Angiogenesis, the growth of new blood vessels, is a crucial process in the development and progression of cancer and eye diseases. Inhibition of angiogenesis is therefore an important curative and palliative treatment strategy. However, present therapeutic approaches are indirect, aimed at tumor and/or stromal cell derived growth factor actions, and have therefore limited efficacy. Improvement is foreseen in targeting alternative pathways and molecules in the pathologic neovasculature directly.
In angiogenesis, the functional shift of quiescent endothelial cells (ECs) into activated phenotypes that migrate and proliferate to form a sprouting blood vessel is a key event. So far, three specific EC phenotypes have been identified in angiogenic sprouts, each with a distinct cellular and functional phenotype: (1) “tip cells” pick up guidance signals and migrate through the extracellular matrix; (2) “stalk cells” proliferate, produce extracellular matrix, and form a vessel lumen; and (3) “phalanx cells” form a quiescent monolayer in the maturing vessel. As the formation and proper functioning of both stalk and tip cells is essential for the process of angiogenic sprouting, these cells form attractive targets for the development of alternative ways of therapeutic inhibition of angiogenesis in cancer and ocular disease.
For a number of years, the Ocular Angiogenesis Group has developed a model for tip cells in vitro, which made research on tip cells considerably easier. In addition to research into cell biological mechanisms in these cells, we use this in vitro tip cell model to discover new mechanisms and proteins that could serve as a target for anti-angiogenesis in patients.
Cells (2021) 10:926
Angiogenesis in gynecological cancers and the options for anti-angiogenesis therapy.
Biochimica et Biophysica Acta (BBA) - Reviews on Cancer (2021) 1875:188446
IGF-binding proteins 3 and 4 are regulators of sprouting angiogenesis.
Mol Biol Rep (2020) 47:2561-2572
The role of glycolysis and mitochondrial respiration in the formation and functioning of endothelial tip cells during angiogenesis.
Scientific Reports (2019) 9:12608
Endothelial tip cells in vitro are less glycolytic and have a more flexible response to metabolic stress than non-tip cells.
Scientific Reports (2019) 9:10414
Anti-angiogenic effects of crenolanib are mediated by mitotic modulation independently of PDGFR expression.
Br. J. Cancer (2019) 121:139–149
IGF2 and IGF1R identified as novel tip cell genes in primary microvascular endothelial cell monolayers
Angiogenesis (2018) 1:823-836
Consensus guidelines for the use and interpretation of angiogenesis assays.
Angiogenesis (2018) 21:425-532.
Computational Screening of Tip and Stalk Cell Behavior Proposes a Role for Apelin Signaling in Sprout Progression.
PLoS One (2016) 11:e0159478.
CD34 Promotes Pathological Epi-Retinal Neovascularization in a Mouse Model of Oxygen-Induced Retinopathy.
PLoS One (2016) 11:e0157902.
Role of sulfatase 2 in lipoprotein metabolism and angiogenesis.
Curr Opin Lipidol (2016) 27:181-6.
Tip Cells in Angiogenesis
In: eLS. John Wiley & Sons Ltd, Chichester.
Computational Screening of Angiogenesis Model Variants Predicts that Differential Chemotaxis Helps Tip Cells Move to the Sprout Tip and Accelerates Sprouting.
Rapid optimization of drug combinations for the optimal angiostatic treatment of cancer.
Angiogenesis (2015) 18:233-44.
Endothelial tip cells in ocular angiogenesis: potential target for anti-angiogenesis therapy. Review.
J Histochem Cytochem (2013) 61:101-15.
CD34 marks angiogenic tip cells in human vascular endothelial cell cultures.
Angiogenesis (2012) 15:151-63.