Physical and Chemical Signals That Promote Vascularization of Capillary-Scale Channels

Overview

Journal Cell Mol Bioeng

Publisher Springer

Specialty Biomedical Engineering

Date 2016 Apr 26

PMID 27110295

Citations 25

Authors

Raleigh M Linville

Nelson F Boland

Gil Covarrubias

Gavrielle M Price

Joe Tien

Affiliations

Soon will be listed here.

Abstract

Proper vascularization remains critical to the clinical application of engineered tissues. To engineer microvessels in vitro, we and others have delivered endothelial cells through preformed channels into patterned extracellular matrix-based gels. This approach has been limited by the size of endothelial cells in suspension, and results in plugging of channels below ~30 μm in diameter. Here, we examine physical and chemical signals that can augment direct seeding, with the aim of rapidly vascularizing capillary-scale channels. By studying tapered microchannels in type I collagen gels under various conditions, we establish that stiff scaffolds, forward pressure, and elevated cyclic AMP levels promote endothelial stability and that reverse pressure promotes endothelial migration. We applied these results to uniform 20-μm-diameter channels and optimized the magnitudes of pressure, flow, and shear stress to best support endothelial migration and vascular stability. This vascularization strategy is able to form millimeter-long perfusable capillaries within three days. Our results indicate how to manipulate the physical and chemical environment to promote rapid vascularization of capillary-scale channels within type I collagen gels.

Citing Articles

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