Clinical relevance of Helicobacter pylori sabA genotype in Japanese clinical isolates.
OBJECTIVE
The clinical outcome of Helicobacter pylori infection is strongly affected by the bacterial genotype. The aim of this study was to assess the relationship between the status of H. pylori sialic acid-binding adhesin (sabA) and the severity of gastric inflammation and diseases.


METHODS
Clinical isolates from 108 patients with duodenal ulcer, gastric ulcer, gastric cancer, or chronic gastritis were analyzed by sequencing and PCR assay. The degree of neutrophil infiltration in the antral region was evaluated by histopathological examination. The extent of atrophic change was evaluated using serum pepsinogen levels and the pepsinogen I/II ratio.


RESULTS
Functional sabA was present in 88 (81%) of the 108 patients. Although there was no correlation between the sabA status and gastric diseases, severe neutrophil infiltration and atrophy were associated with functional sabA.


CONCLUSIONS
The results show a high prevalence of functional sabA in Japanese clinical isolates. The status of sabA may be an important virulence factor in inducing chronic gastric inflammation.
Yanai
Ayako
A
Division of Gastroenterology, The Institute for Adult Diseases, Asahi Life Foundation, Chiyoda-ku, Tokyo, Japan. ayanai-gi@umin.ac.jp
Maeda
Shin
S
Hikiba
Yoko
Y
Shibata
Wataru
W
Ohmae
Tomoya
T
Hirata
Yoshihiro
Y
Ogura
Keiji
K
Yoshida
Haruhiko
H
Omata
Masao
M
D018829:Adhesins, Bacterial / Q000737:chemistry / Q000235:genetics*; D000595:Amino Acid Sequence; D044466:Asian People; D001284:Atrophy; D001483:Base Sequence; D005260:Female; D005753:Gastric Mucosa / Q000473:pathology; D005838:Genotype; D016481:Helicobacter Infections / Q000453:epidemiology; D016480:Helicobacter pylori / Q000302:isolation & purification* / Q000472:pathogenicity; D006801:Humans; D007249:Inflammation / Q000382:microbiology; D007564:Japan / Q000453:epidemiology; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D010435:Pepsinogens / Q000097:blood; D015995:Prevalence; D037521:Virulence Factors
D018829:Adhesins, Bacterial; D010435:Pepsinogens; C500808:SabA protein, Helicobacter pylori; D037521:Virulence Factors