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KMID : 0620920000320040197
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Experimental & Molecular Medicine
2000 Volume.32 No. 4 p.197 ~ p.203
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Induction of apoptosis in human leukemia cells by 3- deazaadenosine is mediated by caspase-3-like activity
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In Kyung Kim/Ho Shik Kim
Seong Yun Jeong/Jeong Hwa Lee/Boe Eun Kim/Jin Woo Kim/Seong Whan Jeong/In Kyung Kim
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Abstract
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3-Deazaadenosine (DZA), one of the potent inhibitors of S-adenosylhomocysteine hydrolase, is known to possess several biological properties including an induction of apoptosis. To evaluate a possibility that DZA may be utilized for the treatment of human leukemia, we studied molecular events of cell death induced by DZA in human leukemia HL-60 and U-937 cells. DZA induced a specific cleavage of poly ADP-ribose polymerase (PARP) and an activation of the cysteine protease caspase-3/CPP32 which is known to cleave PARP. DZA-mediated nuclear DNA-fragmentation was completely blocked in the presence of a universal inhibitor of caspases (z-VAD-fmk) or the specific inhibitor of caspase-3 (z-DEVD-fmk) unlike of cycloheximide (CHX). DNA fragmentation was preceded by the lowering of c-myc mRNA in the DZA treated cells. In addition, DZA-induced apoptosis was blocked by pretreatment with adenosine transporter inhibitors such as nitrobenzylthioinosine (NBTI) and dipyridamole (DPD). Taken together, these results demonstrate that DZA-induced apoptosis initiated through an active transport of DZA into human leukemia cells, is dependent on the caspase-3-like activity without de novo synthesis of proteins and possibly involves c-myc down-regulation.
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KEYWORD
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3-deazaadenosine, leukemia, apoptosis, caspase, c-myc,
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