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Reproductive Biology and Endocrinology
Published in: Reproductive Biology and Endocrinology 1/2010

Open Access 01-12-2010 | Research

Short term hypothyroidism affects ovarian function in the cycling rat

Authors: María Belén Hapon, Carlos Gamarra-Luques, Graciela A Jahn

Published in: Reproductive Biology and Endocrinology | Issue 1/2010

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Abstract

Background

Rats made hypothyroid with propilthyouracil start showing abnormal cycling on the second cycle after the start of the treatment, with a high proportion of spontaneous pseudopregnancies and reduced fertility.

Methods

To investigate some of the mechanisms involved in these reproductive abnormalities, hypothyroidism was induced in virgin rats by propilthyouracil (0.1 g/L in the drinking water) and we determined circulating hormones by radioimmunoassay and whole ovary expression of ovarian hormone receptors, growth factors and steroidogenic enzymes using semi-quantitative RT-PCR.
The study was performed on days 6 to 9 of treatment, corresponding to diestrus I (at 20.00-22.00 h), diestrus II (at 20.00-22.00 h), proestrus and estrus (both at 8.00-10.00 h and 20.00-22.00 h) of the second estrous cycle after beginning propilthyouracil treatment. Another group of rats was mated on day 8 and the treatment continued through the entire pregnancy to evaluate reproductive performance.

Results

Hypothyroidism increased circulating prolactin and estradiol on estrus 5 to 7-fold and 1.2 to 1.4-fold respectively. Growth hormone and insulin-like growth factor 1 diminished 60 and 20% respectively on proestrus morning. Hypothyroidism doubled the ovarian mRNA contents of estrogen receptor-beta on proestrus and estrus evenings, cyp19A1 aromatase mRNA on estrus evening and of growth hormone receptor on proestrus evening. Hypothyroidism did not influence ovulation rate or the number of corpora lutea at term, but a diminished number of implantation sites and pups per litter were observed (Hypothyroid: 11.7 +/- 0.8 vs. Control: 13.9 +/- 0.7).

Conclusions

Short term hypothyroidism alters normal hormone profile in the cycling rat increasing the expression of estrogen receptor-beta and cyp19A1 aromatase on estrus, which in turn may stimulate estradiol and prolactin secretion, favouring corpus luteum survival and the subsequent instauration of pseudopregnancy.
Appendix
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Metadata
Title
Short term hypothyroidism affects ovarian function in the cycling rat
Authors
María Belén Hapon
Carlos Gamarra-Luques
Graciela A Jahn
Publication date
01-12-2010
Publisher
BioMed Central
Published in
Reproductive Biology and Endocrinology / Issue 1/2010
Electronic ISSN: 1477-7827
DOI
https://doi.org/10.1186/1477-7827-8-14

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