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The Steroid-Neuropeptide Connection in the Control of LHRH Secretion

  • Chapter
Regulation of Ovarian and Testicular Function

Part of the book series: Advances in Experimental Medicine and Biology ((AEMB,volume 219))

Abstract

The concept that hormonal secretions of the gonads are the primary signals that drive and sustain the intricate balance within the closed feedback loop of the hypothaiamo-pituitary-gonadal axis is well established. In 1932, Moore and Price proposed that a tight reciprocal relationship between the gonad and the pituitary was responsible for maintaining gonadal function in the adult rat (Fig. 1). Intensive investigations over the intervening years have affirmed the broad outline of this gonad-pituitary “push-pull” operation. The secretion of luteinizing hormone (LH) and follicle stimulating hormone (FSH) is generally restrained to a low basal range in intact rats, and in the absence of the gonadal feedback signals, as exemplified by gonadectomy, gonadotropins are secreted at augmented rates. It is apparent that gonadal steroids do not inhibit LH release by directly restraining the release of LH from the pituitary gonadotrophs but they monitor the response of gonadotrophs to luteinizing hormone releasing hormone (LHRH), the hypothalamic humoral signal secreted in episodic fashion. Further, the evidence suggests that androgens in male rats and a combined milieu of estradiol-17β (E2) and progesterone (P) in female rats diminish, while E2 in the absence of P, facilitate the LHRH-induced LH release.

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Authors and Affiliations

  1. Department of Obstetrics and Gynecology, University of Florida College of Medicine, Gainesville, FL, 32610, USA

    S. P. Kalra, P. S. Karla, A. Sahu & L. G. Allen

  2. Department of Pharmacology, University of Tennesse, Memphis, TN, 38163, USA

    W. R. Crowley

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  1. S. P. Kalra
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  2. P. S. Karla
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  3. A. Sahu
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  4. L. G. Allen
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  5. W. R. Crowley
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Editors and Affiliations

  1. Medical College Of Georgia, Augusta, Georgia, USA

    Virendra B. Mahesh

  2. National Institutes of Health, Bethesda, Maryland, USA

    Dharam S. Dhindsa

  3. Harvard Medical School, Boston, Massachusetts, USA

    Everett Anderson

  4. University of Florida College of Medicine, Gainesville, Florida, USA

    Satya P. Kalra

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© 1987 Plenum Press, New York

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Kalra, S.P., Karla, P.S., Sahu, A., Allen, L.G., Crowley, W.R. (1987). The Steroid-Neuropeptide Connection in the Control of LHRH Secretion. In: Mahesh, V.B., Dhindsa, D.S., Anderson, E., Kalra, S.P. (eds) Regulation of Ovarian and Testicular Function. Advances in Experimental Medicine and Biology, vol 219. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-5395-9_4

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