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Richard B. Stoughton, MD; Peter DeQuoy, BA; Joseph F. Walter, MD

Arch Dermatol. 1978;114(1):43-45.

Abstract
• Crude coal tar and a refined product, when they are combined with near ultraviolet (UV) light (UVA, 320-400 nm), depress DNA synthesis in vivo in normal and proliferating skin of the hairless mouse. Near ultraviolet light alone does not interfere with DNA synthesis, but coal tar without UVA does have an inhibitory effect on DNA synthesis of normal skin. This effect of coal tar without UVA is not as great as the effect of the combination of UVA and coal tar.

Between 0.9 and 1.6 joules/sq cm of UVA are required for its biologic effect on DNA synthesis in coal-tar-treated skin.

(Arch Dermatol 114:43-45, 1978)

Author Affiliations
From the Division of Dermatology, Scripps Clinic and Research Foundation, La Jolla, Calif (Dr Stoughton and Mr DeQuoy), and the University of California School of Medicine, San Diego (Dr Walter).

Footnotes
Accepted for publication Sept 14, 1977.

Reprint requests to 10666 N Torrey Pines Rd, La Jolla, CA 92037 (Dr Stoughton).

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