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- W1846315129 abstract "Cryptococcal meningitis occurs in 6 to 8% of human immunodeficiency virus-infected individuals. Despite the availability of powerful antifungal agents that are active against Cryptococcus neoformans, these drugs generally fail to cure cryptococcal infections in immunocompromised hosts. Alternative approaches to prevention and therapy of cryptococcosis are urgently needed. Complement promotes phagocytosis of C. neoformans, but human antibodies to cryptococcal capsular polysaccharide have not been shown to function as complement-independent opsonins. The goal of our studies was to characterize the in vitro biological function of human antibodies to glucuronoxylomannan (GXM) from individuals immunized with a GXM-tetanus toxoid (GXM-TT) vaccine. We studied sera from nine vaccinees that manifested good serologic responses to GXM-TT. The results indicate that GXM-TT-elicited antibodies promote phagocytosis of C. neoformans by both murine J774 cells and human peripheral blood mononuclear cells (PBMCs). The two sera with the highest titers of anti-GXM immunoglobulin G2 antibodies were the most opsonic. When PBMC Fc gamma RIIa receptors were blocked, a 75% decrease in phagocytosis occurred following incubation of the PBMCs with C. neoformans opsonized with these sera. Our data indicate that, in the absence of complement, human anti-GXM-TT antibodies are opsonic and that antibodies of the immunoglobulin G2 isotype are effective opsonins." @default.
- W1846315129 created "2016-06-24" @default.
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- W1846315129 date "1996-09-01" @default.
- W1846315129 modified "2023-10-16" @default.
- W1846315129 title "Opsonization of Cryptococcus neoformans by human anticryptococcal glucuronoxylomannan antibodies" @default.
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- W1846315129 doi "https://doi.org/10.1128/iai.64.9.3446-3450.1996" @default.
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