Inhibition of ultraviolet-B epidermal ornithine decarboxylase induction and skin carcinogenesis in hairless mice by topical indomethacin and triamcinolone acetonide

Journal Article · Fri Oct 01 00:00:00 EDT 1982 · Cancer Res.; (United States)

OSTI ID:6852921

Lowe, N J; Connor, M J; Breeding, J; Chalet, M

Modulation of ultraviolet-B (UVB) skin carcinogenesis by topical treatment with two antiinflammatory drugs expected to have different mechanisms of action has been studied in the hairless mouse. Indomethacin is a nonsteroidal antiinflammatory agent which may act by inhibiting prostaglandin biosynthesis. Triamcinolone acetonide is a steroidal antiinflammatory agent. Both of these drugs inhibited the induction of epidermal ornithine decarboxylase by UVB when applied topically in a acetone vehicle. A UVB skin tumor study was designed. Groups of mice were irradiated daily with UVB for 20 days, each mouse receiving a total of 17.1 kJ UVB per sq m. Group 1 was treated with acetone immediately after each irradiation; Group 2 received 700 nmol indomethacin in acetone immediately after each irradiation; Group 3 received 14.4 nmol triamcinolone acetonide in acetone immediately after each irradiation. Mice were killed after 52 weeks, and the tumors were excised and examined histologically. Both topical indomethacin and topical triamcinolone acetonide were effective in reducing the incidence and size of the skin tumors induced by UVB. This evidence supports the hypothesis that the induction of ornithine decarboxylase may be a critical component of UVB skin carcinogenesis and that inhibition of ornithine decarboxylase induction can be used as a screen for agents which will inhibit UVB skin carcinogenesis.

• Research Organization: Department of Medicine, UCLA Medical School
• OSTI ID: 6852921
• Journal Information: Cancer Res.; (United States), Vol. 42:10
• Country of Publication: United States
• Language: English

Related Subjects

63 RADIATION, THERMAL, AND OTHER ENVIRON. POLLUTANT EFFECTS ON LIVING ORGS. AND BIOL. MAT.
59 BASIC BIOLOGICAL SCIENCES
ANTIPYRETICS
RADIOSENSITIVITY EFFECTS
SKIN
BIOLOGICAL RADIATION EFFECTS
CARCINOGENESIS
DECARBOXYLASES
MICE
ORNITHINE
RADIATION DOSES
ULTRAVIOLET RADIATION
AMINO ACIDS
ANIMALS
BIOLOGICAL EFFECTS
BODY
CARBON-CARBON LYASES
CARBOXY-LYASES
CARBOXYLIC ACIDS
CENTRAL NERVOUS SYSTEM DEPRESSANTS
DOSES
DRUGS
ELECTROMAGNETIC RADIATION
ENZYMES
LYASES
MAMMALS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANS
PATHOGENESIS
RADIATION EFFECTS
RADIATIONS
RODENTS
VERTEBRATES
560152* - Radiation Effects on Animals- Animals
550900 - Pathology