Abstract
Insufficient retention of endothelial cells to the luminal surface of small-diameter tissue engineered vascular grafts has precluded clinical translation. This study utilized a gene silencing strategy to enhance the adhesion strength of vascular endothelial cells to fibronectin-coated expanded polytetrafluoroethylene, a common vascular graft material. SHP-1 and SHP-2 are both phosphatases known to inhibit the formation of focal contacts. By employing siRNA to knockdown the expression of SHP-1 or SHP-2, we observed a significant improvement in cell retention following 6 h of pulsatile fluid shear stress. At an average fluid shear stress of 15 dyn/cm2, cell retention was improved from approximately 30% for control groups to approximately 70 and 85% for cells treated with SHP-1 and SHP-2 specific siRNA, respectively (n = 8 for all groups). We also observed that treatment with SHP-1 or SHP-2 specific siRNA caused a modest increase in focal contact density and did not cause a significant effect on the expression of the endothelial cell markers VEGFR-2, VE-cadherin, and PECAM-1. These findings indicate that molecular modulation may be an effective strategy for improving the retention of endothelial cells within tissue engineered vascular grafts, which may in turn improve their clinical performance.
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Bartlett, D. W., and M. E. Davis. Insights into the kinetics of siRNA-mediated gene silencing from live-cell and live-animal bioluminescent imaging. Nucleic Acids Res. 34:322–333, 2006.
Burridge, K., S. K. Sastry, and J. L. Sallee. Regulation of cell adhesion by protein-tyrosine phosphatases. I. Cell-matrix adhesion. J. Biol. Chem. 281:15593–15596, 2006.
Carpenter, A. E., T. R. Jones, M. R. Lamprecht, C. Clarke, I. H. Kang, O. Friman, D. A. Guertin, J. H. Chang, R. A. Lindquist, J. Moffat, P. Golland, and D. M. Sabatini. Cellprofiler: image analysis software for identifying and quantifying cell phenotypes. Genome Biol. 7:R100.101–R100.111, 2006.
Carr, H. M., R. Vohra, H. Sharma, J. V. Smyth, O. B. Rooney, P. D. Dodd, and M. G. Walker. Endothelial cell seeding kinetics under chronic flow in prosthetic grafts. Ann. Vasc. Surg. 10:469–475, 1996.
Chlupac, J., E. Filova, T. Riedel, M. Houska, E. Brynda, M. Remy-Zolghadri, R. Bareille, P. Fernandez, R. Daculsi, C. Bourget, L. Bordenave, and L. Bacakova. Attachment of human endothelial cells to polyester vascular grafts: pre-coating with adhesive protein assemblies and resistance to short-term shear stress. Physiol. Res. 63:167–177, 2014.
Chong, Z. Z., and K. Maiese. The src homology 2 domain tyrosine phosphatases shp-1 and shp-2: diversified control of cell growth, inflammation, and injury. Histol. Histopathol. 22:1251–1267, 2007.
Daxini, S. C., J. W. Nichol, A. L. Sieminski, G. Smith, K. J. Gooch, and V. P. Shastri. Micropatterned polymer surfaces improve retention of endothelial cells exposed to flow-induced shear stress. Biorheology 43:45–55, 2006.
De Visscher, G., L. Mesure, B. Meuris, A. Ivanova, and W. Flameng. Improved endothelialization and reduced thrombosis by coating a synthetic vascular graft with fibronectin and stem cell homing factor SDF-1alpha. Acta Biomater. 8:1330–1338, 2012.
Edgell, C. J., C. C. McDonald, and J. B. Graham. Permanent cell line expressing human factor VIII-related antigen established by hybridization. Proc. Natl. Acad. Sci. USA 80:3734–3737, 1983.
Fahmy, R. G., and L. M. Khachigian. Suppression of growth factor expression and human vascular smooth muscle cell growth by small interfering RNA targeting EGR-1. J. Cell. Biochem. 100:1526–1535, 2007.
