Transfection of the type I TGF-beta receptor restores TGF-beta responsiveness in pancreatic cancer.

Abstract:

:Transforming growth factor-beta (TGF-beta) signaling is initiated following heterodimerization of the type II TGF-beta receptor (TbetaRII) with the type I TGF-beta receptor (TbetaRI). Both receptors are required for TGF-beta responsiveness. In the present study, we characterized the actions of TGF-beta1 in T3M4 human pancreatic cancer cells, which express low levels of TbetaRI and high levels of TbetaRII. Cells were transiently transfected with p3TP-Lux, a TGF-beta-responsive luciferase reporter gene construct. TGF-beta1 was without effect in parental T3M4 cells, but caused a time- and dose-dependent increase in luciferase activity in T3M4 cells co-transfected with a TbetaRI cDNA expression vector. Co-transfection of TbetaRI with a truncated Smad4 cDNA that is known to block TGF-beta-dependent signaling, abrogated the TbetaRI-induced increase in luciferase activity. Sequencing of the TbetaRI and the Smad4 genes in T3M4 cells did not reveal any mutations. These findings indicate that one mechanism for TGF-beta resistance in pancreatic cancer is due to a quantitative decrease in TbetaRI expression.

journal_name

Int J Cancer

authors

Wagner M,Kleeff J,Lopez ME,Bockman I,Massaqué J,Korc M

doi

10.1002/(sici)1097-0215(19981005)78:2<255::aid-ijc

subject

Has Abstract

pub_date

1998-10-05 00:00:00

pages

255-60

issue

2

eissn

0020-7136

issn

1097-0215

pii

10.1002/(SICI)1097-0215(19981005)78:2<255::AID-IJC

journal_volume

78

pub_type

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