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Hypothalamic-pituitary-testicular axis in patients with hyperthyroidism.

S Röjdmark¹, A Berg, G Kallner

¹Department of Internal Medicine II, Södersjukhuset, Stockholm, Sweden.

Hormone Research

|January 1, 1988

Summary

Chronic thyroid hormone excess, or hyperthyroidism, increases pituitary gonadotroph sensitivity to gonadotropin-releasing hormone (GnRH). This heightened response may explain enhanced Leydig cell function in hyperthyroid men.

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Area of Science:

Endocrinology
Reproductive Medicine
Thyroid Research

Background:

Thyroid hormones significantly impact reproductive function.
The influence of chronic thyroid hormone excess on the hypothalamic-pituitary-testicular axis requires further elucidation.

Purpose of the Study:

To investigate the effect of chronic thyroid hormone excess on the pituitary-gonadal axis in men.
To assess the responsiveness of luteinizing hormone (LH), follicle-stimulating hormone (FSH), and testosterone (T) to gonadotropin-releasing hormone (GnRH) in hyperthyroid versus euthyroid states.

Main Methods:

Eight hyperthyroid men underwent two identical intravenous GnRH stimulation tests.
The first test was conducted in a hyperthyroid state, and the second after achieving euthyroid status through medical treatment.

Related Experiment Videos

Serum LH, FSH, and T levels were measured before and after GnRH administration to calculate hormone incremental areas.

Main Results:

Basal LH, FSH, and T levels were comparable before and after treatment.
LH and FSH responsiveness to GnRH was significantly greater in the hyperthyroid state compared to the euthyroid state.
Serum testosterone showed a significant increase in response to GnRH during hyperthyroidism, but not when euthyroid.

Conclusions:

Chronic thyroid hormone excess appears to induce 'hypersensitivity' of pituitary gonadotrophs to exogenous GnRH.
This pituitary hypersensitivity may contribute to enhanced Leydig cell responsiveness observed in thyrotoxic patients.