Autoimmunity in dengue pathogenesis

Area of Science:

• * Virology
• * Immunology
• * Tropical Medicine

Background:

• * Dengue virus (DENV) is a significant vector-borne disease with expanding geographical reach due to climate change and travel.
• * DENV infection presents a spectrum of illness, from mild dengue fever to severe dengue hemorrhagic fever and shock syndrome.
• * Key clinical features of severe dengue include vascular leakage, low platelet counts (thrombocytopenia), and bleeding, with underlying mechanisms not fully elucidated.

Purpose of the Study:

• * To explore the immunopathogenesis of severe dengue disease.
• * To investigate the role of antibody-dependent enhancement (ADE) in DENV infection.
• * To understand the contribution of T-cell activation and autoantibody production to dengue's severe manifestations.

Main Methods:

• * Review of existing literature on dengue virus (DENV) infection and its immunopathogenesis.
• * Analysis of mechanisms including antibody-dependent enhancement (ADE), T-cell responses, and autoantibody generation.
• * Examination of molecular mimicry as a potential cause for autoantibody cross-reactivity.

Main Results:

• * Immunopathogenesis, beyond direct viral effects, significantly contributes to severe dengue.
• * Antibody-dependent enhancement (ADE) enhances DENV infection and can impair antiviral responses.
• * Aberrant T-cell activation and autoantibodies against host components (endothelial cells, platelets) promote vascular leakage and dysfunction.

Conclusions:

• * Severe dengue pathogenesis involves complex immune responses, including ADE and autoantibody formation.
• * Molecular mimicry may explain cross-reactivity in DENV-induced autoantibodies.
• * Consideration of these immunopathogenic complications is essential for the development of safe and effective dengue vaccines.