Anti-apoptotic role of TWIST and its association with Akt pathway in mediating taxol resistance in nasopharyngeal carcinoma cells.

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Zhang X, Wang Q, Ling MT, Wong YC, Leung SC, Wang X

Anti-apoptotic role of TWIST and its association with Akt pathway in mediating taxol resistance in nasopharyngeal carcinoma cells.

Int J Cancer. 2007 May 1;120(9):1891-8.

PubMed ID

17230521 [ View in PubMed

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Abstract

TWIST, a basic helix-loop-helix transcription factor, has been reported to be associated with development and progression of human cancer. Recently, over expression of TWIST is found in cancer patients with shorter survival and poor response to chemotherapy. Previously, we found that upregulation of TWIST was responsible for the development of acquired resistance to taxol in a nasopharyngeal carcinoma (NPC) cell line, HNE1-T3 (Wang et al., Oncogene, 2004;24:274). In this study, we investigated the underlying molecular mechanisms responsible for the TWIST-mediated taxol resistance. By comparison of the parental HNE1 and its derivative HNE1-T3 cell lines, we found that the resistance to taxol in HNE1-T3 cells was associated with suppression of taxol-induced apoptosis evidenced by decreased expression of Bak and Bax and increased Bcl-2, as well as inhibition of PARP and caspase cleavage and DNA ladder formation. However, there was no correlation between taxol sensitivity and alterations on G2/M cell cycle distribution, suggesting that the TWIST-induced taxol resistance is mediated through protection against apoptosis but not mitotic arrest. Analysis of additional 8 NPC cell lines showed that upregulation of TWIST was associated with resistance to microtubule disrupting agents, especially taxol, and inactivation of TWIST through small RNA interference led to increased sensitivity to taxol-induced cell death. Subsequent studies also demonstrated that the TWIST-mediated taxol resistance may be regulated through its positive involvement with the Akt pathway. Our findings suggest an underlying molecular mechanism responsible for the TWIST-mediated chemodrug resistance and suggest a target for overcoming taxol resistance in cancer cells.

DrugBank Data that Cites this Article

Drug Targets

Drug	Target	Kind	Organism	Pharmacological Action	Actions
Paclitaxel	Apoptosis regulator Bcl-2	Protein	Humans	Yes	Inhibitor	Details