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. 1987 Dec;76:89–95. doi: 10.1289/ehp.877689

Role of protein kinase C in regulation of gene expression and relevance to tumor promotion.

M D Johnson 1, G M Housey 1, C A O'Brian 1, P T Kirschmeier 1, I B Weinstein 1
PMCID: PMC1474480  PMID: 2452080

Abstract

The tumor promoter 12-O-tetradecanoylphorbol-13-acetate (TPA) has highly pleiotropic effects on cells in culture and on tissues in vivo, including effects on protein kinase C (PKC) activation and gene expression. In order to determine the mechanism of activation of gene transcription by TPA, DNA sequences whose transcription is modulated in cells undergoing a mitogenic response to TPA were isolated by differential screening of a cDNA library from TPA-treated cells. TPA-S1 corresponds to an mRNA species whose abundance is increased within 1 hr of exposure of quiescent C3H 10T1/2 mouse embryo fibroblasts. TPA-R1 corresponds to an mRNA species whose abundance is decreased in TPA-treated cells. The induction of TPA-S1 is blocked by actinomycin D and is specific for phorbol esters with tumor-promoting activity. The transcription of this sequence is not induced by cycloheximide, nor is there an enhancement of the TPA response. Several lines of evidence demonstrate that PKC activation plays a critical role in the regulation of TPA-S1 expression. The nucleotide and predicted amino acid sequence of TPA-S1 exhibits homology with sequences representing a peptide with erythroid-potentiating activity, a metalloproteinase inhibitor protein, and a murine protein with beta-interferon-like activity. The role of TPA-S1 in tumor promotion is suggested by the expression of this sequence in mouse skin carcinomas induced by dimethyl-benzanthracene-TPA treatment, but not in papillomas or in control tissue. The consideration of signal transduction pathways may be useful in the design of short-term risk assessment assays for agents that act as tumor promoters.

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Selected References

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