Cited by 101Cell Adhesion Molecules ResearchAngiogenesis and VEGF in CancerBarrier Structure and Function Studies

Angiopoietin-2 Stimulation of Endothelial Cells Induces αvβ3 Integrin Internalization and Degradation

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Thomas, Markus, Felcht, Moritz, Kruse, Karoline, Kretschmer, Stella, Deppermann, Carleen, Biesdorf, Andreas, Rohr, Karl, Benest, Andrew V. +2 more·2010·Journal of Biological Chemistry

Abstract

The angiopoietins (Ang-1 and Ang-2) have been identified as agonistic and antagonistic ligands of the endothelial receptor tyrosine kinase Tie2, respectively. Both ligands have been demonstrated to induce translocation of Tie2 to cell-cell junctions. However, only Ang-1 induces Tie2-dependent Akt activation and subsequent survival signaling and endothelial quiescence. Ang-2 interferes negatively with Ang-1/Tie2 signaling, thereby antagonizing the Ang-1/Tie2 axis. Here, we show that both Ang-1 and Ang-2 recruit beta3 integrins to Tie2. This co-localization is most prominent in cell-cell junctions. However, only Ang-2 stimulation resulted in complex formation among Tie2, alphavbeta3 integrin, and focal adhesion kinase as evidenced by co-immunoprecipitation experiments. Focal adhesion kinase was phosphorylated in the FAT domain at Ser(910) upon Ang-2 stimulation and the adaptor proteins p130Cas and talin dissociated from alphavbeta3 integrin. The alphavbeta3 integrin was internalized, ubiquitinylated, and gated toward lysosomes. Taken together, the experiments define Tie2/alphavbeta3 integrin association-induced integrin internalization and degradation as mechanistic consequences of endothelial Ang-2 stimulation.

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Crossref · 10.1074/jbc.m109.097543

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Authors
Thomas, M., Felcht, M., Kruse, K., Kretschmer, S., Deppermann, C., Biesdorf, A., Rohr, K., Benest, A. V., Fiedler, U., & Augustin, H. G.
Affiliations
  • Heidelberg University (DE)
  • German Cancer Research Center (DE)
Corresponding author
Augustin, Hellmut G.
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2010-07
Volume
285
Issue
31
Pages
23842-23849
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2002769583
Cited by
101
References
44
Citations by year
2026: 4 · 2025: 2 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 6 · 2020: 6 · 2019: 8 · 2018: 8 · 2017: 8 · 2016: 6 · 2015: 9 · 2014: 6 · 2013: 14 · 2012: 9
FWCI
7.04
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Deutsches Krebsforschungszentrum
  • Deutsche Forschungsgemeinschaft (SFB‐TR23)
Topics
  • Health Sciences › Medicine › Immunology and Allergy › Cell Adhesion Molecules Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
  • Life Sciences › Neuroscience › Neurology › Barrier Structure and Function Studies
Keywords
angiopoietin-2, angiopoietin-1, Tie2 receptor, integrin αvβ3, integrin internalization, focal adhesion kinase, p130Cas, talin, ubiquitination, lysosomal degradation, endothelial cells, cell-cell contact, receptor tyrosine kinase signaling
MeSH terms
Cell Communication, Cell Line, Cell Movement, Endothelium, Vascular, Humans, Lysosomes, Models, Biological, Phosphorylation, Signal Transduction, Ubiquitin, Integrin alphaVbeta3, Angiopoietin-2, Endothelial Cells, Receptor, TIE-2, Immunoprecipitation

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