Abstract:
:Three okadaic acid class tumor promoters, okadaic acid, dinophysistoxin-1, and calyculin A, have potent tumor-promoting activity in two-stage carcinogenesis experiments on mouse skin. DNA isolated from tumors induced by 7,12-dimethylbenz[a]anthracene (DMBA) and each of these tumor promoters revealed the same mutation at the second nucleotide of codon 61 (CAA----CTA) in the c-Ha-ras gene, determined by the polymerase chain reaction procedure and DNA sequencing. Three potent 12-O-tetradecanoylphorbol-13-acetate (TPA)-type tumor promoters, TPA, teleocidin, and aplysiatoxin, showed the same effects. These results provide strong evidence that this mutation in the c-Ha-ras gene is due to a direct effect of DMBA rather than a selective effect of specific tumor promoters.
journal_name
Mol Carcinogjournal_title
Molecular carcinogenesisauthors
Fujiki H,Suganuma M,Yoshizawa S,Kanazawa H,Sugimura T,Manam S,Kahn SM,Jiang W,Hoshina S,Weinstein IBdoi
10.1002/mc.2940020403subject
Has Abstractpub_date
1989-01-01 00:00:00pages
184-7issue
4eissn
0899-1987issn
1098-2744journal_volume
2pub_type
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