Abstract | PURPOSE: 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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Authors | Ana Carolina Dos Santos Ferreira, Renan Amphilophio Fernandes, Jolie Kiemlian Kwee, Claudete Esteves Klumb |
Journal | Journal of cancer research and clinical oncology
(J Cancer Res Clin Oncol)
Vol. 138
Issue 2
Pg. 317-25
(Feb 2012)
ISSN: 1432-1335 [Electronic] Germany |
PMID | 22131152
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Apoptosis Regulatory Proteins
- BAX protein, human
- BCL2L11 protein, human
- Bcl-2-Like Protein 11
- Butyrates
- Histone Deacetylase Inhibitors
- Membrane Proteins
- Myeloid Cell Leukemia Sequence 1 Protein
- Proto-Oncogene Proteins
- Proto-Oncogene Proteins c-bcl-2
- bcl-2-Associated X Protein
- Etoposide
- Caspase 3
- Caspase 9
- Cisplatin
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Topics |
- Antineoplastic Combined Chemotherapy Protocols
(pharmacology)
- Apoptosis
(drug effects)
- Apoptosis Regulatory Proteins
(biosynthesis, genetics, metabolism)
- Bcl-2-Like Protein 11
- Burkitt Lymphoma
(drug therapy, genetics, metabolism, pathology)
- Butyrates
(administration & dosage, pharmacology)
- Caspase 3
(metabolism)
- Caspase 9
(metabolism)
- Cell Line, Tumor
- Cisplatin
(administration & dosage, pharmacology)
- Dose-Response Relationship, Drug
- Down-Regulation
(drug effects)
- Drug Synergism
- Etoposide
(administration & dosage, pharmacology)
- Histone Deacetylase Inhibitors
(administration & dosage, pharmacology)
- Humans
- Membrane Proteins
(biosynthesis, genetics, metabolism)
- Myeloid Cell Leukemia Sequence 1 Protein
- Proto-Oncogene Proteins
(biosynthesis, genetics, metabolism)
- Proto-Oncogene Proteins c-bcl-2
(antagonists & inhibitors, biosynthesis, genetics, metabolism)
- Up-Regulation
(drug effects)
- bcl-2-Associated X Protein
(biosynthesis, genetics, metabolism)
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