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Simvastatin induces apoptosis of B-CLL cells by activation of mitochondrial caspase 9
- Source :
- Experimental hematology. 31(9)
- Publication Year :
- 2003
-
Abstract
- Chronic lymphocytic leukemia (CLL) is the most common leukemia in the western world. Despite several advances in therapeutic options, the disease remains incurable. Recently, it was repeatedly demonstrated that statins, competitive inhibitors of 3-hydroxy-3-methyl glutaryl coenzyme A (HMG-CoA) reductase, have antineoplastic effects. Therefore we aimed to study the effects of simvastatin (Sim) on malignant B cells derived from patients with CLL and mechanisms of action of the drug.Purified B-CLL cells from 15 patients were cultured either alone or with Sim at concentrations of 10, 50, and 100 microM. Viability, measured by the activity of mitochondrial dehydrogenases, was reduced significantly in the cells treated with Sim at 50 and 100 microM for 24 hours (p0.005). The level of apoptosis, as measured by annexin binding to exposed phosphatidylserine moieties, increased significantly in the treated cells at concentrations higher than 50 microM for 24 hours (p0.003). The level of necrosis, as measured by propidium iodide internalization, increased significantly after 24 hours exposure to Sim at 50 microM (p0.01). The apoptotic cascade was studied by immunoblot analysis of caspases following Sim treatment. These showed cleavage of caspases 9, 8, and 3. Addition of the caspase inhibitor Z-VAD.fmk inhibited caspase 8 and 3 significantly but did not affect caspase 9.Exposure of clonal B lymphocytes from patients with CLL to simvastatin decreases viability significantly by the induction of apoptosis. The apoptosis induced by Sim is probably initiated by the mitochondrial caspase 9, which indirectly leads to activation of caspase 3 and 8.
- Subjects :
- Cancer Research
Simvastatin
Chronic lymphocytic leukemia
Caspase 3
Apoptosis
Reductase
Caspase 8
Genetics
medicine
Tumor Cells, Cultured
Humans
Molecular Biology
Caspase-9
biology
Cell Biology
Hematology
medicine.disease
Molecular biology
Leukemia, Lymphocytic, Chronic, B-Cell
Caspase 9
Enzyme Activation
Leukemia
Caspases
Cancer research
biology.protein
Hydroxymethylglutaryl-CoA Reductase Inhibitors
medicine.drug
Subjects
Details
- ISSN :
- 0301472X
- Volume :
- 31
- Issue :
- 9
- Database :
- OpenAIRE
- Journal :
- Experimental hematology
- Accession number :
- edsair.doi.dedup.....7a6303051ee2828f1c42cd4a26e7b6e5