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KMID : 0603820090150040349
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Journal of Experimental & Biomedical Science
2009 Volume.15 No. 4 p.349 ~ p.353
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Lysophosphatidic Acid Inhibits Nitric Oxide-induced Apoptosis via p70S6kinase Pathway in Rabbit Articular Chondrocytes
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Yu Seon-Mi
Kim Song-Ja
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Abstract
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Lysophosphatidic Acid (LPA) is a bioactive lysophospholipid that is a potent signaling molecule able to provoke a variety of cellular responses in many cell types such as differentiation, inflammation and apoptosis. In this study, we have investigated the effect of LPA on Nitric oxide (NO)-induced apoptosis in rabbit articular chondrocytes. LPA dramatically reduced NO induced apoptosis of chondrocytes determined by phase contrast microscope and MTT assay. When chondrocytes alone treated with LPA, LPA induced phosphorylation of p70S6kinase, a serine/threonine kinase that acts downstream of phosphatidylinositol 3,4,5-trisphosphate (PIP3) and phosphoinositide-dependent kinase-1 (PDK-1) in the PI3 kinase pathway, dose-dependently detected by Western blot analysis. Phosphorylation of p70S6k with LPA was reduced expression of p53 in NO- induced apoptosis of chondrocytes. Also, inhibition of p70S6kinase with rapamycin was enhanced expression of p53 in chondrocytes. Our findings collectively suggest that LPA regulates NO induced apoptosis through p70S6kinase pathway in rabbit articular chondrocytes.
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KEYWORD
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Chondrocyte, Lysophosphatidic Acid(LPA), Nitric oxide(NO), Apoptosis
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