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. 1983 Dec;54(3):671–680.

IgA plasma cells in biliary mucosa: a likely source of locally synthesized IgA in human hepatic bile.

H Nagura, Y Tsutsumi, H Hasegawa, K Watanabe, P K Nakane, W R Brown
PMCID: PMC1536144  PMID: 6418423

Abstract

IgA synthesized in hepatobiliary tissues accounts for about one-half of the IgA present in human hepatic bile, but the location of the IgA synthesizing cells has been in doubt because few plasma cells are present in normal liver. Therefore, we immunocytochemically localized IgA, J chain and secretory component in bile duct tissues of six patients operated upon for biliary duct obstruction. Numerous plasma cells containing IgA and J chain were found surrounding the accessory glands of the major bile ducts and in the area just beneath the surface epithelium of the ducts. At the ultrastructural level, IgA and SC in the epithelial cells had the features characteristic of secretory component-mediated endocytic translocation of IgA. We conclude that plasma cells in biliary duct mucosa are the likely source of much of the locally synthesized IgA that is secreted into human hepatic bile. The IgA probably reaches the bile by direct transfer across biliary epithelium.

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