title: Nicotinamide and nicotinamide analogues as antitumor promoters in mouse skin.
abstract: Phorbol ester-induced promotion of initiated NMRI mouse skin keratinocytes to papillomas could be largely prevented when nicotinamide-like inhibitors of poly(ADP-ribose)polymerase (nicotinamide, benzamide, 3-aminobenzamide) were applied simultaneously with 12-O-tetradecanoylphorbol-13-acetate (TPA). A similar suppression of tumor promotion by nicotinamide analogues was demonstrated in clone 41 JB6 epidermal cells which are promotable by TPA to anchorage-independent growth. The antipromotion effect of nicotinamide analogues, however, does not appear to come about by an inhibition of poly(ADP-ribose)polymerase. Acid analogues of nicotinamide, such as benzoic acid or 3-aminobenzoic acid which do not inhibit the polymerase, showed antipromotion activity similar to that of their corresponding amides. It could also be ruled out that these antipromoters mediate their effect on keratinocytes by a cytostatic action, by scavenging the promoter TPA in a chemical reaction, or by inhibiting protein kinase C. In initiated mouse skin, nicotinamide analogues strongly suppressed TPA-induced accumulation of inflammatory cells and vascular permeability, while epidermal hyperplasia was not significantly affected.
authors: Institut für Physiologische Chemie, Universität Hamburg, Federal Republic of Germany.
authors: A
authors: A
authors: Ludwig
authors: M
authors: M
authors: Dietel
authors: G
authors: G
authors: Schäfer
authors: K
authors: K
authors: Müller
authors: H
authors: H
authors: Hilz
mesh_terms: D015127:9,10-Dimethyl-1,2-benzanthracene; D062365:Aminobenzoates / Q000494:pharmacology / Q000627:therapeutic use; D000818:Animals; D000970:Antineoplastic Agents; D001549:Benzamides / Q000494:pharmacology / Q000627:therapeutic use; D001565:Benzoates / Q000494:pharmacology / Q000627:therapeutic use; D019817:Benzoic Acid; D002455:Cell Division / Q000187:drug effects; D002999:Clone Cells; D004261:DNA Replication / Q000187:drug effects; D005260:Female; D015603:Keratinocytes / Q000187:drug effects / Q000473:pathology; D007700:Kinetics; D051379:Mice; D008815:Mice, Inbred Strains; D009536:Niacinamide / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use*; D010212:Papilloma / Q000139:chemically induced / Q000517:prevention & control*; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D012867:Skin / Q000187:drug effects / Q000473:pathology; D012878:Skin Neoplasms / Q000139:chemically induced / Q000517:prevention & control*; D013755:Tetradecanoylphorbol Acetate / Q000633:toxicity*; D062368:meta-Aminobenzoates
chemical_list: D062365:Aminobenzoates; D000970:Antineoplastic Agents; D001549:Benzamides; D001565:Benzoates; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; D062368:meta-Aminobenzoates; D009536:Niacinamide; D015127:9,10-Dimethyl-1,2-benzanthracene; C037689:benzamide; C025160:3-aminobenzamide; D019817:Benzoic Acid; C044855:3-aminobenzoic acid; D013755:Tetradecanoylphorbol Acetate