BCL-2 Inhibition Targets Oxidative Phosphorylation and Selectively Eradicates Quiescent Human Leukemia Stem Cells

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• 作者：Eleni D. Lagadinou¹ ; Alexander Sach¹ ; Kevin Callahan¹ ; Randall M. Rossi¹ ; Sarah J. Neering¹ ; Mohammad Minhajuddin¹ ; John M. Ashton¹ ; Shanshan Pei¹ ; ³ ; Valerie Grose¹ ; Kristen M. O&rsquo ; Dwyer¹ ; ² ; Jane L. Liesveld¹ ; ² ; Paul S. Brookes⁴ ; Michael W. Becker¹ ; ² ; Craig T. Jordan¹ ; ² ; ³ ; ^{craig_jordan@urmc.rochester.edu}
• 刊名：Cell Stem Cell
• 出版年：2013
• 出版时间：7 March, 2013
• 年：2013
• 卷：12
• 期：3
• 页码：329-341
• 全文大小：1530 K

文摘

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Summary

Most forms of chemotherapy employ mechanisms involving induction of oxidative stress, a strategy that can be effective due to the elevated oxidative state commonly observed in cancer cells. However, recent studies have shown that relative redox levels in primary tumors can be heterogeneous, suggesting that regimens dependent on differential oxidative state may not be uniformly effective. To investigate this issue in hematological malignancies, we evaluated mechanisms controlling oxidative state in primary specimens derived from acute myelogenous leukemia (AML) patients. Our studies demonstrate three striking findings. First, the majority of functionally defined leukemia stem cells (LSCs) are characterized by relatively low levels of reactive oxygen species (termed ¡°ROS-low¡±). Second, ROS-low LSCs aberrantly overexpress BCL-2. Third, BCL-2 inhibition reduced oxidative phosphorylation and selectively eradicated quiescent LSCs. Based on these findings, we propose a model wherein the unique physiology of ROS-low LSCs provides an opportunity for selective targeting via disruption of BCL-2-dependent oxidative phosphorylation.