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Mechanism by which histamine increases gastric mucosal blood flow in the rat

Role of luminal H+

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Abstract

The mechanism by which histamine increases gastric mucosal blood flow (GMBF) was investigated in the anesthetized rat. The experiment was performed in the presence of tripelennamine, an H1 antagonist, to focus on the relationship between acid secretion (H2-receptor-mediated response) and GMBF. The stomach was mounted on a Lucite chamber, perfused with saline, and GMBF was measured by laser Doppler flowmetry simultaneously with acid secretion. Under these conditions, histamine at the submaximal dose significantly increased GMBF as well as acid secretion, and this increase of GMBF was completely blocked when acid secretion was inhibited by cimetidine or omeprazole. The elevation of GMBF caused by histamine was also significantly attenuated when luminal H+ was removed by intraluminal perfusion with NaHCO3 or glycine. Glycine by itself did not affect the increase of acid secretion induced by histamine and the increase of GMBF caused by isoproterenol, yet significantly inhibited the GMBF response induced by pentagastrin. Intraluminal perfusion with HCl also produced an increase of GMBF in a concentration-related manner, even in the presence of omeprazole during histamine infusion. Pretreatment of the animals with indomethacin significantly blocked the GMBF responses induced by either histamine or luminal HCl. These results suggest that the increase of GMBF during acid secretion induced by histamine may be caused by luminal H+ and involve endogenous prostaglandins in its mechanism.

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Authors and Affiliations

  1. Department of Applied Pharmacology, Kyoto Pharmaceutical University, Misasagi, 607, Yamashina, Kyoto, Japan

    Shinichi Kato MA, Koji Takeuchi PhD & Susumu Okabe PhD

Authors
  1. Shinichi Kato MA
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  2. Koji Takeuchi PhD
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  3. Susumu Okabe PhD
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Kato, S., Takeuchi, K. & Okabe, S. Mechanism by which histamine increases gastric mucosal blood flow in the rat. Digest Dis Sci 38, 1224–1232 (1993). https://doi.org/10.1007/BF01296071

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  • DOI: https://doi.org/10.1007/BF01296071

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