Endocrinology and Metabolism

Eun Kyung Byun (Byun EK)

5 Articles

Calpain-10 Polymorphism in Korean Women with Polycystic Ovary Syndrome.: Hye jin Lee, Gun Woo Pyun, Eun Kyung Byun, Ji Young Oh, Jee Young Oh, Youngsun Hong, Yeon Ah Sung, Hye Won Chung; J Korean Endocr Soc. 2008;23(5):319-326. Published online October 1, 2008; DOI: https://doi.org/10.3803/jkes.2008.23.5.319

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BACKGROUND
Polycystic ovary syndrome (PCOS) is characterized by chronic anovulation, hyperandrogenism and insulin resistance, and PCOS is known to be associated with an increased risk of type 2 diabetes mellitus (DM). PCOS has also been proposed to share a common genetic background with type 2 DM. The calpain 10 (CAPN10) gene is known to be associated with type 2 DM in several different population. We examined the association of CAPN10 gene polymorphisms and their influence on the metabolic abnormalities in Korean women who suffer with PCOS. METHODS: One hundred sixty four women with PCOS and 325 control women were studied. The CAPN10 gene polymorphisms were genotyped by amplifying the genomic DNA. Anthropometric measures, a 75g oral glucose tolerance test and measurement of insulin sensitivity by the euglycemic hyperinsulinemic clamp technique were performed. RESULTS: The frequencies of CAPN10 UCSNP-43, UCSNP-19, UCSNP-63 and the haplotype combinations were not different between the women with PCOS and the control subjects. In the women with PCOS and who had the UCSNP-43 GA genotype, the post-load 90 minute plasma glucose level was significantly greater and the HDL cholesterol and insulin mediated glucose uptake were significantly lower compared to the women with PCOS and who had the GG genotype. CONCLUSION: The CAPN10 UCSNP-43 genotype might be responsible for insulin resistance, yet further study is required to confirm the role of this genetic polymorphism in the development of PCOS and the presentation of its disease features.

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Comments on the latest meta-analysis of CAPN10 polymorphism associations with polycystic ovary syndrome
Sidra Raihan, Dawood Shariff, Sami Bizzari
Gene.2019; 717: 144006. CrossRef

Adiponectin and Ghrelin Polymorphism in Korean Women with Polycystic Ovary Syndrome.: Hyejin Lee, Eun Kyung Byun, Hwi Ra Park, Jee Young Oh, Youngsun Hong, Yeon Ah Sung, Hyewon Chung; J Korean Endocr Soc. 2006;21(5):394-401. Published online October 1, 2006; DOI: https://doi.org/10.3803/jkes.2008.21.5.394

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Abstract PDF: BACKGROUND
Polycystic ovary syndrome (PCOS) is characterized by hyperandrogenism and chronic anovulation, and this is a common disorder in premenopausal women. However, the pathogenesis is still uncertain. There has been no studies about PCOS-related genetic abnormalities in Korea. In this study, we examined the frequency of the adiponectin and ghrelin genotypes in Korean women with PCOS. METHODS: Fifty four women with PCOS and 174 regular cycling healthy women were recruited for the study, and their reproductive hormones and metabolic profiles were measured. The polymorphisms of the ghrelin and adiponectin genes were analyzed. RESULTS: The frequency of ghrelin gene polymorphism was not different between the women with PCOS and the controls. The frequency of the TG adiponectin genotype was higher and the frequency of the TT genotype was lower in the women with PCOS compared to the controls (P < 0.05). For the PCOS women with GG adiponectin genotype, their triglycerides levels were significantly higher compared to the PCOS women with the TT and TG genotypes even after adjusting for the BMI. CONCLUSION: Adiponectin gene polymorphism is associated with presence of PCOS and it is responsible for the dyslipidemia seen in PCOS. Yet further study is required to confirm the role of this genetic polymorphism in the susceptibility to PCOS and the associated metabolic features.

Therapeutic Effects of Metformin and Rosiglitazone in Korean Women with Polycystic Ovary Syndrome.: Jee Young Oh, Eun Kyung Byun, Hwi Ra Park, Young Ju Choi, Hyo Jung Kim, Hye Jin Lee, Young Sun Hong, Yeon Ah Sung, Hye Won Chung; J Korean Endocr Soc. 2005;20(5):467-475. Published online October 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.5.467

