Title:
Novel PEG-elastin copolymer for tissue engineered vascular grafts

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dc.contributor.advisor Taite, Lakeshia J.
dc.contributor.author Patel, Dhaval Pradipkumar en_US
dc.contributor.committeeMember Chaikof, Elliot
dc.contributor.committeeMember Garcia, Anes
dc.contributor.committeeMember McIntire, Larry
dc.contributor.committeeMember Sambanis, Athanassios
dc.contributor.department Chemical Engineering en_US
dc.date.accessioned 2013-01-17T21:21:02Z
dc.date.available 2013-01-17T21:21:02Z
dc.date.issued 2012-08-24 en_US
dc.description.abstract The growing incidences of coronary artery bypass graft surgeries have triggered a need to engineer a viable small diameter blood vessel substitute. An ideal tissue engineered vascular graft should mimic the microenvironment of a native blood vessel, while providing the adequate compliance post-implantation. Current vascular graft technologies lack the ability to promote vascular ECM deposition, leading to a compliance mismatch and ultimately, graft failure. Hence, in order to engineer suitable vascular grafts, this thesis describes the synthesis and characterization of novel elastin mimetic peptides, EM-19 and EM-23, capable of promoting vascular ECM deposition within a poly(ethylene glycol) diacrylate (PEG-DA) hydrogel. By combining the material properties of a synthetic and bio-inspired polymer, a suitable microenvironment for cell growth and ECM deposition can be engineered, leading to improved compliance. As such, characterization of EM-19 and EM-23 was conducted in human vascular smooth muscle cell (SMC) cultures, and the peptides self-assembled with a growing elastic matrix. After grafting the peptides onto the surface of PEG-DA hydrogels, EM-23 increased SMC adhesion by 6000% over PEG-RGDS hydrogels, which have been the gold standard of cell adhesive PEG scaffolds. Moreover, EM-23 grafted surfaces were able to promote elastin deposition that was comparable to tissue cultured polystyrene (TCPS) surface even though TCPS had roughly 4.5 times more SMCs adhered. Once translated to a 3D model, EM-23 also stimulated increased elastin deposition and improved the mechanical strength of the scaffold over time. Moreover, degradation studies suggested that EM-23 may serve as a template that not only promotes ECM deposition, but also allows ECM remodeling over time. The characterization studies in this thesis suggest that this peptide is an extremely promising candidate for improving vascular ECM deposition within a synthetic substrate, and that it may be beneficial to incorporate EM-23 within polymeric scaffolds to engineer compliant vascular grafts. en_US
dc.description.degree PhD en_US
dc.identifier.uri http://hdl.handle.net/1853/45811
dc.publisher Georgia Institute of Technology en_US
dc.subject Extracellular matrix en_US
dc.subject Elastin en_US
dc.subject Peptides en_US
dc.subject Hydrogels en_US
dc.subject.lcsh Tissue engineering
dc.subject.lcsh Biomedical engineering
dc.subject.lcsh Vascular grafts
dc.subject.lcsh Biopolymers
dc.subject.lcsh Synthetic biology
dc.subject.lcsh Bioengineering
dc.title Novel PEG-elastin copolymer for tissue engineered vascular grafts en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.corporatename School of Chemical and Biomolecular Engineering
local.contributor.corporatename College of Engineering
relation.isOrgUnitOfPublication 6cfa2dc6-c5bf-4f6b-99a2-57105d8f7a6f
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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