Beneficial effects of a strain of Lactobacillus paracasei subsp. paracasei in Staphylococcus aureus-induced intestinal and colonic injury
| Autor: | Nassim Madi, Farida Bendali, Djamila Sadoun |
|---|---|
| Jazyk: | angličtina |
| Předmět: |
Diarrhea
Microbiology (medical) Staphylococcus aureus food.ingredient Lactobacillus paracasei Colon Antibiotic resistance Administration Oral Biology medicine.disease_cause Microbiology Enterotoxins Feces chemistry.chemical_compound In vivo study food Bacteriocins Drug Resistance Bacterial Skimmed milk medicine Animals Humans Food microbiology Probiotics food and beverages General Medicine Staphylococcal Infections biology.organism_classification Coculture Techniques Anti-Bacterial Agents Lactic acid Intestines Lactobacillus Lactobacillus paracasei subsp. paracasei Milk Infectious Diseases chemistry Fermentation Models Animal Food Microbiology Potassium Rabbits medicine.symptom Antibiotic-associated diarrhea |
| Zdroj: | International Journal of Infectious Diseases. (11):e787-e794 |
| ISSN: | 1201-9712 |
| DOI: | 10.1016/j.ijid.2011.07.003 |
| Popis: | Summary Objectives The aim of this study was to investigate the in vitro and in vivo anti-staphylococcal activity of a lactic acid bacterial strain and its effect on the intestinal histological damage caused by Staphylococcus aureus infection. Methods Lactobacillus paracasei subsp. paracasei was isolated in our laboratory from breastfed newborn feces and identified phenotypically and genotypically. The strain was analyzed by spot-on-lawn and well diffusion assays for the production of bacteriocins against five antibiotic-resistant S. aureus strains isolated from the feces of hospitalized patients with antibiotic-associated diarrhea. The anti-staphylococcal activity of this strain was evaluated in fermented milk and in vivo using holoxenic rabbits. Results The strain was able to produce a bacteriocin-like substance active against the staphylococcal strains. A reduction of 2 log in S. aureus cell numbers was registered in co-culture with L. paracasei in fermented milk. Administration of skimmed milk containing S. aureus (10 7 cells/ml) to healthy rabbits induced a persistent diarrheal state 5 days after the challenge. Dissection of the rabbits and consequent histological observations showed damage and an atrophy of the intestinal and colonic mucosae of the diarrheal rabbits; in contrast an arrest of the diarrhea concomitant with recovery of the intestinal villi and the colonic crypts was observed in the rabbits treated with L. paracasei -fermented milk. Furthermore, the diarrheal state persisted in spite of a decrease in the level of S. aureus cells in the feces of the rabbits receiving sterile milk; this was in contrast to the rabbits treated with L. paracasei -fermented milk, in which the decrease in the S. aureus fecal number was associated with the arrest of the diarrhea. Conclusions L. paracasei could act as a potential barrier to prevent S. aureus - associated injury and might exert its effect on the staphylococcal enterotoxins or their target. |
| Databáze: | OpenAIRE |
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