD groups the bone mineral density had a V shaped curve after GH replacement, and the ALP and osteocalcin levels were significantly increased after 26 weeks of GH therapy in the GHD group. CONCLUSION: The body compositions in the normal male, female and GHD groups were similar before the GH replacement therapy, and the serum IGF-I levels were well maintained in all these groups during GH replacement. Although the majority of aging symptoms were improved, the body compositions tended to return to their original stati in the normal groups. GH replacement is recommended in the elderly for better health and well-being

Response to the Combined Pituitary Stimulation Test by CRH, GHRH, GnRH and TRH in Normal Human According to Age and Gender.: Sanghoon Lee, Sung Woon Kim, Gwanpyo Ko, Seungjoon Oh, Jeong taek Woo, Inmyung Yang, Jin Woo Kim, Young Seol Kim; J Korean Endocr Soc. 2004;19(1):24-32. Published online February 1, 2004

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Abstract PDF: BACKGROUND
It has been already known that each trophic hormone in combined pituitary responsiveness according to gender and age brings about variable response, but in Korea, there has been no actual data. In this study, in order to assess the pituitary responsiveness, a combined pituitary stimulation test was performed in Korean subjects with the variation in CRH, GHRH, GnRH, and TRH according to their age and gender. Were these the variables that were changed according to age and gender? Clarify that. Also, it might be good to write out the abbreviations.) METHOD: Fourteen physically and mentally healthy male subjects and fourteen female subjects, also physically and mentally healthy, underwent the combined anterior pituitary stimulation test by CRH, GHRH, LHRH, and TRH. Each gender group was divided further into young(meanSE; male: 231, female: 221) and old (mean; male: 513, female: 522) groups. RESULTS: There were significant differences between the gender and age groups. The Peak GH level and maximal GH increment were significantly increased in young men compared to old men. The Peak ACTH level and maximal ACTH increment were significantly increased in old men as opposed to young men. The Peak PRL level, maximal PRL increment, Peak TSH level, and maximal TSH increment were significantly increased in old women compared to old men. The Peak FSH level was significantly increased in the two old groups compared to the young groups, which showedindependence in gender, and the maximal FSH increment was significantly increased in old men when compared with the young men. CONCLUSION: These results show that in order to for accurate interpretation of the response from the combined pituitary stimulation test, it is necessary to consider age and gender of the subjects. We suggest response values of the combined pituitary stimulation test in terms of age and gender in healthy Korean subjects.

A Case of Cystic Parathyroid Adenoma Presenting as Severe Bony Lesion.: Suk Chon, Young Hee Kim, Ji Young Park, Kwan Pyo Ko, Cheol Young Park, Deog Yoon Kim, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Suck Hwan Go; J Korean Endocr Soc. 2003;18(2):214-220. Published online April 1, 2003

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Abstract PDF: A cystic parathyroid adenoma is rare. A case of primary hyperparathyroidism, with the cystic formation of a parathyroid adenoma and a severe bony lesion, is reported. A 52-year-old male was admitted due to pain in both hips and for evaluation of hypercalcemia. The plasma level of the intact parathyroid hormone(iPTH) was elevated to 1424pg/mL. Ultrasonography and the computed tomography revealed a parathyroid cyst on the left thyroid lower pole. Parathyroid scintigraphy detected a parathyroid adenoma. A radiograph showed a subperiosteal bone resorption on the phalanges, and a brown tumor(osteitis fibrosa cystica) on the femur shaft was noted. A surgical excision of the parathyroid adenoma was performed. The PTH level in the cystic fluid was increased. A histological examination confirmed a cystic parathyroid adenoma. The PTH level was normalized after the operation.

Gene Expression of the Somatostatin Receptors, Gi2 alpha and Pit-1 alpha in GH3 Cells Permanently Transfected with a Mutant Gs alpha Gene.: Cheol young Park, In myung Yang, Eun hee Kim, Sook jin Sohn, Mee sook Ryu, Jeong taek Woo, Sung woon Kim, Jin woo Kim, Young seol Kim, Young kil Choi, Seung joon Park; J Korean Endocr Soc. 2002;17(2):170-182. Published online April 1, 2002

