The Adaptor Protein p66Shc Inhibits mTOR-Dependent Anabolic Metabolism
Author(s)Lamming, Dudley W.; Soliman, Mohamed A.; Abdel Rahman, Anas M.; Birsoy, Kivanc; Pawling, Judy; Frigolet, Maria E.; Lu, Huogen; Fantus, I. George; Pasculescu, Adrian; Zheng, Yong; Dennis, James W.; Pawson, Tony; Sabatini, David; ... Show more Show less
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Adaptor proteins link surface receptors to intracellular signaling pathways and potentially control the way cells respond to nutrient availability. Mice deficient in p66Shc, the most recently evolved isoform of the Shc1 adaptor proteins and a mediator of receptor tyrosine kinase signaling, display resistance to diabetes and obesity. Using quantitative mass spectrometry, we found that p66Shc inhibited glucose metabolism. Depletion of p66Shc enhanced glycolysis and increased the allocation of glucose-derived carbon into anabolic metabolism, characteristics of a metabolic shift called the Warburg effect. This change in metabolism was mediated by the mammalian target of rapamycin (mTOR) because inhibition of mTOR with rapamycin reversed the glycolytic phenotype caused by p66Shc deficiency. Thus, unlike the other isoforms of Shc1, p66Shc appears to antagonize insulin and mTOR signaling, which limits glucose uptake and metabolism. Our results identify a critical inhibitory role for p66Shc in anabolic metabolism.
DepartmentMassachusetts Institute of Technology. Department of Biology; Whitehead Institute for Biomedical Research; Koch Institute for Integrative Cancer Research at MIT
American Association for the Advancement of Science (AAAS)
Soliman, M. A., A. M. Abdel Rahman, D. W. Lamming, K. Birsoy, J. Pawling, M. E. Frigolet, H. Lu, et al. “The Adaptor Protein p66Shc Inhibits mTOR-Dependent Anabolic Metabolism.” Science Signaling 7, no. 313 (February 18, 2014): ra17–ra17.
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