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Endocrinol Metab : Endocrinology and Metabolism


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Jong Kwan Jun  (Jun JK) 2 Articles
Clinical Study
Effects of Maternal Iodine Status during Pregnancy and Lactation on Maternal Thyroid Function and Offspring Growth and Development: A Prospective Study Protocol for the Ideal Breast Milk Cohort
Young Ah Lee, Sun Wook Cho, Ho Kyung Sung, Kyungsik Kim, Young Shin Song, Sin Je Moon, Jung Won Oh, Dal Lae Ju, Sooyeon Choi, Sang Hoon Song, Gi Jeong Cheon, Young Joo Park, Choong Ho Shin, Sue K. Park, Jong Kwan Jun, June-Key Chung
Endocrinol Metab. 2018;33(3):395-402.   Published online September 18, 2018
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  • 82 Download
  • 1 Web of Science
  • 2 Crossref
AbstractAbstract PDFPubReader   ePub   

Iodine is an intrinsic element of thyroid hormone, which is essential for childhood growth and development. The Ideal Breast Milk (IBM) cohort study aims to evaluate the effects of maternal iodine status during pregnancy and lactation on maternal thyroid function, offspring growth and development, and offspring thyroid function.


The IBM cohort study recruited pregnant women from Seoul National University Hospital between June 2016 and August 2017, followed by enrollment of their offspring after delivery. For the maternal participants, iodine status is evaluated by urinary iodine concentration (UIC) and dietary records in the third trimester and at 3 to 4 weeks and 12 to 15 months postpartum. For the child participants, cord blood sampling and UIC measurements are performed at birth. At 3 to 4 weeks of age, UIC and breastmilk iodine concentrations are measured. At 12 to 15 months of age, growth and development are assessed and measurements of UIC, a thyroid function test, and ultrasonography are performed.


A total of 198 pregnant women in their third trimester were recruited. Their mean age was 35.1±3.5 years, and 78 (39.4%) of them were pregnant with twins. Thirty-three (16.7%) of them had a previous history of thyroid disease.


Korea is an iodine-replete area. In particular, lactating women in Korea are commonly exposed to excess iodine due to the traditional practice of consuming brown seaweed soup postpartum. The study of the IBM cohort is expected to contribute to developing guidelines for optimal iodine nutrition in pregnant or lactating women.


Citations to this article as recorded by  
  • High intakes of iodine among women during pregnancy and the postpartum period has no adverse effect on thyroid function
    Dal Lae Ju, Sun Wook Cho, Chae Won Chung, Young Ah Lee, Gi Jeong Cheon, Young Joo Park, Choong Ho Shin, Jong Kwan Jun, June-Key Chung, Sue K. Park, YoonJu Song
    European Journal of Nutrition.2023; 62(1): 239.     CrossRef
  • Associations between maternal thyroid function in pregnancy and child neurodevelopmental outcomes at 20 months in the Seychelles Child Development Study, Nutrition Cohort 2 (SCDS NC2)
    Anna M. Monaghan, Maria S. Mulhern, Emeir M. Mc Sorley, J.J. Strain, Theresa Winter, Edwin van Wijngaarden, Gary J. Myers, Philip W. Davidson, Conrad Shamlaye, Jude Gedeon, Alison J. Yeates
    Journal of Nutritional Science.2021;[Epub]     CrossRef
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Serum Leptin in Cord Blood and Its Relation with Birth Weight and Metabolic Parameters.
Do Joon Park, Yun Yong Lee, Kyung Soo Park, Sung Yeon Kim, Bo Yeon Cho, Hong Gyu Lee, Gun Sang Park, Jong Kwan Jun, Bo Hyun Yoon
J Korean Endocr Soc. 1999;14(2):365-371.   Published online January 1, 2001
  • 915 View
  • 17 Download
AbstractAbstract PDF
Leptin, produced in the adipose tissue, is involved in the regulation of body weight. The release of the leptin is increased in obese adults even in children. This study investigated whether the serum leptin in cord blood was related to babys birth weight and metabolic parameters. METHODS: 71 pairs of singleton pregnancy babies and their mother were studied. Babies are classified in LGA (large for gestational age), AGA (appropriate for gestational age), SGA (small for gestational age) three groups. After delivery, cord blood and maternal venous blood samples were drawn. We measured the plasma leptin, insulin-like growth factor (IGF)-1, insulin and proinsulin in cord and maternal serum. RESULTS: The concentration of leptin from cord blood was increased in LGA babies and decreased in SGA babies compued with the level in AGA babies. There was positive correlatian (r=0.55, p<0.01) between the plasma leptin level in cord and birth weight. There were positive correlatian between both the plasma proinsulin (r=0.37, p<0.01) and IGF-1 (r=0.32, p<0.01) and birth weight, too. But there was no difference between female and male baby's cord blood leptin level. In multiple regression analysis, cord blood leptin level was found independent factor related to birth weight ( p=0.001) CONCLUDION : The plasma leptin, proinsulin and IGF-1 is correlates to the birth weight. These data provide evidence that leptin and proinsulin are highly related to the nutritional status already during the fetal periods, and effect on the intrauterine fetal growth.
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