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Abstract PDF: BACKGROUND
Cyclic AMP stimulates the expression of the somatostatin (SRIF) receptor (sst1-5) and human growth hormone (GH)-secreting pituitary tumors with the gsp oncogene which increases intracellular cAMP levels, and shows a good inhibitory response of the GH to SRIF. Taken together, we hypothesized that the gsp oncogene may increase the SRIF receptor expression or and factors related to the postreceptor signal transduction of the SRIF, in order to enhance its responsiveness to SRIF. To test this hypothesis, we investigated if the gsp oncogene could increase the sst1, sst2, Gi2 alpha, and pit-1 alpha gene expression in GH3 cells. METHODS: GH3 cells were permanently transfected with the plasmid expressing Gs alpha gene, where the arginine of codon 201 was replaced with histidine. Intracellular cAMP levels and GH concentrations were measured by radioimmunoassays. Gene expressions of the sst1, sst2, Gi2 alpha, and pit-1 alpha were determined by RT-PCR. RESULTS: Intracellular cAMP levels and medium GH release were increased by 1.7 and 2.7-fold in GH3 cells expressing the gsp oncogene, respectively. In GH3 cells expressing the gsp oncogene, the sst1 mRNA levels were decreased, whereas those of the sst2, Gi2 alpha and pit-1 alpha mRNA were increased. A 4-h forskolin (10 M) stimulation remarkably increased the sst1 and sst2 mRNA levels in GH3 cells expressing wild and mutant Gs alpha . However, forskolin did not affect the Gi2 alpha and pit-1 alpha mRNA levels. In contrast, SRIF (1 M, 2 h) decreased the sst2 mRNA levels only in GH3 cells expressing the gsp oncogene. CONCLUSION: These results suggest that higher expressions of sst2, Gi2 alpha, and pit-1 alpha, induced by the gsp oncogene may be a mechanism by which gsp-positive pituitary tumors show a greater response to SRIF. The discrepancy between these and in vivo results should be explored further.

Gene Expression of Somatostatin Receptor (Subtype 2 & 5), Gi2 alpha and Pit-1 in GH-secreting Pituitary Adenomas.: Mee sook Ryu, In myung Yang, Cheol young Park, Jeong taek Woo, Sung woon Kim, Jin Woo Kim, Young seoul Kim, Young kil Choi, En hee Kim, Seung joon Park, Kook gi Kim; J Korean Endocr Soc. 2002;17(2):158-169. Published online April 1, 2002

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Abstract PDF: BACKGROUND
Mutation of Gs protein subunit (gsp oncogene), detected in about 30~40% of growth hormone (GH)-secreting pituitary tumors, is associated with an increased long-acting somatostatin analog octreotide sensitivity. However, the mRNA expression of somatostatin receptor (sst) was not changed in the GH-secreting pituitary tumor, regardless of whether they were gsp oncogene positive or negative. This suggests that the expression of genes coding for Gi2 alpha , Pit-1 and the other factors involved in the regulation of secretory activity in somatotrophs is likely to be altered in gsp oncogene positive tumors. We observed the impact of the gsp oncogene on the expression of the genes coding for Gi2 alpha, Pit-1 and sst (2&5) in GH-secreting pituitary tumors. METHODS: The GH response to octreotide was examined in 13 acromegalic patients before transsphenoidal adenomectomy. Genomic DNA and RNA were extracted from fresh frozen tumor tissues. PCR was performed to amplify and sequence the region between codon 184 and 251 that includes exons 8 and 9 of the Gs gene. Sst2, sst5, Gi2 alpha and Pit-1 mRNA levels were measured by semi-quantitative RT-PCR. RESULTS: Sst2 and sst5 mRNA transcripts were detected in all tumors (7 gsp +, 6 gsp-). The amount of sst transcripts varied considerably varied between the tumors. There were no significant differences in sex, age, tumor size, grade or basal GH levels. Pit-1 and sst2 mRNA levels were not different. In contrast, Gi2 alpha mRNA levels were significantly higher in gsp (+) while sst5 mRNA levels were higher in gsp (-). CONCLUSION: These data suggests that gsp oncogene may increase Gi2 alpha levels but decrease sst5 mRNA levels. However, Pit-1 and sst2 mRNA expression may not be affected by gsp oncogene. The increased expression of the Gi2 alpha gene might be an inhibitory compensatory response to the action of gsp oncogene.

The Combined Pituitary Stimulation Test in Patients Suffered from Massive Postpartum Hemorrhage.: Sang Hwa Kim, In Myung Yang, Cheol Young Park, Seung Joon Oh, Deog Yoon Kim, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Sun Woo Kim, Young Kil Choi; J Korean Endocr Soc. 2001;16(1):39-53. Published online February 1, 2001

