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Effects and expression of TRAIL and its apoptosis-promoting receptors in human pancreatic cancer.

Abstract：

:Pancreatic cancer cells are usually resistant to apoptosis mediated by tumor necrosis factor (TNF)-alpha or FasL, and their toxicity towards normal cells hampers their application for therapeutic use. TNF-related apoptosis-inducing ligand (TRAIL), a novel member of the TNF family, triggers apoptosis in a variety of malignant cells, but exhibits less cytotoxicity in normal cells. To investigate the therapeutic potential of TRAIL, we analyzed the expression of TRAIL and its apoptosis-inducing receptors (DR4 and DR5) in the normal and cancerous human pancreas, and the sensitivity of pancreatic cancer cells to TRAIL cytotoxicity. TRAIL, DR4 and DR5 mRNA levels were concomitantly increased in pancreatic cancers compared with normal controls (P<0.01), and there were positive correlations between the expression levels of TRAIL and DR4, TRAIL and DR5 and between DR4 and DR5 mRNA (r=0.85, r=0.87, r=0.91; P<0.01). Immunostaining revealed the presence of the corresponding proteins frequently within the same cancer cells. In five pancreatic cancer cell lines, TRAIL, DR4 and DR5 mRNA expression was detectable at various levels. However, independent of the presence of DR4 and DR5, TRAIL cytotoxicity assays revealed that pancreatic cancer cells showed a significantly lower sensitivity (LD(50)>85 ng/ml) to TRAIL treatment than Jurkat T lymphoma cells (LD(50)=7.2 ng/ml). These findings show that pancreatic cancers are insensitive towards TRAIL-mediated apoptosis despite expression of TRAIL and its receptors, suggesting the presence of mediators which inhibit the TRAIL cell-death-inducing pathway in pancreatic cancer cells.

journal_name

Cancer Lett

journal_title

Cancer letters

authors

Ozawa F,Friess H,Kleeff J,Xu ZW,Zimmermann A,Sheikh MS,Büchler MW

doi

10.1016/s0304-3835(00)00660-1

keywords:

subject

Has Abstract

pub_date

2001-02-10 00:00:00

pages

71-81

issue

1

eissn

0304-3835

issn

1872-7980

pii

S0304383500006601

journal_volume

163

pub_type

杂志文章

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