Abstract
Background
The spectrum of nonalcoholic fatty liver disease (NAFLD) describes disease conditions deteriorating from nonalcoholic fatty liver (NAFL) to nonalcoholic steatohepatitis (NASH) to cirrhosis (CIR) to hepatocellular carcinoma (HCC). From a molecular and biochemical perspective, our understanding of the etiology of this disease is limited by the broad spectrum of disease presentations, the lack of a thorough understanding of the factors contributing to disease susceptibility, and ethical concerns related to repeat sampling of the liver. To better understand the factors associated with disease progression, we investigated by next-generation RNA sequencing the altered expression of microRNAs (miRNAs) in liver biopsies of class III obese subjects (body mass index ≥40 kg/m2) biopsied at the time of elective bariatric surgery.
Methods
Clinical characteristics and unbiased RNA expression profiles for 233 miRs, 313 transfer RNAs (tRNAs), and 392 miscellaneous small RNAs (snoRNAs, snRNAs, rRNAs) were compared among 36 liver biopsy specimens stratified by disease severity.
Results
The abundances of 3 miRNAs that were found to be differentially regulated (miR-301a-3p and miR-34a-5p increased and miR-375 decreased) with disease progression were validated by RT-PCR. No tRNAs or miscellaneous RNAs were found to be associated with disease severity. Similar patterns of increased miR-301a and decreased miR-375 expression were observed in 134 hepatocellular carcinoma (HCC) samples deposited in The Cancer Genome Atlas (TCGA).
Conclusions
Our analytical results suggest that NAFLD severity is associated with a specific pattern of altered hepatic microRNA expression that may drive the hallmark of this disorder: altered lipid and carbohydrate metabolism. The three identified miRNAs can potentially be used as biomarkers to access the severity of NAFLD. The persistence of this miRNA expression pattern in an external validation cohort of HCC samples suggests that specific microRNA expression patterns may permit and/or sustain NAFLD development to HCC.
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Acknowledgments
The National Institute of Diabetes And Digestive and Kidney Diseases of the National Institutes of Health supported the research reported in this publication, specifically through NIH grants DK020593 (Vanderbilt Diabetes Research and Training Center), 5UL1 RR024975-03 (CTSA), P30 CA68485 (Vanderbilt Ingram Cancer Center), DK058404 (Vanderbilt Digestive Disease Research Center), and R01 DK091748. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institutes of Health.
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Guo, Y., Xiong, Y., Sheng, Q. et al. A micro-RNA expression signature for human NAFLD progression. J Gastroenterol 51, 1022–1030 (2016). https://doi.org/10.1007/s00535-016-1178-0
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DOI: https://doi.org/10.1007/s00535-016-1178-0