Journal
JOURNAL OF CELLULAR PHYSIOLOGY
Volume 234, Issue 6, Pages 9551-9563Publisher
WILEY
DOI: 10.1002/jcp.27643
Keywords
ABT-751; apoptosis; autophagy; Hep-3B; microtubule
Categories
Funding
- Kaohsiung Armed Forces General Hospital, Kaohsiung, Taiwan [104-2314-B-110-002]
- Ministry of Science and Technology, Taiwan [CMRPG8G0361]
- NSYSU-CGMH joint program, Taiwan [AS-KPQ-105-TPP]
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Abstarct The objective was to investigate the upstream mechanisms of apoptosis which were triggered by a novel antimicrotubule drug, ABT-751, in a tumor protein p53 (TP53)-deficient hepatocellular carcinoma-derived Hep-3B cells. A series of in vitro assays indicated that ABT-751 caused the disruption of the mitotic spindle structure, collapse of mitochondrial membrane potential, generation of reactive oxygen species, DNA damage, G(2)/M cell cycle arrest, inhibition of anchorage-independent cell growth and apoptosis in Hep-3B cells accompanied by alteration of the expression levels of several DNA damage checkpoint proteins and cell cycle regulators. Subsequently, ABT-751 triggered apoptosis along with markedly upregulated several proapoptotic proteins involving in extrinsic, intrinsic, and caspase-mediated apoptotic pathways. A pan-caspase inhibitor suppressed ABT-751-induced apoptosis. ABT-751 also induced autophagy soon after the occurrence of apoptosis through the suppression of AKT serine/threonine kinase/mechanistic target of rapamycin signaling pathway. Exogenous expression of the TP53 gene significantly incurred both apoptosis and autophagy in Hep-3B cells. Pharmacological inhibition of autophagosome (early autophagy) but not autolysosome (late autophagy) enhanced ABT-751-induced apoptosis in TP53-deficient Hep-3B cells. Our study provided a new strategy to augment ABT-751-induced apoptosis in TP53-deficient cells.
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