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Abstract
Hye Jin Jung1, Joong Sup Shim1, JiYong Lee1, Young Mi Song1, Ki Chung Park1, Seung Hoon Choi1, Nam Doo Kim2, Jeong Hyeok Yoon2, Paul T. Mungai3, Paul T. Schumacker3 and Ho Jeong Kwon1,*
1 Yonsei University, Korea, Republic of;
2 Equispharm Inc., Korea, Republic of;
3 Northwestern University, United States
* Corresponding author
Abstract
Cellular oxygen sensing is required for hypoxia-inducible factor-1α (HIF-1α) stabilization, which is important for tumor cell survival, proliferation and angiogenesis. Here we find that terpestacin, a small molecule previously identified in a screen of microbial extracts, binds to the 13.4 kDa subunit (UQCRB) of mitochondrial Complex III, resulting in inhibition of hypoxia-induced ROS generation. Consequently, such inhibition blocks HIF activation and tumor angiogenesis in vivo, without inhibiting mitochondrial respiration. Overexpression of UQCRB or its suppression using RNA interference demonstrates that it plays a crucial role in the oxygen sensing mechanism that regulates responses to hypoxia. These findings provide a novel molecular basis of terpestacin targeting UQCRB of Complex III in selective suppression of tumor progression.
Drug action, Hypoxia, Mitochondria, Reactive oxygen species (ROS), Tumor metastases, Electron transport chain, Hypoxia-inducible factor, Terpestacin, Tumor angiogenesis, UQCRB of Complex III
Footnotes
Received November 24, 2009.
Accepted February 9, 2010.
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