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Surface Coating of Polytetrafluoroethylene with Extracellular Matrix and Anti-CD34 Antibodies Facilitates Endothelialization and Inhibits Platelet Adhesion Under Sheer Stress

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Tissue Engineering and Regenerative Medicine Aims and scope

Abstract

Expanded polytetrafluoroethylene (ePTFE) polymers do not support endothelialization because of nonconductive characteristics towards cellular attachment. Inner surface modification of the grafts can improve endothelialization and increase the long-term patency rate of the ePTFE vascular grafts. Here we reported a method of inner-surface modification of ePTFE vascular graft with extracellular matrix (ECM) and CD34 monoclonal antibodies (CD34 mAb) to stimulate the adhesion and proliferation of circulating endothelial progenitor cells on ePTFE graft to enhance graft endothelialization. The inner surface of ECM-coated ePTFE grafts were linked with CD34 mAb in the presence of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide/N-hydroxysuccinimide (EDC/NHS) solution and the physicochemical properties, surface morphology, biocompatibility, and hemocompatibility of the grafts were studied. The hydrophilicity of CD34 mAb-coated graft inner surface was significantly improved. Fourier transform infrared spectroscopy analysis confirmed ECM and CD34 mAb cross-linking in the ePTFE vascular grafts with our method. Scanning electron microscopy analysis showed protein layer covering uniformly on the inner surface of the modified grafts. The cell-counting kit-8 (CCK-8) assay confirmed that the modified graft has no obvious cytotoxicity. The modified graft showed a low hemolytic rate (0.9%) in the direct contact hemolysis test, suggesting the modification improved hemocompatibility of biopolymers. The modification also decreased adhesion of platelets, while significantly increased the adhesion of endothelial cells on the grafts. We conclude that our method enables ePTFE polymers modification with ECM and CD34 mAb, facilitates endothelialization, and inhibits platelet adhesion on the grafts, thus may increase the long-term patency rate of the prosthetic bypass grafts.

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Acknowledgements

The authors thank all of the study participants and research staff of the Guangzhou Vascular Disease Center. This work was supported by Science Foundation of Guangdong Province (2010B080701034).

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Authors and Affiliations

  1. Department of Vascular Surgery, The First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, 510080, China

    Lei Chen, Mian Wang & Xiaoxi Li

  2. Department of Vascular Surgery, The First Affiliated Hospital of Ji’nan University, Guangzhou, 510630, China

    Haipeng He

  3. Department of Vascular Surgery, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou, 510080, China

    Henghui Yin

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  1. Lei Chen
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  2. Haipeng He
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  3. Mian Wang
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  4. Xiaoxi Li
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Correspondence to Henghui Yin.

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Ethical Statement

This study was approved by the Clinical Research and Experimental Animal Ethics Committee of the First Affiliated Hospital of Sun Yat-Sen University (IRB no. 2015_07) and institutional review board of Guangdong Provincial Health Bureau and Sun Yat-sen University.

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Lei Chen and Haipeng He are co-first authors.

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Supplementary Figure S1

The schematic diagram shows the four consecutive stages in the development of the coated ePTFE grafts (TIFF 1317 kb)

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Chen, L., He, H., Wang, M. et al. Surface Coating of Polytetrafluoroethylene with Extracellular Matrix and Anti-CD34 Antibodies Facilitates Endothelialization and Inhibits Platelet Adhesion Under Sheer Stress. Tissue Eng Regen Med 14, 359–370 (2017). https://doi.org/10.1007/s13770-017-0044-3

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