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Abstract PDF: BACKGROUND
ackground: Sheehan's syndrome secondary to severe postpartum hemorrhage is one of the major causes of pituitary insufficiency in Korea. Most of these patients do not manifest symptoms or signs of gross endocrinopathies. Earlier detection of pituitary insufficiency is of clinical importance. The combined pituitary stimulation test that uses the four hypothalamic releasing hormones is a rapid, safe, and effective way to evaluate anterior pituitary function. However, the criteria for a normal response has not been established in Korea. METHODS: Combined anterior pituitary stimulation tests were performed on fourteen healthy women who had no history of endocrine disease. Combined tests of anterior pituitary reserve were done no forty-five patients who suffered from massive postpartum hemorrhage which required transfusing, along with subsequent shock or changing consciousness and in thirty-nine patients who experienced mild postpartum hemorrhage. RESULTS: 1) In the severe hemorrhage group, thirty-three of forty-five women (73.3%) showed blunted responses in more than one of the anterior pituitary hormones in the combined pituitary stimulation tests. However, in the mild hemorrhage group, only eighteen of thirty-nine women (46.2%) demonstrated blunted responses of more than one of the anterior pituitary hormones. 2) In the severe hemorrhage group, the TSH response was blunted in twenty-five patients (55.6%), prolactin in eleven patients (24.4%), ACTH in ten patients (22.2%), LH in ten patients (22.2%), GH in nine patients (20%), and FSH in five patients (11.1%). 3) The results of combined pituitary stimulation tests in the normal control group were different from the results of other studies. CONCLUSION: It is recommended that the women who experienced a severe postpartum hemorrhage should be evaluated by using the combined pituitary stimulation test. Moreover, criteria for a normal response to the combined pituitary stimulation test should be established in Korea.

Effect of Acute Hyperglycemia - and Isoproterenol - induced Hypothalamic Somatostatin Release on the Thyroid Hormone Releasing Hormone - induced Thyroid Stimulating Hormone Secretion.: Cheol Young Park, In Myung Yang, Seung Joon Oh, Deog Yoon Kim, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi; J Korean Endocr Soc. 2000;15(4-5):486-492. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Acute hyperglycemia stimulates somatostatin (SRIH) release from the hypothalamus, and which in turn suppress growth hormone (GH) secretion and thyroid stimulating hormone (TSH) from the anterior pituitary gland. Beta-adrenergic pathway is known to stimulate the hypothalamus SRIH release. Recently, We demonstrated that isoproterenol, a beta-adrenergic agonist, had an additional suppressive effect on the suppression by glucose of GHRH-stimulated GH response. Therefore, the present study aimed to determine whether isoproterenol has an additional suppressive effect on the suppression by glucose of TRH-stimulated TSH response. METHODS: Seven healthy young men, aged 24 to 27 years, were studied. Four different TRH stimulation tests were carried out. (Test 1) TRH (Hoechst AG, Germany), 200 microgram bolus, was given intravenously at 0 minute. (Test 2) Glucose, 100 g, was given orally 30 min before TRH administration. (Test 3) Isoproterenol(Isuprel, Sanofi Winthrop, USA), 0.012 pg/kg, was infused continuously for 120 min after TRH administration. (Test 4) After pretreatment with glucose as Test 2, isoproterenol and TRH were administered as Test 3. RESULTS: Oral glucose ingestion significantly suppressed the TRH-stimulated TSH secretion. Isoproterenol infusion significantly suppressed the TRH-stimulated TSH secretion. Glucose-induced suppression of the TSH response was significantly greater than that by isoproterenol. 1soproterenol infusion after glucose pretreatment did not show any additional suppressive effect on the glucose-induced suppression of TSH response to TRH. CONCLUSION: The results suggest that isoproterenol infusion in addition to glucose pretreatment before the TRH stimulation test is not necessary for the development of stronger stimulation test for the hypothalamic somatostatin secretion.

The Effect of Slow Release Lanreotide in Korean Acromegalic Ratients.: Sang Hwa Kim, In Myung Yang, Kwang Sik Seo, Eul Soon Im, Seung Joon Oh, Deog Yoon Kim, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Sun Woo Kim, Young Kil Choi; J Korean Endocr Soc. 1999;14(3):458-471. Published online January 1, 2001

