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. 1990 May;87(9):3373–3377. doi: 10.1073/pnas.87.9.3373

Persistent induction of cyclooxygenase in p60v-src-transformed 3T3 fibroblasts.

J W Han 1, H Sadowski 1, D A Young 1, I G Macara 1
PMCID: PMC53902  PMID: 2159148

Abstract

A BALB/c 3T3 cell line infected with the temperature-sensitive Rous sarcoma virus strain LA90 has been used to investigate early, p60v-src-dependent changes in gene expression (protein synthesis). Giant two-dimensional electrophoresis, which can resolve greater than 3000 polypeptides from [35S]methionine-labeled cell lysates, was used to detect the induction of a p72-74 (72-74 kDa) doublet (pI 7.5) after activation of p60v-src at 35 degrees C. Antiserum against cyclooxygenase (prostaglandin synthase or prostaglandin endoperoxide synthase) specifically immunoprecipitated the p72-74 doublet. The p72-74 doublet was also induced by platelet-derived growth factor and by phorbol 12-myristate 13-acetate and was elevated in an NIH 3T3 cell line transformed by wild-type src. Activation of p60v-src caused a persistent increase in p72-74, whereas the effect of the growth factor was transient. These dissimilar kinetics of induction were paralleled by changes in cyclooxygenase activity. Down-regulation of protein kinase C inhibited subsequent induction of cyclooxygenase by phorbol myristate acetate but did not block induction by p60v-src. The glucocorticoid agonist dexamethasone inhibited induction of cyclooxygenase by p60v-src. Although induction of this enzyme may not be directly involved in transformation, the data support the view that oncogenic transformation may result, not from expression of transformation-specific genes, but from persistent changes in the expression of genes normally induced only transiently during passage from the G0 stage of the cell cycle.

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