Vascular prostheses with controlled release of antibiotics -: Part 2.: In vitro biological evaluation of vascular prostheses treated by cyclodextrins

Viability tests by the colony forming method show no toxicity for all CDs (P-CD, gamma-CD, HP beta-CD and HP gamma-CD) and their associated polymer. A survival rate of 100% is observed for all CDs at high concentration 400 ppm. Proliferation tests revealed a low proliferation of L 132 cells on grafted vascular prostheses and untreated prostheses and good proliferation on Melinexo (R) (film form of PET). A proliferation of 17% is observed after 3 days of incubation and decrease at 4% after 6 days on prostheses. Melinex (R) exhibits a proliferation rate as the controls. Vitality tests confirm proliferation tests and show a good vitality of cells even for low cell amounts. From these experiments it becomes obvious that the decreasing proliferation rate is not a cytotoxic effect but is due to the chemical and/or physical surface characteristics. A similar result is obtained for cell adhesion kinetics between grafted vascular prostheses and control. After 2 h adhesion, a lower adhesion is observed on untreated prostheses. Theses results were confirmed by immunochemistry and morphology tests. This cell adhesion inhibiting effect of the PET prostheses contributes to a better "survival" of vascular prostheses without secondary obstruction or stenosis. (c) 2006 Elsevier B.V. All rights reserved.