β-Arrestin 2 protects against neurological function defects in HSV-1-induced encephalitis mice

Area of Science:

• Neuroimmunology
• Molecular Biology
• Virology

Background:

• Herpes simplex encephalitis (HSE) pathogenesis requires further elucidation.
• β-Arrestin 2 (Arrb2) modulates immune responses, but its role in microglial cells during HSE is unknown.

Purpose of the Study:

• To investigate the pathophysiological role of Arrb2 in experimental HSE.
• To determine the effect of Arrb2 on microglial activation and inflammatory responses in HSE.

Main Methods:

• Utilized experimental HSE mouse models.
• Analyzed Arrb2 expression in microglia post-HSV-1 infection.
• Compared outcomes in Arrb2-overexpressing transgenic mice versus wild-type mice.

Main Results:

• Arrb2 expression decreased in microglia 48 hours after HSV-1 infection.
• Arrb2 overexpression significantly reduced mortality and improved survival rates by 40% in HSE mice.
• Arrb2 suppressed pro-inflammatory cytokines (TNF-α, IL-6), enhanced anti-inflammatory cytokines (IL-10, IL-4), inhibited NF-κB activation, attenuated blood-brain barrier breakdown, reduced cerebral edema, and improved neurological function.

Conclusions:

• Arrb2 promotes an M2 microglial phenotype, dampens neuroinflammation, preserves blood-brain barrier integrity, and ameliorates neurological deficits in HSE.
• Arrb2 is a protective factor against HSV-1-induced brain damage and mortality, suggesting its therapeutic potential for HSE.