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Applied and Environmental Microbiology, September 2000, p. 3692-3697, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Quantitative Approach in the Study of Adhesion of Lactic Acid Bacteria to Intestinal Cells and Their Competition with Enterobacteria

Y. K. Lee,1,* C. Y. Lim,1 W. L. Teng,1 A. C. Ouwehand,2 E. M. Tuomola,3 and S. Salminen2

Department of Microbiology, Faculty of Medicine, National University of Singapore, Singapore 117597, Republic of Singapore,1 and Department of Biochemistry and Food Chemistry, University of Turku, FIN-20014 Turku,2 and Novatreat Inc., FIN-20700 Turku,3 Finland

Received 10 May 2000/Accepted 20 June 2000

To describe the phenomena of bacterial adhesion to intestinal cells and the competition for adhesion between bacteria, mathematical equations based on a simple dissociation process involving a finite number of bacterial receptors on intestinal cell surface were developed. The equations allow the estimation of the maximum number of Lactobacillus sp. and Escherichia coli cells that can adhere to Caco-2 cells and intestinal mucus; they also characterize the affinity of the bacteria to Caco-2 cells and intestinal and fecal mucus and the theoretical adhesion ratio of two bacteria present in a mixed suspension. The competition for adhesion between Lactobacillus rhamnosus GG and E. coli TG1 appeared to follow the proposed kinetics, whereas the competition between Lactobacillus casei Shirota and E. coli TG1 may involve multiple adhesion sites or a soluble factor in the culture medium of the former. The displacement of the adhered Lactobacillus by E. coli TG1 seemed to be a rapid process, whereas the displacement of E. coli TG1 by the Lactobacillus took more than an hour.

* Corresponding author. Mailing address: Department of Microbiology, National University of Singapore, 5 Science Drive 2, Singapore 117597, Republic of Singapore. Phone: 65-874 3284. Fax: 65-776 6872. E-mail: MICLEEYK{at}NUS.EDU.SG.

Applied and Environmental Microbiology, September 2000, p. 3692-3697, Vol. 66, No. 9
0099-2240/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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