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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Microfabricated microporous membranes reduce the host immune response and prolong the functional lifetime of a closed-loop insulin delivery implant in a type 1 diabetic rat model.
Biomaterials 47, 51-61 (2015)
Implantation of a medical implant within the body inevitably triggers a host inflammatory response that negatively impacts its function and longevity. Nevertheless, the degree and severity of this response may be reduced by selecting appropriate materials, implant geometry, surface topography and surface treatment. Here we demonstrate a strategy to improve the biocompatibility of a chemically-driven closed-loop insulin delivery implant. A microfabricated microporous, poly(ethylene glycol)-grafted polydimethylsiloxane membrane was placed on top of the glucose-responsive insulin release plug of the implant. Implant biocompatibility was assessed in healthy rats while implant function was evaluated in a type 1 diabetic rat model. The microporous membrane with a small distance to the plug provided a geometric barrier to inflammatory cell migration and prevented leukocyte-mediated degradation of the plug for at least 30 days. Membrane-protected devices elicited a significantly milder inflammatory response and formation of a well-defined fibrous capsule at the device opening compared to unprotected devices. The device's glucose-responsiveness was nearly unchanged, although the insulin release rate decreased with decreasing pore size. The microporous membrane improved biocompatibility and prolonged in vivo efficacy of the implant by ∼3-fold. This work suggests the importance of implant design in modulating inflammatory response and thereby extending the functional duration of the implant.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Biocompatibility ; Closed-loop Insulin Delivery Implant ; Diabetes ; Drug Delivery Implant ; Microfabrication ; Microporous Membrane
ISSN (print) / ISBN
0142-9612
e-ISSN
1878-5905
Zeitschrift
Biomaterials
Quellenangaben
Band: 47,
Seiten: 51-61
Verlag
Elsevier
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Medicinal Chemistry (IMC)