A novel, microcarrier-based in vitro assay for rapid and reliable quantification of three-dimensional cell migration and angiogenesis

Microvascular Research
V Nehls, D Drenckhahn

Abstract

Angiogenesis in situ occurs within the interstitial extracellular matrix. The complexity of currently used three-dimensional in vitro angiogenesis systems makes it difficult to quantify cellular growth and neovessel formation. To overcome this problem we were interested to develop an angiogenesis system which allows rapid and reliable quantification of three-dimensional neovessel formation in vitro. Endothelial cells were seeded on gelatine-coated microcarriers (MCs). Cell-coated MCs were suspended in a solution of fibrinogen which was then induced to polymerize by addition of thrombin. By this way, MCs were entrapped in a three-dimensional fibrin matrix. Within a few hours, endothelial cells began to leave their supporting microcarriers and to migrate into the fibrin gel. Without addition of stimulators of angiogenesis, endothelial cells showed incoherent migration into the matrix. In contrast, in response to fibronectin, basic fibroblast growth factor (bFGF), or vascular endothelial growth factor (VEGF), respectively, endothelial cells assembled to form multicellular capillary-like structures occasionally exceeding 1000 microns in length. Each MC gave rise to a limited number of capillaries. A single culture dish contained hu...Continue Reading

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