TY  - JOUR
A1  - Radakovic, D.
A1  - Reboredo, J.
A1  - Helm, M.
A1  - Weigel, T.
A1  - Schürlein, S.
A1  - Kupczyk, E.
A1  - Leyh, R. G.
A1  - Walles, H.
A1  - Hansmann, J.
T1  - A multilayered electrospun graft as vascular access for hemodialysis
JF  - PLoS ONE
N2  - Despite medical achievements, the number of patients with end-stage kidney disease keeps steadily raising, thereby entailing a high number of surgical and interventional procedures to establish and maintain arteriovenous vascular access for hemodialysis. Due to vascular disease, aneurysms or infection, the preferred access—an autogenous arteriovenous fistula—is not always available and appropriate. Moreover, when replacing small diameter blood vessels, synthetic vascular grafts possess well-known disadvantages. A continuous multilayered gradient electrospinning was used to produce vascular grafts made of collagen type I nanofibers on luminal and adventitial graft side, and poly-ɛ-caprolactone as medial layer. Therefore, a custom-made electrospinner with robust environmental control was developed. The morphology of electrospun grafts was characterized by scanning electron microscopy and measurement of mechanical properties. Human microvascular endothelial cells were cultured in the graft under static culture conditions and compared to cultures obtained from dynamic continuous flow bioreactors. Immunofluorescent analysis showed that endothelial cells form a continuous luminal layer and functional characteristics were confirmed by uptake of acetylated low-density-lipoprotein. Incorporation of vancomycin and gentamicin to the medial graft layer allowed antimicrobial inhibition without exhibiting an adverse impact on cell viability. Most striking a physiological hemocompatibility was achieved for the multilayered grafts.
KW  - collagens
KW  - polymers
KW  - vascular surgery
KW  - endothelial cells
KW  - cell cultures
KW  - blood
KW  - antibiotics
KW  - scanning electron microscopy
Y1  - 2017
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-159102
VL  - 12
IS  - 10
ER  -