Title |
Characterization of Mucus-Related Properties of Streptococcus thermophilus: From Adhesion to Induction
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Published in |
Frontiers in Physiology, July 2018
|
DOI | 10.3389/fphys.2018.00980 |
Pubmed ID | |
Authors |
Neïké Fernandez, Laura Wrzosek, Joanna M. Radziwill-Bienkowska, Belinda Ringot-Destrez, Marie-Pierre Duviau, Marie-Louise Noordine, Valérie Laroute, Véronique Robert, Claire Cherbuy, Marie-Line Daveran-Mingot, Muriel Cocaign-Bousquet, Renaud Léonard, Catherine Robbe-Masselot, Françoise Rul, Eric Ogier-Denis, Muriel Thomas, Muriel Mercier-Bonin |
Abstract |
Mucus is a major component of the intestinal barrier involved both in the protection of the host and the fitness of commensals of the gut. Streptococcus thermophilus is consumed world-wide in fermented dairy products and is also recognized as a probiotic, as its consumption is associated with improved lactose digestion. We determined the overall effect of S. thermophilus on the mucus by evaluating its ability to adhere, degrade, modify, or induce the production of mucus and/or mucins. Adhesion was analyzed in vitro using two types of mucins (from pig or human biopsies) and mucus-producing intestinal HT29-MTX cells. The induction of mucus was characterized in two different rodent models, in which S. thermophilus is the unique bacterial species in the digestive tract or transited as a sub-dominant bacterium through a complex microbiota. S. thermophilus LMD-9 and LMG18311 strains did not grow in sugars used to form mucins as the sole carbon source and displayed weak binding to mucus/mucins relative to the highly adhesive TIL448 Lactococcus lactis. The presence of S. thermophilus as the unique bacteria in the digestive tract of gnotobiotic rats led to accumulation of lactate and increased the number of Alcian-Blue positive goblet cells and the amount of the mucus-inducer KLF4 transcription factor. Lactate significantly increased KLF4 protein levels in HT29-MTX cells. Introduction of S. thermophilusvia transit as a sub-dominant bacterium (103 CFU/g feces) in a complex endogenous microbiota resulted in a slight increase in lactate levels in the digestive tract, no induction of overall mucus production, and moderate induction of sulfated mucin production. We thus show that although S. thermophilus is a poor mucus-adhesive bacterium, it can promote mucus pathway at least in part by producing lactate in the digestive tract. |
X Demographics
Geographical breakdown
Country | Count | As % |
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Switzerland | 1 | 20% |
France | 1 | 20% |
Unknown | 3 | 60% |
Demographic breakdown
Type | Count | As % |
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Members of the public | 5 | 100% |
Mendeley readers
Geographical breakdown
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Unknown | 36 | 100% |
Demographic breakdown
Readers by professional status | Count | As % |
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Student > Ph. D. Student | 9 | 25% |
Student > Bachelor | 5 | 14% |
Other | 4 | 11% |
Student > Master | 4 | 11% |
Researcher | 2 | 6% |
Other | 3 | 8% |
Unknown | 9 | 25% |
Readers by discipline | Count | As % |
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Biochemistry, Genetics and Molecular Biology | 7 | 19% |
Agricultural and Biological Sciences | 6 | 17% |
Medicine and Dentistry | 4 | 11% |
Immunology and Microbiology | 3 | 8% |
Engineering | 2 | 6% |
Other | 4 | 11% |
Unknown | 10 | 28% |