ArticleDigestive diseases and sciences1998
Intracellular calcium affects neutrophil chemoattractant expression by macrophages in rats with cerulein-induced pancreatitis.
Article in Digestive diseases and sciences, 1998. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Pancreatitis complicated with infection often results in the development of multiple organ failure. We investigated the role of altered intracellular calcium as a priming signal for cytokine-induced neutrophil chemoattractant expression in this process. Agents modulating cytosolic Ca2+ were utilized to study the in vivo and in vitro cytokine-induced neutrophil chemoattractant expression for macrophages in rats with cerulein-induced pancreatitis after intraperitoneal administration of lipopolysaccharide as a septic challenge. Pretreatment with the calcium channel blocker verapamil significantly reduced serum cytokine-induced neutrophil chemoattractant concentrations in rats with cerulein-induced pancreatitis after septic challenge. Lipopolysaccharide-stimulated in vitro cytokine-induced neutrophil chemoattractant (CINC) production by peritoneal macrophages was significantly enhanced by pretreatment with thapsigargin (an inhibitor of the endoplasmic reticulum-resident Ca2+-ATPase), but not by A23187 (a calcium-specific ionophore, extracellular Ca2+ influx). Pretreatment with U73122 (a phospholipase C inhibitor) inhibited lipopolysaccharide-stimulated but not basal cytokine-induced neutrophil chemoattractant production, while verapamil (a calcium channel blocker), TMB-8 (an inhibitor of calcium release from endoplasmic reticulum), and W7 (calmodulin antagonist) completely abrogated the chemoattractant production. Altered intracellular calcium, due to Ca2+ efflux from intracellular stores, may be involved in the "priming" of macrophages to release cytokine-induced neutrophil chemoattractant following triggering with lipopolysaccharide during acute cerulein pancreatitis.
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