Intra and extravascular transmembrane signalling of angiopoietin-1-Tie2 receptor in health and disease

Molecular Medicine

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Abstract

Introduction Background, structural characteristics and distribution of Tie2 Background, structural characteristics and distribution of Ang-1 Regulation of Tie2 signalling Physiological roles Pathophysiological role Ang-1-Tie2R and rheumatoid arthritis Ang-1-Tie2 and cancer Ang-1-Tie2R and asthma Therapeutic implications Conclusion Abstract Angiopoietin-1 (Ang-1) is the primary agonist for Tie2 tyrosine kinase receptor (Tie2), and the effect of Ang-1-Tie2 signalling is context-dependent. Deficiency in either Ang-1 or Tie2 protein leads to severe microvascular defects and subsequent embryonic lethality in murine model. Tie2 receptors are expressed in several cell types, including endothelial cells, smooth muscle cells, fibroblasts, epithelial cells, monocytes, neutrophils, eosinophils and glial cells. Ang-1-Tie2 signalling induces a chemotactic effect in smooth muscle cells, neutrophils and eosinophils, and induces differentiation of mesenchymal cells to smooth muscle cells. Additionally, this signalling pathway induces the secretion of serotonin, matrix metalloproteinases (MMPs) and plasmin. Ang-1 inhibits the secretion of tissue inhibitor of matrix metalloproteinase (TIMPs). Aberrant expression and activity of Tie2 in vascular and non-vascular cells may result in the development of rheumatoid arthritis, cancer, hypertension and psoriasis. Ang-1 has an anti-inflammatory effect, when co-localized with vascular endothelial growth factor (VEGF) in the vasculature. Thus, Ang-1 could be potentially important in the therapy of various pathological conditions such as pulmonary hypertension, arteriosclerosis and diabetic retinopathy. In this article, we have summarized and critically reviewed the pathophysiological role of Ang-1-Tie2 signalling pathway.

Original languageEnglish
Pages (from-to)810-828
Number of pages19
JournalJournal of Cellular and Molecular Medicine
Volume12
Issue number3
DOIs
StatePublished - Jun 2008

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TIE-2 Receptor
Angiopoietin-1
Molecular Medicine
Medicine
Health
Cells
Smooth Muscle Myocytes
Muscle
Eosinophils
Rheumatoid Arthritis
Neutrophils
Tissue Inhibitor of Metalloproteinases
Matrix Metalloproteinase Inhibitors
Arteriosclerosis
Secretory Pathway
Fibrinolysin
Endothelial cells
Receptor Protein-Tyrosine Kinases
Diabetic Retinopathy
Fibroblasts

All Science Journal Classification (ASJC) codes

  • Biochemistry, Genetics and Molecular Biology(all)
  • Biochemistry

Cite this

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abstract = "Introduction Background, structural characteristics and distribution of Tie2 Background, structural characteristics and distribution of Ang-1 Regulation of Tie2 signalling Physiological roles Pathophysiological role Ang-1-Tie2R and rheumatoid arthritis Ang-1-Tie2 and cancer Ang-1-Tie2R and asthma Therapeutic implications Conclusion Abstract Angiopoietin-1 (Ang-1) is the primary agonist for Tie2 tyrosine kinase receptor (Tie2), and the effect of Ang-1-Tie2 signalling is context-dependent. Deficiency in either Ang-1 or Tie2 protein leads to severe microvascular defects and subsequent embryonic lethality in murine model. Tie2 receptors are expressed in several cell types, including endothelial cells, smooth muscle cells, fibroblasts, epithelial cells, monocytes, neutrophils, eosinophils and glial cells. Ang-1-Tie2 signalling induces a chemotactic effect in smooth muscle cells, neutrophils and eosinophils, and induces differentiation of mesenchymal cells to smooth muscle cells. Additionally, this signalling pathway induces the secretion of serotonin, matrix metalloproteinases (MMPs) and plasmin. Ang-1 inhibits the secretion of tissue inhibitor of matrix metalloproteinase (TIMPs). Aberrant expression and activity of Tie2 in vascular and non-vascular cells may result in the development of rheumatoid arthritis, cancer, hypertension and psoriasis. Ang-1 has an anti-inflammatory effect, when co-localized with vascular endothelial growth factor (VEGF) in the vasculature. Thus, Ang-1 could be potentially important in the therapy of various pathological conditions such as pulmonary hypertension, arteriosclerosis and diabetic retinopathy. In this article, we have summarized and critically reviewed the pathophysiological role of Ang-1-Tie2 signalling pathway.",
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