Induction of cytosolic phospholipase A2 by oncogenic Ras in human non-small cell lung cancer.
Mutations in Ras family members that confer oncogenic potential are frequently observed in specific human cancers. We report that human non-small cell lung cancer (NSCLC) lines that harbor oncogenic mutations in Ki-Ras (H460, A549, H2122) synthesized high levels of prostaglandin E2 (PGE2) compared with NSCLC lacking Ras mutations or non-transformed lung epithelial cells (BEAS-2B). This increased PGE2 production was mediated by constitutively high expression of 85-kDa cytosolic phospholipase A2 ( cPLA2) and cyclooxygenase 2 ( COX-2). The increased expression of cPLA2 protein was mediated through elevated mRNA levels and activation of the cPLA2 promoter. Induction of cPLA2 promoter activity was blocked by expression of dominant-negative forms of Ras. Inhibition of Ras by the farnesyltransferase inhibitor BZA-5B inhibited prostaglandin synthesis in H2122 cells by decreasing expression of both cPLA2 and COX-2. Finally, inhibitors of eicosanoid synthesis blocked anchorage-independent growth of NSCLC lines exhibiting Ki-Ras mutations. These results identify cPLA2 as a novel Ras-inducible regulator of eicosanoid synthesis that participates in cellular transformation.[1]References
- Induction of cytosolic phospholipase A2 by oncogenic Ras in human non-small cell lung cancer. Heasley, L.E., Thaler, S., Nicks, M., Price, B., Skorecki, K., Nemenoff, R.A. J. Biol. Chem. (1997) [Pubmed]
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