Taurine ameliorates viral encephalitis by restoring PRKN-mediated mitophagy

Area of Science:

• Cellular biology
• Immunology
• Neuroscience

Background:

• Mitophagy maintains mitochondrial health and regulates antiviral immunity.
• Herpes simplex virus type 1 (HSV-1) infection is known to cause mitochondrial damage, but the underlying mechanisms and implications for viral encephalitis are not fully understood.

Purpose of the Study:

• To investigate the role of mitophagy in HSV-1 infection and viral encephalitis.
• To identify the viral mechanisms that disrupt mitophagy.
• To explore potential therapeutic strategies targeting mitophagy.

Main Methods:

• Investigated mitophagy defects in HSV-1 infected cells and mouse brain tissue.
• Analyzed the effect of viral proteins ICP34.5 and US11 on the EIF2S-ATF4-PRKN axis.
• Assessed the impact of mitophagy modulation on HSV-1 infection, neuroinflammation, and encephalitis severity.
• Examined the effect of taurine on mitophagy and HSV-1 infection.

Main Results:

• HSV-1 infection leads to damaged mitochondria accumulation due to defective mitophagy.
• Viral proteins ICP34.5 and US11 suppress PRKN expression by inhibiting the EIF2S-ATF4 axis, impeding mitophagy.
• Modulating mitophagy affects HSV-1 infection, NF-κB-mediated neuroinflammation, and encephalitis severity.
• Taurine promotes PRKN-mediated mitophagy, limiting HSV-1 infection in vitro and in vivo.

Conclusions:

• Mitophagy plays a protective role in restricting viral encephalitis.
• The ATF4-PRKN axis is a key regulator of mitophagy during HSV-1 infection.
• Targeting the ATF4-PRKN axis offers a potential therapeutic strategy for neurotropic virus-related diseases.