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Interferon Alpha Induces Cellular Autophagy and Modulates Hepatitis B Virus Replication.
Jia Li1, Thekla Kemper1, Ruth Broering2
1Insititute for Virology, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
Frontiers in Cellular and Infection Microbiology
|February 21, 2022
Summary
High doses of Interferon alpha 2a (IFNα-2a) may hinder chronic Hepatitis B virus (HBV) treatment by interfering with cellular signaling and promoting autophagy, potentially increasing HBV replication.
Area of Science:
- Hepatology
- Virology
- Cellular Biology
Background:
- Hepatitis B virus (HBV) infection leads to severe liver diseases, including hepatocellular carcinoma (HCC).
- Interferon alpha 2a (IFNα-2a) is a common treatment for chronic HBV, but its efficacy is limited.
- The precise molecular mechanisms underlying IFNα-2a treatment success or failure are not fully understood.
Purpose of the Study:
- To investigate how increasing doses of IFNα-2a modulate cellular signaling pathways and HBV replication in hepatic cells.
- To explore the interplay between IFNα signaling, Akt/mTOR, AMPK, and autophagy.
- To determine the effect of IFNα-2a on HBV replication and gene expression in HepG2.2.15 cells.
Main Methods:
- Treatment of HepG2.2.15 cells with varying concentrations of IFNα-2a.
- Analysis of Akt/mTOR and AMPK signaling pathway activities.
- Assessment of autophagosome formation and autophagic degradation.
- Investigation of autophagy inhibition using 3-methyladenine (3-MA) and varying glucose concentrations.
- Evaluation of IFNα-2a-induced ISG15 and IFITM1 expression.
- Quantification of HBV replication and gene expression.
Main Results:
- IFNα-2a (6000 U/ml) downregulated Akt/mTOR and AMPK signaling.
- IFNα-2a treatment promoted autophagosome formation by inhibiting degradation.
- IFNα-2a initiated autophagy under varying glucose conditions, affecting ISG15 and IFITM1 expression.
- Despite ISG induction, high-dose IFNα-2a slightly increased HBV replication and gene expression in HepG2.2.15 cells.
Conclusions:
- IFNα-2a interferes with multiple intracellular signaling pathways, including Akt/mTOR and AMPK.
- IFNα-2a facilitates autophagy initiation and blocks its degradation, impacting cellular processes.
- High-dose IFNα-2a may paradoxically enhance HBV replication, suggesting complex treatment interactions.
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