Affiliation:
1. Laboratory of Medical Microbiology, Institut Pasteur Hellenique, Athens, Greece
2. Gastroenterology Clinic, Alexandra Hospital, Athens, Greece
Abstract
ABSTRACT
In clinical settings,
Lactobacillus johnsonii
La1 administration has been reported to have a favorable effect on
Helicobacter pylori
-associated gastritis, although the mechanism remains unclear. We administered, continuously through the water supply, live La1 to
H. pylori
-infected C57BL/6 mice and followed colonization, the development of
H. pylori
-associated gastritis in the lamina propria, and the levels of proinflammatory chemokines
m
acrophage
i
nflammatory
p
rotein 2 (MIP-2) and
k
eratinocyte-derived
c
ytokine (KC) in the serum and gastric tissue over a period of 3 months. We documented a significant attenuation in both lymphocytic (
P
= 0.038) and neutrophilic (
P
= 0.003) inflammatory infiltration in the lamina propria as well as in the circulating levels of anti-
H. pylori
immunoglobulin G antibodies (
P
= 0.003), although we did not observe a suppressive effect of La1 on
H. pylori
colonizing numbers. Other lactobacilli, such as
L. amylovorus
DCE 471 and
L. acidophilus
IBB 801, did not attenuate
H. pylori
-associated gastritis to the same extent. MIP-2 serum levels were distinctly reduced during the early stages of
H. pylori
infection in the La1-treated animals, as were gastric mucosal levels of MIP-2 and KC. Finally, we also observed a significant reduction (
P
= 0.046) in
H. pylori-
induced interleukin-8 secretion by human adenocarcinoma AGS cells in vitro in the presence of neutralized (pH 6.8) La1 spent culture supernatants, without concomitant loss of
H. pylori
viability. These observations suggest that during the early infection stages, administration of La1 can attenuate
H. pylori
-induced gastritis in vivo, possibly by reducing proinflammatory chemotactic signals responsible for the recruitment of lymphocytes and neutrophils in the lamina propria.
Publisher
American Society for Microbiology
Subject
Microbiology (medical),Clinical Biochemistry,Immunology,Immunology and Allergy
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