title: Differencial proteome of clear-cell renal cell carcinoma (ccRCC) tissues.
abstract: OBJECTIVE
  We attempted to detect, for the first time in a Brazilian cohort, differences in protein expression between clear-cell renal cell carcinoma (ccRCC) and their normal adjacent tissues, aiming to identify biomarkers and/or therapeutic target candidates for this disease.
  
  
  METHODS
  Twenty-four ccRCC and adjacent normal tissues were collected after surgery and their protein extracts were quantified, pooled and separated by two-dimensional polyacrylamide gel electrophoresis (2DE), followed by statistical analysis of the stained gels. Spots of interest were excised from the gels, digested with trypsin and identified by MALDI-TOF-TOF mass spectrometry.
  
  
  RESULTS
  Twenty-six differential spots were detected between the two classes of tissues, among which twenty were identified by mass spectrometry and sixteen were found to be non-redundant. Eleven proteins were either underexpressed or undetected in the ccRCC extracts, such as prohibitin and peroxiredoxin-3, whereas five were found to be overexpressed or exclusively detected in the ccRCC extract, including αβ crystalin and heat shock protein 27.
  
  
  CONCLUSIONS
  Several proteins were detected at differential levels when compared to normal adjacent tissues, and, moreover, many have been previously described by their relationship with RCC. Therefore, this work corroborates previous reports on the search for biomarkers for ccRCC, as well as it points out new candidates that may be validated in future studies.
authors.affiliation: Applied Genetic Laboratory, Hematology Division, National Institute of Cancer, RJ, Brazil.
authors.forename: Ana Júlia
authors.initials: AJ
authors.lastname: Vieira de Ribeiro
authors.forename: Vanessa
authors.initials: V
authors.lastname: Sandim
authors.forename: Antonio Augusto
authors.initials: AA
authors.lastname: Ornellas
authors.forename: Rodrigo Siqueira
authors.initials: RS
authors.lastname: Reis
authors.forename: Gilberto
authors.initials: G
authors.lastname: Domont
authors.forename: Gilda
authors.initials: G
authors.lastname: Alves
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D014408:Biomarkers, Tumor / Q000032:analysis; D002292:Carcinoma, Renal Cell / Q000737:chemistry* / Q000473:pathology; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D006801:Humans; D007668:Kidney / Q000737:chemistry* / Q000473:pathology; D007680:Kidney Neoplasms / Q000737:chemistry* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D060787:Neoplasm Grading; D009363:Neoplasm Proteins / Q000032:analysis; D020543:Proteome / Q000032:analysis*; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins; D020543:Proteome