Related Experiment Video
Updated: Apr 23, 2026
A Competent Hepatocyte Model Examining Hepatitis B Virus Entry through Sodium Taurocholate Cotransporting Polypeptide as a Therapeutic Target
Published on: May 10, 2022
Mir-194 is a hepatocyte gate keeper hindering HCV entry through targeting CD81 receptor
Radwa Yehia Mekky1, Nada Magdy El-Ekiaby1, Mohammed Tarif Hamza2
1The Molecular Pathology Research Group, Department of Pharmacology and Toxicology, German University in Cairo, New Cairo City, Main Entrance Al Tagamoa Al Khames, 11835, Cairo, Egypt.
Objective:
The tetraspanin CD81 is one of the main receptors involved in hepatitis C virus entry. Herein, we aimed to explore the role of microRNAs in regulating CD81 receptor expression and function.
Patients And Methods:
Bioinformatics analysis was carried out to select potential mircroRNAs that binds CD81 3'untranslated region. Liver biopsies taken from 28 HCV genotype- 4 patients and 10 healthy donors were screened. Naïve, JFH1 and ED43/JFH1- infected- Huh7 cells were transfected with mimics and inhibitors followed by analyzing CD81 protein and mRNA expression. This was done using flow cytometry and Q-RT PCR, respectively. HCV entry into Huh7 cells was investigated post-transfection. Binding confirmation was done using luciferase reporter vector harboring wild/mutant target sites of microRNA. The impact of Epigallocatechin-gallate on modulating microRNA/CD81 expression was assessed.
Results:
Bioinformatics revealed that CD81 is a potential down-stream target for miR-194. A significant inverse correlation was found between miR-194 and CD81 expression in liver biopsies of HCV patients. Forcing the expression of miR-194 showed a down-regulation of CD81 protein, mRNA expression and significantly abrogated the HCV infectivity of Huh7 cells. Stimulation with EGCG enhanced mir-194 expression and down-regulated CD81 expression.
Conclusion:
This study showed that mir-194 hinders HCV entry through targeting CD81 receptors.
Insights
MicroRNA-194 (miR-194) inhibits hepatitis C virus (HCV) entry by targeting the CD81 receptor. This study demonstrates miR-194
Area of Science:
- Virology
- Molecular Biology
- Hepatology
Background:
- The tetraspanin CD81 is a key receptor mediating hepatitis C virus (HCV) entry into host cells.
- MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression and are implicated in viral pathogenesis.
Purpose of the Study:
- To investigate the role of miRNAs in regulating CD81 expression and function in the context of HCV infection.
- To identify specific miRNAs that target the CD81 receptor and modulate HCV entry.
Main Methods:
- Bioinformatic analysis to predict miRNA binding sites on the CD81 3' untranslated region.
- Screening of liver biopsies from HCV patients and healthy donors.
- In vitro experiments using cell lines transfected with miRNA mimics and inhibitors to assess CD81 expression and HCV infectivity.
- Luciferase reporter assays to confirm miRNA-target binding.
- Assessment of Epigallocatechin-gallate (EGCG) effects on miRNA and CD81 expression.
Main Results:
- Bioinformatics identified miR-194 as a potential regulator of CD81.
- A significant inverse correlation between miR-194 and CD81 expression was observed in HCV patient liver biopsies.
- Overexpression of miR-194 led to decreased CD81 expression and abrogated HCV infectivity in Huh7 cells.
- EGCG treatment increased miR-194 expression and consequently down-regulated CD81 levels.
Conclusions:
- miR-194 plays a crucial role in hindering HCV entry by targeting the CD81 receptor.
- Modulation of miR-194 expression represents a potential therapeutic strategy for HCV infection.
