High concentrations of human β-defensin 2 in gastric juice of patients with Helicobacter pyloriinfection

• Published in: World journal of gastroenterology : WJG Vol. 11; no. 31; pp. 4782 - 4787
• Main Author: Hajime Isomoto Hiroshi Mukae Hiroshi Ishimoto Yoshito Nishi Chun-Yang Wen Akihiro Wad Ken Ohnita Toshiya Hirayama Masamitsu Nakazato Shigeru Kohno
• Format: Journal Article
• Language: English
• Published: 2005
• Subjects: β-防御素2; 幽门螺杆菌; 细菌感染; 胃疾病
• ISSN: 1007-9327; 2219-2840

MIA： Human β-defensin （HBD）-1 and HBD-2 are endogenous antimicrobial peptides. Unlike HBD-1, the HBD-2 expression is augmented by Helicobacter pylori （H pylon）. We sought to determine HBD-1 and HBD-2 concentrations in gastric juice during Hpylori infection. METHODS： HBD-1 and HBD-2 concentrations were measured by radioimmunoassay in plasma and gastric juice of 49 Hpylori-infected and 33 uninfected subjects and before and after anti-H pyloritreatment in,13 patients with Hpylori-associated gastritis. Interleukin （IL）-1β and IL-8 concentrations in gastric juice were measured by enzyme-linked immunosorbent assay （ELISA）. Histological grades of gastritis were determined using two biopsy specimens taken from the antrum and corpus. Reverse phase high performance liquid chromatography （RP-HPLC） was used to identify HBD-2. RESULTS： HBD-2 concentrations in gastric juice, but not in plasma, were significantly higher in Hpylori-positive than -negative subjects, albeit the post-treatment levels were unchanged. Immunoreactivity for HBD-2 was exclusively identified in Hpylori-infected mucosa by RPHPLC. HBD-2 concentrations in gastric juice correlated with histological degree of neutrophil and mononuclear cell infiltration in the corpus. IL-1β levels correlated with those of IL-8, but not HBD-2. Plasma and gastric juice HBD-1 concentrations were similar in H pylori-infected and uninfected subjects. CONCLUSION： Our results place the β-defensins, especiallyHBD-2, in the front line of innate immune defence. Moreover, HBD-2 may be involved in the pathogenesis of Hpylori-associated gastritis, possibly through its function as immune and inflammatory mediator.