Naturally Produced Extracellular Matrix Is an Excellent Substrate for Canine Endothelial Cell Proliferation and Resistance to Shear Stress on PTFE Vascular Grafts

A Schneider; M Chandra; G Lazarovici; I Vlodavsky; G Merin; G Uretzky; J B Borman; H Schwalb

doi:10.1055/s-0038-1665417

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 1997; 78(05): 1392-1398
DOI: 10.1055/s-0038-1665417

Review Article

Schattauer GmbH Stuttgart

Naturally Produced Extracellular Matrix Is an Excellent Substrate for Canine Endothelial Cell Proliferation and Resistance to Shear Stress on PTFE Vascular Grafts

Authors

A Schneider

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel
M Chandra

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel
G Lazarovici

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel
I Vlodavsky

²Hadassah University Hospital, Hebrew University Hadassah Medical School, Jerusalem and Cardiothoracic Surgery Dept. Haifa, Israel
G Merin

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel
G Uretzky

³Carmel Medical Center, Technion-lsrael Institute of Technology, Haifa, Israel
J B Borman

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel
H Schwalb

¹The Joseph Lunenfeld Cardiac Surgery Research Center, Oncology Dept. Haifa, Israel

Abstract

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Summary

Purpose: Successful development of a vascular prosthesis lined with endothelial cells (EC) may depend on the ability of the attached cells to resist shear forces after implantation. The present study was designed to investigate EC detachment from extracellular matrix (ECM) precoated vascular prostheses, caused by shear stress in vitro and to test the performance of these grafts in vivo. Methods: Bovine aortic endothelial cells were seeded inside untreated polytetrafluoro-ethylene (PTFE) vascular graft (10 X 0.6 cm), PTFE graft precoated with fibronectin (FN), or PTFE precoated with FN and a naturally produced ECM (10⁶ cells/graft). Sixteen hours after seeding the medium was replaced and unattached cells counted. The strength of endothelial cell attachment was evaluated by subjecting the grafts to a physiologic shear stress of 15 dynes/cm² for 1 h. The detached cells were collected and quantitated. PTFE or EC preseeded ECM coated grafts were implanted in the common carotid arteries of dogs. Results: While little or no differences were found in the extent of endothelial cell attachment to the various grafts (79%, 87% and 94% of the cells attached to PTFE, FN precoated PTFE, or FN+ECM precoated PTFE, respectively), the number of cells retained after a shear stress was significanly increased on ECM coated PTFE (20%, 54% and 85% on PTFE, FN coated PTFE, and FN+ECM coated PTFE, respectively, p <0.01). Implantation experiments in dogs revealed a significant increase in EC coverage and a reduced incidence of thrombus formation on ECM coated grafts that were seeded with autologous saphenous vein endothelial cells prior to implantation. Conclusion: ECM coating significantly increased the strength of endothelial cell attachment to vascular prostheses subjected to shear stress. The presence of adhesive macromolecules and potent endothelial cell growth promoting factors may render the ECM a promising substrate for vascular prostheses.

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References

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