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Abstract PDF

BACKGROUND
Insulin resistance is a central feature of polycystic ovary syndrome (PCOS), and hyperinsulinemia contributes to anovulation, oligo or amenorrhea, hyperandrogenism and infertility in women with PCOS. The use of insulin sensitizers, such as metformin or thiazolidinedione, in PCOS is becoming increasingly accepted. The purpose of our study was to evaluate the therapeutic effects of metformin and rosiglitazone on the metabolic and reproductive derangement, and find parameters predicting their therapeutic efficacy in Korean PCOS women. METHODS: Sixty-two women with PCOS were recruited. The baseline characteristics, including BMI, glucose tolerance test, lipid profiles, sex hormones and hyperinsulinemic euglycemic clamp test, were assessed. After the administration of the insulin sensitizer (metformin 1.5g/day or rosiglitazone 4mg/day) for 3 months, the insulin sensitivity was reassessed. A drug response was defined as menstrual restoration or pregnancy. RESULTS: Of the 62 women with PCOS, 36 gained restored regular menstruation, and a further 5 conceived (a drug response rate of 66.7%). There were no significant clinical differences between responders and nonresponders. Twelve weeks after taking the drugs, the insulin sensitivity was significantly improved (M-value 4.7+/-0.2 vs. 5.5+/-0.4mg/kg/min, P<0.05), and the free testosterone levels(72.5+/-39.9 vs. 45.8 +/-3.8pmol/L, P<0.05) were significantly decreased, without significant weight reduction. CONCLUSION: Metformin and rosiglitazone restored menstruation in 66.1% of women with PCOS. Hyperandrogenemia and insulin sensitivity were significantly improved with the use of the two drugs. However, metabolic or hormonal markers for predicting the drug response could not be found.

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Diagnosis and Treatment of Polycystic Ovary Syndrome
Hyejin Lee, Yeon-ah Sung
Journal of Korean Endocrine Society.2007; 22(4): 252. CrossRef

The Prevalence of Polycystic Ovary Syndrome in College Students from Seoul.: Eun Kyung Byun, Hyo Jeong Kim, Jee Young Oh, Young Sun Hong, Yeon Ah Sung; J Korean Endocr Soc. 2005;20(2):120-126. Published online April 1, 2005; DOI: https://doi.org/10.3803/jkes.2005.20.2.120

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BACKGROUND
Polycystic ovary syndrome(PCOS) is characterized by the presence of chronic anovulation and hyperandrogenism, The prevalence of PCOS in premenopausal women of about 5~ 10%. There may be significant ethnic and racial variations in the prevalence and clinical presentation of PCOS. The current study was undertaken to determine the prevalence of PCOS and to identify the clinical characteristics of PCOS in Korea. METHODS: From March 2003 to March 2004, medical students from Ewha Womans University were investigated for the prevalence of PCOS. The evaluation included a history and physical examination, a modified Ferriman-Gallwey hirsutism score and screening for hyperandrogenemia. PCOS was diagnosed by the presence of the following: 1) oligomenorrhea, 2) hyperandrogenemia and/or hirsutism(a modified Ferriman-Gallwey score> or =6), and 3) the exclusion of related disorders. Hyperandrogenemia was defined as a free testosterone level above the 95th percentile of that for normal cycling nonhirsute women. RESULTS: Out of 492 students, 386 replied to the questionnaire and 203 students(19~31 yr of age) participated in the physical examination and blood sampling. Eumenorrhea without hirsutism was present in 133 students(65.5%), oligomenorrhea was present in 39 students(19.2%), hyperandrogenism was present in 21 students(10.3%) and hirsutism was present in 3(1.5%) of the 203 women. The prevalence of PCOS was 4.9%(10 of 203 students), and only 2 of 10 women with PCOS were hirsute. The mean body mass index of students with PCOS was 22.7+/- 4.3kg/m2, and two women was obese. The plasma insulin levels during the 75g oral glucose tolerance test in women with PCOS was significantly higher when compared to the age and body mass index of the controls. CONCLUSION: The prevalence of PCOS was 4.9% in college students from Seoul. This rate is similar to those rates reported by other investigators in Greece(6.7%) and United States(4%). Obesity and hirsutism are not common in Korean women with PCOS. We are planning to survey a more diverse age groups to determine the prevalence of PCOS

