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Table 1 Mechanisms of action of probiotics

From: Probiotic engineering: towards development of robust probiotic strains with enhanced functional properties and for targeted control of enteric pathogens

Mechanism of action

Probiotic bacteria

Pathogen

Functionality

References

Competitive exclusion

L. acidophilus; L. johnsonii

S. enterica serovar Typhimurium, Enteropathogenic E. coli (EPEC), Yersinia pseudotuberculosis, L. monocytogenes

Inhibited adherence of pathogens to Caco-2 cells

[33]

L. casei subsp. rhamnosus

EPEC, Enterotoxigenic E. coli (ETEC), Klebsiella pneumoniae

Inhibited adherence of pathogens to Caco-2 cells

[33]

L. rhamnosus; L. acidophilus

E. coli O157:H7

Inhibited adherence of pathogens to T-84 epithelial cell; inhibited colonization to Caco-2 cells

[33, 51]

L. acidophilus

H. pylori

Production of lacticins A164 and BH5

[37]

Production of inhibitory substances

L. lactis

E. coli, Salmonella

Production of alyteserin-1a and A3APO

[31]

B. longum

Clostridium difficile, E. coli

Production of bacteriocin

[35]

L. salivarius

L. monocytogenes

Production of bacteriocin Abp118

[35]

L. sake

L. monocytogenes

Production of bacteriocin sakacin A

[39]

L. plantarum

L. monocytogenes

Production of bacteriocins (plantaricins)

[40]

L. lactis

C. difficile

Production of lacticin 3147

[45]

L. lactis, L. casei, L. acidophilus

E. coli O157:H7

Reduced the growth of pathogen by lactic acid production and pH reductive effect

[33]

Immune system modulation

L. reuteri

Salmonella

Increased the production anti-Salmonella IgM

[35]

L. rhamnosus

E. coli O157:H7

Increased intestinal anti-E. coli IgA responses and blood leukocyte phagocytic activity

[33]

L. acidophilus, L. rhamnosus GG, L. johnsonii La1

S. Typhimurium

Increased the production of anti-Salmonella IgA

[42, 43]

Improved barrier function

L. plantarum, L. rhamnosus GG

E. coli O157:H7

Subvert the adherence of pathogen by increasing MUC2 and MUC3 in HT-29 epithelial cell line

[45, 47]

L. acidophilus

E. coli

Protected against F-actin rearrangement, which was induced in an epithelial cell line on exposure to a pathogenic E. coli

[45]

S. thermophilus; L. acidophilus

Enteroinvasive E. coli (EIEC)

Increased transepithelial resistance, maintenance and enhancement of cytoskeletal and tight junctional protein phosphorylation in HT29 and Caco-2 cell lines

[60]