The effect of a recombinant elastin-mimetic coating of an ePTFE prosthesis on acute thrombogenicity in a baboon arteriovenous shunt.
A recombinant elastin-mimetic triblock protein polymer with an inverse transition temperature (approximately 20 degrees C) was used to impregnate small-diameter (4 mm i.d.) expanded polytetrafluoroethylene (ePTFE) vascular grafts. Scanning electron microscopy confirmed that initial elastin impregnation of the graft followed by further multilayer coating with elastin films filled in the fibril and node structure of the luminal surface of the ePTFE graft and was macroscopically smooth. Elastin protein polymer impregnation reduced the advancing contact angle of the luminal surface to 43 degrees, which was comparable to the advancing contact angle of 47 degrees for a cast elastin film. Attenuated total reflection infrared spectroscopy and Coomassie blue staining revealed little discernable change in the protein surface film after 24 h of shear at 500 s(-1) and 37 degrees C. Excellent short-term blood-contacting properties as determined by minimal fibrin and platelet deposition were demonstrated using a baboon extracorporeal femoral arteriovenous shunt model. The results of this study demonstrate the applicability of an elastin-mimetic triblock protein polymer as a non-thrombogenic coating or as a component of a tissue-engineered composite.
Jordan
Sumanas W
SW
Department of Surgery, Emory University, Atlanta, GA 30332, USA.
Haller
Carolyn A
CA
Sallach
Rory E
RE
Apkarian
Robert P
RP
Hanson
Stephen R
SR
Chaikof
Elliot L
EL
D000208:Acute Disease; D000818:Animals; D001166:Arteriovenous Shunt, Surgical / Q000009:adverse effects*; D001807:Blood Vessel Prosthesis / Q000009:adverse effects*; D020099:Coated Materials, Biocompatible / Q000008:administration & dosage / Q000737:chemistry; D004343:Drug Implants; D004549:Elastin / Q000008:administration & dosage* / Q000737:chemistry / Q000235:genetics; D019544:Equipment Failure Analysis; D008297:Male; D008422:Materials Testing; D010215:Papio; D011138:Polytetrafluoroethylene / Q000737:chemistry*; D011475:Prosthesis Failure; D011485:Protein Binding; D011994:Recombinant Proteins / Q000008:administration & dosage / Q000737:chemistry; D013927:Thrombosis / Q000209:etiology / Q000473:pathology* / Q000517:prevention & control*; D016896:Treatment Outcome
D020099:Coated Materials, Biocompatible; D004343:Drug Implants; D011994:Recombinant Proteins; D011138:Polytetrafluoroethylene; D004549:Elastin