Okadaic acid and phorbol esters: comparative effects of these tumor promoters on cell transformation, intercellular communication and differentiation in vitro

Japanese Journal of Cancer Research : Gann
F KatohH Yamasaki

Abstract

Okadaic acid is a non-12-O-tetradecanoylphorbol-13-acetate (TPA)-type tumor promoter in the mouse skin carcinogenesis system. Here we report on the in vitro activity of okadaic acid in 3 assay systems: BALB/c 3T3 cell transformation, gap junctional intercellular communication (GJIC) in various cell types, and inhibition of induction of differentiation of Friend virus-transformed murine erythroleukemia (MEL) cells. The activity of okadaic acid was compared to that of the phorbol ester tumor promoters TPA and phorbol-12,13-didecanoate (PDD). In a test system involving a 2-week exposure of BALB/c 3T3 cells following 3-methylcholanthrene initiation, okadaic acid at a concentration of 10 ng/ml was equipotent to PDD as a promoter of cell transformation (4.9 and 3.7 foci/dish, respectively). Longer exposures to okadaic acid resulted in cytotoxicity. Okadaic acid-generated as well as PDD-generated transformed foci displayed a selective lack of GJIC between focus cells and surrounding normal cells, i.e., transformed cells communicate among themselves but not with surrounding cells. However, in contrast to TPA, there was no inhibition by okadaic acid, except at toxic doses, of homologous GJIC in BALB/c 3T3 cells or human and mouse kerati...Continue Reading

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Citations

Oct 1, 1995·Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association·C W SheuJ K Lee
Apr 1, 1994·Toxicology in Vitro : an International Journal Published in Association with BIBRA·C G RogersI Langlois
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Oct 16, 2007·Toxicology in Vitro : an International Journal Published in Association with BIBRA·Lin AoJia Cao
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Jul 23, 2011·Alternatives to Laboratory Animals : ATLA·Damien BrehenyStephen P Faux
Aug 23, 1993·Biochimica Et Biophysica Acta·G Walter, M Mumby

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