Regulation of Myometrial Gi2, Gi3, and Gq Expression during Pregnancy. Effects of Progesterone and Estradiol1

Autor:	Joëlle Cohen-Tannoudji, Jean-Luis Lecrivain, Jamila Elwardy-Merezak, Jean-Paul Maltier, Sakina Mhaouty, Marie-Therese Robin, Chantal Legrand
Rok vydání:	1995
Předmět:	Messenger RNA medicine.medical_specialty Phospholipase C G protein medicine.drug_class Myometrium Cell Biology General Medicine Biology Adenylyl cyclase chemistry.chemical_compound Endocrinology Reproductive Medicine chemistry Estrogen Internal medicine Gene expression medicine G alpha subunit
Zdroj:	Biology of Reproduction. 53:55-64
ISSN:	1529-7268 0006-3363
DOI:	10.1095/biolreprod53.1.55
Popis:	The possibility that progesterone or estradiol may regulate expression of G protein in the rat myometrium during the course of pregnancy has been investigated using 1) immunoblot analysis of Gi2 alpha, Gi3 alpha, and Gq alpha subunits and 2) hybridization blot analysis of subunit mRNA. Eighteen hours after administration, estradiol had significantly increased the levels of both Gi2 alpha subunit and Gi2 alpha mRNA (by 40% and 32%, respectively). In control pregnant rats, we observed similar changes at the end of pregnancy, when myometrial concentrations of estradiol had increased, i.e., a 41% increase in immunoreactive Gi2 alpha subunit that correlated with a parallel 45% increase in mRNA levels. In contrast, levels of immunoreactive Gi3 alpha subunit and mRNA, which decreased with advancing gestation, were not influenced by estradiol or progesterone administration. Progesterone administration resulted 30 h later in a significantly decreased level of Gq alpha immunoreactivity (32%) and Gq alpha mRNA (30%). In control rats, Gq alpha protein and mRNA were also significantly lower at midpregnancy under progesterone dominance vs. term. At this stage, a twofold increase in Gq alpha subunit correlated with a 40% increase in mRNA levels. These results demonstrate that myometrial Gi2 alpha and Gq alpha subunits are physiological targets for estradiol and progesterone, respectively, in vivo. Alterations of these G protein levels are discussed in relation to their mediating effects on adenylyl cyclase activity or the phospholipase C pathway during the course of pregnancy.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::81338debfaec71c1f9b4ea5ebf3622c9 https://doi.org/10.1095/biolreprod53.1.55 Zobrazit plný text záznamu