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. 1993 Jan;59(1):34–39. doi: 10.1128/aem.59.1.34-39.1993

Inhibition of adhesion of Escherichia coli K88 to piglet ileal mucus by Lactobacillus spp.

L Blomberg 1, A Henriksson 1, P L Conway 1
PMCID: PMC202051  PMID: 8439162

Abstract

Enteropathogenic Escherichia coli K88 colonizing the piglet ileum adhere to the mucosa by K88 fimbrial appendages. A recent study in our laboratory has implicated indigenous lactobacilli in the suppression of the colonization potential of enteropathogenic E. coli as measured by adhesion to ileal mucus. The aim of this study was to investigate the effect of Lactobacillus spp. of porcine origin on the adhesion of K88 fimbriae of E. coli. With an in vitro assay, the adhesion of E. coli K88ab strain G1108E and E. coli K88ac strain 1107 to 35-day-old piglet ileal mucus was studied in the presence of spent culture fluid of Lactobacillus spp. Detailed studies focused specifically on culture fluid of Lactobacillus fermentum 104R. Subsequently, the ileal mucus was exposed to the retentate of the spent culture fluid after dialysis and fractionation. Adhesion was confirmed to be attributable to K88 fimbriae when K88-specific monoclonal antibodies and isogenic mutants of E. coli K-12 with and without the plasmid containing the K88 gene were used. The active component was characterized by pretreatment of dialysis retentate with heat, periodate, pronase, and centrifugation, as well as by growth of the lactobacillus in various media and by assays at both 0 and 37 degrees C. All three lactobacilli of porcine origin reduced adhesion of E. coli K88 by approximately 50%. Inhibition occurred when mucus was pretreated with either spent culture dialysis retentate or the void volume (fraction of > 250,000 molecular weight) after gel filtration. The activity of the dialysis retentate was sensitive to pronase, but there was still activity at 0 degrees C.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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