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Plasma miRNA-122-5p and miRNA-151a-3p identified as potential biomarkers for liver injury among CHB patients with PNALT.

BACKGROUND: Plasma microRNA (miRNA) levels may be altered during pathological processes; therefore, they may potentially serve as biomarkers for the diagnosis and prognosis of human diseases. This study aimed to explore whether plasma miRNAs may serve as new biomarkers for liver injury among chronic hepatitis B (CHB) patients with normal or nearly normal alanine aminotransferase (ALT) levels.

METHODS: Plasma miRNAs from each of three independent groups (no prominent liver injury and persistently normal ALT levels, NPNALT; significant liver injury with persistently normal ALT levels, SPNALT; and healthy) were profiled by miRNA microarray analysis. Differentially expressed miRNAs were then validated by a quantitative reverse transcription polymerase chain reaction (qRT-PCR) assay. The area under the receiver operating characteristic (AUC) curve was used to analyze the candidate miRNAs validated by qRT-PCR for diagnostic accuracy.

RESULTS: Twenty differentially expressed miRNAs were identified by microarray analysis. Seven miRNAs with elevated serum levels were validated by qRT-PCR analysis, and four of them were significantly different between the SPNALT and NPNALT groups. The AUCs of hsa-miR-122-5p and hsa-miR-151-3p were 0.877 (cutoff value = 13.38; 95% CI 0.792-0.963; sensitivity = 83.3%, specificity = 80%) and 0.882 (cutoff value = 7.4; 95% CI 0.797-0.966; sensitivity = 83.3%, specificity = 73.3%), respectively, indicating early liver injury. However, there was no significant correlation of miRNAs with either necroinflammation or fibrosis.

CONCLUSION: Serum hsa-miR-122-5p and hsa-miR-151-3p may function as new biomarkers for liver injury in SPNALT patients. With these two biomarkers, we may be able to identify a subset of patients who are experiencing liver injury but have normal ALT levels for further evaluation with a biopsy procedure.

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