Competitive inhibition of three novel bacteria isolated from faeces of breast milk-fed infants against selected enteropathogens

• Published in: British journal of nutrition 2013-01, Vol.109 (S2), p.S63-S69
• Main Authors: Muñoz-Quezada, Sergio, Bermudez-Brito, Miriam, Chenoll, Empar, Genovés, Salvador, Gomez-Llorente, Carolina, Plaza-Diaz, Julio, Matencio, Esther, José Bernal, María, Romero, Fernando, Ramón, Daniel, Gil, Angel
• Format: Article
• Language: English
• Subjects: Antibiosis; Babies; Bacteria; Bifidobacterium - growth & development; Bifidobacterium - isolation & purification; Bifidobacterium - metabolism; Biological and medical sciences; Breast Feeding; Breast milk; Breastfeeding & lactation; Culture Media, Conditioned - metabolism; E coli; Enteropathogenic Escherichia coli - growth & development; Enteropathogenic Escherichia coli - pathogenicity; Enterotoxigenic Escherichia coli - growth & development; Enterotoxigenic Escherichia coli - pathogenicity; Feces; Feces - microbiology; Feeding. Feeding behavior; Functional foods & nutraceuticals; Fundamental and applied biological sciences. Psychology; Gastroenteritis - microbiology; Gastroenteritis - prevention & control; Humans; Hydrogen-Ion Concentration; Infant, Newborn; Infants; Lactobacillus - growth & development; Lactobacillus - isolation & purification; Lactobacillus - metabolism; Lactobacillus rhamnosus - growth & development; Lactobacillus rhamnosus - isolation & purification; Lactobacillus rhamnosus - metabolism; Microbial Viability; Milk; Pathogens; Probiotics - isolation & purification; Probiotics - metabolism; Probiotics - therapeutic use; Salmonella typhi - growth & development; Salmonella typhi - pathogenicity; Salmonella typhimurium - growth & development; Salmonella typhimurium - pathogenicity; Shigella sonnei - growth & development; Shigella sonnei - pathogenicity; Spain; Time Factors; Vertebrates: anatomy and physiology, studies on body, several organs or systems
• ISSN: 0007-1145; 1475-2662
• DOI: 10.1017/S0007114512005600

Numerous in vitro and in vivo studies conducted using different probiotic micro-organisms have demonstrated their ability to interfere with the growth and virulence of a variety of enteropathogens. The reported beneficial effects of the use of probiotics to complement antibiotic therapy or prevent diarrhoea or gastrointestinal infection in infants have increased in recent years. In the present study, we demonstrated the capacity of supernatants obtained from three novel probiotics (Lactobacillus paracasei CNCM I-4034, Bifidobacterium breve CNCM I-4035 and Lactobacillus rhamnosus CNCM I-4036) isolated from the faeces of breastfed infants to inhibit the growth of enterotoxigenic and enteropathogenic (EPEC) bacteria, such as Escherichia coli, Salmonella and Shigella. To assess their potential antimicrobial activity, the 17 and 24 h cell-free supernatants broth concentrates (10 × ) having 1, 2 or 4 % of the three probiotics were incubated with EPEC bacteria strains. After 17 h of co-culture, the supernatants were able to inhibit the growth of E. coli, Salmonella and Shigella up to 40, 55 and 81 %, respectively. However, the inhibitory capacity of some supernatants was maintained or completely lost when the supernatants (pH 3·0) were neutralised (pH 6·5). Overall, these results demonstrated that L. paracasei CNCM I-4034, B. breve CNCM I-4035 and L. rhamnosus CNCM I-4036 produce compounds that exhibited strain-specific inhibition of enterobacteria and have the potential to be used as probiotics in functional foods.