Proteomic analysis of human NK-92 cells after NK cell-mediated cytotoxicity against K562 cells.
To better understand the natural killer (NK) cell cytotoxicity mechanism at the proteome level, we comparatively analyzed the proteome of the human NK-92 cells which participate in NK cell-mediated cytotoxicity assay and that of control cells. Soluble proteins were separated by two-dimensional gel electrophoresis (2-DE), 75 protein spots were found to be reproducibly differentially expressed between control and cytotoxic human NK-92 cells. A total of 60 different proteins were unequivocally identified by MALDI-TOF MS coupled with database interrogation; 37 proteins were up-regulated, whereas 23 proteins were down-regulated. Western blotting analysis of heat shock protein 60 (HSP60) and cathepsin W verified their proteome results. Some of identified proteins are involved in NK-92 cytotoxicity, which is consistent with the literature. In addition, we modeled the pathway networks between differentially expressed proteins and cellular processes of secretion and exocytosis through PathwayStudio software. The results of this study help to provide insight into the molecular mechanism of NK cell cytotoxicity.
Separation Science Institute, Key Laboratory of Biomedical Information Engineering of Education Ministry, Xi'an Jiaotong University, Xi'an, 710049, P. R. China.
Xi-Cheng
XC
Liu
Heng
H
Liang
Zhen
Z
Tian
Yu-Song
YS
Ruan
Lin
L
Zhang
Yang
Y
Chen
D056664:Cathepsin W; D002403:Cathepsins / Q000378:metabolism; D018834:Chaperonin 60 / Q000378:metabolism; D003546:Cysteine Endopeptidases / Q000378:metabolism; D003602:Cytotoxicity, Immunologic; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D020014:K562 Cells; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism; D020543:Proteome / Q000378:metabolism*; D015398:Signal Transduction; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D018834:Chaperonin 60; D020543:Proteome; D002403:Cathepsins; C534187:CTSW protein, human; D056664:Cathepsin W; D003546:Cysteine Endopeptidases