Enhanced hepatocyte growth factor signaling by type II transforming growth factor-β receptor knockout fibroblasts promotes mammary tumorigenesis

Nikki Cheng, Anna Chytil, Yu Shyr, Alison Joly, Harold L. Moses

Research output: Contribution to journalArticlepeer-review

51 Citations (Scopus)

Abstract

Transforming growth factor-β (TGF-β) plays complex dual roles as an inhibitor and promoter of tumor progression. Although the influence of the stromal microenvironment on tumor progression is well recognized, little is known about the functions of TGF-β signaling in the stroma during tumor progression. Using cre-lox technology, expression of the type II TGF-β receptor was selectively knocked out in fibroblasts (Tgfbr2FspKO). In a co-xenograft model, we show that Tgfbr2EspKO fibroblasts enhance mammary carcinoma growth and metastasis in mice while increasing hepatocyte growth factor (HGF) expression and c-Met signaling downstream pathways including signal transducers and activators of transcription 3 (Stat3) and p42/44 mitogen-activated protein kinase (MAPK). Treatment of tumor-bearing mice with a pharmacologic inhibitor (EXEL-7592) of c-Met blocks tumor progression and reduces levels of phospho-Stat3 and phospho-p42/44 MAPK. Similarly, small interfering RNA knockdown of c-Met expression in mammary tumor cells reduces metastasis and c-Met signaling caused by Tgfbr2FspKO fibroblasts. The results show that TGF-β signaling in fibroblasts suppresses tumor metastasis by antagonizing HGF/c-Met signaling within tumor epithelial cells. Furthermore, this co-xenograft model represents a unique context to study stromal TGF-β and HGF signaling in mammary tumorigenesis.

Original languageEnglish
Pages (from-to)4869-4877
Number of pages9
JournalCancer Research
Volume67
Issue number10
DOIs
Publication statusPublished - 2007 May 15

All Science Journal Classification (ASJC) codes

  • Oncology
  • Cancer Research

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