Bioactivation of drugs in the skin: relationship to cutaneous adverse drug reactions
2014
AbstractDrug-induced skin rashes are poorly understood idiosyncratic reactions, and current methods cannot predict their occurrence. Most idiosyncratic drug reactions are thought to be caused by chemically reactive metabolites, and the skin is a frequent site of idiosyncratic reactions; however, the skin has a very limited capacity to metabolize drugs. To balance this, the skin represents a protective barrier with a very active immune response against pathogens and other types of skin injury. Therefore its response to reactive metabolites is quite different from that of the liver. The purpose of this review is to integrate emerging findings into proposed mechanisms of drug and carcinogen metabolism in the skin that are likely responsible for rashes and other immune responses of the skin. Current evidence suggests the skin possesses significant sulfotransferase and flavin monooxygenases activities, but very low cytochromes P450 activity. However, there are skin-specific P450s that are not present in the li...
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