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The role of the Angiopoietins in vascular morphogenesis

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Abstracts

The Angiopoietin/Tie system acts as a vascular specific ligand/receptor system to control endothelial cell survival and vascular maturation. The Angiopoietin family includes four ligands (Angiopoietin-1, Angiopoietin-2 and Angiopoietin-3/4) and two corresponding tyrosine kinase receptors (Tie1 and Tie2). Ang-1 and Ang-2 are specific ligands of Tie2 binding the receptor with similar affinity. Tie2 activation promotes vessel assembly and maturation by mediating survival signals for endothelial cells and regulating the recruitment of mural cells. Ang-1 acts in a paracrine agonistic manner inducing Tie2 phosphorylation and subsequent vessel stabilization. In contrast, Ang-2 is produced by endothelial cells and acts as an autocrine antagonist of Ang-1-mediated Tie2 activation. Ang-2 thereby primes the vascular endothelium to exogenous cytokines and induces vascular destabilization at higher concentrations. Ang-2 is strongly expressed in the vasculature of many tumors and it has been suggested that Ang-2 may act synergistically with other cytokines such as vascular endothelial growth factor to promote tumor-associated angiogenesis and tumor progression. The better mechanistic understanding of the Ang/Tie system is gradually paving the way toward the rationale exploitation of this vascular signaling system as a therapeutic target for neoplastic and non-neoplastic diseases.

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  1. Markus Thomas

    Present address: Roche Diagnostics GmbH, Pharma Research Penzberg, Penzberg, Germany

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  1. Joint Research Division Vascular Biology, Medical Faculty Mannheim (CBTM), University of Heidelberg, Im Neuenheimer Feld 280, 69120, Heidelberg, Germany

    Markus Thomas & Hellmut G. Augustin

  2. German Cancer Research Center Heidelberg (DKFZ-ZMBH Alliance), Im Neuenheimer Feld 280, 69120, Heidelberg, Germany

    Markus Thomas & Hellmut G. Augustin

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Thomas, M., Augustin, H.G. The role of the Angiopoietins in vascular morphogenesis. Angiogenesis 12, 125–137 (2009). https://doi.org/10.1007/s10456-009-9147-3

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