title: Caerulin-induced pancreatitis in rats: histological and genetic expression changes from acute phase to recuperation.
abstract: OBJECTIVE
  To study the histological and pancreatitis-associated protein mRNA accumulation changes of pancreas from acute phase of caerulin-induced pancreatitis to recuperation in rats.
  
  
  METHODS
  Acute pancreatitis was induced by caerulein in male Wistar rats and followed up for 90 d by histological and mRNA analyses of pancreas. Pancreases were dissected at 0, 9, 24 h and 3, 5, 15, 30, 60, 90 d post-induction. Edema (E), polymorphonuclear neutrophil (PMN) infiltration, cytoplasmic vacuolization (V), zymogen granule depletion (ZD) and acinar disorganization (AD) were microscopically evaluated. Accumulation of pancreatitis-associated protein (PAP) and L13A mRNAs were quantified by real-time PCR.
  
  
  RESULTS
  The main histological changes appeared at 9 h post-induction for PMN infiltration and cytoplasmic V, while at 24 h and 3 d for E and ZD, respectively. All the parameters were recovered after 5 d, except for ZD which delayed more than 30 d. The main AD was observed after 15 d and values returned to normal after 30 d. Similarly to histological changes, accumulation of the PAP mRNA was increased at 9 h with the highest accumulation at 24 h and differences disappeared after 5 d.
  
  
  CONCLUSIONS
  From the acute phase to recuperation of pancreatitis, regeneration and re-differentiation of pancreas occur and PAP expression is exclusively an acute response of pancreatitis.
authors.affiliation: Departamento de Nutrición, Centro de Investigación en Alimentación y Desarrollo, A.C. PO BOX 1735, Hermosillo 83000, Sonora, México.
authors.forename: Javier
authors.initials: J
authors.lastname: Magaña-Gómez
authors.forename: Guillermo
authors.initials: G
authors.lastname: López-Cervantes
authors.forename: Ana María
authors.initials: AM
authors.lastname: Calderón de la Barca
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002108:Ceruletide; D015870:Gene Expression; D037181:Lectins, C-Type / Q000378:metabolism*; D008297:Male; D010179:Pancreas / Q000378:metabolism* / Q000473:pathology*; D010195:Pancreatitis / Q000139:chemically induced / Q000378:metabolism* / Q000473:pathology*; D000073718:Pancreatitis-Associated Proteins; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000378:metabolism; D051381:Rats; D017208:Rats, Wistar; D020127:Recovery of Function / Q000502:physiology*
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D037181:Lectins, C-Type; D000073718:Pancreatitis-Associated Proteins; C000612141:REG3A protein, human; D012333:RNA, Messenger; C000612144:Reg3b protein, rat; D002108:Ceruletide