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Abstract PDF: BACKGROUND
Previous studies have shown that somatostatin analogues such as octreotide are effective in suppressing GH and IGF-I levels in acromegaly. The recent availability of slow release lanreotide could avoid the inconveniences associated with either repeated subcutaneous injections or continuous infusions. We investigated the effects of the SR-lanreotide on clinical, biochemical and safety responses in five patients with acromegaly. And we investigated whether the response of the GH level to acute adrninistration of octreotide predicts the response after 12 weeks of treatment with the SR-lanreotide and whether the identification of gsp oncogene could be used as a therapeutic and prognostic clue in treatment with the SR-lanreotide. METHODS: We studied the effects of SR-lanreotide 30 mg administered intramuscularly biweekly for 12 weeks in five Korean acromegalic patients. Subjective improvements in the clinical symptoms of acromegaly and adverse reactions were recorded. During SR-lanreotide treatment, serum GH, IGF-I and IGFBP-3 concentrations were evaluated just before the next injection of the SR-lanreotide. Before the start of SR-lanreotide therapy the sensitivity of GH secretion to the octreotide was tested by measuring the effect of the acute response to 0.1 mg intravenously on plasma GH levels followed until 6 hours after administration of octreotide. Direct polymerase chain reaction sequencing of the gsp oncogene were performed. We compared the responses to SR-lanreotide in patients harboring gsp-positive and gsp-negative somatotroph adenomas. RESULTS: The treatment with SR-lanreotide for 12 weeks could suppress the GH level by more than 50% in four of five patients and normalize the IGF-I in two patients. No correlation was found between the GH level and IGF-I level at the end of the study. The IGFBP-3 level correlated with the IGF-I level in three of five patients. Although the initial GH response to octreotide tended to correlate with the IGF-I response after SR-lanreotide treatment, the results were statistically insignificant. The patients with gsp-positive tumor tended to show a better response to SR-lanreotide. During treatment, there was a reduction in the percentage of patients complaining of joint pain, fatigue, digital paresthesia, and hyperhydrosis. Changes in soft tissue swelling were documented by decreases in finger circumference. The common adverse events were abdominal discomfort, loose stool, and diarrhea. These events were decreased progressively. No patients discontinued the treatment of SR-lanreotide due to adverse events. CONCLUSION: This study showed that SR-lanreotide is effective in controlling acromegalic symptoms as well as GH and IGF-I hypersecretion. This treatment was well tolerated and more convenient for the patients. Further studies are required for clinical outcome of long-term SR-lanreotide treatment and cost-effective analysis.

Cytotoxic T Lymphocyte Antigen-4 (CTla-4) Polymorphism in Korean Autoimmune Thyroid Disease.: Dong Kuen Lee, Young Seol Kim, Jeong Taek Woo, Sung Woon Kim, In Myung Yang, Jin Woo Kim, Young Kil Choi, Jeong Ryung Paeng; J Korean Endocr Soc. 1999;14(1):40-52. Published online January 1, 2001

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Abstract PDF: BACKGROUND
The cause of autoimmune thyroid diseases (AITD), including Graves disease and Hashimotos thyroiditis, is largely unknown. To identify the genes responsible, most attention has been focussed on the HLA regions in the early studies. However, these studies have repeatedly shown a weak association between AITD and the HLA-DR3 in Caucasians. To understand and find out the mechanisms underlying the development of AITD, a search for non-HLA linked susceptibility genes is important. A recent study from American population have indicated an association between a polymorphism of CILA-4 gene and Graves disease. To clarify the relationship of the CTLA-4 polymorphism and AITD, the allele frequency of CTLA-4 gene from the patients with Graves disease and with Hashimotos thyroiditis in Korean papulation were analysed. METHODS: The CTLA-4 exon 1 polymorphism (49, A/G) was analysed by PCR-based, RFLP (Restriction Fragment Length Polymorphism) from 92 women and 37 men with Graves disease and 50 women and 9 men with Hashimotos thyroiditis diagnosed. Also, 287 healthy controls including 155 women and 132 men with no clinical evidence or family history of thyroid disease were enrolled. RESULTS: 1) In the group of Graves disease, there was significantly more patients with alanine homozygote (GG) than in control group (P<0.0005, RR=1.40). However, there was not significant with threonine homozygote (AA) between two groups (P=0.052). In the group of Hashimotos thyroiditis, no significant differences were found between all homozygotes and heterozygote. 2) In the group of Graves disease, there were significantly more patients with alanine homozygote (GG) (P<0.0001, RR=1.85) and significantly fewer patients with threonine homozygote (AA) than in the group of Hashimoto's thyroiditis (P<0.005, RR 0.25). CONCLUSION: Regardless of sex difference, alanine homozygote (GG) at exon 1 (codon 17) of CTLA-4 is associated with Graves disease in Korean population, which suggests genetic susceptibility is some role in the pathogenesis of Graves disease.

