Cellular effects of the microtubule-targeting agent peloruside A in hypoxia-conditioned colorectal carcinoma cells
Jazyk angličtina Země Nizozemsko Médium print-electronic
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
28366502
DOI
10.1016/j.bbagen.2017.03.023
PII: S0304-4165(17)30124-1
Knihovny.cz E-zdroje
- Klíčová slova
- Apoptosis, Hypoxia, Microtubule, Multi-drug resistance, Paclitaxel, Peloruside A,
- MeSH
- apoptóza účinky léků MeSH
- bicyklické sloučeniny heterocyklické farmakologie MeSH
- buňky HT-29 MeSH
- cyklin B1 metabolismus MeSH
- HCT116 buňky MeSH
- hypoxie buňky * MeSH
- kontrolní body buněčného cyklu účinky léků MeSH
- laktony farmakologie MeSH
- lidé MeSH
- mikrotubuly účinky léků MeSH
- paclitaxel farmakologie MeSH
- proliferace buněk účinky léků MeSH
- protinádorové látky farmakologie MeSH
- vinkristin farmakologie MeSH
- Check Tag
- lidé MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- bicyklické sloučeniny heterocyklické MeSH
- CCNB1 protein, human MeSH Prohlížeč
- cyklin B1 MeSH
- laktony MeSH
- paclitaxel MeSH
- peloruside A MeSH Prohlížeč
- protinádorové látky MeSH
- vinkristin MeSH
BACKGROUND: Hypoxia is a prominent feature of solid tumors, dramatically remodeling microtubule structures and cellular pathways and contributing to paclitaxel resistance. Peloruside A (PLA), a microtubule-targeting agent, has shown promising anti-tumor effects in preclinical studies. Although it has a similar mode of action to paclitaxel, it binds to a distinct site on β-tubulin that differs from the classical taxane site. In this study, we examined the unexplored effects of PLA in hypoxia-conditioned colorectal HCT116 cancer cells. METHODS: Cytotoxicity of PLA was determined by cell proliferation assay. The effects of a pre-exposure to hypoxia on PLA-induced cell cycle alterations and apoptosis were examined by flow cytometry, time-lapse imaging, and western blot analysis of selected markers. The hypoxia effect on stabilization of microtubules by PLA was monitored by an intracellular tubulin polymerization assay. RESULTS: Our findings show that the cytotoxicity of PLA is not altered in hypoxia-conditioned cells compared to paclitaxel and vincristine. Furthermore, hypoxia does not alter PLA-induced microtubule stabilization nor the multinucleation of cells. PLA causes cyclin B1 and G2/M accumulation followed by apoptosis. CONCLUSIONS: The cellular and molecular effects of PLA have been determined in normoxic conditions, but there are no reports of PLA effects in hypoxic cells. Our findings reveal that hypoxia preconditioning does not alter the sensitivity of HCT116 to PLA. GENERAL SIGNIFICANCE: These data report on the cellular and molecular effects of PLA in hypoxia-conditioned cells for the first time, and will encourage further exploration of PLA as a promising anti-tumor agent.
Biological Sciences Victoria University of Wellington Wellington New Zealand
Schools of Chemical and Physical Sciences Victoria University of Wellington Wellington New Zealand
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