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Journal of Korean Medical Science ; : 1464-1472, 2014.
Article in English | WPRIM | ID: wpr-174930

ABSTRACT

Mcl-1 and Bcl-xL, key anti-apoptotic proteins of the Bcl-2 family, have attracted attention as important molecules in the cell survival and drug resistance. In this study, we investigated whether inhibition of Bcl-xL influences cell growth and apoptosis against simultaneous treatment of resveratrol and clofarabine in the human malignant mesothelioma H-2452 cells. Resveratrol and clofarabine decreased Mcl-1 protein levels but had little effect on Bcl-xL levels. In the presence of two compounds, any detectable change in the Mcl-1 mRNA levels was not observed in RT-PCR analysis, whereas pretreatment with the proteasome inhibitor MG132 led to its accumulation to levels far above basal levels. The knockdown of Bcl-xL inhibited cell proliferation with cell accumulation at G2/M phase and the appearance of sub-G0/G1 peak in DNA flow cytometric assay. The suppression of cell growth was accompanied by an increase in the caspase-3/7 activity with the resultant cleavages of procaspase-3 and its substrate poly (ADP-ribose) polymerase, and increased percentage of apoptotic propensities in annexin V binding assay. Collectively, our data represent that the efficacy of resveratrol and clofarabine for apoptosis induction was substantially enhanced by Bcl-xL-lowering strategy in which the simultaneous targeting of Mcl-1 and Bcl-xL could be a more effective strategy for treating malignant mesothelioma.


Subject(s)
Humans , Adenine Nucleotides/pharmacology , Antimetabolites, Antineoplastic/pharmacology , Apoptosis/drug effects , Arabinonucleosides/pharmacology , Caspase 3/metabolism , Caspase 7/metabolism , Cell Line, Tumor , Cell Proliferation/drug effects , G2 Phase Cell Cycle Checkpoints/drug effects , Gene Knockdown Techniques , Leupeptins/pharmacology , Lung Neoplasms/metabolism , M Phase Cell Cycle Checkpoints/drug effects , Mesothelioma/metabolism , Myeloid Cell Leukemia Sequence 1 Protein/antagonists & inhibitors , RNA Interference , RNA, Messenger/metabolism , RNA, Small Interfering/metabolism , Stilbenes/pharmacology , bcl-X Protein/antagonists & inhibitors
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