[Analysis of differential protein expression profile between retinoic acid resistant and sensitive acute promyelocytic leukemia cells].

BACKGROUND & OBJECTIVE: This study was to compare the protein expression profiles between retinoic acid (RA) resistant and sensitive acute promyelocytic leukemia (APL) cells by proteomic research method.

METHODS

Total cellular proteins extracted from a RA sensitive cell line NB4 and a RA resistant cell line MR2 were separated by two-dimensional (2D) polyacrylamide gel electrophoresis (PAGE). High quality 2D-PAGE protein profiles were obtained and analyzed by PDQuest v7.1 analysis software to screen differentially expressed protein spots. Those sports were identified by mass spectrometry.

RESULTS

2-DE patterns of APL cell lines with high-resolution and reproducibility were obtained. The average spots for MR2 and NB4 cells were 890+/-45 and 912+/-56, respectively. 57 significantly differentially expressed protein spots were screened, among which 23 protein spots were identified to be up-regulated and 34 down-regulated in MR2 cells compared with NB4 cells. Ten proteins were identified by mass spectrometry, with a successful identification rate of 70%. The identified proteins could be classified into different categories: oncogenes,cell cycle regulator and signal transducer.

CONCLUSION

The utilization of 2D-PAGE is effective in identifying the protein expression profiles between RA resistant and sensitive APL cells, therefore this study may provide a novel clue to elucidate the drug resistant mechanisms of all-trans retinoic acid.