Hydrogen peroxide activates focal adhesion kinase and c-Src by a phosphatidylinositol 3 kinase-dependent mechanism and promotes cell migration in Caco-2 cell monolayers
| Autor: | Parimal Sheth, Radhakrishna Rao, Ankur Seth, Mitzi Dunagan, Shyamali Basuroy |
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| Rok vydání: | 2010 |
| Předmět: |
Xanthine Oxidase
Time Factors Physiology Proto-Oncogene Proteins pp60(c-src) Phosphatidylinositol 3-Kinases Mitogen-activated protein kinase kinase Biology Xanthine Focal adhesion Mice chemistry.chemical_compound Cell Movement Mucosal Biology Physiology (medical) Animals Humans ASK1 Phosphatidylinositol Intestinal Mucosa Phosphorylation Protein Kinase Inhibitors Phosphoinositide-3 Kinase Inhibitors Dose-Response Relationship Drug Hepatology MAP kinase kinase kinase Akt/PKB signaling pathway Gastroenterology Hydrogen Peroxide Oxidants Vinculin Cell biology Enzyme Activation Oxidative Stress Protein Transport Crk-Associated Substrate Protein chemistry Focal Adhesion Kinase 1 Mutation Tyrosine RNA Interference Caco-2 Cells Paxillin Chickens Proto-Oncogene Proteins c-akt Signal Transduction Proto-oncogene tyrosine-protein kinase Src |
| Zdroj: | American Journal of Physiology-Gastrointestinal and Liver Physiology. 299:G186-G195 |
| ISSN: | 1522-1547 0193-1857 |
| DOI: | 10.1152/ajpgi.00368.2009 |
| Popis: | Recent studies showed that c-Src and phosphatidylinositol 3 (PI3) kinase mediate the oxidative stress-induced disruption of tight junctions in Caco-2 cell monolayers. The present study evaluated the roles of PI3 kinase and Src kinase in the oxidative stress-induced activation of focal adhesion kinase (FAK) and acceleration of cell migration. Oxidative stress, induced by xanthine and xanthine oxidase system, rapidly increased phosphorylation of FAK on Y397, Y925, and Y577 in the detergent-insoluble and soluble fractions and increased its tyrosine kinase activity. The PI3 kinase inhibitors, wortmannin and LY294002, and the Src kinase inhibitor, 4-amino-5[chlorophyll]-7-[t-butyl]pyrazolo[3–4-d]pyrimidine, attenuated tyrosine phosphorylation of FAK. Oxidative stress induced phosphorylation of c-Src on Y418 by a PI3 kinase-dependent mechanism, whereas oxidative stress-induced activation of PI3 kinase was independent of Src kinase activity. Hydrogen peroxide accelerated Caco-2 cell migration in a concentration-dependent manner. Promotion of cell migration by hydrogen peroxide was attenuated by LY294002 and PP2. Reduced expression of FAK by siRNA attenuated hydrogen peroxide-induced acceleration of cell migration. The expression of constitutively active c-SrcY527Fenhanced cell migration, whereas the expression of dominant negative c-SrcK296R/Y528Fattenuated hydrogen peroxide-induced stimulation of cell migration. Oxidative stress-induced activation of c-Src and FAK was associated with a rapid increase in the tyrosine phosphorylation and the levels of paxillin and p130CASin actin-rich, detergent-insoluble fractions. This study shows that oxidative stress activates FAK and accelerates cell migration in an intestinal epithelium by a PI3 kinase- and Src kinase-dependent mechanism. |
| Databáze: | OpenAIRE |
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