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Alcian Blue (AB), a phthalocyanine derivative, is able to prevent infection by a wide spectrum of human immunodeficiency virus type 1 (HIV-1), HIV-2, and simian immunodeficiency virus strains in various cell types [T cells, (co)receptor-transfected cells, and peripheral blood mononuclear cells]. With the exception of herpes simplex virus, AB is inactive against a broad variety of other (DNA and RNA) viruses. Time-of-addition studies show that AB prevents HIV-1 infection at the virus entry stage, exactly at the same time as carbohydrate-binding agents do. AB also efficiently prevents fusion between persistently HIV-1-infected HUT-78 cells and uninfected (CD4(+)) lymphocytes, DC-SIGN-directed HIV-1 capture, and subsequent transmission to uninfected (CD4(+)) T lymphocytes. Prolonged passaging of HIV-1 at dose-escalating concentrations of AB resulted in the selection of mutant virus strains in which several N-glycans of the HIV-1 gp120 envelope were deleted and in which positively charged amino acid mutations in both gp120 and gp41 appeared. A mutant virus strain in which four N-glycans were deleted showed a 10-fold decrease in sensitivity to the inhibitory effect of AB. These data suggest that AB is likely endowed with carbohydrate-binding properties and can be considered an important lead compound in the development of novel synthetic nonpeptidic antiviral drugs targeting the glycans of the envelope of HIV.

antimicrobial agents and chemotherapy

The Phthalocyanine Prototype Derivative Alcian Blue Is the First Synthetic Agent with Selective Anti-Human Immunodeficiency Virus Activity Due to Its gp120 Glycan-Binding Potential