Tuning of collagen scaffold properties modulates embedded endothelial cell regulatory phenotype in repair of vascular injuries in vivo.

Abstract

Perivascularly implanted matrix embedded endothelial cells (MEECs) are potent regulators of inflammation and intimal hyperplasia following vascular injuries. Endothelial cells (ECs) in collagen scaffolds adopt a reparative phenotype with significant therapeutic potential. Although the biology of MEECs is increasingly understood, tuning of scaffold properties to control cell-substrate interactions is less well-studied. It is hypothesized that modulating scaffold degradation would change EC phenotype. Scaffolds with differential degradation are prepared by cross-linking and predegradation. Vascular injury increases degradation and the presence of MEECs retards injury-mediated degradation. MEECs respond to differential scaffold properties with altered viability in vivo, suppressed smooth muscle cell (SMC) proliferation in vitro, and altered interleukin-6 and matrix metalloproteinase-9 expression. When implanted perivascularly to a murine carotid wire injury, tuned scaffolds change MEEC effects on vascular repair and inflammation. Live animal imaging enables real-time tracking of cell viability, inflammation, and scaffold degradation, affording an unprecedented understanding of interactions between cells, substrate, and tissue. MEEC-treated injuries improve endothelialization and reduce SMC hyperplasia over 14 d. These data demonstrate the potent role material design plays in tuning MEEC efficacy in vivo, with implications for the design of clinical therapies.

• Authors: Shimon Unterman, Alina Freiman, Margarita Beckerman, Eytan Abraham, James R L Stanley, Ela Levy, Natalie Artzi, Elazer Edelman
• Journal: Advanced healthcare materials (Adv Healthc Mater) Vol. 4 Issue 15 Pg. 2220-8 (Oct 28 2015) ISSN: 2192-2659 [Electronic] Germany
• PMID: 26333178 (Publication Type: Journal Article, Research Support, N.I.H., Extramural)
• Copyright: © 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

Chemical References

• IL6 protein, human
• Interleukin-6
• Collagen
• MMP9 protein, human
• Matrix Metalloproteinase 9

Topics

• Adult
• Animals
• Cell Communication (drug effects)
• Cell Proliferation
• Cell Survival (drug effects)
• Cells, Cultured
• Collagen (chemistry)
• Endothelial Cells (cytology)
• Humans
• Interleukin-6 (genetics, metabolism)
• Male
• Matrix Metalloproteinase 9 (genetics, metabolism)
• Mice
• Myocytes, Smooth Muscle (drug effects, metabolism)
• Phenotype
• Tissue Scaffolds (chemistry)
• Vascular System Injuries (therapy)
• Young Adult