RESUMO
AIM:To investigate the effect of cis-dichlorodiamine platinun ( cDDP) resistance on proliferation , apoptosis, migration and angiogenesis of esophageal cancer cell line KYSE 150.METHODS:Using the method of increa-sing concentration of cDDP in culture for 10 months, the human esophageal carcinoma cDDP-resistant cell line named KYSE150/cDDP was established successfully .The drug sensitivity was measured by MTT assay .The changes of the biolog-ical behaviors between the parental cell line and resistant cell line were determined by morphological observation assay , MTT assay, colony formation assay , DAPI staining, wound healing assay and tube formation experiment .RESULTS: No significant morphological difference between KYSE 150 cells and KYSE150/cDDP cells was observed .Compared with KYSE150 cells, the drug resistance index of KYSE150/cDDP cells was 6.35, and the viability of KYSE150/cDDP cells was decreased.The colony formation rate of KYSE150/cDDP cells was (15.00 ±3.05)%, while the colony formation rate of KYSE150 cells was (86.70 ±6.57)%.The apoptotic rate of KYSE150/cDDP cells was (0.63 ±0.09)%, and that of KYSE150 cells was (8.46 ±1.33)%.Compared with KYSE150 cells, KYSE150/cDDP cells showed a stronger healing ability of scratch, and the migration rate was higher than that of KYSE 150 cells.The results of tube formation experiment showed that the vessel number in KYSE150/cDDP group was 76.20 ±3.18, while the vessel number in KYSE150 group was 50.60 ±1.33.The protein expression of MMP-2 and VEGFR2 in KYSE150/cDDP cells was higher than that in KYSE150 cells.CONCLUSION: KYSE150/cDDP cells present drug-resistant phenotype and show a slow growth rate . The ability of apoptosis is decreased , and the abilities of cell migration and angiogenesis are increased .This may be an im-portant reason for the failure of clinical chemotherapy for esophageal cancer .