transmembrane inhibitor of rictor/mtorc2 in hematopoietic progenitors
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ID: 179359
2014
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Abstract
Central to cellular proliferative, survival, and metabolic responses is the serine/threonine kinase mTOR, which is activated in many human cancers. mTOR is present in distinct complexes that are either modulated by AKT (mTORC1) or are upstream and regulatory of it (mTORC2). Governance of mTORC2 activity is poorly understood. Here, we report a transmembrane molecule in hematopoietic progenitor cells that physically interacts with and inhibits RICTOR, an essential component of mTORC2. Upstream of mTORC2 (UT2) negatively regulates mTORC2 enzymatic activity, reducing AKTS473, PKCα, and NDRG1 phosphorylation and increasing FOXO transcriptional activity in an mTORC2-dependent manner. Modulating UT2 levels altered animal survival in a T cell acute lymphoid leukemia (T-ALL) model that is known to be mTORC2 sensitive. These studies identify an inhibitory component upstream of mTORC2 in hematopoietic cells that can reduce mortality from NOTCH-induced T-ALL. A transmembrane inhibitor of mTORC2 may provide an attractive target to affect this critical cell regulatory pathway.
| Reference Key |
lee2014stemtransmembrane
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|---|---|
| Authors | ;Dongjun Lee;Stephen M. Sykes;Demetrios Kalaitzidis;Andrew A. Lane;Youmna Kfoury;Marc H.G.P. Raaijmakers;Ying-Hua Wang;Scott A. Armstrong;David T. Scadden |
| Journal | nature reviews gastroenterology & hepatology |
| Year | 2014 |
| DOI |
10.1016/j.stemcr.2014.08.011
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