Human-derived probiotic Lactobacillus reuteri demonstrate antimicrobial activities targeting diverse enteric bacterial pathogens.
Lactobacillus reuteri is a commensal-derived anaerobic probiotic that resides in the human gastrointestinal tract. L. reuteri converts glycerol into a potent broad-spectrum antimicrobial compound, reuterin, which inhibits the growth of gram-positive and gram-negative bacteria. In this study, we compared four human-derived L. reuteri isolates (ATCC 55730, ATCC PTA 6475, ATCC PTA 4659 and ATCC PTA 5289) in their ability to produce reuterin and to inhibit the growth of different enteric pathogens in vitro. Reuterin was produced by each of the four L. reuteri strains and assessed for biological activity. The minimum inhibitory concentration (MIC) of reuterin derived from each strain was determined for the following enteric pathogens: enterohemorrhagic Escherichia coli, enterotoxigenic E. coli, Salmonella enterica, Shigella sonnei and Vibrio cholerae. We also analyzed the relative abilities of L. reuteri to inhibit enteric pathogens in a pathogen overlay assay. The magnitude of reuterin production did not directly correlate with the relative ability of L. reuteri to suppress the proliferation of enteric pathogens. Additional antimicrobial factors may be produced by L. reuteri, and multiple factors may act synergistically with reuterin to inhibit enteric pathogens.
Spinler
Jennifer K
JK
Department of Pathology, Baylor College of Medicine, One Baylor Plaza, Houston, TX, USA. jkspinle@texaschildrens.org
Taweechotipatr
Malai
M
Rognerud
Cheryl L
CL
Ou
Ching N
CN
Tumwasorn
Somying
S
Versalovic
James
J
D000898:Antibiosis; D054324:Enterohemorrhagic Escherichia coli / Q000187:drug effects; D054307:Enterotoxigenic Escherichia coli / Q000187:drug effects; D005260:Female; D005759:Gastroenteritis / Q000382:microbiology*; D005985:Glyceraldehyde / Q000031:analogs & derivatives* / Q000378:metabolism / Q000494:pharmacology; D006090:Gram-Negative Bacteria / Q000187:drug effects* / Q000254:growth & development / Q000472:pathogenicity; D006801:Humans; D007422:Intestines / Q000382:microbiology*; D052200:Limosilactobacillus reuteri / Q000254:growth & development / Q000378:metabolism*; D008826:Microbial Sensitivity Tests; D019936:Probiotics; D011407:Propane / Q000378:metabolism / Q000494:pharmacology*; D019779:Salmonella enterica / Q000187:drug effects; D012764:Shigella sonnei / Q000187:drug effects; D014734:Vibrio cholerae / Q000187:drug effects
C047158:3-hydroxypropionaldehyde; D005985:Glyceraldehyde; D011407:Propane