Effects of elevated gonadotropin levels on thyroid function in the male rat

R. W. Steger; V. Chandrashekar; A. Bartke; J. Wortsman; S. C. Newton; R. C. Smallridge; J. Dietrich

doi:10.1016/0024-3205(89)90439-6

Effects of elevated gonadotropin levels on thyroid function in the male rat

R. W. Steger, V. Chandrashekar, A. Bartke, J. Wortsman, S. C. Newton, R. C. Smallridge, J. Dietrich

Endocrinology

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

In order to determine if thyroid disease in hypogonadal men is the result of chronic elevation of serum gonadotropins, thyroid histology and serum thyroid hormone levels were evaluated in male rats that had been castrated either 2 weeks or 15 months previously. Despite significantly elevating serum LH levels, castration did not affect thyroid structure or function. Serum total T4 levels were reduced with age in both short and long-term castrate animals but returned to the levels seen in young rats when testosterone was replaced. Testosterone replacement also increased free T4 levels in both the young and old castrate rats. Neither age nor testosterone replacement affected serum T3 or TSH levels.

Original language	English (US)
Pages (from-to)	85-90
Number of pages	6
Journal	Life Sciences
Volume	45
Issue number	1
DOIs	https://doi.org/10.1016/0024-3205(89)90439-6
State	Published - 1989

ASJC Scopus subject areas

General Pharmacology, Toxicology and Pharmaceutics
General Biochemistry, Genetics and Molecular Biology

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abstract = "In order to determine if thyroid disease in hypogonadal men is the result of chronic elevation of serum gonadotropins, thyroid histology and serum thyroid hormone levels were evaluated in male rats that had been castrated either 2 weeks or 15 months previously. Despite significantly elevating serum LH levels, castration did not affect thyroid structure or function. Serum total T4 levels were reduced with age in both short and long-term castrate animals but returned to the levels seen in young rats when testosterone was replaced. Testosterone replacement also increased free T4 levels in both the young and old castrate rats. Neither age nor testosterone replacement affected serum T3 or TSH levels.",

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AU - Chandrashekar, V.

AU - Bartke, A.

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AU - Newton, S. C.

AU - Smallridge, R. C.

AU - Dietrich, J.

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N2 - In order to determine if thyroid disease in hypogonadal men is the result of chronic elevation of serum gonadotropins, thyroid histology and serum thyroid hormone levels were evaluated in male rats that had been castrated either 2 weeks or 15 months previously. Despite significantly elevating serum LH levels, castration did not affect thyroid structure or function. Serum total T4 levels were reduced with age in both short and long-term castrate animals but returned to the levels seen in young rats when testosterone was replaced. Testosterone replacement also increased free T4 levels in both the young and old castrate rats. Neither age nor testosterone replacement affected serum T3 or TSH levels.

AB - In order to determine if thyroid disease in hypogonadal men is the result of chronic elevation of serum gonadotropins, thyroid histology and serum thyroid hormone levels were evaluated in male rats that had been castrated either 2 weeks or 15 months previously. Despite significantly elevating serum LH levels, castration did not affect thyroid structure or function. Serum total T4 levels were reduced with age in both short and long-term castrate animals but returned to the levels seen in young rats when testosterone was replaced. Testosterone replacement also increased free T4 levels in both the young and old castrate rats. Neither age nor testosterone replacement affected serum T3 or TSH levels.

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Effects of elevated gonadotropin levels on thyroid function in the male rat

Abstract

ASJC Scopus subject areas

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