Biglycan is overexpressed in pancreatic cancer and induces G1-arrest in pancreatic cancer cell lines.

Abstract:

BACKGROUND & AIMS:Biglycan (PG-I), a component of the extracellular matrix (ECM), is overexpressed in pancreatic cancer. To determine possible matrix-tumor interactions, we investigated the effects of PG-I on pancreatic cancer. METHODS:PG-I expression in cell lines and tissue samples was examined by Northern blot and immunofluorescence. The effect of PG-I on proliferation was determined by measuring activity of Ras, ERK, Rb, [(3)H]-thymidine incorporation, and cell cycle analysis. Expression of cyclin A, B1, D1, E1, G1, PCNA, p21, and p27 was analyzed by Northern and Western blots. RESULTS:PG-I was overexpressed in the ECM of pancreatic cancer samples compared with normal pancreas or chronic pancreatitis tissues. Addition of transforming growth factor (TGF)-beta induced PG-I expression in HFL and HFFF2 fibroblasts as well as in the pancreatic cancer cell line PANC-1. PG-I inhibited growth of both TGF-beta-responsive and TGF-beta-unresponsive pancreatic cancer cells by inducing G1-arrest, which is accompanied by an increase of p27 and reduction of cyclin A and proliferating cell nuclear antigen. Furthermore, endogenous Ras and ERK activation was partly reduced by PG-I in vitro. CONCLUSIONS:The ECM protein PG-I inhibits growth by arresting pancreatic cancer cells in G1 and may be part of a host defense mechanism aimed at slowing down pancreatic tumor progression.

journal_name

Gastroenterology

journal_title

Gastroenterology

authors

Weber CK,Sommer G,Michl P,Fensterer H,Weimer M,Gansauge F,Leder G,Adler G,Gress TM

doi

10.1053/gast.2001.27222

keywords:

subject

Has Abstract

pub_date

2001-09-01 00:00:00

pages

657-67

issue

3

eissn

0016-5085

issn

1528-0012

pii

S0016508501397688

journal_volume

121

pub_type

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