title: Defining the role of TORC1/2 in multiple myeloma.
abstract: Mammalian target of rapamycin (mTOR) is a downstream serine/threonine kinase of the PI3K/Akt pathway that integrates signals from the tumor microenvironment to regulate multiple cellular processes. Rapamycin and its analogs have not shown significant activity in multiple myeloma (MM), likely because of the lack of inhibition of TORC2. In the present study, we investigated the baseline activity of the PI3K/Akt/mTOR pathway TORC1/2 in MM cell lines with different genetic abnormalities. TORC1/2 knock-down led to significant inhibition of the proliferation of MM cells, even in the presence of BM stromal cells. We also tested INK128, a dual TORC1/2 inhibitor, as a new therapeutic agent against these MM cell lines. We showed that dual TORC1/2 inhibition is much more active than TORC1 inhibition alone (rapamycin), even in the presence of cytokines or stromal cells. In vitro and in vivo studies showed that p-4EBP1 and p-Akt inhibition could be predictive markers of TORC2 inhibition in MM cell lines. Dual TORC1/2 inhibition showed better inhibition of adhesion to BM microenvironmental cells and inhibition of homing in vivo. These studies form the basis for further clinical testing of TORC1/2 inhibitors in MM.
authors: Medical Oncology, Dana-Farber Cancer Institute, Boston, MA 02115, USA.
authors: Patricia
authors: P
authors: Maiso
authors: Yi
authors: Y
authors: Liu
authors: Brittany
authors: B
authors: Morgan
authors: Abdel Kareem
authors: AK
authors: Azab
authors: Pingda
authors: P
authors: Ren
authors: Michel B
authors: MB
authors: Martin
authors: Yong
authors: Y
authors: Zhang
authors: Yang
authors: Y
authors: Liu
authors: Antonio
authors: A
authors: Sacco
authors: Hai
authors: H
authors: Ngo
authors: Feda
authors: F
authors: Azab
authors: Phong
authors: P
authors: Quang
authors: Scott J
authors: SJ
authors: Rodig
authors: Charles P
authors: CP
authors: Lin
authors: Aldo M
authors: AM
authors: Roccaro
authors: Christian
authors: C
authors: Rommel
authors: Irene M
authors: IM
authors: Ghobrial
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D000818:Animals; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects; D015153:Blotting, Western; D002352:Carrier Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D018797:Cell Cycle Proteins; D002460:Cell Line; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002478:Cells, Cultured; D006801:Humans; D000076222:Mechanistic Target of Rapamycin Complex 1; D051379:Mice; D016513:Mice, SCID; D009101:Multiple Myeloma / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D046912:Multiprotein Complexes; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010750:Phosphoproteins / Q000378:metabolism; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D011506:Proteins / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism*; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D034622:RNA Interference; D000076226:Rapamycin-Insensitive Companion of mTOR Protein; D000076223:Regulatory-Associated Protein of mTOR; D015398:Signal Transduction / Q000187:drug effects; D020123:Sirolimus / Q000494:pharmacology; D058570:TOR Serine-Threonine Kinases / Q000037:antagonists & inhibitors / Q000235:genetics / Q000378:metabolism; D023041:Xenograft Model Antitumor Assays
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000903:Antibiotics, Antineoplastic; D002352:Carrier Proteins; D018797:Cell Cycle Proteins; D000076222:Mechanistic Target of Rapamycin Complex 1; D046912:Multiprotein Complexes; D019869:Phosphatidylinositol 3-Kinases; D010750:Phosphoproteins; D047428:Protein Kinase Inhibitors; D011506:Proteins; D051057:Proto-Oncogene Proteins c-akt; D000076226:Rapamycin-Insensitive Companion of mTOR Protein; D000076223:Regulatory-Associated Protein of mTOR; D020123:Sirolimus; D058570:TOR Serine-Threonine Kinases; C087000:EIF4EBP1 protein, human; C492571:RICTOR protein, human; C463659:RPTOR protein, human