Early urinary candidate biomarker discovery in a rat thioacetamide-induced liver fibrosis model
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Biomarker is the change associated with the disease. Blood is relatively stable because of the homeostatic mechanisms of the body. However, urine accumulates changes of the body, which makes it a better early biomarker source. Liver fibrosis is a reversible pathological condition, whereas cirrhosis, the end-stage of liver fibrosis, is irreversible. Consequently, noninvasive early biomarkers for fibrosis are desperately needed. In this study, differential urinary proteins were identified in the thioacetamide liver fibrosis rat model using tandem mass tagging and two-dimensional liquid chromatography tandem mass spectrometry. A total of 766 urinary proteins were identified, 143 and 118 of which were significantly changed in the TAA 1-week and 3-week groups, respectively. Multiple reaction monitoring (MRM)-targeted proteomics was used to further validate the abundant differentially expressed proteins. A total of 40 urinary proteins were statistically significant, 15 of which had been previously reported as biomarkers of liver fibrosis, cirrhosis or other related diseases and 10 of which had been reported to be associated with the pathology and mechanism of liver fibrosis. These differential proteins were detected in urine before the alanine aminotransferase and aspartate transaminase changes in the serum and before fibrosis was observed upon hematoxylin and eosin (HE) and Masson’s staining.
Keywordsurine proteomics biomarker animal model liver fibrosis
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This work was supported by the National Key Research and Development Program of China (2016YFC1306300), the National Basic Research Program of China (2013CB530850), Beijing Natural Science Foundation (7173264, 7172076) and Funds from Beijing Normal University (11100704, 10300-310421102).
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