A role for survivin in chemoresistance of endothelial cells mediated by VEGF

Proceedings of the National Academy of Sciences of the United States of America
Jennifer TranRobert S Kerbel

Abstract

Although standard anticancer chemotherapeutic drugs have been designed to inhibit the survival or growth of rapidly dividing tumor cells, it is possible to enhance the efficacy of such drugs by targeting the proliferating host endothelial cells (ECs) of the tumor vasculature. A theoretical advantage of this strategy lies in the possibility of circumventing, or significantly delaying, acquired drug resistance driven by the genetic instability of tumor cells. Here, we show that both vascular endothelial growth factor (VEGF) and basic fibroblast growth factor significantly reduce the pro-apoptotic potency of chemotherapy on both micro- and macrovascular ECs. This cytoprotection to drug toxicity was found to be phosphatidylinositol 3-kinase-dependent and could be recapitulated in the absence of VEGF by overexpressing the dominant-active form of the serine/threonine kinase protein kinase B/Akt. Downstream of phosphatidylinositol 3-kinase, we also show that survivin plays a pivotal role in VEGF-mediated EC protection by preserving the microtubule network. In this respect, its induction effectively protects ECs against chemotherapeutic damage, whereas overexpression of its dominant-interfering mutant (C84A) abrogates the protective ef...Continue Reading

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