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Tissue engineering of a hybrid bypass graft for coronary and lower limb bypass surgery

S. T. Rashid^*, B. Fuller^*, G. Hamilton and A. M. Seifalian^*,1

^* Biomaterial and Tissue Engineering Centre (BTEC), Royal Free and University College Medical School, University College London, London, UK; and

Vascular Unit, Royal Free Hampstead National Health Service Trust, London, UK

¹Correspondence: Biomaterials and Tissue Engineering Centre, Academic Division of Surgical and Interventional Sciences, University College London, Rowland Hill Street, London NW3 2PF, UK. E-mail: a.seifalian{at}ucl.ac.uk

Tissue-engineered blood vessels have largely relied on inelastic scaffolds or biological solutions with uncertain long-term in vivo durability. In this report we present for the first time a hybrid tissue-engineered bypass graft consisting of an elastic scaffold of compliant poly(carbonate-urea)urethane (CPU), incorporated with human smooth muscle cells (SMCs) and endothelial cells (ECs) from the same human source. Human vascular SMCs and ECs were extracted from umbilical cord vessels. The effect of shear stress preconditioning on cell retention on the hybrid bypass graft was investigated under pulsatile arterial flow conditions. Retention of ECs seeded onto CPU precoated with SMCs was significantly improved by a period of shear stress preconditioning, especially when the stress incrementally increased. This is probably because the mechanical stimuli orient cells and increase the release of matrix proteins and attachment factors. The stage is now set for developing a hybrid graft for in vivo studies.—Rashid, S. T., Fuller, B., Hamilton, G., and Seifalian, A. M. Tissue engineering of a hybrid bypass graft for coronary and lower limb bypass surgery.

Key Words: compliance • polyurethanes • shear stress • smooth muscle cell • endothelial cell