A proinflammatory, antiapoptotic phenotype underlies the susceptibility to acute pancreatitis in cystic fibrosis transmembrane regulator (-/-) mice.

Abstract:

BACKGROUND & AIMS:Cystic fibrosis transmembrane regulator (CFTR) gene mutations are associated with pancreatic insufficiency and pancreatitis. Chronic pancreatitis, including cystic fibrosis-related disease, may exist as a continuum between acute and chronic disease and may manifest as recurrent pain. We hypothesized that cftr(m1UNC) (-/-) mice, which have no evidence of chronic pancreatitis, are susceptible to developing acute pancreatitis. METHODS:We used a cerulein hyperstimulation model of acute pancreatitis and measured histological changes, tissue edema, neutrophil infiltration, inflammatory mediators' mRNA expression, apoptosis markers, and pancreatic trypsin and serum lipase activities. Additionally, we quantitated in vivo pancreatic secretion and pancreatic digestive enzymes. RESULTS:Multiple proinflammatory cytokine genes were constitutively overexpressed in cftr (-/-) pancreas compared with wild-type mice. During acute pancreatitis, cftr (-/-) mice developed more severe acute pancreatitis than wild-type, as indicated by greater pancreatic edema, neutrophil infiltration, mRNA expression of multiple inflammatory mediators, and less apoptotic cell death. In contrast to wild-type mice, cftr (-/-) mice had blunted increases in pancreatic trypsin and serum lipase activities, but similar percentages of pancreatic trypsinogen activation. Finally, cftr (-/-) mice had less in vivo pancreatic secretion in response to cholecystokinin octapeptide and reduced pancreatic digestive enzyme protein and mRNA levels, thus suggesting mild pancreatic insufficiency. CONCLUSIONS:A baseline proinflammatory state and an antiapoptotic phenotype may sensitize cftr (-/-) mice to developing more severe acute pancreatitis with an exuberant pancreatic inflammatory response. Cftr (-/-) mice have mild pancreatic insufficiency, which partially explains the blunted increase of pancreatic and serum digestive enzymes during acute pancreatitis. These findings may explain the susceptibility to acute pancreatitis in persons with classic and nonclassic cystic fibrosis.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Dimagno MJ,Lee SH,Hao Y,Zhou SY,McKenna BJ,Owyang C

doi

10.1016/j.gastro.2005.05.059

keywords:

subject

Has Abstract

pub_date

2005-08-01 00:00:00

pages

665-81

issue

2

eissn

0016-5085

issn

1528-0012

pii

S0016-5085(05)01084-X

journal_volume

129

pub_type

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