Possible involvement of protein kinase C and calcium ion in growth factor-induced expression of c-myc oncogene in Swiss 3T3 fibroblasts

K. Kaibuchi, T. Tsuda, A. Kikuchi, T. Tanimoto, T. Yamashita, Y. Takai

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Abstract

The addition of platelet-derived growth factor and fibroblast growth factor to quiescent cultures of Swiss 3T3 fibroblasts rapidly induced protein kinase C activation and Ca2+ mobilization and afterwards markedly increased c-myc mRNA levels. 1-Oleoyl-2-acetyl-glycerol, a membrane-permeable synthetic diacylglycerol, and 12-O-tetradecanoylphorbol 13-acetate, a tumor-promoting phorbol ester, stimulated protein kinase C activation without Ca2+ mobilization. Inversely, Ca2+ ionophores, A23187 and ionomycin, elicited Ca2+ mobilization without protein kinase C activation. Both protein kinase C-activating and Ca2+-mobilizing agents were able to increase c-myc mRNA levels in an additive manner. Prolonged treatment of the cells with phorbol 12,13-dibutyrate, another protein kinase C-activating phorbol ester, led to the down-regulation and complete disappearance of protein kinase C. In these cells, 1-oleoyl-2-acetylglycerol and 12-O-tetradecanoylphorbol 13-acetate did not increase c-myc mRNA levels, but platelet-derived growth factor, fibroblast growth factor, and the Ca2+ ionophores, all of which still induced Ca2+ mobilization, stimulated the increase of c-myc mRNA levels. These results strongly suggest that both protein kinase C and Ca2+ may be involved in platelet-derived growth factor- as well as fibroblast growth factor-induced expression of the c-myc oncogene in Swiss 3T3 cells.

Original languageEnglish
Pages (from-to)1187-1192
Number of pages6
JournalJournal of Biological Chemistry
Volume261
Issue number3
Publication statusPublished - 1986
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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