Comparison of mucosal B- and T-cell responses in Helicobacter pylori-infected subjects in a developing and a developed country.

• Helicobacter pylori is highly endemic in developing countries, but comparatively little is known about mucosal immune responses to H. pylori in these settings. Therefore, we have compared B- and T-cell responses, with a focus on the gastrointestinal mucosa, in H. pylori-infected adults in a developing (Bangladesh) and a developed (Sweden) country. We found comparable numbers of CD19(+) B cells and CD4 (+)T cells and similar levels of H. pylori-specific IgA antibodies in gastric mucosa from Bangladeshi and Swedish volunteers. However, about threefold higher numbers of CD19(+) B cells and 12-fold increased levels of H. pylori-specific IgA antibodies were found in the duodenum of Bangladeshi subjects. The gastric and duodenal immune responses in Bangladeshi asymptomatic carriers and duodenal ulcer patients were comparable. Bangladeshi subjects had about twofold lower titers of H. pylori-specific IgA and IgG antibodies in the circulation compared with Swedish volunteers. In conclusion, our findings suggest that Bangladeshi individuals have comparable gastric immune responses, but lower systemic antibody responses to H. pylori, compared with Swedish volunteers. Increased inflammation is present in the duodenum of Bangladeshi volunteers, maybe as a result of frequent exposure to enteric infections in these individuals.

Ämnesord

MEDICIN OCH HÄLSOVETENSKAP  -- Medicinska och farmaceutiska grundvetenskaper -- Mikrobiologi inom det medicinska området (hsv//swe)

MEDICAL AND HEALTH SCIENCES  -- Basic Medicine -- Microbiology in the medical area (hsv//eng)

Nyckelord

Adolescent

Adult

Animals

Antibodies

Bacterial

analysis

immunology

B-Lymphocytes

immunology

Bangladesh

epidemiology

Developed Countries

Developing Countries

Duodenum

immunology

Female

Helicobacter Infections

epidemiology

immunology

microbiology

Helicobacter pylori

immunology

Humans

Immunity

Mucosal

Intestinal Mucosa

immunology

Male

Middle Aged

Pyloric Antrum

immunology

Sweden

epidemiology

T-Lymphocytes

immunology

Publikations- och innehållstyp

ref (ämneskategori)

art (ämneskategori)