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Repercussions of the thyroid hormone treatment on the molecular markers of the gonadal function

Grant number: 09/17822-8
Support Opportunities:Regular Research Grants
Duration: March 01, 2010 - February 29, 2012
Field of knowledge:Biological Sciences - Physiology - Physiology of Organs and Systems
Principal Investigator:Maria Tereza Nunes
Grantee:Maria Tereza Nunes
Host Institution: Instituto de Ciências Biomédicas (ICB). Universidade de São Paulo (USP). São Paulo , SP, Brazil

Abstract

Currently it is considered that half of the marital problems of fertility are due to male dysfunction. Several studies indicate that reproductive physiology is influenced by variations in serum concentrations of thyroid hormones (TH). In fact, problems of fertility are frequently observed in cases of hypo or hyperthyroidism. It is well known that TH may act through genomic and non-genomic mechanisms. This study aimed to investigate the effects of the thyroid hormone: (1) in the expression of androgen (ARs), LH (LHr), and FSH (FSHr) receptors, and the 5-alpha-reductase enzyme, by means of the evaluation of the: (a) expression of the respective mRNAs and proteins, by Real time-PCR and Western Blotting, and (b) localization of these proteins by immunohistochemistry; (2) and on serum concentrations of FSH, LH, testosterone, dihydrotestosterone, TSH, T3 and T4. To address these questions, euthyroid and hypothyroid rats will be subjected to chronic (5 days, 5X physiological dose) and acute (30 min: 5X and 50X the physiological dose) treatment with T3 and, then submitted to the proposed evaluations. The assessment of the acute effect of HT will permit inferences mainly related to its possible non-genomic effects on testicular and epididymal function. The results will be analyzed by appropriate statistical methodology for each variable studied. (AU)

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Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
ROMANO, RENATA MARINO; BARGI-SOUZA, PAULA; BRUNETTO, ERIKA LIA; GOULART-SILVA, FRANCEMILSON; SALGADO, RENATO M.; TENORIO ZORN, TELMA MARIA; NUNES, MARIA TEREZA. Triiodothyronine differentially modulates the LH and FSH synthesis and secretion in male rats. ENDOCRINE, v. 59, n. 1, p. 191-202, . (09/17822-8, 13/05629-4)
ROMANO, RENATA MARINO; BARGI-SOUZA, PAULA; BRUNETTO, ERIKA LIA; GOULART-SILVA, FRANCEMILSON; WERNECK AVELLAR, MARIA CHRISTINA; OLIVEIRA, CLAUDIO ALVARENGA; NUNES, MARIA TEREZA. Hypothyroidism in Adult Male Rats Alters Posttranscriptional Mechanisms of Luteinizing Hormone Biosynthesis. THYROID, v. 23, n. 4, p. 497-505, . (09/17822-8)

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