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  • Title: [Serum exosomal miRNAs profiling and functional study in patients with non-alcoholic fatty liver disease].
    Author: Zhang S, Liu YD, He ZD, Liu B, Linghu EQ.
    Journal: Zhonghua Gan Zang Bing Za Zhi; 2021 Oct 20; 29(10):987-994. PubMed ID: 34814394.
    Abstract:
    Objective: Differential expression of serum exosomal miRNAs were detected for NAFLD patients and healthy controls, thereby determining the role of serum exosomal miRNAs in the pathogenesis, diagnosis, and treatment of NAFLD. Methods: Four patients with S2-3 NAFLD who shared similar demographic features and personal histories, and matched healthy controls were recruited for high-throughput sequencing of serum exosomal miRNAs. Four miRNAs with the most significant differential expression were verified by qRT-PCR in three groups (S1, S2-3, and control groups) with 20 cases in each group. Target gene prediction was performed for these differentially-expressed miRNAs, along with GO and KEGG enrichment analyses for the target genes. T-test or ANOVA were used for normally distributed data. Wilcoxon rank sum test was used for ranked data and non-normally distributed data. The count data used Pearson chi-square test or Fisher's exact test. Results: There were 19 serum exosomal miRNAs with significantly different levels of expression (P < 0.05) and a fold-change > 2. The expression of hsa-miR-122-5p, hsa-miR-146b-5p, and hsa-miR-197-3P was highest in the S2-3 group, followed by the S1 and control groups (in order); hsa-miR-483-3p expression was higher in the NAFLD group (S1 or S2-3) than the control group. There were 84 pathways significantly enriched in target genes. From 20 pathways closely related to NAFLD, at least 5 target genes which were simultaneously correlated to all 10 pathways were screened (PIK3R2, AKT2, AKT3, MAPK1, and NFKB1). Conclusion: Differential expression of serum exosomal miRNAs was detected in NAFLD patients and healthy controls. Four miRNAs with the greatest fold-changes were assessed to judge the severity of fatty degeneration of the liver. The research findings provide reference for non-invasive identification of new biomarkers and specific targets for NAFLD treatment. 目的： 鉴定非酒精性脂肪性肝病（NAFLD）患者和健康对照组人血清外泌体微小RNAs（microRNAs）差异表达谱，探索miRNAs在NAFLD发病、诊断及治疗中的价值。 方法： 各取4例人口学特征、个人史相近的S2~3级NAFLD患者和健康对照者进行血清外泌体miRNAs高通量测序，对差异表达最显著的4条miRNAs按S1组、S2~3组、对照（Control）组每组各20例行qRT-PCR验证，并进行靶基因预测，对靶基因进行GO和KEGG富集分析。正态分布的计量资料使用t检验或方差分析，等级资料和非正态分布资料使用秩和检验，计数资料使用Pearson χ(2)检验或Fisher精确检验。 结果： 初步鉴定出差异有统计学意义（P < 0.05）且差异表达在2倍以上的血清外泌体miRNAs共19条，hsa-miR-122-5p、hsa-miR-146b-5p、hsa-miR-197-3P的相对表达关系为：S2~3组>S1组>Control组，hsa-miR-483-3p的相对表达关系为：NAFLD组（S1或S2~3）>Control组。GO分析显示靶基因在分子功能、细胞组分、生物过程均有广泛的注释，靶基因显著富集的通路共84条，从20条与NAFLD最密切的通路中筛选出与至少10条通路都相关的靶基因共5个，即PIK3R2、AKT2、AKT3、MAPK1、NFKB1。 结论： 初步分析了NAFLD患者和健康对照组血清外泌体miRNAs差异表达谱，研究了4条miRNAs对于判断肝脂肪变性程度的价值，预测了数以千计的靶基因及其参与的复杂信号通路，为寻找无创诊断NAFLD的生物标志物和特异性治疗的新靶点提供了新的参考。.
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