@article {572491,
	title = {Rapid induction of apoptosis during Kinesin-5 inhibitor-induced mitotic arrest in HL60 cells.},
	journal = {Cancer Lett},
	volume = {310},
	number = {1},
	year = {2011},
	month = {2011 Nov 1},
	pages = {15-24},
	abstract = {Small molecule inhibitors of Kinesin-5 (K5Is) that arrest cells in mitosis with monopolar spindles are promising anti-cancer drug candidates. Clinical trials of K5Is revealed dose-limiting neutropenia, or loss of neutrophils, for which the molecular mechanism is unclear. We investigated the effects of a K5I on HL60 cells, a human promyelocytic leukemia cell line that is often used to model dividing neutrophil progenitors in cell culture. We found K5I treatment caused unusually rapid death of HL60 cells exclusively during mitotic arrest. This mitotic death occurred via the intrinsic apoptosis pathway with molecular events that include cytochrome c leakage into the cytoplasm, caspase activation, and Parp1 cleavage. Bcl-2 overexpression protected from death. We probed mitochondrial physiology to find candidate triggers of cytochrome c release, and observed a decrease of membrane potential (ΔΨm) before mitochondrial outer membrane permeabilization (MOMP). Interestingly, this loss of ΔΨm was not blocked by overexpressing Bcl-2, suggesting it might be a cause of Bax/Bak activation, not a consequence. Taken together, these results show that K5I induces intrinsic apoptosis during mitotic arrest in HL60 with loss of ΔΨm as an upstream event of MOMP.},
	keywords = {Adenosine Triphosphatases, Apoptosis, Apoptosis Regulatory Proteins, BH3 Interacting Domain Death Agonist Protein, Blotting, Western, Cell Cycle, Cell Line, Cell Line, Tumor, Cell Survival, Enzyme Inhibitors, HeLa Cells, HL-60 Cells, Humans, Kinesin, Membrane Potential, Mitochondrial, Membrane Proteins, Microscopy, Fluorescence, Mitosis, Proto-Oncogene Proteins, Quinolines, RNA Interference},
	issn = {1872-7980},
	doi = {10.1016/j.canlet.2011.05.024},
	author = {Tang, Yangzhong and Orth, James D and Xie, Tiao and Mitchison, Timothy J.}
}
