The search for a biologically based arterial graft that could function at small diameters has gone on for several decades, and multiple hurdles have been overcome during that time. In recent years, the previous limitation of inadequate mechanical strength has been overcome by several investigators, but extended times for autologous artery culture have limited widespread adaption or experimentation. Niklason reported in 2003 the feasibility of decellularizing engineered arteries, and we showed in the previous granting period that tissue engineered and decellularized grafts can function long-term in vivo, thereby shortening the required culture time to 4 weeks of autologous endothelial cell culture. Hence, one of the last significant hurdles in vascular tissue engineering is to produce tissue-based grafts that require no culture time, and that can resist thrombosis without having an autologous endothelial cell layer. The overall goal of this proposal is to develop non-cell-based means of inhibiting coagulation and platelet activation on decellularized engineered arteries, so that functional arterial grafts may be available "off the shelf". In this revised, competitive renewal, our approach is to inhibit both the coagulation cascade and platelet adhesion by intervening at multiple points. By incorporating a high density of covalently bound heparin onto the graft surface, we should inhibit coagulation factors XIIa, Xa, and IIa, and thereby reduce clot formation and platelet adhesion and aggregation. By coating the graft lumen with thrombospondin2- null matrix, platelet adhesion should be reduced, which in combination with thrombin inhibition by heparin should inhibit clot formation. Thrombospondin2-null matrix may also support endothelial adhesion and growth more than native collagen matrix that contains thrombospondin2, enabling better host endothelialization. These novel anti-coagulation strategies will be compared, using a comprehensive set of in vitro assays as well as large animal in vivo studies, with autologous endothelium for their ability to inhibit thrombosis of decellularized, engineered arterial grafts.

Public Health Relevance

Development of engineered arteries has advanced substantially over the past several decades, but progress has stopped short of a fully functional, off-the-shelf arterial conduit. Work in this application will build upon our progress in the last granting period, wherein we developed acellular tissue engineered matrices for use as vascular grafts. In this application, we will study the efficacy of several non-cellular modifications of the graft surface to reduce thrombogenicity, with the aim of creating a completely off-the-shelf vascular graft.

Agency
National Institute of Health (NIH)
Institute
National Heart, Lung, and Blood Institute (NHLBI)
Type
Research Project (R01)
Project #
5R01HL083895-07
Application #
8425044
Study Section
Bioengineering, Technology and Surgical Sciences Study Section (BTSS)
Program Officer
Lundberg, Martha
Project Start
2006-09-01
Project End
2015-11-30
Budget Start
2012-12-01
Budget End
2013-11-30
Support Year
7
Fiscal Year
2013
Total Cost
$536,931
Indirect Cost
$142,307
Name
Yale University
Department
Anesthesiology
Type
Schools of Medicine
DUNS #
043207562
City
New Haven
State
CT
Country
United States
Zip Code
06520
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Gui, Liqiong; Niklason, Laura E (2014) Vascular Tissue Engineering: Building Perfusable Vasculature for Implantation. Curr Opin Chem Eng 3:68-74
Raredon, Micha Sam Brickman; Niklason, Laura E (2014) A call to craft. Sci Transl Med 6:218fs1
Model, Lynn S; Hall, Michael R; Wong, Daniel J et al. (2014) Arterial shear stress reduces eph-b4 expression in adult human veins. Yale J Biol Med 87:359-71
Sundaram, Sumati; Echter, Andreana; Sivarapatna, Amogh et al. (2014) Small-diameter vascular graft engineered using human embryonic stem cell-derived mesenchymal cells. Tissue Eng Part A 20:740-50
Huang, Angela H; Niklason, Laura E (2014) Engineering of arteries in vitro. Cell Mol Life Sci 71:2103-18
Calle, Elizabeth A; Vesuna, Sam; Dimitrievska, Sashka et al. (2014) The use of optical clearing and multiphoton microscopy for investigation of three-dimensional tissue-engineered constructs. Tissue Eng Part C Methods 20:570-7
Gui, Liqiong; Boyle, Michael J; Kamin, Yishai M et al. (2014) Construction of tissue-engineered small-diameter vascular grafts in fibrin scaffolds in 30 days. Tissue Eng Part A 20:1499-507
Sundaram, Sumati; Niklason, Laura E (2012) Smooth muscle and other cell sources for human blood vessel engineering. Cells Tissues Organs 195:15-25
Quint, Clay; Arief, Melissa; Muto, Akihito et al. (2012) Allogeneic human tissue-engineered blood vessel. J Vasc Surg 55:790-8

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