Receptor-Mediated Clearance of Aspergillus Galactomannan

John E. Bennett, Marc M. Friedman, Bertrand Dupont

Research output: Contribution to journalArticle

Abstract

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, α-methylmannoside, and N-acetylglucosamine, known inhibitors of the macrophage mannose receptor. Autoradiography showed hepatic radiolabeled galactomannan to be concentrated in Kupffer cells, whichexpress the mannosyl receptor for glycoproteins. Macrophage mannosyl receptors may constitute a general mechanism for clearing fungal mannans from the bloodstream.

Original languageEnglish (US)
Pages (from-to)1005-1010
Number of pages6
JournalJournal of Infectious Diseases
Volume155
Issue number5
DOIs
StatePublished - May 1987

ASJC Scopus subject areas

  • Immunology and Allergy
  • Infectious Diseases

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