Angiogenesis

, Volume 8, Issue 3, pp 197–204

Autocrine vascular endothelial growth factor signalling in breast cancer. Evidence from cell lines and primary breast cancer cultures in vitro

  • Melanie Weigand
  • Pia Hantel
  • Rolf Kreienberg
  • Johannes Waltenberger
Article

DOI: 10.1007/s10456-005-9010-0

Cite this article as:
Weigand, M., Hantel, P., Kreienberg, R. et al. Angiogenesis (2005) 8: 197. doi:10.1007/s10456-005-9010-0

Abstract

Inhibition of angiogenesis has become a major target in experimental cancer therapies. Vascular endothelial growth factor (VEGF) and its receptors are essential for breast cancer progression and relevant targets in experimental anti-angiogenesis. VEGF, produced by carcinoma cells, acts in a paracrine fashion on endothelial cells and displays autocrine activity on carcinoma cells. Breast cancer cells express VEGF-A, VEGF-B, VEGF-C and their receptors VEGFR-1 (Flt-1), VEGFR-2 (Flk-1/KDR) and neuropilin (NP-1/NP-2). VEGF-A triggers cellular signalling, an invasive phenotype of certain breast cancer cell lines and influences cell survival. However, such an autocrine VEGF/VEGFR signalling loop remains to be established. We demonstrate production of VEGF-A in cell lines MDA-MB-468, T47d, MCF-7, HBL-100 and in a primary breast cancer culture. Moreover, these cells showed baseline VEGFR-2 tyrosine-phosphorylation that could be enhanced by VEGF-A stimulation. In addition, VEGF-A leads to increased phosphorylation of ERK1/2 and Akt indicating that VEGF-A stimulation plays a crucial role in the regulation of cell growth, apoptosis, survival and differentiation. Moreover, we have established a novel breast cancer cell culture MW1 that expresses high levels of VEGF-A. We demonstrate that VEGFR-2 on the surface of breast cancer cells is functional and is capable of being stimulated by external VEGF-A. VEGF-A production by and VEGFR-2 activation on the surface of breast cancer cells indicates the presence of a distinct autocrine signalling loop that enables breast cancer cells to promote their own growth and survival by phosphorylation and activation of VEGFR-2. Moreover, this autocrine loop represents an attractive therapeutic target.

Keywords

angiogenesisautocrine signallingbreast cancercell cultureKDRVEGF

Abbreviations

ATCC

American Type Culture Collection

EGFR

epidermal growth factor receptor

IGFR

insulin-like growth factor receptor

PI3-kinase

phosphatidylinositol 3′-kinase

VEGF

vascular endothelial growth factor

VEGFR

vascular endothelial growth factor receptor

Copyright information

© Springer Science+Business Media, Inc. 2005

Authors and Affiliations

  • Melanie Weigand
    • 1
    • 3
  • Pia Hantel
    • 1
  • Rolf Kreienberg
    • 1
  • Johannes Waltenberger
    • 2
  1. 1.Department of Gynaecology and ObstetricsUniversity of UlmUlmGermany
  2. 2.Department of Interventional CardiologyUniversity of MaastrichtMaastrichtThe Netherlands
  3. 3.Department of Cancer BiologyUniversity of Massachusetts Medical SchoolWorcesterUSA