Receptor-mediated clearance of Aspergillus galactomannan.
The fate of radiolabeled Aspergillus fumigatus galactomannan was studied after intravenous injection into rabbits and rats. At 1 hr, the liver contained 35% of the injected dose in rabbits and 30% in rats. Excretion of galactomannan into the urine, measured in rabbits, was another major catabolic route and accounted for 35% of the dose by 24 hr. Immunization of rabbits increased hepatic uptake and decreased urinary excretion. Hepatic uptake in unimmunized rats could be decreased by Saccharomyces cerevisiae mannan, alpha-methyl mannoside, and N-acetylglucosamine, known inhibitors of the macrophage mannose receptor. Autoradiography showed hepatic radiolabeled galactomannan to be concentrated in Kupffer cells, which express the mannosyl receptor for glycoproteins. Macrophage mannosyl receptors may constitute a general mechanism for clearing fungal mannans from the bloodstream.[1]References
- Receptor-mediated clearance of Aspergillus galactomannan. Bennett, J.E., Friedman, M.M., Dupont, B. J. Infect. Dis. (1987) [Pubmed]
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