Cell Reports (Oct 2013)

Tenascin-C Downregulates Wnt Inhibitor Dickkopf-1, Promoting Tumorigenesis in a Neuroendocrine Tumor Model

  • Falk Saupe,
  • Anja Schwenzer,
  • Yundan Jia,
  • Isabelle Gasser,
  • Caroline Spenlé,
  • Benoit Langlois,
  • Martial Kammerer,
  • Olivier Lefebvre,
  • Ruslan Hlushchuk,
  • Tristan Rupp,
  • Marija Marko,
  • Michael van der Heyden,
  • Gérard Cremel,
  • Christiane Arnold,
  • Annick Klein,
  • Patricia Simon-Assmann,
  • Valentin Djonov,
  • Agnès Neuville-Méchine,
  • Irene Esposito,
  • Julia Slotta-Huspenina,
  • Klaus-Peter Janssen,
  • Olivier de Wever,
  • Gerhard Christofori,
  • Thomas Hussenet,
  • Gertraud Orend

DOI
https://doi.org/10.1016/j.celrep.2013.09.014
Journal volume & issue
Vol. 5, no. 2
pp. 482 – 492

Abstract

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The extracellular matrix molecule tenascin-C (TNC) is a major component of the cancer-specific matrix, and high TNC expression is linked to poor prognosis in several cancers. To provide a comprehensive understanding of TNC’s functions in cancer, we established an immune-competent transgenic mouse model of pancreatic β-cell carcinogenesis with varying levels of TNC expression and compared stochastic neuroendocrine tumor formation in abundance or absence of TNC. We show that TNC promotes tumor cell survival, the angiogenic switch, more and leaky vessels, carcinoma progression, and lung micrometastasis. TNC downregulates Dickkopf-1 (DKK1) promoter activity through the blocking of actin stress fiber formation, activates Wnt signaling, and induces Wnt target genes in tumor and endothelial cells. Our results implicate DKK1 downregulation as an important mechanism underlying TNC-enhanced tumor progression through the provision of a proangiogenic tumor microenvironment.