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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Leuk+Res
2015 ; 39
(6
): 649-56
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
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.