Effects of castration or testosterone implants upon pituitary function in hypogonadal mice bearing normal foetal preoptic area grafts.

Abstract:

:Grafts of normal mouse preoptic area (POA) tissue into the third ventricle of gonadotrophin-releasing hormone (GnRH)-deficient hypogonadal (hpg) mice resulted in an elevation of pituitary GnRH receptors, an increased synthesis of luteinizing hormone (LH) and follicle-stimulating hormone (FSH) by the pituitary gland, an elevation of gonadal LH receptors and in the stimulation of steroidogenesis and spermatogenesis in the testis. In normal mice both castration or the subcutaneous implantation of testosterone capsules for 10 days reduced GnRH receptors, pituitary LH and FSH content, and the latter treatment also caused a 50% reduction in testicular LH receptors. In hpg mice bearing POA grafts testosterone implants failed to affect any of the above parameters, and castration failed to affect pituitary gonadotrophin hormone content, although there was a slight reduction in pituitary GnRH receptors after castration. These experiments suggest that neither the pituitary gonadotroph, nor the GnRH neurone represent major sites for the direct negative feedback of testosterone upon gonadotrophic hormone secretion in male mice.

journal_name

Neuroendocrinology

journal_title

Neuroendocrinology

authors

Charlton HM,Jones AJ,Ward BJ,Detta A,Clayton RN

doi

10.1159/000124762

subject

Has Abstract

pub_date

1987-05-01 00:00:00

pages

376-80

issue

5

eissn

0028-3835

issn

1423-0194

journal_volume

45

pub_type

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