PMID- 19505958 OWN - NLM STAT- MEDLINE DCOM- 20091102 LR - 20230815 IS - 1460-2083 (Electronic) IS - 0964-6906 (Print) IS - 0964-6906 (Linking) VI - 18 IP - 17 DP - 2009 Sep 1 TI - Functional interaction of mammalian target of rapamycin complexes in regulating mammalian cell size and cell cycle. PG - 3298-310 LID - 10.1093/hmg/ddp271 [doi] AB - Dysregulation of the mammalian target of rapamycin (mTOR) kinase pathway is centrally involved in a wide variety of cancers and human genetic diseases. In mammalian cells, mTOR is part of two different kinase complexes: mTORC1 composed of mTOR, raptor and mLST8, and mTORC2 containing mTOR, rictor, sin1 and mLST8. Whereas, mTORC1 is known to be a pivotal regulator of cell size and cell cycle control, the question whether the recently discovered mTORC2 complex is involved in these processes remains elusive. We report here that the mTORC1-mediated consequences on cell cycle and cell size are separable and do not involve effects on mTORC2 activity. However, we show that mTORC2 itself is a potent regulator of mammalian cell size and cell cycle via a mechanism involving the Akt/TSC2/Rheb cascade. Our data are of relevance for the understanding of the molecular development of the many human diseases caused by deregulation of upstream and downstream effectors of mTOR. FAU - Rosner, Margit AU - Rosner M AD - Medical Genetics, Medical University of Vienna, 1090 Vienna, Austria. FAU - Fuchs, Christiane AU - Fuchs C FAU - Siegel, Nicol AU - Siegel N FAU - Valli, Alessandro AU - Valli A FAU - Hengstschlager, Markus AU - Hengstschlager M LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't DEP - 20090608 PL - England TA - Hum Mol Genet JT - Human molecular genetics JID - 9208958 RN - 0 (Multiprotein Complexes) RN - EC 2.7.- (Protein Kinases) RN - EC 2.7.1.1 (MTOR protein, human) RN - EC 2.7.11.1 (TOR Serine-Threonine Kinases) SB - IM MH - *Cell Cycle MH - Cell Line MH - *Cell Size MH - Humans MH - Multiprotein Complexes/genetics/*metabolism MH - Protein Kinases/genetics/*metabolism MH - TOR Serine-Threonine Kinases PMC - PMC2722991 EDAT- 2009/06/10 09:00 MHDA- 2009/11/03 06:00 PMCR- 2009/06/08 CRDT- 2009/06/10 09:00 PHST- 2009/06/10 09:00 [entrez] PHST- 2009/06/10 09:00 [pubmed] PHST- 2009/11/03 06:00 [medline] PHST- 2009/06/08 00:00 [pmc-release] AID - ddp271 [pii] AID - 10.1093/hmg/ddp271 [doi] PST - ppublish SO - Hum Mol Genet. 2009 Sep 1;18(17):3298-310. doi: 10.1093/hmg/ddp271. Epub 2009 Jun 8.