EBNA1 expression in a lung transplant recipient with hypocomplementemic urticarial vasculitis syndrome

Area of Science:

• Immunology
• Virology
• Transplantation

Background:

• Hypocomplementemic urticarial vasculitis syndrome (HUVS) is a rare autoimmune condition.
• Epstein-Barr virus (EBV) is a common herpesvirus with complex interactions in immunocompromised individuals.
• Lung transplantation involves significant immunosuppression, increasing risks of viral reactivation and complications.

Observation:

• A bilateral lung transplant recipient with HUVS exhibited persistent Epstein-Barr virus nuclear antigen 1 (EBNA1) expression in peripheral blood.
• EBNA1 expression, primarily Qp-initiated and crucial for EBV maintenance, was detected frequently post-transplantation.
• Antibody responses to EBNA1 epitopes were elevated pre-transplantation and remained significant post-transplantation compared to controls.

Findings:

• The study detected EBV-positive proliferating cells prior to intensive immunosuppressive therapy.
• Persistent EBNA1 expression was observed in 80% of peripheral blood samples, including on the day of transplantation.
• Qp-initiated EBNA1, vital for EBV persistence, was the predominant form identified.

Implications:

• The findings suggest a potential link between continuous EBNA1 expression and the autoimmune pathogenesis of HUVS.
• Continuous EBNA1 expression may not solely be a consequence of immunosuppression or post-transplant lymphoproliferative disease.
• Further research is warranted to explore the role of EBV and EBNA1 in the etiology and management of HUVS.