Your browser doesn't support javascript.
loading
Regulation of MAP kinase by calcium-sensing receptor in bovine parathyroid and CaR-transfected HEK293 cells.
Kifor, O; MacLeod, R J; Diaz, R; Bai, M; Yamaguchi, T; Yao, T; Kifor, I; Brown, E M.
Afiliación
  • Kifor O; Endocrine-Hypertension Division and Membrane Biology Program, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
Am J Physiol Renal Physiol ; 280(2): F291-302, 2001 Feb.
Article en En | MEDLINE | ID: mdl-11208605
Regulation of the extracellular signal-regulated kinase 1 and 2 (ERK1/2) pathway by the extracellular calcium (Ca2+o)-sensing receptor (CaR) was investigated in bovine parathyroid and CaR-transfected human embryonic kidney (HEKCaR) cells. Elevating Ca2+o or adding the selective CaR activator NPS R-467 elicited rapid, dose-dependent phosphorylation of ERK1/2. These phosphorylations were attenuated by pretreatment with pertussis toxin (PTX) or by treatment with the phosphotyrosine kinase (PTK) inhibitors genistein and herbimycin, the phosphatidylinositol-specific phospholipase C (PI-PLC) inhibitor U-73122, or the protein kinase C (PKC) inhibitor GF109203X and were enhanced by the PKC activator phorbol 12-myristate 13-acetate. Combined treatment with PTX and inhibitors of both PKC and PTK nearly abolished high Ca2+o-evoked ERK1/2 activation in HEKCaR cells, demonstrating CaR-mediated coupling via both Gq and G(i). High Ca2+o increased serine phosphorylation of the 85-kDa cytosolic phospholipase A2 (cPLA2) in both parathyroid and HEKCaR cells. The selective mitogen-activated protein kinase (MAPK) inhibitor PD98059 abolished high-Ca2+o)-induced ERK1/2 activation and reduced cPLA2 phosphorylation in both cell types, documenting MAPK's role in cPLA2 activation. Thus our data suggest that the CaR activates MAPK through PKC, presumably through Gq/11-mediated activation of PI-PLC, as well as through G(i)- and PTK-dependent pathway(s) in bovine parathyroid and HEKCaR cells and indicate the importance of MAPK in cPLA2 activation.
Asunto(s)
Buscar en Google
Añadir a Mi BVS
Imprimir
XML
PubMed Links

Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glándulas Paratiroides / Calcio / Receptores de Superficie Celular / Proteína Quinasa 1 Activada por Mitógenos / Proteínas Quinasas Activadas por Mitógenos / Sistema de Señalización de MAP Quinasas / Riñón Límite: Animals / Humans Idioma: En Revista: Am J Physiol Renal Physiol Asunto de la revista: FISIOLOGIA / NEFROLOGIA Año: 2001 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos
Buscar en Google
Añadir a Mi BVS
Imprimir
XML
PubMed Links

Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Glándulas Paratiroides / Calcio / Receptores de Superficie Celular / Proteína Quinasa 1 Activada por Mitógenos / Proteínas Quinasas Activadas por Mitógenos / Sistema de Señalización de MAP Quinasas / Riñón Límite: Animals / Humans Idioma: En Revista: Am J Physiol Renal Physiol Asunto de la revista: FISIOLOGIA / NEFROLOGIA Año: 2001 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos