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Original Article 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
Endocrinology and Metabolism 1999;14(2):365-371

Published online: January 1, 2001
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BACKGROUND
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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