BBS Faculty Member - Liron Bar-Peled

Liron Bar-Peled

Assistant Professor of Medicine

Massachusetts General Hospital East
MGH Cancer Center, Room 7-221
CNY 149, 13th Street
Charlestown, MA 02129
Tel: 617-726-5620
Fax: 617-724-9648
Email: lbar-peled@mgh.harvard.edu
Visit my lab page here.



Cancer cells display remarkable plasticity allowing them to adapt to ever changing environments. A key feature of this plasticity is their ability to rewire core metabolic networks to provide a steady source of energy and building blocks needed for rapid growth. This demand for energy produces byproducts including reactive oxygen species (ROS) that alter the function of proteins, DNA and lipids, and if left unchecked, result in oxidative stress and impairs cancer cell viability. We now appreciate that ROS and other reactive metabolites are not just static entities within a cell, but represent dynamic signaling molecules that alter cellular and organismal physiology. Despite decades of research, we know surprisingly little about ROS sensing and signaling and how this class of molecules regulates protein function within the cell. Our long term goals are to understand how cells respond to altered metabolic states and to pharmacologically modulate these pathways in diseases where they are deregulated.

The NRF2/KEAP1 pathway functions as the master regulator of the cellular anti-oxidant response and is deregulated in a large number of cancers. Our studies focus on understanding how deregulation of this pathway promotes the proliferation of lung cancers where this pathway is commonly mutated. Towards this end, we have identified that NRF2 can regulate protein function independently of its control of protein expression. Research in our lab aims to identify how this NRF2-mediated redox regulation alters cellular function as well as the identification of new regulators of this pathway using proteomic and genomic methodologies.

While major drivers of oncogenic proliferation have been identified, modulators of these core pathways which are required for cancer proliferation are still being discovered. Our research seeks to identify these 'co-dependecies' and small molecule inhibitors that can regulate their function. Unhindered by the conventional notions of what proteins are considered druggable we employ Protein Druggability Mapping (PDM), a chemical proteomic platform that allows us to identify these co-dependencies and corresponding inhibitors for them. One particular focus for our group is transcription factor (TF) signaling pathways that respond to altered metabolic states. These pathways represent a diverse class of proteins that underlie basic physiological process and are often hijacked by multiple cancers, becoming indispensable for their proliferation. In contrast to their kinase counterparts, most TF pathways are difficult to pharmacologically modulate, representing not only a dearth in potential therapeutic options but also an incomplete understanding of their biological functions and regulation of metabolic and stress pathways. Using PDM we have identified multiple druggable proteins within TF pathways regulating stress and metabolic networks upregulated in cancer. Current studies are centered on elucidating their functions and developing potent inhibitors for these transcriptional and metabolic targets.



Last Update: 8/5/2020



Publications

a. Bar-Peled L.*#, Kemper E. K*., Suciu R. M, Vinogradova E. V., Backus K. M., Horning B. D., Paul T. A., Ichu T-A., Svensson R. U., Olucha J., Chang M. W., Kok B. P., Zhou Z., Ihle N., Dix M. M., Hayward M., Jiang P., Saez E., Shaw R. J., and Cravatt B. F.# (2017). Chemical Proteomics Identifies Druggable Vulnerabilities in a Genetically Defined Cancer. Cell 171: 696-709.

b. Bar-Peled L.*,Chantranupong L.*, Cherniack A. D., Chen W. W., Ottina K. A., Grabiner, Spear E. A., Carter S. L., Meyerson M. L., and Sabatini D. M. (2013). A tumor suppressor complex with GAP activity for the Rag GTPases that signal amino acid sufficiency to mTORC1. Science 340: 1100-1106.
c. Bar-Peled L., Schwietzer L. D., Zoncu R., and Sabatini D.M. Ragulator is a GEF for the Rag GTPases that signal amino acid levels to mTORC1 (2012). Cell 150: 1196-1208.

d. Sancak, Y.*, Bar-Peled, L.*, Zoncu, R., Markhard, A.L., Nada, S. and Sabatini, D.M. (2010) Ragulator-Rag Complex Targets mTORC1 to the Lysosomal Surface and Is Necessary for Its Activation by Amino Acids. Cell 141: 290-303.

*These authors contributed equally to this work
#Co-corresponding authors



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