title: Suppression of human selenium-binding protein 1 is a late event in colorectal carcinogenesis and is associated with poor survival.
abstract: The purpose of this study was to analyze altered protein expression in cancer tissues and determine its relationship to prognosis in colorectal carcinomas. We performed proteomic expression analysis on 14 colorectal carcinomas and matched nontumorous colonic mucosa by 2-DE and MALDI-TOF-MS. Comparative analysis of the respective spot patterns on 2-DE showed 14 spots that were markedly changed in the colorectal carcinomas. Among them, selenium-binding protein 1 (SELENBP1) was markedly decreased in 12 (85%) carcinomas. The reduced expression of SELENBP1 was further supported by Western blot analysis and immunohistochemistry. Suppression of SELENBP1 was further analyzed in another eight-paired adenomas and carcinomas from the same patients using Western blot analysis and immunohistochemistry, and revealed that one adenoma and seven carcinomas exhibited markedly reduced SELENBP1 expression. Patients with low levels of SELENBP1 expression had significantly lower overall survival rates (72 vs. 85%, p = 0.021) among the 240 stages II and III colorectal carcinomas by using tissue microarray analysis. Our findings indicate that suppression of SELENBP1 is a frequent and late event in colorectal carcinogenesis, and may contribute to the rapid progression of colorectal carcinoma.
authors.affiliation: Department of Pathology, Yonsei University College of Medicine, Seoul, Korea.
authors.forename: Hyunki
authors.initials: H
authors.lastname: Kim
authors.forename: Hyun Ju
authors.initials: HJ
authors.lastname: Kang
authors.forename: Kwon Tae
authors.initials: KT
authors.lastname: You
authors.forename: Se Hoon
authors.initials: SH
authors.lastname: Kim
authors.forename: Kang Young
authors.initials: KY
authors.lastname: Lee
authors.forename: Tae Il
authors.initials: TI
authors.lastname: Kim
authors.forename: Chul
authors.initials: C
authors.lastname: Kim
authors.forename: Si Young
authors.initials: SY
authors.lastname: Song
authors.forename: Hye-Jung
authors.initials: HJ
authors.lastname: Kim
authors.forename: Cheolju
authors.initials: C
authors.lastname: Lee
authors.forename: Hoguen
authors.initials: H
authors.lastname: Kim
mesh_terms: D000236:Adenoma / Q000175:diagnosis / Q000378:metabolism* / Q000473:pathology; D014408:Biomarkers, Tumor / Q000378:metabolism; D002277:Carcinoma / Q000175:diagnosis / Q000378:metabolism* / Q000473:pathology; D003106:Colon / Q000378:metabolism / Q000473:pathology; D015179:Colorectal Neoplasms / Q000175:diagnosis / Q000378:metabolism* / Q000473:pathology; D015536:Down-Regulation; D015180:Electrophoresis, Gel, Two-Dimensional; D006801:Humans; D007413:Intestinal Mucosa / Q000378:metabolism* / Q000473:pathology; D011379:Prognosis; D020543:Proteome / Q000378:metabolism*; D051137:Selenium-Binding Proteins / Q000378:metabolism*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D046888:Tissue Array Analysis
chemical_list: D014408:Biomarkers, Tumor; D020543:Proteome; C495175:SELENBP1 protein, human; D051137:Selenium-Binding Proteins