Inhibitor of Apoptosis (IAP) proteins as therapeutic targets for radiosensitization of human cancers

Cancer Treatment Reviews
Simone Fulda

Abstract

Radiotherapy initiates a variety of signaling events in cancer cells that eventually lead to cell death in case the DNA damage cannot be repaired. However, the signal transduction pathways that mediate cell death in response to radiation-inflicted DNA damage are frequently disturbed in human cancers, contributing to radioresistance. For example, aberrant activation of antiapoptotic programs such as high expression of Inhibitor of Apoptosis (IAP) proteins has been shown to interfere with the efficacy of radiotherapy. Since IAP proteins have been linked to radioresistance in several malignancies, therapeutic targeting of IAP proteins may open new perspectives to overcome radioresistance. Therefore, molecular targeting of IAP proteins may provide novel opportunities to reactivate cell death pathways that mediate radiation-induced cytotoxicity. A number of strategies have been developed in recent years to antagonize IAP proteins for the treatment of cancers. Some of these approaches have already been translated into a clinical application. While IAP protein-targeting agents are currently being evaluated in early clinical trials alone or in combination with conventional chemotherapy, they have not yet been tested in combination with...Continue Reading

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