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Characterization and Proteome of Circulating Extracellular Vesicles as Potential Biomarkers for NASH
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Characterization and Proteome of Circulating Extracellular Vesicles as Potential Biomarkers for NASH
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Journal Article
Characterization and Proteome of Circulating Extracellular Vesicles as Potential Biomarkers for NASH
2020
Overview
Nonalcoholic fatty liver disease (NAFLD) is currently one of most common forms of chronic liver disease globally. NAFLD represents a wide spectrum of liver involvement from nonprogressive isolated steatosis to nonalcoholic steatohepatitis (NASH), characterized by liver necroinflammation and fibrosis and currently one of the top causes of end‐stage liver disease and hepatocellular carcinoma. At present, there is a lack of effective treatments, and a central barrier to the development of therapies is the requirement for an invasive liver biopsy for diagnosis of NASH. Discovery of reliable, noninvasive biomarkers are urgently needed. In this study, we tested whether circulating extracellular vesicles (EVs), cell‐derived small membrane‐surrounded structures with a rich cargo of bioactive molecules, may serve as reliable noninvasive “liquid biopsies” for NASH diagnosis and assessment of disease severity. Total circulating EVs and hepatocyte‐derived EVs were isolated by differential centrifugation and size‐exclusion chromatography from serum samples of healthy individuals, patients with precirrhotic NASH, and patients with cirrhotic NASH. EVs were further characterized by flow cytometry, electron microscopy, western blotting, and dynamic light scattering assays before performing a proteomics analysis. Our findings suggest that levels of total and hepatocyte‐derived EVs correlate with NASH clinical characteristics and disease severity. Additionally, using proteomics data, we developed understandable, powerful, and unique EV‐based proteomic signatures for potential diagnosis of advanced NASH. Conclusion: Our study shows that the quantity and protein constituents of circulating EVs provide strong evidence for EV protein–based liquid biopsies for NAFLD/NASH diagnosis. Circulating liver‐derived extracellular vesicles (EVs) are released in patients with advanced nonalcoholic steatohepatitis (NASH) and correlate with disease outcomes. Analysis of EV protein cargo identified potential multiprotein signatures that can be used as noninvasive biomarkers as an alternative to costly and invasive liver biopsy.
Publisher
Wolters Kluwer Health Medical Research, Lippincott Williams & Wilkins,John Wiley and Sons Inc,Wolters Kluwer Health/LWW
