Nitric oxide is overproduced by peritoneal macrophages in rat taurocholate pancreatitis: The mechanism of inducible nitric oxide synthase expression

Akihiko Satoh, Tooru Shimosegawa, Kenji Kimura, Shigeki Moriizumi, Atsushi Masamune, Masaru Koizumi, Takayoshi Toyota

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

To investigate the pathobiology of severe acute pancreatitis, we studied the expression of inducible nitric oxide synthase (iNOS) in peritoneal macrophages of experimental pancreatitis. Taurocholate (TCA) pancreatitis and cerulein (CE) pancreatitis were used as models of lethal and self-limited pancreatitis, respectively, and the mechanism of iNOS expression in peritoneal macrophages was studied. Serum nitrate and nitrite (NOx) concentrations increased during the course of TCA pancreatitis, and iNOS- immunoreactivity was detected in the peritoneal macrophages 12 h after the induction of TCA pancreatitis, but these phenomena were not observed in CE pancreatitis. Despite the difference in the iNOS expression, the iNOS messenger RNA (mRNA) and the activation of nuclear factor-κB (NF-κB) were detected in the peritoneal macrophages of both pancreatitis models. The supernatant of TCA pancreatitis ascites could induce iNOS in the peritoneal macrophages of normal rats in vitro, but the peritoneal lavage fluid of CE pancreatitis rats could not. The results indicated that there may be qualitative or quantitative differences in the macrophage activation between the two types of experimental pancreatitis and suggested that the ascites of rats with lethal acute pancreatitis contains some soluble factors that activate the macrophage/monocyte system and cause an overproduction of NO by the iNOS expression.

Original languageEnglish
Pages (from-to)402-411
Number of pages10
JournalPancreas
Volume17
Issue number4
DOIs
Publication statusPublished - 1998 Nov

Keywords

  • Acute pancreatitis
  • Inducible nitric oxide synthase
  • Nuclear factor- κB
  • Peritoneal macrophage
  • Rat

ASJC Scopus subject areas

  • Internal Medicine
  • Endocrinology, Diabetes and Metabolism
  • Hepatology
  • Endocrinology

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