Tumor protein p53-induced nuclear protein 1 (TP53INP1) in spontaneous chronic pancreatitis in the WBN/Kob rat: drug effects on its expression in the pancreas.
BACKGROUND
The tumor protein p53-induced nuclear protein 1 (TP53INP1) gene was found using DNA microarray technology as an overexpressed gene in acute pancreatitis. However, expression of TP53INP1 in chronic pancreatitis has not been previously reported.


OBJECTIVE
This study investigated TP53INP1 gene expression and its relationship with p53 and apoptosis in spontaneous chronic pancreatitis in the Wistar-Bonn/Kobori rat.


METHODS
Ninety four-week-old male Wistar-Bonn/Kobori rats were fed a special breeding diet until sacrifice. Camostat mesilate (n=30) or a herbal medicine (Saiko-keishi-to; n=30) were mixed with the diet, while the other 30 rats were untreated. The rats were sacrificed every 4 weeks for 20 weeks, and the pancreas was examined. In addition, 6 four-week-old male Wistar-Bonn/Kobori rats were sacrificed and studied as starting reference. Finally, Wistar rats (n=36) were studied as controls.


METHODS
TP53INP1 mRNA expression was determined by reverse transcription-polymerase chain reaction using semi-quantitative analysis, direct sequencing and in situ hybridization.


RESULTS
TP53INP1 mRNA was strongly expressed at 12 weeks when chronic pancreatitis developed, with a second peak at 20 weeks. The expression kinetics of TP53INP1 mRNA paralleled acinar cell apoptosis assessed by terminal deoxynucleotidyl transferase-mediated dUTP nick end labeling. The p53 mRNA expression showed a single peak at 12 weeks. In situ hybridization revealed that TP53INP1 mRNA was expressed mainly in acinar cells. Therapeutic drugs such as camostat mesilate and a herbal medicine Saiko-keishi-to suppressed the TP53INP1 mRNA expression. TP53INP1 mRNA induction in acinar cells was confirmed with in vitro experiments using an arginine-induced rat pancreatic acinar AR4-2J cell injury model.


CONCLUSIONS
TP53INP1 expression may reflect the acute-phase response and apoptosis of acinar cells in the course of chronic pancreatitis.
Jiang
Pei-Hong
PH
Department of Internal Medicine and Medical Oncology, Cancer Research Institute, Kanazawa University, Kanazawa, Japan.
Motoo
Yoshiharu
Y
Iovanna
Juan Lucio
JL
Pébusque
Marie-Josèphe
MJ
Xie
Min-Jue
MJ
Okada
Gensaku
G
Sawabu
Norio
N
D000818:Animals; D017209:Apoptosis / Q000235:genetics / Q000502:physiology; D051017:Apoptosis Regulatory Proteins; D001120:Arginine / Q000494:pharmacology; D002352:Carrier Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D002460:Cell Line; D002908:Chronic Disease; D004365:Drugs, Chinese Herbal / Q000494:pharmacology / Q000627:therapeutic use; D004952:Esters; D016670:Gabexate / Q000031:analogs & derivatives* / Q000494:pharmacology / Q000627:therapeutic use; D005786:Gene Expression Regulation / Q000187:drug effects* / Q000235:genetics; D006146:Guanidines; D006360:Heat-Shock Proteins / Q000096:biosynthesis* / Q000235:genetics / Q000502:physiology; D007150:Immunohistochemistry / Q000379:methods; D017403:In Situ Hybridization / Q000379:methods; D008297:Male; D009687:Nuclear Proteins; D010179:Pancreas / Q000737:chemistry / Q000187:drug effects / Q000473:pathology; D010195:Pancreatitis / Q000188:drug therapy / Q000235:genetics* / Q000378:metabolism; D012333:RNA, Messenger / Q000096:biosynthesis / Q000235:genetics; D051381:Rats; D011914:Rats, Inbred BN; D011919:Rats, Inbred Strains; D017208:Rats, Wistar; D012689:Sequence Homology, Nucleic Acid; D016159:Tumor Suppressor Protein p53 / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology / Q000378:metabolism
D051017:Apoptosis Regulatory Proteins; D002352:Carrier Proteins; D004365:Drugs, Chinese Herbal; D004952:Esters; D006146:Guanidines; D006360:Heat-Shock Proteins; D009687:Nuclear Proteins; D012333:RNA, Messenger; C498966:Tp53INP1 protein, rat; D016159:Tumor Suppressor Protein p53; C034532:camostat; D016670:Gabexate; C018142:saiko-keishi-to; D001120:Arginine