Probiotics in Controlling Gastric Colonization by H pylori?

Anti-inflammatory Properties of Probiotic Strains

As described previously, L. acidophilus LB and L. johnsonii La1 decrease gastric inflammation in colonized animals.[30,32] This was also observed with other probiotic strains: L. salivarius WB1004 (108 CFU/mL) was able to displace H. pylori adhering to the MKN45 cell line and to exert an anti-inflammatory effect by decreasing dose dependently the release by these cells of IL-8.[33] Therefore, this same probiotic strain was used to evaluate its preventive effect in gnotobiotic BALB/c mice mono-colonized by H. pylori. Administration of L. salivarius prevented H. pylori colonization and the development of gastritis; this effect was specific of this probiotic as it was not observed with other micro-organisms such as E. faecalis and S. aureus. Administration of L. salivarius after infection eradicated H. pylori and reversed gastric inflammation. Similar observations were reported with L. rhamnosus R0011 and L. acidophilus R0052[34] and with L. gasseri OLL2716.[35] Furthermore, the intake of yogurt containing this latter strain protected rats in a dose-dependent manner against acute gastric lesions induced by oral administration of HCl, compared with the administration of non-fermented milk.[36] The size of the gastric lesions was decreased by yogurt and this was associated with significantly increased levels of PGE2 in the gastric mucosa. Such protective activity was inhibited when indomethacin was injected, confirming the importance of prostaglandins in this effect.

Increased levels of 6-ketoprostaglandin F1-α, EGF and bFGF have also been implicated in the protective effect displayed by strains of B. breve and B. bifidum against gastric ulceration induced by acetic acid or ethanol in rats.[37] Interestingly, the oral administration of the polysaccharide fractions of these micro-organisms exerted a similar anti-ulcer effect. The intensity of this activity correlated with the rhamnose content of the polysaccharides, those with more than 60% of rhamnose being the most effective in inducing healing of the gastric mucosa.  Printer- Friendly Email This

Aliment Pharmacol Ther.  2006;23(8):1077-1086.  ©2006 Blackwell Publishing
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