Expression of TRH Receptor Gene in GH-Secreting Piruitary Adenomas.: In Myung Yang, Seung Joon Park, Jeong Wha Ryu, Joo Ho Chung, Mee Sook Ryu, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi; J Korean Endocr Soc. 1997;12(3):349-356. Published online January 1, 2001

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Abstract PDF: Background
To test the hypothesis that Galphas gene mutation may suppress the expression of TRH-R gene, we investigated whether hTRH-R gene expression is lower in human GH-secreting pituitary adenomas with Galphas mutation than in tumors without the mutation. Method: TRH-induced paradoxical response of GH was observed in 8 acromegalic patients. The mutation of gene was identified by direct sequencing of the genomic DNA prepared from GH-secreting pituitary adenomas. The expression of hTRHT mRNA was quantitated by RT-PCR. Results: The transcript of hTRH-R gene was detected in 6 of 8(75%) tumors. Three of these(50%) showed the paradoxical GH response to TRH and the other three patients did not show the response. The relative expression of hTRH-R mRNA in the tumors from patients with the paradoxical response of GH to TRH did not differ from that in the tumors from patients without the paradoxical response. Direct PCR sequencing of Galphas disclosed a mutant allele and a normal allele only at codon 201 in 4 of 8 tumors. The paradoxical response to TRH was observed in 2 of 4 patients without the mutation, and 2 of 4 patients with the mutation. The hTRH-R gene expression of pituitary adenomas did not differ between the tumors without the mutation and those with mutation. Conclusion: This study suggests that the expression of TRH-R gene is not likely to be a main determinant for the paradoxical response of GH to TRH, and that Galphas mutation does not seem to suppress the gene expression of TRH-R in GH secreting adenoma.

A Case of Multiple endocrine neoplasia type 2a.: Seung Jae Hong, In Myung Yang, Jeong Taek Woo, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Yong Sun Yun, Chung Hwan Lee, Seong Ho Lee, Deok Yoon Kim, Sung Weon Kim; J Korean Endocr Soc. 1997;12(2):328-337. Published online January 1, 2001

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Abstract PDF: Multiple endocrine neoplasia type2a (MEN type2a) is a dominantly inherited cancer syndrome which is characterized by medullary thyroid carcinoma, pheochromocytoma and parathyroid hyperplasia or adenoma. Recent reports show that DNA analysis will be introduced into screening of MEN type2a families. Regular prospective screening and appropriate surgical intervention can reduce the morbidity and mortality due to MEN type2a. We experienced a case of MEN type 2a in a 46-year-old female patient. She had undergone bilateral adrenalectomy due to pheochromocytoma, followed by a total radical thyroidectomy, which revealed medullary thyroid carcinoma of the both thyroid gland and parathyroid hyperplasia.

A Study of Point Mutations of Human Insulin-like Growth Factor - 1 (IGF - 1) Promoter Gene in Familial Short Stature (FSS) Patients.: In Myung Yang, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Hyun Ha Chang, In Kyung Jung, Tae Kwan Park; J Korean Endocr Soc. 1996;11(4):500-509. Published online November 7, 2019

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Abstract PDF: Background
FSS is a normal variants in Korea, but some of them had defect of noctumal GH pulse i.e. neurosecretory dysfunction. Although Korean children had strikingly got higher final height in the last decade. We are interested in what kinds of differences were existed in FSS group. Previous study showed theres no difference of GH related biochemical markers between normal and FSS group, like IGF-I, IGFBP-3 etc. We analyzed molecular difference in FSS group. Methods: We screened 23 FSS patients and 16 normal controls to IGF-I gene prornoter region with PCR-SSCP (single strand conformation polymorphisrn) method and sequenced 1 FSS patients who had abnormal SSCP band. Results: We found 1 out of 23 patients with abnormal SSCP band (none for 16 controls). Their IGF-I promoter gene were sequenced with modified Maxam-Gilbert method. One subject had 2 point mutations(+8 and +74). Conclusion: We found point mutations of IGF-I promoter in FSS group, This position was regarded as HNF(hepatic nuclear factor)-3 binding sites. We needed more study for the detection of its biological function according io linear growth with in vivo and in vitro study.

Expression of Exon 1 and 6 of Indulin-like Growth Factor - 1 (IGF - 1) Gene in Thyroid Tissues.: Sung Woon Kim, Hyun Ha Chang, In Kyung Jung, Jeong Taek Woo, In Myung Yang, Jin Woo Kim, Soung Seol Kim, Young Kil Choi; J Korean Endocr Soc. 1996;11(4):409-417. Published online November 7, 2019

