Open AccessQuantitative proteomic analysis of mitochondria from human ovarian cancer cells and their paclitaxel‐resistant sublines
Author(s) -
Chen Ming,
Huang Hong,
He Haojie,
Ying Wantao,
Liu Xin,
Dai Zhiqin,
Yin Jie,
Mao Ning,
Qian Xiaohong,
Pan Lingya
Publication year - 2015
Publication title -
cancer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.035
H-Index - 141
eISSN - 1349-7006
pISSN - 1347-9032
DOI - 10.1111/cas.12710
Subject(s) - paclitaxel , ovarian cancer , cancer research , cancer , proteomics , downregulation and upregulation , biology , immunohistochemistry , cancer cell , cell , cell culture , chemistry , medicine , immunology , biochemistry , genetics , gene
Paclitaxel resistance is a major obstacle for the treatment of ovarian cancer. The chemoresistance mechanisms are partly related to the mitochondria. Identification of the relevant proteins in mitochondria will help in clarifying the possible mechanisms and in selecting effective chemotherapy for patients with paclitaxel resistance. In the present study, mitochondria from two paclitaxel‐sensitive human ovarian cancer cell lines ( SKOV 3 and A2780) and their corresponding resistant cell lines ( SKOV 3‐ TR and A2780‐ TR ) were isolated. Guanidine‐modified acetyl‐stable isotope labeling and liquid chromatography‐hybrid linear ion trap Fourier‐transform ion cyclotron resonance mass spectrometry ( LC ‐ FTICR MS ) were performed to find the expressed differential proteins. Comparative proteomic analysis revealed eight differentially expressed proteins in the ovarian cancer cells and their paclitaxel‐resistant sublines. Among them, mimitin and 14‐3‐3 ζ/δ were selected for further research. The effects of mimitin and 14‐3‐3 ζ/δ were explored using specific si RNA interference in ovarian cancer cell lines and immunohistochemistry in human tissue specimens. The downregulation of mimitin and 14‐3‐3 ζ/δ using specific si RNA in paclitaxel‐resistant ovarian cancer cells led to an increase in the resistance index to paclitaxel. Multivariate analyses demonstrated that lower expression levels of the mimitin and 14‐3‐3 ζ/δ proteins were positively associated with shorter progression‐free survival ( PFS ) and overall survival ( OS ) in patients with primary ovarian cancer (mimitin: PFS : P = 0.041, OS : P = 0.003; 14‐3‐3 ζ/δ: PFS : P = 0.031, OS : P = 0.011). Mimitin and 14‐3‐3 protein ζ/δ are potential markers of paclitaxel resistance and prognostic factors in ovarian cancer.