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The Journal of Immunology, Vol 128, Issue 5 2183-2186, Copyright © 1982 by American Association of Immunologists

ARTICLES

Hepatobiliary transport of IgA immune complexes: molecular and cellular aspects

TA Brown, MW Russell and J Mestecky

The molecular and cellular parameters of the transport of IgA immune complexes (IgA-IC) from the circulation to the bile in vivo were studied in mice. Polymeric MOPC 315 IgA was effective in the transport of 125I-DNP-HSA into the bile, whereas complexes containing monomeric IgA were not transported. The transport to IgA-IC could be blocked by excess from IgA of different antigen specificity, but not by IgG or IgM. Hepatobiliary transport did not appear to involve the galactose- or mannose-specific glycoprotein receptors of the liver. No differences in IgA-IC transport, relative to controls, could be seen in mice that had been treated with cobra venom factor or whose mononuclear phagocytic system had been blockaded with colloidal carbon. These data suggested that the hepatobiliary transport of IgA-IC proceeds by a mechanism similar to the selective transport of free polymeric IgA through the hepatocyte.


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