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FASEB J. 2005 Mar 22; [Epub ahead of print] _Related Articles,_ (http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=pubmed&cmd=Display&dopt=pubmed_pubmed &from_uid=15784722&tool=ExternalSearch) _Links_ (javascript:PopUpMenu2_Set(Menu15784722);) (http://www.ncbi.nlm.nih.gov/entrez/utils/lofref.fcgi?PrId=3051&uid=15784722&db=PubMed&url=http://www.fasebj.org/cgi/pmidlookup?view=reprint&pmid=15784722) Identification of mTOR as a novel bifunctional target in chronic myeloid leukemia: dissection of growth-inhibitory and VEGF-suppressive effects of rapamycin in leukemic cells. Mayerhofer M, Aichberger KJ, Florian S, Krauth MT, Hauswirth AW, Derdak S, Sperr WR, Esterbauer H, Wagner O, Marosi C, Pickl WF, Deininger M, Weisberg E, Druker BJ, Griffin JD, Sillaber C, Valent P. The mammalian target of rapamycin (mTOR) has recently been described to be constitutively activated in Bcr-Abl-transformed cells and to mediate rapamycin-induced inhibition of growth in respective cell lines. We have recently shown that rapamycin down-regulates expression of vascular endothelial growth factor (VEGF), a mediator of leukemia-associated angiogenesis, in primary CML cells. In the present study, we analyzed growth-inhibitory in vitro and in vivo effects of rapamycin on primary CML cells and asked whether rapamycin-induced suppression of VEGF in leukemic cells is related to growth inhibition. Rapamycin dose dependently inhibited growth of primary CML cells obtained from patients with imatinib-responsive or imatinib-resistant disease as well as growth of Bcr-Abl-transformed imatinib-resistant cell lines. Moreover, we observed potent cytoreductive effects of rapamycin in a patient with imatinib-resistant Bcr-Abl+ leukemia. The growth-inhibitory effects of rapamycin on CML cells were found to be associated with G1 cell cycle arrest and with induction of apoptosis. In all cell types tested, rapamycin was found to down-regulate expression of VEGF. However, exogenously added VEGF did not counteract the rapamycin-induced decrease in proliferation. In conclusion, rapamycin inhibits growth of CML cells in vitro and in vivo and, in addition, down-regulates expression of VEGF. Both effects may contribute to the antileukemic activity of the drug in CML. PMID: 15784722 [PubMed - as supplied by publisher] ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/AybhMB/UOnJAA/xGEGAA/8zSolB/TM --------------------------------------------------------------------~-> New! Sign up for local CML support group meetings in your local community at http://cml.meetup.com Apply for Commercial Real Estate loans online and submit your deal to dozens of hungry lenders in just minutes. Loan programs for all types of business and commercial real estate. Apply anytime at http://realestatezoo.com CML (Chronic Myelogenous Leukemia Support List) --------------------------------- Part Of CMLHope.Com An International Community Of CML Patients For more information: http://cmlhope.com Post Message: [email protected] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] Change To No Mail/Web: [EMAIL PROTECTED] Change To Digest: [EMAIL PROTECTED] Change To Email: [EMAIL PROTECTED] List Help: [EMAIL PROTECTED] CML Group Web Site http://groups.yahoo.com/group/CML Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/CML/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
