Hydrogel surfaces to promote attachment and spreading of endothelial progenitor cells.
Endothelialization of artificial vascular grafts is a challenging process in cardiovascular tissue engineering. Functionalized biomaterials could be promising candidates to promote endothelialization in repair of cardiovascular injuries. The purpose of this study was to synthesize hyaluronic acid (HA) and heparin-based hydrogels that could promote adhesion and spreading of endothelial progenitor cells (EPCs). We report that the addition of heparin into HA-based hydrogels provides an attractive surface for EPCs promoting spreading and the formation of an endothelial monolayer on the hydrogel surface. To increase EPC adhesion and spreading, we covalently immobilized CD34 antibody (Ab) on HA-heparin hydrogels, using standard EDC/NHS amine-coupling strategies. We found that EPC adhesion and spreading on CD34 Ab-immobilized HA-heparin hydrogels was significantly higher than their non-modified analogues. Once adhered, EPCs spread and formed an endothelial layer on both non-modified and CD34 Ab-modified HA-heparin hydrogels after 3 days of culture. We did not observe significant adhesion and spreading when heparin was not included in the control hydrogels. In addition to EPCs, we also used human umbilical cord vein endothelial cells (HUVECs), which adhered and spread on HA-heparin hydrogels. Macrophages exhibited significantly less adhesion compared to EPCs on the same hydrogels. This composite material could possibly be used to develop surface coatings for artificial cardiovascular implants, due to its specificity for EPC and endothelial cells on an otherwise non-thrombogenic surface.
Center for Biomedical Engineering, Department of Medicine, Brigham and Women's Hospital, Harvard Medical School, Cambridge, MA 02139, USA.
Gulden
G
Camci-Unal
Jason William
JW
Nichol
Hojae
H
Bae
Halil
H
Tekin
Joyce
J
Bischoff
Ali
A
Khademhosseini
D000906:Antibodies / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects; D002465:Cell Movement / Q000187:drug effects; D048430:Cell Shape / Q000187:drug effects; D003432:Cross-Linking Reagents / Q000494:pharmacology; D042783:Endothelial Cells / Q000166:cytology*; D006801:Humans; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate / Q000737:chemistry / Q000494:pharmacology*; D055767:Immobilized Proteins / Q000494:pharmacology; D008264:Macrophages / Q000166:cytology / Q000187:drug effects; D013234:Stem Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D013499:Surface Properties; D013997:Time Factors
D000906:Antibodies; D003432:Cross-Linking Reagents; D055767:Immobilized Proteins; D020136:Hydrogel, Polyethylene Glycol Dimethacrylate