The gp200-MR6 molecule which is functionally associated with the IL-4 receptor modulates B cell phenotype and is a novel member of the human macrophage mannose receptor family

Expression of DEC205 in the gastric mucosa of Helicobacter pylori-infected patients

AIM: To investigate the expression of DEC205 in the gastric mucosa of Helicobacter pylori (H. pylori)-infected patients.

METHODS: Thirteen H. pylori-positive patients with gastritis received eradication therapy. Gastroscopy was performed in all the 13 patients before eradication therapy and in 7 seven patients after treatment to take gastric mucosa samples, which were used to prepare frozen section to detect the expression of DEC205 and CD14 in human gastric mucosa by immunofluorescence.

RESULTS: Cells which were positive for both DEC205 and CD14 in the gastric mucosa significantly increased in H. pylori-infected patients. Furthermore, DEC205-positive macrophages invaded into gastric pits in the gastric mucosa of H. pylori-positive patients.

CONCLUSION: Macrophage expressing DEC205 in the gastric mucosa may play an immunological role in H. pylori infection.

Expression of DEC205 in Helicobacter pylori-infected macrophages

AIM: To investigate the relationship between Helicobacter pylori (H. pylori) infection and the expression of DEC205.

METHODS: H. pylori-HSP60 was prepared by a recombinant DNA procedure. After monocytic cells (NOMO1 line) were infected with H. pylori or stimulated with H. pylori-HSP60 or E.coli-LPS, whole cell protein was extracted and analyzed by Western blot. NOMO1 cells were then treated with PMA to induce their differentiation into macrophages, and infected with H. pylori or stimulated with H. pylori-HSP60. The expression of DEC205 mRNA was detected by real-time PCR. The expression of DEC205 protein on the surface of NOMO1 cells was analyzed by flow cytometry.

RESULTS: The expression of DEC205 protein was markedly increased following H. pylori infection, whereas the protein expression was only slightly upregulated after stimulation with H. pylori-HSP60 or E.coli-LPS. After treatment of NOMO1 cells with PMA, the expression of DEC205 mRNA was enhanced. Subsequent infection with H. pylori or stimulation with H. pylori-HSP60 could induce the expression of DEC205 mRNA in differentiated NOMO1 cells. Flow cytometry analysis indicated that the expression of DEC205 protein was upregulated obviously on the surface of H. pylori-infected NOMO1 cells (88.10% vs 7.84%, P < 0.05). Moreover, H. pylori infection and H. pylori-HSP60 stimulation could also increase DEC205 expression in differentiated NOMO1 cells (74.73% and 51.31% vs 43.77%, both P < 0.05).

CONCLUSION: H. pylori infection may be closely related with the expression of DEC205 on the surface of macrophages in gastric mucosa.