Fire, A., S. Xu, M. K. Montgomery, S. A. Kostas, S. E. Driver, and C. C. Mello. Potent and specific genetic interference by double-stranded RNA in caenorhabditis elegans. Nature 391:806–811, 1998.
Herring, M. B. Endothelial cell seeding. J. Vasc. Surg. 13:731–732, 1991.
Herring, M., A. Gardner, and J. Glover. A single-staged technique for seeding vascular grafts with autogenous endothelium. Surgery 84:498–504, 1978.
Inagaki, K., T. Noguchi, T. Matozaki, T. Horikawa, K. Fukunaga, M. Tsuda, M. Ichihashi, and M. Kasuga. Roles for the protein tyrosine phosphatase SHP-2 in cytoskeletal organization, cell adhesion and cell migration revealed by overexpression of a dominant negative mutant. Oncogene 19:75–84, 2000.
Kader, K. N., R. Akella, N. P. Ziats, L. A. Lakey, H. Harasaki, J. P. Ranieri, and R. V. Bellamkonda. eNOS-overexpressing endothelial cells inhibit platelet aggregation and smooth muscle cell proliferation in vitro. Tissue Eng. 6:241–251, 2000.
Kesler, K. A., M. B. Herring, M. P. Arnold, J. L. Glover, H. M. Park, M. N. Helmus, and P. J. Bendick. Enhanced strength of endothelial attachment on polyester elastomer and polytetrafluoroethylene graft surfaces with fibronectin substrate. J. Vasc. Surg. 3:58–64, 1986.
Kurobe, H., M. W. Maxfield, C. K. Breuer, and T. Shinoka. Concise review: tissue-engineered vascular grafts for cardiac surgery: past, present, and future. Stem Cells Transl. Med. 1:566–571, 2012.
Lin, S. Y., S. Raval, Z. Zhang, M. Deverill, K. A. Siminovitch, D. R. Branch, and B. Haimovich. The protein-tyrosine phosphatase SHP-1 regulates the phosphorylation of alpha-actinin. J. Biol. Chem. 279:25755–25764, 2004.
Liu, S. Q., P. K. Alkema, C. Tieche, B. J. Tefft, D. Z. Liu, Y. C. Li, B. E. Sumpio, J. A. Caprini, and M. Paniagua. Negative regulation of monocyte adhesion to arterial elastic laminae by signal regulatory protein alpha and src homology 2 domain-containing protein-tyrosine phosphatase-1. J. Biol. Chem. 280:39294–39301, 2005.
Meinhart, J. G., J. C. Schense, H. Schima, M. Gorlitzer, J. A. Hubbell, M. Deutsch, and P. Zilla. Enhanced endothelial cell retention on shear-stressed synthetic vascular grafts precoated with RGD-cross-linked fibrin. Tissue Eng. 11:887–895, 2005.
Nishibe, T., Y. Kondo, A. Muto, and A. Dardik. Optimal prosthetic graft design for small diameter vascular grafts. Vascular 15:356–360, 2007.
Nolte, A., C. Raabe, T. Walker, P. Simon, G. Ziemer, and H. P. Wendel. Optimized basic conditions are essential for successful siRNA transfection into primary endothelial cells. Oligonucleotides 19:141–150, 2009.
Preis, M., T. Cohen, Y. Sarnatzki, Y. Ben Yosef, J. Schneiderman, Z. Gluzman, B. Koren, B. S. Lewis, Y. Shaul, and M. Y. Flugelman. Effects of fibulin-5 on attachment, adhesion, and proliferation of primary human endothelial cells. Biochem. Biophys. Res. Commun. 348:1024–1033, 2006.
Ramalanjaona, G., R. F. Kempczinski, J. E. Rosenman, E. C. Douville, and E. B. Silberstein. The effect of fibronectin coating on endothelial cell kinetics in polytetrafluoroethylene grafts. J. Vasc. Surg. 3:264–272, 1986.
