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10.1016/j.leukres.2015.03.010

http://scihub22266oqcxt.onion/10.1016/j.leukres.2015.03.010
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suck abstract from ncbi


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pmid25850729
      Leuk+Res 2015 ; 39 (6 ): 649-56
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  • LFA-1-targeting Leukotoxin (LtxA; Leukothera®) causes lymphoma tumor regression in a humanized mouse model and requires caspase-8 and Fas to kill malignant lymphocytes #MMPMID25850729
  • DiFranco KM ; Johnson-Farley N ; Bertino JR ; Elson D ; Vega BA ; Belinka BA Jr ; Kachlany SC
  • Leuk Res 2015[Jun]; 39 (6 ): 649-56 PMID25850729 show ga
  • Leukotoxin (LtxA) is a protein secreted from the oral bacterium Aggregatibacter actinomycetemcomitans. LtxA binds to the ?2 integrin lymphocyte-associated function antigen-1 (LFA-1) on human white blood cells (WBCs), resulting in cell death. LtxA is currently under investigation as a novel therapy (Leukothera(®)) for treating hematologic malignancies and autoimmune diseases. We show here that LtxA has potent in vivo anti-lymphoma activity in mice. LtxA caused complete regression of B-cell tumors and promoted long-term survival of mice. The mechanism of LtxA-mediated killing of malignant lymphocytes was further examined. We found that LtxA kills malignant lymphocytes by a novel mechanism requiring the death receptor Fas and caspase-8, but not Fas ligand (FasL) or caspase-9. We also determined that LFA-1 and Fas are closely associated on the cell surface and this proximity of LFA-1 and Fas could explain how signaling through an integrin can lead to cell death. In addition to LFA-1, this work reveals a second surface protein, Fas, that is critical for LtxA-mediated cell death. Knowledge of the mechanism of cell death induced by LtxA will facilitate the development and understanding of this potent experimental therapeutic agent.
  • |*Lymphoma, B-Cell/drug therapy/metabolism/pathology [MESH]
  • |Aggregatibacter actinomycetemcomitans/chemistry [MESH]
  • |Animals [MESH]
  • |B-Lymphocytes/metabolism [MESH]
  • |Bacterial Toxins/chemistry/*pharmacology [MESH]
  • |Caspase 8/*metabolism [MESH]
  • |Caspase 9/metabolism [MESH]
  • |Drug Delivery Systems [MESH]
  • |Exotoxins/chemistry/*pharmacology [MESH]
  • |Humans [MESH]
  • |Immunosuppressive Agents/chemistry/*pharmacology [MESH]
  • |Jurkat Cells [MESH]
  • |Lymphocyte Function-Associated Antigen-1 [MESH]
  • |Mice [MESH]
  • |Mice, Inbred NOD [MESH]
  • |Mice, SCID [MESH]
  • |Xenograft Model Antitumor Assays [MESH]


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