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Título

CCAAT/enhancer binding protein-mediated role of thyroid hormone in the developmental expression of the kidney androgen-regulated protein gene in proximal convoluted tubules

AutorTeixidó, N.; Huguet Soler, Montserrat; Pérez-Rivera, Norma G.; Bernués, Jordi CSIC ORCID ; Meseguer, Anna
Fecha de publicaciónfeb-2006
EditorEndocrine Society
CitaciónMolecular Endocrinology 20(2): 389-404 (2006)
ResumenThe kidney androgen-regulated protein (KAP) gene is exclusively expressed in proximal tubules of mouse kidney and in the uterus of pregnant females before they give birth. It displays an exquisite and differential regulation of expression by steroid and thyroid hormones (THs) in different proximal tubule segments. Whereas the pars recta (PR cells) responds to thyroid and sexual hormones, the pars convoluta (PCT cells) represents a truly androgen-dependent compartment because expression occurs only in the presence of androgens and functional androgen receptors. Nevertheless, different hypothyroidism models have indicated that TH might also contribute to the androgenic response in PCT cells. In the present study, we aimed to determine the molecular mechanisms that ultimately control KAP expression in these cells. Using several genetically deficient mouse models and different pharmacologic and hormonal treatments, we determined that thyroid and GH modulate CCAAT/enhancer binding protein α and β levels that, in turn, control KAP expression in PCT cells in a developmentally dependent manner. We demonstrated that these factors bind to sites in the proximal KAP promoter, thereby collaborating with androgens for full KAP expression. Finally, we propose that TH and GH, acting through CCAAT/enhancer binding protein, may constitute a general regulatory mechanism of androgen-dependent genes in mouse kidney. Copyright © 2006 by The Endocrine Society.
URIhttp://hdl.handle.net/10261/112524
DOI10.1210/me.2005-0229
Identificadoresdoi: 10.1210/me.2005-0229
issn: 0888-8809
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