ORF3 as a sensitive and specific diagnostic index for hepatitis E.

Area of Science:

• Virology
• Immunology
• Hepatology

Background:

• Hepatitis E virus (HEV) infection poses a significant global health challenge.
• Understanding the role of viral proteins in disease pathogenesis is crucial for developing effective diagnostics and treatments.

Purpose of the Study:

• To investigate the expression and diagnostic significance of HEV open reading frame 3 (ORF3) protein in a rat model of hepatitis E.
• To correlate ORF3 expression with disease severity, immune responses, and prognostic indicators.

Main Methods:

• Establishment of a HEV-infected Sprague-Dawley rat model with different time points post-infection.
• Measurement of HEV IgG and RNA, ORF3 protein expression in liver tissue.
• Quantification of adipokines (FAS, TIMP-2, ACE-2), Th1/Th2 cytokine balance (IFN-γ, IL-4), and immune cell populations (CD4+, CD8+, CD4+/CD8+ ratio).

Main Results:

• HEV ORF3 protein expression was significantly elevated in infected rats compared to controls.
• ORF3 expression positively correlated with disease severity markers (FAS, TIMP-2, Th1/Th2 balance) and negatively correlated with ACE-2 and CD4+/CD8+ ratio.
• Higher HEV IgG and RNA levels were observed in rats with higher ORF3 expression.

Conclusions:

• HEV ORF3 protein expression is directly linked to the severity and prognosis of hepatitis E.
• ORF3 protein demonstrates potential as a sensitive and specific biomarker for diagnosing HEV infection.