Lu KH, Lue KH, Liao HH, Lin KL, Chung JG. Induction of caspase-3-dependent apoptosis in human leukemia HL-60 cells by paclitaxel.
Clin Chim Acta 2005;
357:65-73. [PMID:
15963795 DOI:
10.1016/j.cccn.2005.02.003]
[Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2004] [Revised: 01/29/2005] [Accepted: 02/01/2005] [Indexed: 11/30/2022]
Abstract
BACKGROUND
Paclitaxel, an antineoplastic drug, inhibits cell growth and cell cycle progression and induces apoptosis in human leukemia HL-60 cells. Caspase-3 plays a direct role in proteolytic cleavage of cellular proteins responsible for progression to apoptosis.
METHODS
We examined the cell morphology and apoptosis in HL-60 cells after exposure to paclitaxel and measured caspase-3 activities with or without z-VAD-fmk (a broad-spectrum caspase inhibitor) pretreatment by flow cytometric analysis and Western blotting.
RESULTS
Together, our results were (1) paclitaxel mainly induced G2/M cell cycle arrest in HL-60 cells (p<0.001); (2) time (p<0.001)- and dose-dependent (p<0.001) apoptosis of HL-60 cells was induced by paclitaxel; (3) in HL-60 cells, z-VAD-fmk blocked paclitaxel-induced apoptosis (12 h: p<0.001; 24 h: p<0.01; 48 h: p<0.01; 72 h: p<0.001) and caspase-3 activation (12 h: p<0.05; 24 h: p<0.01; 48 h: p<0.01; 72 h: p<0.01).
CONCLUSIONS
These results suggest that paclitaxel can induce G2/M cell cycle transition and apoptosis via caspase-3 activity in HL-60 cells.
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