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Angiopoietins in angiogenesis.
Journal article

Angiopoietins in angiogenesis.

  • Fagiani E Institute of Biochemistry and Genetics, Department of Biomedicine, University of Basel, Basel, Switzerland.
  • Christofori G
  • 2012-08-28
Published in:
  • Cancer letters. - 2013
Angiopoietins
Humans
Neoplasms
Neovascularization, Pathologic
Receptor, TIE-1
Receptor, TIE-2
Signal Transduction
English Tie-1 and Tie-2 tyrosine kinase receptors are expressed specifically on vascular endothelial cells and on a certain subtype of macrophages implicated in angiogenesis, thus, they have been a major focus of angiogenesis research. Tie-1 and Tie-2 are essential for vascular maturation during developmental, physiological and pathological angiogenesis. Angiopoietin 1-4 (Ang-1-4) have been identified as bona fide ligands of the Tie-2 receptor, while Tie-1 remains an orphan receptor which is able to heterodimerize with Tie-2 and to modulate Tie-2 signal transduction. The most exhaustively studied angiopoietins are Ang-1 and Ang-2. Ang-1 is a critical player in vessel maturation and it mediates migration, adhesion and survival of endothelial cells. Ang-2 disrupts the connections between the endothelium and perivascular cells and promotes cell death and vascular regression. Yet, in conjunction with VEGF, Ang-2 promotes neo-vascularization. Hence, angiopoietins exert crucial roles in the angiogenic switch during tumor progression, and increased expression of Ang-2 relative to Ang-1 in tumors correlates with poor prognosis. Its central role in the regulation of physiological and pathological angiogenesis makes the angiopoietin/Tie signaling pathway a therapeutically attractive target for the treatment of vascular disease and cancer.
Language
  • English
Open access status
closed
Identifiers
Persistent URL
https://sonar.ch/global/documents/53325
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