Classical Xenopus laevis progesterone receptor associates to the plasma membrane through its ligand-binding domain

Silvana Martinez, Pamela Pastén, Karina Suarez, Andrea García, Francisco Nualart, Martín Montecino, María Victoria Hinrichs, Juan Olate

Resultado de la investigación: Contribución a una revistaArtículo

14 Citas (Scopus)

Resumen

During the last decade, considerable evidence is accumulating that supports the view that the classic progesterone receptor (xPR-1) is mediating Xenopus laevis oocyte maturation through a non-genomic mechanism. Overexpression and depletion of oocyte xPR-1 have been shown to accelerate and to block progesterone-induced oocyte maturation, respectively. In addition, rapid inhibition of plasma membrane adenylyl cyclase (AC) by the steroid hormone, supports the idea that xPR-1 should be localized at the oocyte plasma membrane. To test this hypothesis, we transiently transfected xPR-1 cDNA into Cos-7 cells and analyzed its subcellular distribution. Through Western blot and immunofluorescence analysis, we were able to detect xPR-1 associated to the plasma membrane of transfected Cos-7 cells. Additionally, using Progesterone-BSA-FITC, we identified specific progesterone-binding sites at the cell surface of xPR-1 expressing cells. Finally, we found that the receptor ligand-binding domain displayed membrane localization, in contrast to the N-terminal domain, which expressed in similar levels, remained cytosolic. Overall, these results indicate that a fraction of xPR-1 expressed in Cos-7 cells, associates to the plasma membrane through its LBD.

Idioma originalInglés
Páginas (desde-hasta)560-567
Número de páginas8
PublicaciónJournal of Cellular Physiology
Volumen211
N.º2
DOI
EstadoPublicada - may 2007

Áreas temáticas de ASJC Scopus

  • Bioquímica clínica
  • Biología celular
  • Fisiología

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