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Merging bioresponsive release of insulin-like growth factor I with 3D printable thermogelling hydrogelsBeudert, Matthias; Hahn, Lukas; Horn, Anselm H.C.; Hauptstein, Niklas; Sticht, Heinrich; Meinel, Lorenz; Luxenhofer, Robert; Gutmann, Marcus; Lühmann, Tessa (2022-07-01)3D printing of biomaterials enables spatial control of drug incorporation during automated manufacturing. This study links bioresponsive release of the anabolic biologic, insulin-like growth factor-I (IGF-I) in response to matrix metalloproteinases (MMP) to 3D printing using the block copolymer of poly(2-methyl-2-oxazoline) and thermoresponsive poly(2-n-propyl-2-oxazine) (POx-b-POzi). For that, a chemo-enzymatic synthesis was deployed, ligating IGF-I enzymatically to a protease sensitive linker (PSL), which was conjugated to a POx-b-POzi copolymer. The product was blended with the plain thermogelling POx-b-POzi hydrogel. MMP exposure of the resulting hydrogel triggered bioactive IGF-I release. The bioresponsive IGF-I containing POx-b-POzi hydrogel system was further detailed for shape control and localized incorporation of IGF-I via extrusion 3D printing for future applications in biomedicine and biofabrication. © 2022 Elsevier B.V.