title: Lactobacillus fermentum isolated from human colonic mucosal biopsy inhibits the growth and adhesion of enteric and foodborne pathogens.
abstract: A number of Lactobacillus species are used as probiotic strains in order to benefit health. We have isolated L. fermentum from human colonic mucosal biopsy samples that possess antimicrobial activities against entroinvasive and foodborne pathogens such as Escherichia coli, Salmonella paratyphi A, Shigella sonnei, Staphylococcus aureus, Enterococcus faecalis, Proteus mirabilis, Pseudomonas aeruginosa, and Vibrio sp. In addition to lactic acid, L. fermentum secretes antimicrobial proteinacious compound(s) that was found to be active even at neutral pH (pH 7.0). The compound was sensitive to heat treatment and trypsin digestion. Lactobacillus fermentum inhibited the adhesion of enteropathogens to intestinal epithelial cells in vitro. Isolated cell surface associated proteins (SAPs) from L. fermentum were sufficient for the adhesion exclusions of enteropathogenic E. coli. Our results indicate that L. fermentum produces antimicrobial compounds and SAPs to inhibit the growth and adhesion of enteropathogens, respectively.
authors.affiliation: Amrita Inst. of Medical Sciences, Research Centre for Nanoscience and Molecular medicine, AIMS-Ponekkara, Edapally, Cochin, Kerala 682041, India.
authors.forename: Parvathi
authors.initials: P
authors.lastname: Varma
authors.forename: Kavitha R
authors.initials: KR
authors.lastname: Dinesh
authors.forename: Krishna K
authors.initials: KK
authors.lastname: Menon
authors.forename: Raja
authors.initials: R
authors.lastname: Biswas
mesh_terms: D000898:Antibiosis; D001422:Bacterial Adhesion; D002176:Candida albicans / Q000254:growth & development / Q000472:pathogenicity; D003106:Colon / Q000382:microbiology*; D013293:Enterococcus faecalis / Q000254:growth & development / Q000472:pathogenicity; D004926:Escherichia coli / Q000254:growth & development / Q000472:pathogenicity; D005506:Food Contamination / Q000032:analysis*; D005516:Food Microbiology / Q000379:methods*; D019073:HT29 Cells; D006801:Humans; D006863:Hydrogen-Ion Concentration; D052197:Limosilactobacillus fermentum / Q000302:isolation & purification* / Q000378:metabolism*; D009092:Mucous Membrane / Q000382:microbiology; D019936:Probiotics / Q000302:isolation & purification / Q000378:metabolism; D011513:Proteus mirabilis / Q000254:growth & development / Q000472:pathogenicity; D011550:Pseudomonas aeruginosa / Q000254:growth & development / Q000472:pathogenicity; D012482:Salmonella paratyphi A / Q000254:growth & development / Q000472:pathogenicity; D012764:Shigella sonnei / Q000254:growth & development / Q000472:pathogenicity; D013211:Staphylococcus aureus / Q000254:growth & development / Q000472:pathogenicity; D014733:Vibrio / Q000254:growth & development / Q000472:pathogenicity