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Abstract PDF: Background
Goiter has been a common problem in the thyroid disease. The exact mechanism of goiter had not been clarified yet, but some goiters were increased with TSH(thyrotropin releasing hormone) dependent manner. TSH might be a major influencing factor for increasing size of goiter(goitrogen) and theres many cofactors those influenced to goiter size. One of the rnost prominent growth factor as a goitrogen is a IGF-I(insulin-like growth factor-I). IGF-I play a great role as a cofactor of goitrogen with TSH. This study, therefore, is aimed to investigate intracellular activation of IGF-I gene promoter in the surgical specimens of thyroid tumor. Methods: We used surgical specimen of various thyroid tissues from normal to malignant along its cell nature. Actually we used normal liver tissue as a IGF-I control tissue, normal thyroid, benign adenoma, and papillary thyroid cancer tissue with its malignat nature. We checked Mrna expression of whole IGF-I and IGF-I exon 6 by Northern blot method, and IGF-I, promoter 1 expression by RT-PCR-transcription method. Autoradiographied signals were analysed with densitometer. Results: We found whole IGF-I mRNAs were expressed with alternate splicing in exon 1, 2 and exon 4, 5 respectively. Striking events of IGF-I transcription were multiple tranascription initiatian in Pl and P2, and 3 sites for polyadenylation in exon 6. Four or more Mrna bands in Northern blot analysis of IGF-I(0.8, 1.4, 4.2, and 7.8kb) were noted. In low molecular weight IGF-I Mrna did not change their signal intensity with tissues, but exan 6(7.8kb) signals were significantly increased to its hepatic expression levels in malignant tissue. IGF-I, exon 1 expression by RT-PCR-T7 transcription was strikingly increased in thyroid cancer tissue, but exon 6 expression was not a great expession. Conclusion: One possible guess for this expression discrepancy of each exon may be originated from different Mrna degradation of each IGF-I signals. We need more preeise experiment for Mrna degradation speed of IGF-I.

Increased Somatostatinergic Activity Induced by Acute Hyperglycemia is Not Mediated by Stimulation of the Beta-adrenergic System.: Seung Jae Hong, In Myung Yang, Gyu Choon Lee, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Soung Seol Kim, Young Kil Choi; J Korean Endocr Soc. 1996;11(4):383-390. Published online November 7, 2019

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Abstract PDF: No abstract available.

Insulin Like Growth Factor-I and Insulin Like Growth Factor Binding Protein-3 in Human Thyroid Cystic Fluids.: In Myung Yang, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Byoung Joon Kim, Seung Joon Oh; J Korean Endocr Soc. 1995;10(4):395-404. Published online November 7, 2019

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Abstract PDF: In the thyroid tissue, thyrotrophin(TSH) and IGF-I played major role of the goitrogen. But the evidences and precise mechanism of these two factors were not known so much. Actually local secretion of thyroid IGF-I was originated from its fibroblasts mainly. We guessed major roles of IGFs in the thyroid tissue were local paracrine effect of thyroid cells proliferation and differentiation which concert with TSH. Recently, some reporters described the source of thyroid IGF-I were partly from thyroid follicular cells and its action were synergistic with TSH. We measured TSH, IGF-I and IGFBP-3 from sera and thyroid cystic fluids in 36 patients with simple thyroid cyst and examined into correlation between TSH, IGF-I and IGFBP-3.1) According to cyst/serum TSH ratio, we classified two groups(Group I; c/s TSH <1, n=19. Group II; c/s TSH >1, n=17). This classification criteria means that cystic TSH level were increased than that of serum or not.2) The serum TSH, IGF-I and IGFBP-3 levels are not difference between group I and II.3) Cystic TSH were dependent on the serum TSH in Group I, but negative correlation in Group II. In Group II, cystic TSH was significant increased.4) Serum IGF-I were positive correlation in each Group5) In Group II, cystic IGF-I was not exceed than those of serum IGF-I, but some cystic IGFBP-3 were more increased than those of serum.6) In Group II, cystic IGFBP-3 increased than serum TSH, and cystic IGFBP-3 was positive correlation with cystic TSH and cystic IGF-I.As these data suggested that cystic TSH and cystic IGF-I levels may influence cystic IGFBP-3 level. The main effect for maintenance of cyst was mediated by cystic TSH and cystic IGFBP-3. But the cystic IGFBP-3 has major role for thyroid cyst than cyst TSH.

Identification of TPA - Response Element (TRE) in the Rat Thyrotropin - Releasing Hormone (TRH) Gene.: Woon Won Jung, Young Kil Choi, In Myung Yang, Kwang Sik Seo, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Seung Joon Park; J Korean Endocr Soc. 1994;10(3):200-213. Published online November 6, 2019

