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Esmailzadeh, S; Huang, Y; Su, M-W; Zhou, Y; Jiang, X
Leukemia, 06/2015, Letnik: 29, Številka: 6Journal Article
The bridging integrator 1 (BIN1) tumor suppressor encodes multiple alternatively spliced isoforms implicated in DNA repair, cell-cycle control, apoptosis and membrane dynamics. BIN1 attenuation has been reported in several solid tumors; however, the role of BIN1 in lymphomagenesis remains unexplored. We recently demonstrated that BIN1 transcript levels are significantly downregulated in CD4(+)CD7(-) Sezary cells from patients with Sezary syndrome (SS), a subtype of cutaneous T-cell lymphoma (CTCL). We have now demonstrated that restored BIN1 expression in CTCL cells leads to a significant reduction in cell proliferation, an increase in spontaneous and Fas/Fas ligand (Fas/FasL)-induced apoptosis in vitro and inhibition of tumorigenic activity of CTCL cells in vivo. Interestingly, restoration of BIN1 expression in CTCL cells downregulates the expression of c-FLIP, an important inhibitor of Fas/FasL-mediated apoptosis, and activates the caspase cascade; these phenotypes can be rescued by knockdown of BIN1. Importantly, significantly reduced BIN1 expression and increased c-FLIP expression are observed in primary CTCL patient samples, and high BIN1 and low c-FLIP mRNA levels correlate with better survival rate in SS patients. These results indicate that BIN1 regulates Fas/FasL-mediated apoptosis through c-FLIP and that BIN1 deficiency may have an important role in CTCL pathogenesis by causing apoptosis resistance. Thus BIN1 and c-FLIP represent potential therapeutic targets in CTCL.
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