OBJECTIVES: We tested whether the interaction between host gastric Le(x) antigen and the SabA protein of H. pylori determined gastric colonization density. METHODS: A total of 145 H. pylori-infected patients were assessed for their bacterial density and gastric Le(b) and sialyl-Le(x) expression. Their corresponding H. pylori isolates were tested for babA2 and sabA genotype by PCR. The sabA-genopositive PCR products were sequenced to check for mutations affecting SabA expression. The BabA and SabA expressions of each isolate were confirmed by Western blotting. RESULTS: All 145 H. pylori isolates were babA2-genopositive and expressed BabA. There were 116 (80%) sabA-genopositive isolates, but only 45 (31%) of the isolates expressed SabA. Sequence of sabA-genopositive PCR products was achieved in 92 isolates, of which 60% had regular CT repeat-pairs and the other 40% had a unique deletion of the CT repeats. Neither the deletion nor the different CT repeat-pairs in the sabA region were totally correlated with SabA expression, defined by Western blotting. H. pylori density was higher in those expressing gastric sialyl-Le(x) antigen (which interacts with SabA) (p < 0.001) only in those patients expressing weak or no gastric Le(b) antigen (which would interact with BabA), not in those with evident expression of gastric Le(b) antigen. CONCLUSIONS: In Taiwan, H. pylori isolates are 100% BabA-positive, but only 31% of them express SabA. The interaction between gastric sialyl-Le(x) and SabA of H. pylori determines the colonization density of patients expressing gastric Le(b) weakly or not at all.
OBJECTIVES: We tested whether the interaction between host gastric Le(x) antigen and the SabA protein of H. pylori determined gastric colonization density. METHODS: A total of 145 H. pylori-infectedpatients were assessed for their bacterial density and gastric Le(b) and sialyl-Le(x) expression. Their corresponding H. pylori isolates were tested for babA2 and sabA genotype by PCR. The sabA-genopositive PCR products were sequenced to check for mutations affecting SabA expression. The BabA and SabA expressions of each isolate were confirmed by Western blotting. RESULTS: All 145 H. pylori isolates were babA2-genopositive and expressed BabA. There were 116 (80%) sabA-genopositive isolates, but only 45 (31%) of the isolates expressed SabA. Sequence of sabA-genopositive PCR products was achieved in 92 isolates, of which 60% had regular CT repeat-pairs and the other 40% had a unique deletion of the CT repeats. Neither the deletion nor the different CT repeat-pairs in the sabA region were totally correlated with SabA expression, defined by Western blotting. H. pylori density was higher in those expressing gastric sialyl-Le(x) antigen (which interacts with SabA) (p < 0.001) only in those patients expressing weak or no gastric Le(b) antigen (which would interact with BabA), not in those with evident expression of gastric Le(b) antigen. CONCLUSIONS: In Taiwan, H. pylori isolates are 100% BabA-positive, but only 31% of them express SabA. The interaction between gastric sialyl-Le(x) and SabA of H. pylori determines the colonization density of patients expressing gastric Le(b) weakly or not at all.
Authors: Olga A Senkovich; Jun Yin; Viktoriya Ekshyyan; Carolyn Conant; James Traylor; Patrick Adegboyega; David J McGee; Robert E Rhoads; Sergey Slepenkov; Traci L Testerman Journal: Infect Immun Date: 2011-05-16 Impact factor: 3.441
Authors: A Chiarini; C Calà; C Bonura; A Gullo; G Giuliana; S Peralta; F D'Arpa; A Giammanco Journal: Eur J Clin Microbiol Infect Dis Date: 2008-10-29 Impact factor: 3.267
Authors: Andrew C Goodwin; Daniel M Weinberger; Christopher B Ford; Jessica C Nelson; Jonathan D Snider; Joshua D Hall; Catharine I Paules; Richard M Peek; Mark H Forsyth Journal: Microbiology Date: 2008-08 Impact factor: 2.777