Comparison of in vitro models to study bacterial adhesion to the intestinal epithelium
Article first published online: 25 AUG 2009
© 2009 The Authors. Journal compilation © 2009 The Society for Applied Microbiology
Letters in Applied Microbiology
Volume 49, Issue 6, pages 695–701, December 2009
How to Cite
Laparra, J.M. and Sanz, Y. (2009), Comparison of in vitro models to study bacterial adhesion to the intestinal epithelium. Letters in Applied Microbiology, 49: 695–701. doi: 10.1111/j.1472-765X.2009.02729.x
- Issue published online: 10 NOV 2009
- Article first published online: 25 AUG 2009
- 2009/1030: received 9 June 2009, revised 14 July 2009 and accepted 13 August 2009
- intestinal mucin;
Aims: To evaluate the adhesion ability of intestinal bacteria to different in vitro models of intestinal epithelia, and to estimate the suitability of these models and the type of interactions involved.
Methods and results: The adhesion of probiotic (Lactobacillus rhamnosus GG and Bifidobacterium animalis subsp. lactis Bb12), commensal (B. animalis IATA-A2 and B. bifidum IATA-ES2) and potentially pathogenic bacteria (E. coli and L. monocytogenes) was determined. The adhesion models used were polycarbonate-well plates, with or without mucin, and different configurations of Caco-2 and/or HT29-MTX cell cultures. All bacteria adhered to wells without mucin (2·6–27·3%), the values being highly variable depending on the bacterial strain. Adhesion percentages of potentially probiotic bacteria to Caco-2 cultures were remarkably lower (P < 0·05) than those to mucin, and more similar to those of pathogenic strains. The lowest adhesion of different bacterial strains was detected on HT29-MTX (0·5–2·3%) cultures and Caco-2/HT29-MTX (0·6–3·2%) cocultures, while these values were increased in Caco-2 cultures plus mucin.
Conclusions: The results suggested that bacterial strains exhibit different capacities to adhere to cellular components and several types of mucin present in different models, showing preferences for intestinal MUC2.
Significance and impact of the study: The use of Caco-2 cells monolayer plus mucin (type II) better approaches the physiological characteristics of in vivo situation, providing a reliable and suitable in vitro model to evaluate bacterial adhesion.