The regulation of the activation of non phagocytic NADPH oxidase is poorly understood. Previously we demonstrated that in fibroblasts the exposure to WKYMVm induced p47phox phosphorylation and translocation and that these effects were mediated by ERKs activation. Protein kinase C (PKC) is reported to be involved in regulating the phosphorylation of NADPH oxidase components in polymorphonucleate cells stimulated via FPRL1 receptor, but its involvement in fibroblasts was not demonstrated. Therefore, we investigated in IMR90 cells exposed to WKYMVm the role of PKC isoenzymes in the activation of NADPH oxidase-like enzyme. Preincubation with general pharmacological inhibitors of PKC, before stimulation with WKYMVm, prevented the ERKs activation, p47phox phosphorylation and translocation. The analysis of cellular partitioning of PKC isoenzymes demonstrated that PKCa and PKCd translocated from the cytosolic to the membrane fraction upon stimulation with WKYMVm. Preincubation with Go6976 or with rottlerin prevented the phosphorylation and translocation of NADPH oxidase regulatory subunit.

PROTEIN KINASE C-ALPHA AND -DELTA ARE REQUIRED FOR NADPH OXIDASE ACTIVATION IN WKYMVm-STIMULATED IMR90 HUMAN FIBROBLASTS

MONTESANO GESUALDI, Nicola;AMMENDOLA, ROSARIO
2007

Abstract

The regulation of the activation of non phagocytic NADPH oxidase is poorly understood. Previously we demonstrated that in fibroblasts the exposure to WKYMVm induced p47phox phosphorylation and translocation and that these effects were mediated by ERKs activation. Protein kinase C (PKC) is reported to be involved in regulating the phosphorylation of NADPH oxidase components in polymorphonucleate cells stimulated via FPRL1 receptor, but its involvement in fibroblasts was not demonstrated. Therefore, we investigated in IMR90 cells exposed to WKYMVm the role of PKC isoenzymes in the activation of NADPH oxidase-like enzyme. Preincubation with general pharmacological inhibitors of PKC, before stimulation with WKYMVm, prevented the ERKs activation, p47phox phosphorylation and translocation. The analysis of cellular partitioning of PKC isoenzymes demonstrated that PKCa and PKCd translocated from the cytosolic to the membrane fraction upon stimulation with WKYMVm. Preincubation with Go6976 or with rottlerin prevented the phosphorylation and translocation of NADPH oxidase regulatory subunit.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11588/372213
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