Análise proteômica em urina e rim de ratos submetidos a tratamento crônico com flúor / Proteomic analysis of urine kidney in fluoride-treated rat

AUTOR(ES)
DATA DE PUBLICAÇÃO

2008

RESUMO

Two-dimensional gel electrophoresis (2D-PAGE) based proteomics approach was used to better understand the molecular mechanisms of renal injury induced by fluoride (F) and define potentials biomarkers of fluorosis. Three groups of weanling male Wistar rats (21 days old) were treated with drinking water containing 0 (control), 5, or 50 ppm F for 60 days (n=6/group). During the experimental period, the animals were kept individually in metabolic cages, in order to analyze the water and food consumption, as well as fecal and urinary F excretion. Animals were killed and left kidney and serum were collected for histopathological examination and F analysis, respectively. For proteomic analysis, right kidney and urine (one day before sacrifice, in protease-inhibitors cocktail for 8 hours in ice box) were collected. After protein isolation, renal and urinary proteome profiles were examined using 2D-PAGE and coomassie brilliant blue staining. It was possible to detect a dose-response regarding F intake and F excretion, as well as F levels in serum and kidneys. The histological analysis revealed no damage in kidneys induced by F, except for a vascular congestion in the 50 ppm F group. For kidney, quantitative intensity analysis (Image Master Platinum software, 2-fold changes) revealed 30 and 17 differentially expressed proteins between control X 50 ppm F, and control X 5 ppm F groups, respectively. As for urine, 9, 10 and 13 proteins increased or decreased in control X 5 ppm F, 5 ppm F X 50 ppm F and control X 50 ppm F groups, respectively. Nine proteins were successfully identified by MALDI-TOF TOF MS. The identified proteins are mainly related with metabolism, detoxification and housekeeping. These data indicate that proteomic analysis in kidney and urine of F-treated animals is able to identify differentially expressed proteins, even in cases of low F doses. Thus, this approach can contribute for the understanding of the mechanisms underlying fluorosis, by indicating key-proteins that should be better addressed, as well as potential toxicity biomarkers.

ASSUNTO(S)

mass spectrometry rim proteomics urina fluoretos fluoride eletroforese bidimensional kidney two-dimensional electrophoresis espectrometria de massa urine proteômica

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