Digestive Diseases and Sciences

, Volume 39, Issue 1, pp 169–176 | Cite as

Effect of proton pump inhibitor, omeprazole, on expression of rat parietal cell specific carbohydrate antigen, type 2 chainN-acetyllactosamine

  • Ryoji Usumoto
  • Yoshio Okada
  • Takao Tsuji
Original Article


The effect of a proton pump inhibitor, omeprazole, on the rat gastric mucosal expression of carbohydrate antigens was studied. Type 2 chainN-acetyllactosamine was detected specifically on the apicocanalicular cell membranes of parietal cells. Pretreatment of rats with omeprazole profoundly suppressed the antigen expression, which followed the inhibition of gastric acid secretion. When omeprazole was discontinued, the antigen was reexpressed, which preceded the restoration of acid secretion. The antigen-negative tissues became antigen-positive when they were desialylated. Gastric membrane vesicles from the normal and omeprazole-treated rats were antigen-positive and-negative, respectively. SDS-PAGE revealed that a glycoprotein with an apparent molecular weight of 64–78 kDa carried type 2 chainN-acetyllactosamine. In the omeprazole-treated rats, the same molecular weight glycoprotein was positively immunostained only after desialylation. We concluded that: (1) the expression of type 2 chainN-acetyllactosamine was closely correlated with gastric acid secretion, and (2) the inhibition of acid secretion was accompanied by the sialylation of the parietal cell membrane glycoprotein.

Key words

rat parietal cell carbohydrate antigen proton pump inhibitor 


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Copyright information

© Plenum Publishing Corporation 1994

Authors and Affiliations

  • Ryoji Usumoto
    • 1
    • 2
  • Yoshio Okada
    • 1
    • 2
  • Takao Tsuji
    • 1
    • 2
  1. 1.From the First Department of Internal MedicineOkayama University Medical SchoolJapan
  2. 2.Department of Food and NutritionOkayama Prefectural Junior CollegeOkayamaJapan

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