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. 1992 Jan;60(1):206–212. doi: 10.1128/iai.60.1.206-212.1992

Mucosal immune response to RDEC-1 infection: study of lamina propria antibody-producing cells and biliary antibody.

C E McQueen 1, E C Boedeker 1, M Le 1, Y Hamada 1, W R Brown 1
PMCID: PMC257524  PMID: 1345908

Abstract

Infection of rabbits with Escherichia coli RDEC-1 is a useful model for diarrheal disease caused by mucosally attaching E. coli. Understanding of the protective immunity induced by RDEC-1 infection in rabbits should provide information useful in the design of vaccines for protection against this infection and other mucosally attaching organisms as well. Thus, to define the time course and location of specific immunoglobulin A secretion in relation to bacterial colonization during primary RDEC-1 infection, we infected rabbits with RDEC-1, which express AF/R1 adherence pili, and compared sites of anti-AF/R1 antibody-containing cells in the intestinal mucosa with the sites of luminal colonization and mucosal attachment of RDEC-1. Also, anti-AF/R1 antibodies in intestinal fluids and bile were measured by enzyme-linked immunosorbent assay, and attachment sites of RDEC-1 to the intestinal epithelium were determined by immunohistochemical examination. Anti-AF/R1 pilus antibody-containing cells were most numerous in the proximal intestine (duodenum and jejunum). In contrast, both luminal colonization and attachment of RDEC-1 to epithelial cells were densest in the distal intestine (cecum and colon). Anti-AF/R1 antibodies were present in approximately equal amounts in fluids collected from all levels of the gut after week 1 postinfection. Anti-AF/R1 antibody levels in undiluted bile exceeded those in gut flushes by at least 2 orders of magnitude. Loss of RDEC-1 attachment to epithelial cells preceded resolution of diarrheal illness despite the presence of large numbers of organisms in the intestinal lumen. Our studies indicate that during RDEC-1 infection (i) sites of greatest mucosal anti-AF/R1 antibody secretion are proximal to sites of maximal RDEC-1 luminal colonization and attachment, (ii) bile is a major source of specific antibodies in the intestinal lumen, and (iii) interference with RDEC-1 attachment to epithelial cells may permit resolution of disease.

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Selected References

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