Ravi, S., and E. L. Chaikof. Biomaterials for vascular tissue engineering. Regen. Med. 5:107–120, 2010.
Roach, T. I., S. E. Slater, L. S. White, X. Zhang, P. W. Majerus, E. J. Brown, and M. L. Thomas. The protein tyrosine phosphatase SHP-1 regulates integrin-mediated adhesion of macrophages. Curr. Biol. 8:1035–1038, 1998.
Tajima, S., J. S. F. Chu, S. Li, and K. Komvopoulos. Differential regulation of endothelial cell adhesion, spreading, and cytoskeleton on low-density polyethylene by nanotopography and surface chemistry modification induced by argon plasma treatment. J. Biomed. Mater. Res. A 84A:828–836, 2008.
Tefft, B. J., A. M. Kopacz, W. K. Liu, and S. Q. Liu. Enhancing endothelial cell retention on ePTFE constructs by siRNA-mediated SHP-1 gene silencing. J. Nanotechnol. Eng. Med. 2:0110071–0110076, 2011.
Tefft, B. J., A. M. Kopacz, W. K. Liu, and S. Q. Liu. Experimental and computational validation of hele-shaw stagnation flow with varying shear stress. Comput. Mech. 52:1463–1473, 2013.
Truskey, G. A., and J. S. Pirone. The effect of fluid shear stress upon cell adhesion to fibronectin-treated surfaces. J. Biomed. Mater. Res. 24:1333–1353, 1990.
Tzima, E., M. A. del Pozo, S. J. Shattil, S. Chien, and M. A. Schwartz. Activation of integrins in endothelial cells by fluid shear stress mediates rho-dependent cytoskeletal alignment. EMBO J. 20:4639–4647, 2001.
Xu, Q., Z. Zhang, F. Davison, and Y. Hu. Circulating progenitor cells regenerate endothelium of vein graft atherosclerosis, which is diminished in ApoE-deficient mice. Circ. Res. 93:e76–e86, 2003.
Xue, L., and H. P. Greisler. Biomaterials in the development and future of vascular grafts. J. Vasc. Surg. 37:472–480, 2003.
Yazdani, S. K., B. W. Tillman, J. L. Berry, S. Soker, and R. L. Geary. The fate of an endothelium layer after preconditioning. J. Vasc. Surg. 51:174–183, 2010.
Yu, D. H., C. K. Qu, O. Henegariu, X. Lu, and G. S. Feng. Protein-tyrosine phosphatase SHP-2 regulates cell spreading, migration, and focal adhesion. J. Biol. Chem. 273:21125–21131, 1998.
Zarbiv, G., M. Preis, Y. Ben-Yosef, and M. Y. Flugelman. Engineering blood vessels by gene and cell therapy. Expert Opin. Biol. Ther. 7:1183–1191, 2007.
Acknowledgments
The authors gratefully acknowledge Raga Siddharthan for assistance with flow cytometry studies and Monica Beam for assistance with western blot studies. This work was supported by the National Science Foundation (0401781, 0856333, and the Graduate Research Fellowship Program) and the American Heart Association (9940033N and 0550164Z). WKL was partially supported by the World Class University Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science, and Technology (R33-10079).
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Brandon J. Tefft, Adrian M. Kopacz, Wing Kam Liu, and Shu Q. Liu declare that they have no conflicts of interest.
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Associate Editor Martin L Yarmush oversaw the review of this article.
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Tefft, B.J., Kopacz, A.M., Liu, W.K. et al. Enhancement of Endothelial Cell Retention on ePTFE Vascular Constructs by siRNA-Mediated SHP-1 or SHP-2 Gene Silencing. Cel. Mol. Bioeng. 8, 507–516 (2015). https://doi.org/10.1007/s12195-015-0392-9
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DOI: https://doi.org/10.1007/s12195-015-0392-9