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Antigen absorption in rabbit bacterial diarrhea (RDEC-1)

In vitro modifications in ileum and Peyer's patches

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Abstract

Intestinal absorption of antigenic (intact) and degraded β-lactoglobulin and horseradish peroxidase was studied in rabbits experimentally infected at weaning with the rabbit-specific Escherichia coli strain RDEC-1 (015:NM). Trans epithelial fluxes of both proteins were measured at four stages after infection: early, peak, late, and recovery, on segments of ileum and Peyer's patches mounted in Ussing chambers. During this period of observation, absorption of antigenic β-lactoglobulin and intact horseradish peroxidase decreased significantly in the ileum and Peyer's patches of age-matched controls. No significant age-related decrease was observed in the controls for the transport of these proteins in degraded form. RDEC-1 infection caused, first, a rise in degraded protein fluxes across Peyer's patches only, during the early phase of the disease. Second, during the peak phase of infection, absorption of antigenic β-lactoglobulin by the ileum rose to 74.0 ng/hr/cm2 (90% confidence interval: 63.1, 86.8) vs 15.8 (5.8, 42.8) in the controls (P= 0.07), and absorption of intact horseradish peroxidase rose to 21.8 (16.5, 26.7) ng/hr/cm2 vs 4.4 (0.7, 26.6) in control ileum, (P=0.09). These rises, which were similar in Peyer's patches, delayed the physiologic decrease in protein absorption that occurs with age. These results indicate that increased antigen absorption is observed during bacterial diarrhea and that it might interfere with the immune responses of the host.

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Isolauri, E., Gotteland, M., Heyman, M. et al. Antigen absorption in rabbit bacterial diarrhea (RDEC-1). Digest Dis Sci 35, 360–366 (1990). https://doi.org/10.1007/BF01537415

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