Regulation of Mammalian Target of Rapamycin Complex 1 by Bcl-2 and Bcl-XL Proteins |
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| Authors: | Huafei Zou Yumei Lai Xuwen Zhao Gonghong Yan Dongzhu Ma Nayra Cardenes Sruti Shiva Yongjian Liu Xiaochun Bai Yong Jiang Yu Jiang |
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| Affiliation: | From the ‡Department of Pharmacology and Chemical Biology and ;the ¶Vascular Medicine Institute, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania 15261 and ;the Departments of §Pathology and ;‖Cell Biology, School of Basic Medical Sciences, Southern Medical University, Guangzhou 510515, China |
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| Abstract: | Mammalian target of rapamycin complex 1 (mTORC1) is a key regulator of cell growth and metabolism. Its activity is controlled by various types of signals, including growth factors, nutrients, and stresses. In this study, we show that changes in expression levels of two antiapoptotic proteins, Bcl-2 and Bcl-XL, also affect mTORC1 signaling activity. In cells overexpressing Bcl-XL, mTORC1 activity is increased and becomes less sensitive to growth factor or nutrient conditions. In contrast, reduction in expression levels of the two antiapoptotic proteins inhibits mTORC1 signaling activity. Our results suggest that the effect of Bcl-2 and Bcl-XL on mTORC1 is mediated by FKBP38, an inhibitor of mTORC1. The two proteins compete with mTORC1 for FKBP38 binding and hence alter mTORC1 activity. This study reveals a novel cross-talk between Bcl-2/XL and mTORC1 signaling, which is likely to contribute to cancer development. |
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| Keywords: | Bcl-2 Mitochondria mTOR Complex (mTORC) S6 Kinase Signaling Bcl-XL FKBP38 mTORC1 |
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