Gastric prostacyclin (PGI2) prevents stress-induced gastric mucosal injury in rats primarily by inhibiting leukocyte activation.

Published

Journal Article

We investigated whether, in rats, gastric prostacyclin (PGI2) prevented gastric mucosal injury that was induced by water-immersion restraint stress by inhibiting leukocyte activation. Gastric levels of 6-keto-PGF1alpha, a stable metabolite of PGI2, increased transiently 30 min after stress, followed by a decrease to below the baseline 6-8 h after stress. Gastric mucosal blood flow decreased to approximately 40% of the baseline level 8 h after stress. Myeloperoxidase activity was significantly increased 8 h after stress. Treatment with indomethacin before stress inhibited the increase in 6-keto-PGF1alpha levels and markedly reduced mucosal blood flow. It also markedly increased leukocyte accumulation and mucosal lesion formation. Iloprost, a stable PGI2 analog, inhibited the indomethacin-induced decrease in mucosal blood flow, mucosal lesion exacerbation, and increase in leukocyte accumulation. Nitrogen mustard-induced leukocytopenia inhibited the indomethacin-associated lesion exacerbation and the increase in leukocyte accumulation, but not the decreases in mucosal blood flow. These observations indicate that gastric PGI2 decreases gastric mucosal lesion formation primarily by inhibiting leukocyte accumulation.

Full Text

Cited Authors

  • Harada, N; Okajima, K; Murakami, K; Isobe, H; Liu, W

Published Date

  • July 1999

Published In

Volume / Issue

  • 57 / 5-6

Start / End Page

  • 291 - 303

PubMed ID

  • 10480484

Pubmed Central ID

  • 10480484

International Standard Serial Number (ISSN)

  • 1098-8823

Digital Object Identifier (DOI)

  • 10.1016/s0090-6980(98)00077-x

Language

  • eng