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Abstract PDF: There are two potential imperfect copies of the TRE consensus sequence between -47 and -113bp position on 5' upstream of the rat TRH gene. The upstream element(5'-TGcCgTCA-3') is located between -101 bp and -94 bp, and the downstream element(5'-TGAcCTCA-3') is positioned between -59bp and -52bp relative to the stranscription start site. The downstream variant differs from the consensus sequence of TRE(AP-1)(5'-TGACTCA-3'), by addition of one nucleotide. As there is no direct evidence that TPA stimulates the transcription of rat TRH gene, and there is no study to define TRE of the rat TRH gene, we performed Northern blot assay, transient gene expression study and gel shift assay to identify TRE. TRH mRNA expression of CA77 cells was increased about 2-2.5 fold 30 min after TPA stimulation. When PC12 cells were stimulated by TPA after transfection of the plasmids containing serially deleted 5'upstream of the rat TRH gene ligated to luciferase gene, the transcription of luciferase gene was increased more than 3.2 fold with the plasmid pTRH(-600/84)Luc and pTRH(-113/84)Luc. However, the transcriptional activation was remarkably decreased less than 1.6 fold with pTRH(-77/84)Luc, pTRH(-47/84)Luc, and pTRH(6/84)Luc. The plasmid containing the sequence of -108/-79 did not show any significant activation in both of basal and TPA-stimulated transcription, whereas the plasmid containing the sequence of -70/-41 showed a slight but significant transcriptional activation by TPA. The plasmid containing the sequence of -114/-47 showed remarkable increase in basal transcription and TPA induced transcription of luciferase gene. Gel shift assay revealed that the oligonucleotides spanning -108/-79 and -70/-41 bound to c-Jun, whereas the oligonucleotides spanning -40/1, 1/30, 31/60, 61/84 did not bind. The oligonucleotide of -70/-41 bound to c-Jun with higher affinity compared to that of -108/-79. The one base pair mutant of -70/-41(deletion of C from the middle of TGACCTCA) bound to c-Jun with higher affinity, whereas the one base pair replaced mutant(C to G) bound with lower affinity compared to the wild type oligonucleotide. These results suggest that the rat TRH gene expression is stimulated by TPA to a smaller degree compared to that of other genes, and the two elements act cooperatively as TRE. The downstream TRE variant is mainly responsible for TPA response and c-Jun binding, and the upstream variant play a permissive role for transcriptional activation. The addition of one nucleotide C in the downstream element may be responsible for the relatively lower response of the rat TRH gene to TPA.

Changes of Bone Turnover Markers after Treatment with Growth Hormone Therapy in Children with Growth Retardation.: In Myung Yang, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Ki Oak han, Duk Yoon Kim, Hyung In Yang; J Korean Endocr Soc. 1994;9(4):344-349. Published online November 6, 2019

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Abstract PDF: The effects of growth hormone(GH) deficiency and recombinant human GH replacement(0.5IU/kg per week) on bone mineral metabolism in 21GH-deficiency children were studied. All children had significantly reduction of bone density(Z score;-1.4+-0.71). After 1 month of therapy, the levels of serum insulin-like growth factor 1(IGF-1), osteocalcin(OC) and carboxyterminal propeptede of type 1 procollagen(PICP) were significantly elevated. But IGFBP-3 were not shown to change significantly. The changes in serum levels of PICP during the first month of recombinant human GH treatment were positively related to growth velocity, whereas the changes in IGF-1 and OC during the first month of therapy were not. We conclude that the recombinant human GH treatment caused significant modifications of mineral metablism and that the measurement of the changes of biochemical markers of bone metablism espacially PICP may be a useful tool in prediction improved growth velocity during long term GH replacement therpy.

The Responses of Pituitary Hormones to the Combined Pituitary Stimulation Test in Hypogonadotropic Hypogonadism.: In Myung Yang, Jeong Taek Woo, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Young Kil Choi, Eun Kyung Park, Kyu Jeong Ahn; J Korean Endocr Soc. 1994;9(2):93-107. Published online November 6, 2019

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Abstract PDF: To classify the causes of hypogonadotropic hypogonadism in Korean patients, and to improve the endocrinologic evaluation for the disease, we retrospectively studied the clinical findings and result of combined pituitary stimulation test in 35 patients with hypogonadotropic hypogonadism. The following results were obtained.1) The ratio of male to female was 1.3:1, and the 50% of male patients was under 20 years of age and the 20% of female patients in 30th decades. 2) The chief complaints of male patients on the admission were the failure of secondary sexual characteristics(95.0%) and loss of hair(5.0%), those of female patients were amenorrhea(46.7%), infertility(26.7%), failure of secondary characteristics(13.3%) and loss of hair(13.3%). 3) The causes of male hypogonadotropic hypogonadism were craniopharyngioma(35.0%), idiopathic(30.0%), Kallmann's syndrome(15.0%), pituitary adenoma(10.0%) and germinoma(5.0%), and those of female hypogonadotropic hypogonadism were prolactinoma(13.3%), Sheehan's syndrome(26.6%), pituitary adenoma(6.7%), tuberculous granuloma(6.7%), germinoma(6.7%), idiopathic hypogonadotropic hypogonadism(40.0%).4) The responses of LH and FSH to GnRH test were absent or markedly blunted in diffuse pituitary diseases such as pituitary tuberculous granuloma, pituitary macroadenomas, Sheehan's syndrome. However those were also absent or blunted in Cushing's disease and hypothalamic disease such as Kallmann's syndrome, germinoma, craniopharyngioma, idiopathic hypogonadotropic hypogonadism. 5) The responses of LH, FSH increased after repeated injection of GnRH in a patient with germinoma. 6) In diffuse destructive pituitary diseases such as Sheehan's syndrome, nonfunctioning macroadenomas, tuberculous granuloma, large prolactinoma, the combined deficiency of pituitary hormones other than gonadotropins was observed. 7) In many cases with hypothalamic diseases, the combined defects of pituitary hormone response were also seen.These data suggest that GnRH test is not always useful to localize the lesion between pituitary and hypothalamus, and combined pituitary stimulation test revealed defects of pituitary hormones other than gonadotropin in various hypothalamic diseases.Therefore repeated GnRH test would be useful for the differential diagnosis, and CRH test and GRH test would be necessary to demonstrate whether pituitary abnormality is present.

