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- W4361944324 abstract "<div>Abstract<p><b>Purpose:</b> Sensitivity of tumor cells toward chemotherapy mainly determines the prognosis of patients suffering from acute lymphoblastic leukemia (ALL); nevertheless, underlying mechanisms regulating chemosensitivity remain poorly understood. Here, we aimed at characterizing the role of caspase-8 for chemosensitivity of B- and T-ALL cells.</p><p><b>Experimental Design:</b> Primary tumor cells from children with ALL were evaluated for expression levels of the caspase-8 protein, were amplified in nonobese diabetic/severe combined immunodeficient mice, transfected with siRNA, and evaluated for their chemosensitivity <i>in vitro</i>.</p><p><b>Results:</b> Effective cell death in B- and T-ALL cells depended on the presence of caspase-8 for the majority of cytotoxic drugs routinely used in antileukemia treatment. Caspase-8 was activated independently from extrinsic apoptosis signaling. Accordingly in primary ALL cells, the expression level of caspase-8 protein correlated with cell death sensitivity toward defined cytotoxic drugs <i>in vitro</i>. In the subgroup of primary ALL cells, with low expression of caspase-8, methotrexate (MTX) upregulated the expression of caspase-8 mediated by the transcription factor p53, suggesting epigenetic silencing of caspase-8. RNA interference in patient-derived B- and T-ALL cells revealed that effective cell death induction by most routine drug combinations involving MTX depended on the presence of caspase-8.</p><p><b>Conclusion:</b> Our results indicate that caspase-8 is crucial for the high antileukemic efficiency of numerous routine cytotoxic drugs. Reexpression of epigenetically downregulated caspase-8 represents a promising approach to increase efficiency of antileukemic therapy. <i>Clin Cancer Res; 17(24); 7605–13. ©2011 AACR</i>.</p></div>" @default.
- W4361944324 created "2023-04-05" @default.
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- W4361944324 date "2023-03-31" @default.
- W4361944324 modified "2023-09-26" @default.
- W4361944324 title "Data from Important Role of Caspase-8 for Chemosensitivity of ALL Cells" @default.
- W4361944324 doi "https://doi.org/10.1158/1078-0432.c.6520842" @default.
- W4361944324 hasPublicationYear "2023" @default.
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