title: Arginine induced acute pancreatitis alters the actin cytoskeleton and increases heat shock protein expression in rat pancreatic acinar cells.
abstract: Arginine induced acute pancreatitis was evaluated as a novel and distinct form of experimental pancreatitis with particular attention to the actin cytoskeleton and expression of heat shock or stress proteins. Arginine induced a dose related necrotising pancreatitis in rats, as shown by histological evaluation, and an increase in serum amylase. Severe pancreatitis induced by 4.5 g/kg arginine was accompanied by dramatic changes in the actin cytoskeleton, as visualised with rhodamine phallodin. Intermediate filaments were also disrupted, as visualised by cytokeratin 8/18 immunocytochemistry. Arginine pancreatitis was accompanied by a stress response with a large increase in the small heat shock protein HSP27, as well as HSP70, peaking at 24 hours and localised to acinar cells. There was a lower increase in HSP60 and HSP90 and no effect on GRP78. HSP27 was also shifted to phosphorylated forms during pancreatitis. A lower dose of arginine (3.0 g/kg) induced less pancreatitis but a larger increase in HSP70 and HSP27 expression and phosphorylation of HSP27. Thus HSP expression can be overwhelmed by severe damage. The present work in conjunction with earlier work on caerulein induced pancreatitis indicates that changes in the actin cytoskeleton are an early component in experimental pancreatitis.
authors.affiliation: Department of Physiology, University of Michigan Medical School, Ann Arbor, Michigan 48109-0622, USA.
authors.forename: M
authors.initials: M
authors.lastname: Tashiro
authors.forename: C
authors.initials: C
authors.lastname: Schäfer
authors.forename: H
authors.initials: H
authors.lastname: Yao
authors.forename: S A
authors.initials: SA
authors.lastname: Ernst
authors.forename: J A
authors.initials: JA
authors.lastname: Williams
mesh_terms: D008841:Actin Cytoskeleton / Q000378:metabolism / Q000473:pathology*; D000199:Actins / Q000378:metabolism; D000681:Amylases / Q000097:blood; D000818:Animals; D001120:Arginine; D015153:Blotting, Western; D018834:Chaperonin 60 / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D055551:HSP27 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins / Q000378:metabolism; D018841:HSP90 Heat-Shock Proteins / Q000378:metabolism; D006360:Heat-Shock Proteins / Q000378:metabolism*; D007633:Keratins / Q000378:metabolism; D008297:Male; D009363:Neoplasm Proteins / Q000378:metabolism; D019283:Pancreatitis, Acute Necrotizing / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology*; D010590:Phalloidine / Q000378:metabolism; D010766:Phosphorylation; D051381:Rats; D017207:Rats, Sprague-Dawley; D012235:Rhodamines / Q000378:metabolism
chemical_list: D000199:Actins; D018834:Chaperonin 60; D055551:HSP27 Heat-Shock Proteins; D018840:HSP70 Heat-Shock Proteins; D018841:HSP90 Heat-Shock Proteins; D006360:Heat-Shock Proteins; C486114:Hspb1 protein, rat; D009363:Neoplasm Proteins; D012235:Rhodamines; D010590:Phalloidine; D007633:Keratins; D001120:Arginine; D000681:Amylases