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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Myers, Benjamin R. Desai, Bimal N. Schreiber, Stuart L. |
| Description | Author Affiliation: Desai BN ( Department of Chemistry and Chemical Biology, Harvard University, Immunology Program, Division of Medical Sciences, Harvard Medical School, Boston, MA 02115, USA.); |
| Abstract | FKBP12-rapamycin associated protein (FRAP, also known as mTOR or RAFT) is the founding member of the phosphatidylinositol kinase-related kinase family and functions as a sensor of physiological signals that regulate cell growth. Signals integrated by FRAP include nutrients, cAMP levels, and osmotic stress, and cellular processes affected by FRAP include transcription, translation, and autophagy. The mechanisms underlying the integration of such diverse signals by FRAP are largely unknown. Recently, FRAP has been reported to be regulated by mitochondrial dysfunction and depletion of ATP levels. Here we show that exposure of cells to hyperosmotic conditions (and to glucose-deficient growth medium) results in rapid and reversible dissipation of the mitochondrial proton gradient. These results suggest that the ability of FRAP to mediate osmotic stress response (and glucose deprivation response) is by means of an intermediate mitochondrial dysfunction. We also show that in addition to cytosolic FRAP a large portion of FRAP associates with the mitochondrial outer membrane. The results support the existence of a stress-sensing module consisting of mitochondria and mitochondrial outer membrane-associated FRAP. This module allows the cell to integrate a variety of stress signals that affect mitochondrial function and regulate a growth checkpoint involving p70 S6 kinase. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 7 |
| Volume Number | 99 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2002-04-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Mitochondria Physiology Protein Kinases 3T3 Cells Animals Antigen-Antibody Complex Chemistry Cell Division Cell Membrane Jurkat Cells Mice Microscopy, Confocal Osmotic Pressure Sirolimus Pharmacology TOR Serine-Threonine Kinases Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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