The bitter side of sweet: the role of Galectin-9 in immunopathogenesis of viral infections

Reviews in Medical Virology
Shahzma MeraniShokrollah Elahi

Abstract

In recent years, a critical role for β-galactoside-binding protein, Galectin-9 (Gal-9) has emerged in infectious disease, autoimmunity, and cancer. It is a ligand for T cell immunoglobulin mucin domain 3 (Tim-3), a type-I glycoprotein that is persistently expressed on dysfunctional T cells during chronic viral infections. Gal-9 exerts its pivotal immunomodulatory effects by inducing apoptosis or suppressing effector functions via engagement with its receptor, Tim-3. Recent studies report elevation of circulating Gal-9 in humans infected with different viral infections. Interaction of soluble Gal-9 with Tim-3 expressed on the surface of activated CD4+ T cells renders them less susceptible to HIV-1 infection, while enhanced HIV infection occurs when Gal-9 interacts with a different receptor than Tim-3. This indicates the versatile role of Gal-9 in viral pathogenesis. For instance, higher expression of Tim-3 during chronic viral infection and elevation of plasma Gal-9 may have evolved to limit persistent immune activation and pathogenic T cells activity. In contrast, Gal-9 can suppress the effectiveness of immunity against viral infections. In agreement, Gal-9 knockout mice mount a more robust and vigorous virus-specific immune re...Continue Reading

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