Dexamethasone Stimulates Hepatitis B Virus (HBV) Replication Through Autophagy

Area of Science:

• Hepatology
• Virology
• Cell Biology

Background:

• Hepatitis B virus (HBV) reactivation is a serious complication of chemotherapy and immunosuppression.
• The precise mechanisms driving chemotherapy-induced HBV reactivation remain largely unknown.

Purpose of the Study:

• To investigate the role of autophagy in dexamethasone-induced HBV replication and reactivation.
• To elucidate the molecular pathways linking glucocorticoids, autophagy, and HBV.

Main Methods:

• HepG2.2.15 cells were treated with dexamethasone, rapamycin (autophagy inducer), and 3-methyladenine (3-MA, autophagy inhibitor).
• Autophagosome formation was visualized using transmission electron microscopy (TEM).
• Protein levels (LC3-I, LC3-II, P62) were assessed by western blot; HBV replication intermediates by southern blot; HBV DNA by real-time PCR; and HBsAg by ELISA.

Main Results:

• Dexamethasone treatment significantly increased HBV replication and protein expression in HepG2.2.15 cells.
• This dexamethasone-induced effect was mediated by the induction of autophagy.
• The autophagy inhibitor 3-MA effectively blocked HBsAg secretion stimulated by dexamethasone.

Conclusions:

• Dexamethasone promotes HBV replication and reactivation by inducing autophagy.
• These findings highlight a novel mechanism of glucocorticoid-mediated HBV reactivation via autophagy.
• Targeting autophagy presents a potential therapeutic strategy for preventing HBV reactivation in patients receiving glucocorticoids.