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Histone deacetylase inhibitor potentiates chemotherapy-induced apoptosis through Bim upregulation in Burkitt's lymphoma cells. | LitMetric
Purpose : Although polychemotherapy regiments have improved clinical outcome for Burkitt's lymphoma (BL) patients, salvage treatment of patients with refractory disease remains very poor. Combined therapies protocols have been emerging to improve treatment strategies to circumvent responseless BL patients. We evaluate the cell death effect of histone deacetylase inhibitor (HDACI) combined with etoposide (VP-16) and cisplatin (CDDP) on BL cell lines.Methods : 3-(4,5-Dimethyl-thiazol-2-yl)-2,5-diphenyltetrazoliumbromide (MTT) assay was performed to assess drug toxicity. To establish the concentrations and time of incubation for the combined treatment, a kinetic analysis was performed for each drug on BL41 and Raji BL cell lines for 24, 48 and 72 h. Apoptosis was assessed by flow cytometry using Annexin V/propidium iodide (PI) and cleaved caspase 3 labeling assays. Caspase 9 activation and levels of Bcl-2 family proteins were analyzed by Western blot.Results : The doses of NaB (1.0 mM), CDDP (1.0 and 2.5 μM), and VP-16 (0.1 and 0.3 μM) after 24 h of incubation were chosen for the evaluation of combined therapy. The apoptotic effects on BL cell lines of NaB/VP-16 and NaB/CDDP were followed by upregulation of Bim protein (P < 0.05), activation of caspase-3 and caspase-9, followed by Mcl-1 downregulation (P < 0.05). However, Bim overexpression was not correlated with Bcl-2 inhibition (P > 0.05) and was accompanied by increase in Bax expression (P < 0.05). The combination effects of NaB/VP-16 and NaB/CDDP were found to be synergistic and additive, respectively, in both the cell lines.Conclusions : The study provides strong evidence for the synergistic effects of the association with HDCI and chemotherapy in BL cells.
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