GH as a co-gonadotropin: the relevance of correlative changes in GH secretion and reproductive state

in Journal of Endocrinology
Authors:
KL Hull
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S Harvey
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DOI:
https://doi.org/10.1677/joe.0.1720001
Volume/Issue:
Volume 172: Issue 1
Article Type:
Other
Page Range:
1–19
Online Publication Date:
01 Jan 2002
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It is now well established that exogenous GH promotes sexual maturation and reproductive function. The possibility that this may reflect physiological actions of endogenous GH has, however, rarely been considered. Correlative changes in GH secretion and reproductive state (puberty, pregnancy, lactation, menopause and ovarian cycles) are thus the primary focus of this review. GH secretion is, for instance, elevated during major transitions in reproductive status such as puberty and pregnancy. In some cases, augmented circulating GH levels are paired with hepatic GH resistance. This interaction may permit selective activation of gonadal responses to GH without activating IGF-I-mediated systemic responses. This selective activation may also be mediated by autocrine, paracrine or intracrine GH actions, since GH is also synthesized in reproductive tissues. Correlative changes in GH secretion and reproductive state may be mediated by events at the hypothalamic, pituitary and gonadal level. In addition to direct effects on gonadal function, GH may influence reproductive activity by increasing gonadotropin secretion at the hypothalamic and pituitary level and by enhancing gonadotropin responsiveness at the gonadal level. The close association between reproductive status and the somatotrophic axis supports the physiological importance of GH in reproductive function.

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Print ISSN:
0022-0795
Online ISSN:
1479-6805
Page(s):
19
Article Type:
Other
Print Publication Date:
01 Jan 2002
Online Publication Date:
01 Jan 2002