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Mouse Models for Graft Arteriosclerosis
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Addressing thrombogenicity in vascular graft construction.

Sandip Sarkar1, Kevin M Sales, George Hamilton

  • 1Biomaterials and Tissue Engineering Centre (BTEC), Academic Division of Surgical and Interventional Sciences, University College London, London, United Kingdom.

Journal of Biomedical Materials Research. Part B, Applied Biomaterials
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Synthetic vascular grafts face thrombosis issues, impacting bypass surgery success. Surface modifications and endothelial cell seeding aim to create non-thrombogenic grafts for improved patient outcomes.

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Area of Science:

  • Biomaterials Science
  • Vascular Surgery
  • Biomedical Engineering

Background:

  • Thrombosis significantly reduces the patency of synthetic vascular grafts, particularly for small-diameter vessels (< 6 mm).
  • Arterial walls possess inherent anti-thrombogenic mechanisms within vascular endothelial cells that maintain a non-thrombogenic environment.
  • Surface modification of synthetic grafts is crucial for attenuating the coagulation cascade and improving graft patency.

Purpose of the Study:

  • To explore strategies for developing synthetic vascular grafts with enhanced anti-thrombogenic properties.
  • To investigate surface modification techniques and endothelial cell seeding for improved graft performance.
  • To reduce thrombosis and enhance patency in synthetic grafts for bypass procedures.

Main Methods:

  • Developing synthetic grafts with hydrophilic materials and negative surface charges to minimize platelet adhesion.
  • Utilizing amphiphilic materials to reduce fibrinogen adhesion and subsequent platelet activation.
  • Investigating surface modifications to promote endothelialization and exploring in vitro endothelial cell seeding prior to implantation.

Main Results:

  • Surface modification strategies have shown promise in reducing thrombosis and improving graft patency in vitro and in animal models.
  • Hydrophilic materials with negative surface charges and amphiphilic materials demonstrate reduced platelet adhesion.
  • Surface modification to promote endothelialization has yielded positive results in animal studies.

Conclusions:

  • Novel synthetic grafts incorporating anti-thrombogenic properties are essential for successful coronary and distal infrainguinal bypass.
  • Effective surface modification methods are critical for the success of synthetic vascular grafts.
  • Endothelial cell seeding offers a promising approach to overcome challenges in spontaneous endothelialization for human applications.