title: Behavior of lactobacilli isolated from fermented slurry (ben-saalga) in gnotobiotic rats.
abstract: Most bacterial strains, which have been studied so far for their probiotic functions, are extensively used by manufacturers in developed countries. In our work, we sought to study a mix (called BSL) comprising three strains belonging to Lactobacillus fermentum, L. paraplantarum and L. salivarius, that were isolated from a traditional African pearl millet based fermented slurry. Our objective was to study this BSL cocktail in gnotobiotic rats, to evaluate their survival and their behavior in the digestive tract conditions. After a single oral inoculation of germfree rats with BSL, the species established stably in the digestive tract with the following hierarchy of abundance: L. salivarius> L. plantarum> L. fermentum. BSL cocktail was metabolically active since it produced 50 mM lactate and it expressed genes involved in binding mechanism in the caecum. Furthermore, the global morphology of the colon epithelium was not disturbed by the BSL cocktail. BSL cocktail did not modify mucus content and host mucus-related genes (MUC1, MUC2, MUC3 or resistin-like molecule β). The cocktail of lactobacilli enhanced the proliferating cell nuclear antigen (PCNA) at a level comparable to what was observed in conventional rats. PCNA was involved in proliferation and DNA repair, but the presence of the cocktail did not provoke proliferative events (with Ki67 as indicator), so we suppose BSL may help gut preservation. This work is the first step towards the selection of strains that are derived from traditional fermented food to formulate new probiotic mixture.
authors.affiliation: IRD, UMR NUTRIPASS, IRD/Montpellier2/Montpellier1, Montpellier, France. williams.turpin@utoronto.ca
authors.forename: Williams
authors.initials: W
authors.lastname: Turpin
authors.forename: Christèle
authors.initials: C
authors.lastname: Humblot
authors.forename: Marie-Louise
authors.initials: ML
authors.lastname: Noordine
authors.forename: Laura
authors.initials: L
authors.lastname: Wrzosek
authors.forename: Julie
authors.initials: J
authors.lastname: Tomas
authors.forename: Camille
authors.initials: C
authors.lastname: Mayeur
authors.forename: Claire
authors.initials: C
authors.lastname: Cherbuy
authors.forename: Jean-Pierre
authors.initials: JP
authors.lastname: Guyot
authors.forename: Muriel
authors.initials: M
authors.lastname: Thomas
mesh_terms: D000818:Animals; D002453:Cell Cycle; D049109:Cell Proliferation; D003106:Colon / Q000166:cytology / Q000382:microbiology; D005285:Fermentation; D005511:Food Handling; D015964:Gene Expression Regulation, Bacterial; D005856:Germ-Free Life; D007413:Intestinal Mucosa / Q000166:cytology / Q000382:microbiology; D019344:Lactic Acid / Q000096:biosynthesis; D007778:Lactobacillus / Q000235:genetics / Q000302:isolation & purification* / Q000378:metabolism / Q000502:physiology*; D008297:Male; D050296:Microbial Viability; D009077:Mucins / Q000378:metabolism; D031782:Pennisetum / Q000378:metabolism*; D051381:Rats
chemical_list: D009077:Mucins; D019344:Lactic Acid