Involvement of gamma amino butyric acid (GABA) in the postnatal function of the GnRH pulse generator as determined on the basis of GnRH and GnRH-receptor gene expression in the hypothalamus and the pituitary

Experimental and Clinical Endocrinology & Diabetes : Official Journal, German Society of Endocrinology [and] German Diabetes Association
C RothW Wuttke

Abstract

In many species the GnRH pulse generator functions early postnatally to become arrested during infancy. In rats highly variable LH levels in 15-day-old animals are suggestive that LH is being released by the pituitary in pulses whereas between day 20 after birth and puberty LH levels are low indicating that the GnRH pulse generator is arrested. In the present study we show on the basis of consecutively withdrawn blood samples in 15-day-old animals that LH pulses are indeed present at that age. The proper function of GnRH receptors in the pituitary is crucially dependent on pulsatile GnRH release from the hypothalamus. In addition, GnRH receptors have been demonstrated in the medial preoptic area and in the mediobasal hypothalamus of adult rats. In 15-day-old animals the functional GnRH pulse generator results in upregulated GnRH receptor gene expression as demonstrated by quantitative RT-PCR. It is not known what neural mechanisms are involved in turning the GnRH pulse generator off during infancy and a GABAergic brake has been discussed. Indeed, when 30-day-old animals were injected with the GABA-A receptor blocking drug bicuculline, this resulted in increased serum LH levels indicating that a tonic GABAergic inhibition is ind...Continue Reading

Citations

Jan 27, 2000·Cytokine & Growth Factor Reviews·B R LackeyD M Henricks
Apr 30, 2003·Journal of Neuroendocrinology·L KappelerJ Epelbaum
Apr 11, 2001·Obstetrics and Gynecology Clinics of North America·B N KalroS L Berga
Oct 7, 2004·The Journal of Toxicological Sciences·Audrey M Cummings, Robert J Kavlock
Apr 18, 2001·Journal of Pediatric Endocrinology & Metabolism : JPEM·M E Wilson
Nov 21, 2017·Journal of Cachexia, Sarcopenia and Muscle·Michael TielandBrian C Clark

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