Peptide Leukotriene Receptor Antagonist Diminishes Pancreatic Edema Formation in Rats with Cerulein-Induced Acute Pancreatitis

Abstract

Background: This study was designed to evaluate the protective effect of a peptide leukotriene receptor antagonist, pranlukast hydrate, against pancreatic injuries during acute pancreatitis. Methods: Acute pancreatitis was induced in rats by intravenous infusion of a supramaximal dose of cerulein (5 μg/kg·h for 4 h). In this model marked hyperamylasemia, a significant increase in pancreatic water content, and a significant increase in pancreatic microvascular leakage of Evans blue dye were observed. Pancreatic subcellular redistribution of the lysosomal enzyme cathepsin B from the lysosomal fraction to the zymogen fraction was also observed. Results: Pretreatment with pranlukast hydrate at a dose of 10 mg/kg (twice, 8 and 4 h before cerulein infusion) significantly inhibited these pancreatic injuries, including hyperamylasemia, increased pancreatic microvascular permeability, and redistribution of cathepsin B in pancreatic acinar cells. Conclusions: These results suggest that peptide leukotrienes may be involved in the pathogenesis of acute pancreatitis in the early stage of the disease and that peptide leukotriene receptor antagonist might be of therapeutic value for treatment of acute pancreatitis.

Key Words:

• Cathepsin B
• cerulein-induced acute pancreatitis
• Evans blue dye
• microvascular leakage
• peptide leukotriene