Expression of p8 in human pancreatic cancer.
The p8 gene is a recently identified gene with mitogenic activity. p8 expression is induced in acute pancreatitis, pancreatic development, and regeneration. However, the expression of p8 in pancreatic cancer is not reported. We investigated p8 expression in 72 human pancreatic tissues, including 38 pancreatic cancers (PCs), by immunohistochemistry. p8 was overexpressed (positive cells >25% in 1,000 cells) in 71% (27 of 38) of PCs, but in only 17% (3 of 18) of chronic pancreatitis cases. There was no overexpression in mucinous cystadenoma or in normal pancreas. The p8 overexpression rate in PC was significantly higher than that in other conditions (P < 0.05). Reverse transcription-PCR analysis confirmed p8 mRNA overexpression (tumor/nontumor ratio >2) in 75% (3 of 4) of PCs. p8 was overexpressed also in human pancreatic cancer cell lines (MIA PaCa-2 and PANC-1). These results suggest that p8 is involved in the development of pancreatic cancer, reflecting its mitogenic activity.
Department of Internal Medicine and Medical Oncology, Cancer Research Institute, Kanazawa University, Japan.
S B
SB
Su
Y
Y
Motoo
J L
JL
Iovanna
M J
MJ
Xie
H
H
Mouri
K
K
Ohtsubo
Y
Y
Yamaguchi
H
H
Watanabe
T
T
Okai
F
F
Matsubara
N
N
Sawabu
D000368:Aged; D000369:Aged, 80 and over; D051792:Basic Helix-Loop-Helix Proteins; D018196:Carcinoma, Adenosquamous / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D021441:Carcinoma, Pancreatic Ductal / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D017931:DNA Primers / Q000737:chemistry; D004268:DNA-Binding Proteins; D005260:Female; D015870:Gene Expression; D006133:Growth Substances / Q000096:biosynthesis / Q000235:genetics*; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins; D010190:Pancreatic Neoplasms / Q000235:genetics* / Q000378:metabolism / Q000473:pathology; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000032:analysis / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D014407:Tumor Cells, Cultured / Q000166:cytology
D051792:Basic Helix-Loop-Helix Proteins; D017931:DNA Primers; D004268:DNA-Binding Proteins; D006133:Growth Substances; D009363:Neoplasm Proteins; D012333:RNA, Messenger; C491643:NUPR1 protein, human