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Horm Metab Res 2012; 44(07): 520-526
DOI: 10.1055/s-0032-1312667
Original Basic
© Georg Thieme Verlag KG Stuttgart · New York

Developmental Plasticity in Thyroid Function Primed by Maternal Hyperleptinemia in Early Lactation: A Time-course Study in Rats

M.C. F. Passos
1   Department of Physiological Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
,
P. C. Lisboa
1   Department of Physiological Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
,
F. Pereira-Toste
1   Department of Physiological Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
,
E. Oliveira
1   Department of Physiological Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
,
E. G. Moura
1   Department of Physiological Sciences, State University of Rio de Janeiro, Rio de Janeiro, RJ, Brazil
› Author Affiliations
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Publication History

received 10 January 2012

accepted 23 April 2012

Publication Date:
25 May 2012 (online)

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Abstract

Pups whose mothers were leptin-treated during the last 3 days of lactation have thyroid dysfunction at adulthood. However, there was no report about leptin treatment in the first days of life or about its action on thyroid function during development. Here, we evaluated the effects of maternal leptin treatment on the first 10 days of lactation upon thyroid function of the offspring at 21, 30, and 180 days old. At birth, lactating Wistar rats were divided into: Leptin (Lep) – leptin-treated (8 μg/100 g of body weight, s.c.) for the first 10 days of lactation and Control (C, saline-treated). Mothers were killed at the end of lactation and their offspring at 21, 30, and 180 days old. Triiodothyronine (T3), thyroxine (T4), thyrotropin (TSH), and leptin levels in serum and milk were measured. Liver mitochondrial glycerolphosphate dehydrogenase (mGPD) activity was determined. Significant differences had p<0.05. At the end of lactation, Lep mothers had higher milk T3 (+ 30%), while their offspring had higher serum T3 (+ 20%) and TSH (+ 84%). At 30 days-old, Lep offspring showed lower TSH ( − 48%), T3 ( − 20%), and mGPDm ( − 42%). At 180 days-old, Lep group presented hyperleptinemia (1.4-fold increase), higher serum T3 (+ 22%), and lower mGPD activity ( − 57%). Maternal hyperleptinemia on lactation causes hypothyroidism in the pups at 30 days, which may program for higher serum T3 at adulthood. In conclusion, maternal hyperleptinemia during lactation, that is common in obese mothers, may have an impact in future disease development, such as thyroid dysfunction.

Key words

leptin - programming - lactation - thyroid function
 

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