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Ethnicity in polycystic ovary syndrome
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Preventive Behavior Intentions for Polycystic Ovary Syndrome in Young Students
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Metabolic Syndrome and Related Disorders.2022;[Epub] CrossRef
Age-Adjusted Prevalence and Characteristics of Women with Polycystic Ovarian Syndrome in Korea: A Nationwide Population-Based Study (2010–2019)
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Effects of Exposure Duration and Exposure Levels of Ambient Air Pollutants on the Risk of Polycystic Ovarian Syndrome: A 2015–2019 Korean Population-Based Cohort Study
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Gamitaeeumjowee-tang for Weight Loss in Overweight and Obese Women with Polycystic Ovary Syndrome: A Retrospective Chart Review
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Prevalence of Gestational Diabetes Mellitus in Korea: A National Health Insurance Database Study
Bo Kyung Koo, Joon Ho Lee, Jimin Kim, Eun Jin Jang, Chang-Hoon Lee, Noel Christopher Barengo
PLOS ONE.2016; 11(4): e0153107. CrossRef
Ethnic differences: Is there an Asian phenotype for polycystic ovarian syndrome?
Zhongwei Huang, Eu-Leong Yong
Best Practice & Research Clinical Obstetrics & Gynaecology.2016; 37: 46. CrossRef
Oral Contraceptive Use, Micronutrient Deficiency, and Obesity among Premenopausal Females in Korea: The Necessity of Dietary Supplements and Food Intake Improvement
Boyoung Park, Jeongseon Kim, David O. Carpenter
PLOS ONE.2016; 11(6): e0158177. CrossRef
Metabolic effects of polycystic ovary syndrome in adolescents
Yejin Han, Hae Soon Kim, Hye-Jin Lee, Jee-Young Oh, Yeon-Ah Sung
Annals of Pediatric Endocrinology & Metabolism.2015; 20(3): 136. CrossRef
Epidemiology and Diagnostic Criteria of Polycystic Ovary Syndrome
Hyejin Lee, Yeon-Ah Sung
The Journal of Korean Diabetes.2015; 16(3): 189. CrossRef
Dietary intake, dietary habits, and depression in Korean women with polycystic ovary syndrome
Seung Hyun Kim, Hyesook Kim, Seung Hee Park, Ji Yun Hwang, Hey Won Chung, Namsoo Chang
Korean Journal of Nutrition.2012; 45(3): 229. CrossRef
Hyperandrogenism in Women: Polycystic Ovary Syndrome
Yeon-Ah Sung
Hanyang Medical Reviews.2012; 32(4): 197. CrossRef
Polymorphism T→C of gene CYP17 promoter and polycystic ovary syndrome risk: A meta-analysis
Ya Li, Fei Liu, Shan Luo, Han Hu, Xiao-Hong Li, Shang-Wei Li
Gene.2012; 495(1): 16. CrossRef
Polycystic Ovary Syndrome in Korean Women: Clinical Characteristics and Diagnostic Criteria
Yeon-Ah Sung
Endocrinology and Metabolism.2011; 26(3): 203. CrossRef
Pro12Ala and His447His polymorphisms of PPAR-γ are associated with polycystic ovary syndrome
Bon-Hee Gu, Kwang-Hyun Baek
Reproductive BioMedicine Online.2009; 18(5): 644. CrossRef
Association study between single nucleotide polymorphisms in the VEGF gene and polycystic ovary syndrome
Eung-Ji Lee, Bermseok Oh, Jong-Young Lee, Kuchan Kimm, Jung-Mi Park, Kwang-Hyun Baek
Fertility and Sterility.2008; 89(6): 1751. CrossRef
Androgen receptor gene CAG repeat polymorphism in women with polycystic ovary syndrome
Jin Ju Kim, Seon Ha Choung, Young Min Choi, Sang Ho Yoon, Seok Hyun Kim, Shin Yong Moon
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A novel single nucleotide polymorphism of INSR gene for polycystic ovary syndrome
Eung-Ji Lee, Bermseok Oh, Jong-Young Lee, Kuchan Kimm, Sook-Hwan Lee, Kwang-Hyun Baek
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Diagnosis and Treatment of Polycystic Ovary Syndrome
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Single nucleotide polymorphism in exon 17 of the insulin receptor gene is not associated with polycystic ovary syndrome in a Korean population
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Association of Serum Adiponectin Levels with Insulin Resistance in Women with Polycystic Ovary Syndrome.: Young Sun Hong, Jee Young Oh, Eun Kyung Byun, Yeon Ah Sung; J Korean Endocr Soc. 2004;19(4):369-378. Published online August 1, 2004

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Abstract PDF: BACKGROUND
Polycystic ovary syndrome (PCOS) is known to be associated with obesity and insulin resistance. The exact mechanism of insulin resistance in PCOS is not completely understood, but there are several pieces of evidence suggesting humoral mediator involvement. Adiponectin, an adipocyte-secreted protein, could be a possible link between adiposity and insulin resistance. This study was performed to see whether the serum adiponectin levels are suppressed in woman with PCOS and if this is associated with the characteristic hormonal and metabolic features of PCOS. METHODS: 20 women with PCOS and 8 normal controls with regular cycles were recruited. The serum adiponectin levels were measured by RIA, and the fasting glucose to insulin ratio (GIR) used as an insulin sensitivity index. RESULTS: The patients with PCOS were classified as lean (BMI < 23 kg/m2, n=9) and obese groups (BMI 25 kg/m2, n=11) based on the WPRO criteria. The GIR was significantly lower in the obese compared to the control group. The adiponectin level was lower in women with PCOS than the controls, but without statistical significance. In 5 of the 20 patients, the GIR was higher than 0.30, which was the lowest limit in the controls, and the adiponectin level was significantly higher than in those patients with a lower GIR. The adiponectin level was significantly correlated with the BMI, subcutaneous and visceral fat areas, post challenge 2 hr glucose, fasting insulin, GIR and SHBG. After adjustment for BMI, adiponectin was significantly correlated with the GIR in all subjects, including the controls. CONCLUSION: The serum adiponectin level was associated with and related to adiposity in women with PCOS; however, adiponectin might be associated with insulin resistance independently from adiposity

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