[Investigation of epithelial-mesenchymal transition induced by cisplatin on human laryngeal resistant cancer cells].

To investigate the mechanism between epithelial-mesenchymal transition (EMT) and cisplatin induced resistant cell subline and the malignant biological characteristics, to explore EMT in human hep-2 laryngeal resistant cells. Using cisplatin-resistant cells (hep-2/CDDP) and non-resistant cells (hep-2) established in our previous study; the invasion and migration biological behaviors were detected by transwell and scratch assay; the expressions of E-cadherin, Zo-1, Snail, Slug, Twist1, Vimentinon in the mRNA level were detected by RT-qPCR and the protein level by Western blot. Transwell and scratch assay show the invasion and migration behaviors were increased in hep-2/CDDP cells (<0.05), the epithelial marker E-cadherin and Zo-1 were downregulated in hep-2/CDDP cells (all <0.05), transcription factor Snail, Slug were upregulated in mRNA and protein level (all <0.01) while Twist1 had no significant changed in protein level (>0.05), the expression of mesenchymal marker Vimentin was also increased in mRNA and protein levels in cisplatin resistant cells (<0.01). It was confirmed that the hep-2/CDDP cells possessed EMT phenotypes. The cisplatin resistant laryngeal cancer cells perform higherinvasion and migration biological behaviors,and the mechanisms of increased ability of invasion and migration induced by cisplatin was associated to eEMT, study on signal path related to EMT may overcome cisplatin resistance and reduce invasion and migration behaviors.