Comparative proteomics analysis of taxol resistance in human ovarian cancer / 中华老年医学杂志

ABSTRACT

Objective To analyze the differential expression of protein in taxol-resistance from elderly females with ovarian cancer, by compared proteomics analysis and identified the candidated marker in the clinical tissues. Methods Soluble fraction proteins in two SKOV3 taxol-resistant cells, SK-TR30 and SK-TR2500 and one A2780 taxol-resistant cell, A2780-TR paired taxol-sensitive ovarian cancer cells were separated and prepared by two dimensional gel electrophoresis (2-DE). The differentially expressed proteins were selected and identified by matrix-assisted laser desorption/lonization time of flight mass spectrometry(MALDI-TOF-MS) and database search. 2-DE profiles with high resolution and reproducibility were obtained. Then highly expressed protein-cofilin1 which exist in two forms of de-phosphorylate was detected and compared between human ovarian cancer specimens including 22 elderly female with chemosensitive and 21 elderly female with chemoresistant by immunohistochemistry. Results Among the identified proteins, there were sixteen over/under-expressed proteins in taxol-resistant cell lines as compared with taxol-sensitive cell lines. In particular, overexpression of cofilin1 and destrin were displayed in all three taxol-resistant cell lines. The expression of phosphorylation of cofilin (P＜0.05), but not cofilin1, displayed much higher in chemoresistant than in chemosensitive group. Conclusions Cofilin1 may play a role of taxol resistance by phosphorylation of ovarian cancer cell. However, the mechanisms need to be elucidated further.