title: Quantitative protein expression profiling of 14-3-3 isoforms in human renal carcinoma shows 14-3-3 epsilon is involved in limitedly increasing renal cell proliferation.
abstract: 14-3-3 proteins regulate many cellular processes that are implicated in cancer development, and the seven 14-3-3 isoforms have different expression level and isoform-specific roles in different tumors. However, the biological functions of 14-3-3 proteins and their correlations with renal carcinoma have not been investigated so far. In our study, the expression profiles and functional characterization of 14-3-3 proteins were discovered by a sensitive stable isotope labeling with amino acids in cell culture based quantitative proteomics analysis in human renal carcinoma tissues. We found that 14-3-3epsilon was up-regulated with 1.44-fold changes in renal cancerous tissues compared with that in counterpart kidney tissues, and 14-3-3sigma was almost not detected in both tissues due to its DNA highly methylated in our previous reports. The other five isoforms almost have similar expression level in two states of renal tissues. The following RT-PCR, Western blot and immunohistochemistry analysis for specific 14-3-3 isoform expression were all consistent with the quantitative proteomic data. Furthermore, the overexpression of 14-3-3epsilon in vitro can limitedly prompt the abnormal growth of renal tumor cells.
authors: State Key Laboratory of Biotherapy and Cancer Center, West China Hospital, West China Medical School, Sichuan University, Chengdu 610041, PR China. zizi2006@yahoo.cn
authors: Shufang
authors: S
authors: Liang
authors: Yuhuan
authors: Y
authors: Xu
authors: Guobo
authors: G
authors: Shen
authors: Qingping
authors: Q
authors: Liu
authors: Xinyu
authors: X
authors: Zhao
authors: Zhizhong
authors: Z
authors: Xu
authors: Xi
authors: X
authors: Xie
authors: Fengming
authors: F
authors: Gong
authors: Ronghui
authors: R
authors: Li
authors: Yuquan
authors: Y
authors: Wei
mesh_terms: D048948:14-3-3 Proteins / Q000235:genetics / Q000378:metabolism*; D015153:Blotting, Western; D002292:Carcinoma, Renal Cell / Q000378:metabolism*; D045744:Cell Line, Tumor; D049109:Cell Proliferation; D006801:Humans; D007150:Immunohistochemistry; D007553:Isotope Labeling; D007680:Kidney Neoplasms / Q000378:metabolism*; D020033:Protein Isoforms; D040901:Proteomics / Q000379:methods*; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D048948:14-3-3 Proteins; D020033:Protein Isoforms; C482983:YWHAE protein, human