Original Article

Journal of Investigative Dermatology (1981) 77, 59–64; doi:10.1111/1523-1747.ep12479244

Phototoxicity Mechanisms: Chlorpromazine Photosensitized Damage to DNA and Cell Membranes

Irene E Kochevar

Department of Dermatology, Columbia University, New York, New York, U.S.A.

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Abstract

Photosensitized damage to biological molecules is the initial process in phototoxic responses. It is now recognized that many phototoxic compounds can photosensitize damage to more than one type of biological substrate. The in vitro light-initiated reactions of phototoxic compounds with DNA, soluble proteins and membrane components can be classified by their molecular mechanisms: (1) those in which an excited state of the photo-toxic compound (or an unstable species derived from it) reacts directly with the biological substrate and (2) those in which a molecule derived from the phototoxic compound (a photoproduct or an activated oxygen species) reacts with the biological substrate. This paper describes the mechanisms by which chlorpromazine photosensitizes damage to membranes, protein and DNA and compares them to the mechanisms of photosensitization by psoralens, porphyrins, dyes, and other molecules.

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