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Journal Article
Research Support, Non-U.S. Gov't
Synergistic Cytotoxicity of Bendamustine and the BTK Inhibitor in a Mantle Cell Lymphoma Cell Line.
Anticancer Research 2015 December
BACKGROUND: Bendamustine is effective in B-cell malignancies, including mantle cell lymphoma (MCL), alone and in combination with other agents. This study investigated the combination effect of bendamustine and the Bruton tyrosine kinase (BTK) inhibitor PCI-32765 on MCL cell death and the underlying mechanisms.
MATERIALS AND METHODS: Cytotoxicity was examined by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MIT) assay. Apoptosis was assessed by annexin V/propidium iodide staining and protein expression was analyzed by western blotting.
RESULTS: When combined with bendamustine, PCI-32765 showed a synergistic effect on growth inhibition of the MCL cell line Jeko-1. Cleavage of caspase-3 and poly-(ADP-ribose) polymerase was increased, indicating enhanced apoptosis induction. In addition, this combination decreased the protein expression of cyclin D1. Phosphorylated v-akt murine thymoma viral oncogene homolog 1 (AKT) (Ser473) was also down-regulated, suggesting a suppression of the phosphatidylinositol 3-kinase/AKT signaling pathway.
CONCLUSION: Combination treatment with bendamustine and a BTK inhibitor may be effective in MCL therapy.
MATERIALS AND METHODS: Cytotoxicity was examined by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MIT) assay. Apoptosis was assessed by annexin V/propidium iodide staining and protein expression was analyzed by western blotting.
RESULTS: When combined with bendamustine, PCI-32765 showed a synergistic effect on growth inhibition of the MCL cell line Jeko-1. Cleavage of caspase-3 and poly-(ADP-ribose) polymerase was increased, indicating enhanced apoptosis induction. In addition, this combination decreased the protein expression of cyclin D1. Phosphorylated v-akt murine thymoma viral oncogene homolog 1 (AKT) (Ser473) was also down-regulated, suggesting a suppression of the phosphatidylinositol 3-kinase/AKT signaling pathway.
CONCLUSION: Combination treatment with bendamustine and a BTK inhibitor may be effective in MCL therapy.
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