A case of multiple symmetric lipomatosis.: Seung Joon Oh, Jeong Taek Woo, Sung Woon Kim, Ihn Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1993;8(4):456-461. Published online January 1, 2001

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Abstract PDF: No abstract available.

Human IGF-I gene expression in normal and thyroid tumor tissues.: Sung Woon Kim, Hyun Ha Jang, Sang Mee Park, Deog Yoon Kim, Jeong Taek Woo, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Suck Hwan Koh, Sung Wha Hong, Young Kil Choi; J Korean Endocr Soc. 1993;8(4):414-421. Published online January 1, 2001

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Abstract PDF: No abstract available.

Effect of ipriflavone on the lumbodorsal pain in osteoporosis.: Jeong Taek Woo, Deok Yoon Kim, In Myung Yang, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1993;8(3):340-346. Published online January 1, 2001

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Abstract PDF: No abstract available.

Expression of type 1?collagen mRNA of osteoblast like(MC3T3-E1) celss to sodium fluoride.: Jeong Taek Woo, Sung Woon Kim, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi, Kwang Sik Seo, Kyu Rhim Chung, Jeung Bin Hwang; J Korean Endocr Soc. 1993;8(3):334-339. Published online January 1, 2001

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A clinical study of thyrotoxic periodic paralysis.: Sung Yi Kang, Sung Hoon Kim, Duk Yoon Kim, Jeong Taek Woo, In Myung Yang, Sung Woon Kim, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1993;8(1):19-26. Published online January 1, 2001

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Abstract PDF: No abstract available.

Review of clinical characteristics of primary hyperparathyroidism.: Hyung Keun Chung, Deog Yoon Kim, Jeong Taek Woo, Sang Woon Kim, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1992;7(3):234-242. Published online January 1, 2001

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Abstract PDF: No abstract available.

Expression of apolipoprotein C-II mRNA in cultured HepG2 cell.: Myung Jae Park, Dong Hee Seo, Kwang Sik Seo, Jeong Taek Woo, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1992;7(2):127-135. Published online January 1, 2001

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Abstract PDF: No abstract available.

Increase of bone mineral density after surgical treatment of primary hyperparathyroidism.: Hyun Duck Son, Jeong Taek Woo, Sung Woon Kim, Ihn Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1992;7(1):76-79. Published online January 1, 2001

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Abstract PDF: No abstract available.

A case of true precocious puberty successfully treated with LHRH analogue.: Hyun Suck Son, Jeong Taek Woo, Sung Woon Kim, Ihn Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1992;7(1):71-75. Published online January 1, 2001

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Expression of c-erb A mRNA according to thyroid function status.: Young Sil Ju, Jeong Taek Woo, Sung Woon Kim, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi, Sang Mi Park; J Korean Endocr Soc. 1992;7(1):24-30. Published online January 1, 2001

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Abstract PDF: No abstract available.

Role of hepatitis B infection in pathogenesis of autoimmune thyroid disease.: Hyung In Yang, Jeong Taek Woo, Seong Wun Kim, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1991;6(4):348-352. Published online January 1, 2001

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Abstract PDF: No abstract available.

A clinical study on 79 cases of lymphocytic thyroiditis by fine needle aspiration.: Kyung Jin Kim, Jeong Taek Woo, Sung Woon Kim, In Myung Yang, Jin Woo Kim, Young Seol Kim, Kwang Won Kim, Young Kil Choi; J Korean Endocr Soc. 1991;6(1):38-44. Published online January 1, 2001

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Abstract PDF: No abstract available.

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