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Journal Article
Research Support, U.S. Gov't, P.H.S.
Review
The apoptotic action of the retinoid CD437/AHPN: diverse effects, common basis.
Journal of Biomedical Science 2003 January
Retinoids, such as all-TRANS-retinoic acid (RA), have found applications in several different types of (cancer) therapies. The synthetic retinoid 6-[3-(1-adamantyl)-4-hydroxyphenyl]-2-naphthalene carboxylic acid (CD437 or AHPN), an RA receptor (RAR)gamma agonist, not only induces RARgamma-dependent differentiation, but in contrast to RA, it also induces RARgamma-independent apoptosis in many tumor cells. This observation makes this and similar new retinoids very interesting from a clinical perspective. Several genes have been associated with CD437/AHPN-mediated apoptosis, but the multiple activities of this compound and the apparent cell-type-specific responses to treatment have made it difficult to discern a common biochemical basis for the mechanism of its apoptotic action. In this brief review, we present a model which links all CD437/AHPN-associated apoptotic effects. CD437/AHPN rapidly induces DNA adduct formation through an as-yet unknown reaction which is independent of cell type. This is followed by a cell-type-specific, largely p53-independent DNA damage response which can result in engagement of multiple cell death pathways and activation of caspases as a common endpoint. At the same time, the RARgamma-dependent pathway leads to regulation of differentiation-associated, cell-type-specific genes. CD437/AHPN, with its simultaneous differentiation and apoptosis-inducing activities, is a good prototype for new drugs which may be clinically more efficacious than those with a single activity.
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