TNF-alpha-308A allele, a possible severity risk factor of hemorrhagic manifestation in dengue fever patients

Tissue Antigens
M T Fernández-MestreZ Layrisse

Abstract

Among the several hypothesis postulated to explain the pathogenesis of severe dengue disease, the model of immunopathogenesis is the most supported one with a likely important role played by the cascade of cytokines. This work describes single-nucleotide polymorphism of tumor necrosis factor (TNF)-alpha, interferon-gamma, interleukin (IL)-6, transforming growth factor-beta1, and IL-10 in patients with dengue virus infections and analyzes their relation with clinical manifestations of the disease. Because cytokine gene polymorphisms affect cytokine production, the significant increase of the TNF-308A allele we have observed among patients with dengue fever (DF) with hemorrhagic manifestations compared to patients with DF only indicates that the former patients are genetically predisposed to express higher levels of TNF-alpha. This finding supports studies reporting a possible association between elevated levels of circulating TNF, vascular permeability, and hemorrhage in patients with dengue hemorrhagic fever.

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