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Supplementary Figure 2 from A Smac Mimetic Rescue Screen Reveals Roles for Inhibitor of Apoptosis Proteins in Tumor Necrosis Factor-α Signaling

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posted on 2023-03-30, 17:50 authored by Alex Gaither, Dale Porter, Yao Yao, Jason Borawski, Guang Yang, Jerry Donovan, David Sage, Joanna Slisz, Mary Tran, Christopher Straub, Tim Ramsey, Vadim Iourgenko, Alan Huang, Yan Chen, Robert Schlegel, Mark Labow, Stephen Fawell, William R. Sellers, Leigh Zawel
Supplementary Figure 2 from A Smac Mimetic Rescue Screen Reveals Roles for Inhibitor of Apoptosis Proteins in Tumor Necrosis Factor-α Signaling

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ARTICLE ABSTRACT

Smac mimetic compounds targeting the inhibitor of apoptosis proteins (IAP) baculoviral IAP repeat-3 domain are presumed to reduce the threshold for apoptotic cell death by alleviating caspase-9 repression. We explored this tenet in an unbiased manner by searching for small interfering RNAs that are able to confer resistance to the Smac mimetic compound LBW242. Among the screening hits were multiple components of the tumor necrosis factor α (TNFα) signaling pathway as well as X-linked inhibitor of apoptosis (XIAP) itself. Here, we show that in a subset of highly sensitive tumor cell lines, activity of LBW242 is dependent on TNFα signaling. Mechanistic studies indicate that in this context, XIAP is a positive modulator of TNFα induction whereas cellular inhibitor of apoptosis protein 1 negatively regulates TNFα-mediated apoptosis. [Cancer Res 2007;67(24):11493–8]

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