Expedient Synthesis of Highly Potent Antagonists of Inhibitor of Apoptosis Proteins (IAPs) with Unique Selectivity for ML-IAP

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• 作者：Mitchell Vamos ; Kate Welsh ; Darren Finlay ; Pooi San Lee ; Peter D. Mace ; Scott J. Snipas ; Monica L. Gonzalez ; Santhi Reddy Ganji ; Robert J. Ardecky ; Stefan J. Riedl ; Guy S. Salvesen ; Kristiina Vuori ; John C. Reed ; Nicholas D. P. Cosford
• 刊名：ACS Chemical Biology
• 出版年：2013
• 出版时间：April 19, 2013
• 年：2013
• 卷：8
• 期：4
• 页码：725-732
• 全文大小：562K
• 年卷期：v.8,no.4(April 19, 2013)
• ISSN：1554-8937

文摘

A series of novel, potent antagonists of the inhibitor of apoptosis proteins (IAPs) were synthesized in a highly convergent and rapid fashion (鈮? steps) using the Ugi four-component reaction as the key step, thus enabling rapid optimization of binding potency. These IAP antagonists compete with caspases 3, 7, and 9 for inhibition by X chromosome-linked IAP (XIAP) and bind strongly (nanomolar binding constants) to several crucial members of the IAP family of cancer pro-survival proteins to promote apoptosis, with a particularly unique selectivity for melanoma IAP (ML-IAP). Experiments in cell culture revealed powerful cancer cell growth inhibitory activity in multiple (breast, ovarian, and prostate) cell lines with single agent toxicity at low nanomolar levels against SKOV-3 human ovarian carcinoma cells. Administration of the compounds to human foreskin fibroblast cells revealed no general toxicity to normal cells. Furthermore, computational modeling was performed, revealing key contacts between the IAP proteins and antagonists, suggesting a structural basis for the observed potency.