Abolition of endocrine dimorphism in hyperthyroid males? An argument for the positive feedback effect of hyperoestrogenaemia on LH secretion

作者：Kumar A^*; Dewan R; Suri J; Kohli S; Shekhar S; Dhole B; Chaturvedi P K

来源：Andrologia, 2012, 44(4): 217-225.

DOI：10.1111/j.1439-0272.2011.01270.x

• Follicle-stimulating hormone
• hyperthyroidism
• luteinising hormone
• oestradiol
• testosterone

Our aim was (i) to investigate the hypothalamohypophysealgonadal axis in hyperthyroid Indian males, (ii) to rule out the modulatory role of adrenal steroids on it and (iii) to determine if the simultaneous rise in oestradiol and luteinising hormone (LH) in hyperthyroid males is due to a positive feedback action of oestradiol on pituitary LH release. Age- and BMI-matched men were divided into two groups, I, euthyroid subjects (n similar to=similar to 17) and II, hyperthyroid patients (n similar to=similar to 12) on the basis of their thyroid hormone levels. Serum levels of thyroid-stimulating hormone, triiodothyronine, thyroxine, LH, follicle-stimulating hormone (FSH), prolactin, E2, T, P4, sex hormone binding globulin and dehydroepiandrosterone sulphate (DHEAS) were assayed. Mean levels of T and E2 were approximately two times higher in group II in comparison with group I. DHEAS levels were similar in both groups ruling out any adrenal involvement. Mean serum LH level was 2.6 folds higher in group II in comparison with group I. Mean serum levels of FSH were higher in group II, it was marginally nonsignificant. On the basis of these and previous observations, we hypothesise that endocrinological dimorphism in human male and female is not rigid; a sustained rise in serum oestradiol probably induces a positive feedback action on pituitary leading to elevated gonadotrophin levels.

• 出版日期2012-8
• 单位河北医科大学