Effects of Asn318 and Asp87Asn318 mutations on signal transduction by the gonadotropin-releasing hormone receptor and receptor regulation

Endocrinology
W M AwaraP M Conn

Abstract

GnRH receptor (GnRH-R) contains Asn87 and Asp318 instead of the more frequently observed Asp87 and Asn318 found in other G protein-coupled receptors. In the present study, site-directed mutagenesis was used to introduce Asn318 and Asp87Asn318 into GnRH-R. The effect on coupling and regulation of GnRH-R was studied by stable expression of wild and mutant mouse GnRH-R in the lactotropic GH3 cells; these normally release PRL in response to TRH stimulation. The responses to Buserelin (a metabolically stable GnRH analog) in three different cell lines, M1, N8, and ND1 (expressing wild-type, Asn318 mutant, and Asp87Asn318 mutant mouse GnRH-R, respectively) were compared with that observed in the previously characterized GGH3-1' cells, which stably express rat GnRH-R. The Asn318 and Asp87Asn318 mutations had no measurable effect on ligand binding, but abolished the initial down-regulation of receptor that was observed in M1 and GGH3-1' cells, suggesting that the normal location of Asn87 and Asp318 in GnRH-R is involved in the regulation of GnRH-R. In N8 and ND1 cells, Buserelin-stimulated inositol phosphate (IP) production was attenuated, but the release of both cAMP and PRL was stimulated in a dose- and time-dependent manner. These mu...Continue Reading

Citations

Feb 28, 2009·The Journal of Endocrinology·Eduardo Jardón-ValadezAlfredo Ulloa-Aguirre
Apr 15, 2004·Endocrine Reviews·Robert P MillarStuart R Maudsley
Aug 6, 2008·The Journal of Physical Chemistry. B·Eduardo Jardón-ValadezAngel Piñeiro
Jul 17, 2019·Current Medicinal Chemistry·Haralambos TzoupisTheodore Tselios
Jan 1, 1997·Annual Review of Neuroscience·T GudermannG Schultz

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