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Yeast Cell Wall Mannan Rich Fraction Reduces the Ability of Enterotoxigenic E.coli (ETEC) to Attach to Porcine Intestinal Cells.
Briefly, IPEC J2 cells (2*104 passage 10-18) were cultured on 6 well plates using CO2 independent medium pH 6.8. The adhesion test consisted of incubation of the MRF (16mg/mL) with the bacteria, this mixture was then added to the IPEC-J2 cell monolayer followed by 30 min incubation (at 37◦C and 5% of CO2) with the cell monolayer. After washing the IPEC-J2 lysates were collected, which consisted of bacteria which adhered to the cells and invaded the cells, and plated on plate count agar, after overnight culturing colonies were counted, the adhesion test was repeated on three different days for each strain of E.coli.
Adhesion tests with three different strains of E.coli were performed; E.coli 17076, 10674 and 10964 each of which carried fimbrae. MRF shows a clear ability to reduce the number of E.coli cells which adhered to the IPEC-J2 cells. In the case of strain 17076 the adherent cells decreased from 1.51x106 CFU in the control untreated IPEC cells to 2.19 x105 with the Actigen treatment this represents a significant seven fold reduction in attachment p< 0.05. In the case of strain 10674 the adherent cells decreased from 1.43 x106 CFU in the control untreated IPEC cells to 5.28 x104 with the Actigen treatment this represents a 28 fold reduction in attachment of E.coli P< 0.05 and for strain 10964 a fivefold reduction in attachment of E.coli to the IPCE cells was noted P<0.05.
These results indicate that in this study yeast mannan rich fraction (Actigen) reduced E.coli adherence to intestinal cells in-vitro. In addition these data suggests that inclusion of MRF in the diets of pigs could potentially support functional activity against E.coli infection.