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Wong, So C; Cheng, Weijun; Hamilton, Holly; Nicholas, Anthony L; Wakefield, Darren H; Almeida, Aaron; Blokhin, Andrei V; Carlson, Jeffrey; Neal, Zane C; Subbotin, Vladimir; Zhang, Guofeng; Hegge, Julia; Bertin, Stephanie; Trubetskoy, Vladimir S; Rozema, David B; Lewis, David L; Kanner, Steven B
Molecular cancer therapeutics, 01/2018, Volume: 17, Issue: 1Journal Article
Targeted therapy against VEGF and mTOR pathways has been established as the standard-of-care for metastatic clear cell renal cell carcinoma (ccRCC); however, these treatments frequently fail and most patients become refractory requiring subsequent alternative therapeutic options. Therefore, development of innovative and effective treatments is imperative. About 80%-90% of ccRCC tumors express an inactive mutant form of the von Hippel-Lindau protein (pVHL), an E3 ubiquitin ligase that promotes target protein degradation. Strong genetic and experimental evidence supports the correlate that pVHL functional loss leads to the accumulation of the transcription factor hypoxia-inducible factor 2α (HIF2α) and that an overabundance of HIF2α functions as a tumorigenic driver of ccRCC. In this report, we describe an RNAi therapeutic for HIF2α that utilizes a targeting ligand that selectively binds to integrins αvβ3 and αvβ5 frequently overexpressed in ccRCC. We demonstrate that functional delivery of a HIF2α-specific RNAi trigger resulted in HIF2α gene silencing and subsequent tumor growth inhibition and degeneration in an established orthotopic ccRCC xenograft model. .
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