Modification of gastric mucin oligosaccharide expression in rhesus macaques after infection with Helicobacter pylori.
OBJECTIVE
Helicobacter pylori attaches to mucin oligosaccharides that are expressed on host gastric epithelium. We used the rhesus macaque model to characterize the effect of H. pylori infection on gastric mucin oligosaccharides during acute and chronic infection.


METHODS
Specific pathogen (H. pylori)-free rhesus macaques were inoculated with H. pylori J166. Biopsy specimens of the gastric antrum were obtained 2 and 4 weeks before and 2, 8, and 24 weeks after infection with H. pylori. O-linked mucin oligosaccharides were released from gastric biopsy samples by beta-elimination and profiled by matrix-assisted laser desorption/ionization mass spectrometry. Similar studies were performed on gastric biopsy samples from H. pylori-infected and uninfected humans. Formalin-fixed, paraffin-embedded sections of rhesus antrum biopsy samples were stained with H&E, periodic acid-Schiff stain, and antibody to MUC5AC, the predominant mucin expressed in the stomach.


RESULTS
H. pylori-induced gastritis was accompanied by an acute and dramatic decrease in diversity and relative abundance of O-linked mucin oligosaccharides in the rhesus stomach, which largely recovered during the 24-week observation period. These variations in oligosaccharide abundance detected by mass spectrometry were reflected by changes in periodic acid-Schiff-positive material and expression of MUC5AC over time. Relatively few differences were seen in gastric mucin oligosaccharide composition between H. pylori-infected and uninfected patients, which is consistent with the results in rhesus macaques because infection occurs in childhood.


CONCLUSIONS
Acute H. pylori infection is accompanied by a dramatic but transient loss in mucin oligosaccharides that may promote colonization and persistence.
Department of Internal Medicine, University of California, Davis, California, USA.
Cara L
CL
Cooke
Hyun Joo
HJ
An
Jaehan
J
Kim
Don R
DR
Canfield
Javier
J
Torres
Carlito B
CB
Lebrilla
Jay V
JV
Solnick
D000818:Animals; D005752:Gastric Mucins / Q000378:metabolism*; D005756:Gastritis / Q000378:metabolism / Q000382:microbiology / Q000473:pathology; D016481:Helicobacter Infections / Q000378:metabolism* / Q000382:microbiology / Q000473:pathology; D016480:Helicobacter pylori / Q000302:isolation & purification; D008253:Macaca mulatta; D008297:Male; D055271:Mucin 5AC / Q000378:metabolism; D009844:Oligosaccharides / Q000378:metabolism*; D011706:Pyloric Antrum / Q000382:microbiology / Q000473:pathology; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
D005752:Gastric Mucins; D055271:Mucin 5AC; D009844:Oligosaccharides