Thermoreversible laminin-functionalized hydrogel for neural tissue engineering |
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Authors: | Stabenfeldt Sarah E García Andrés J LaPlaca Michelle C |
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Affiliation: | Laboratory for Neuroengineering, W.H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology/Emory University, Atlanta, 30332-0535, USA. |
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Abstract: | Traumatic injury to the central nervous system (CNS) triggers cell death and deafferentation, which may activate a cascade of cellular and network disturbances. These events often result in the formation of irregularly shaped lesions comprised of necrotic tissue and/or a fluid-filled cavity. Tissue engineering represents a promising treatment strategy for the injured neural tissue. To facilitate minimally invasive delivery of a tissue engineered system, a thermoreversible polymer is an attractive scaffold candidate. We have developed a bioactive scaffold for neural tissue engineering by tethering laminin-1 (LN) to methylcellulose (MC), a thermoresponsive hydrogel. The base MC chain was oxidized via sodium m-periodate to increase MC tethering capacity. Protein immobilization was facilitated by a Schiff base reaction between primary amine groups on LN and the carbonyl groups of the oxidized MC chain. Immunoassays demonstrated tethering of LN at 1.6 +/- 0.5 ng of LN per milligram of MC. Rheological measurements for different MC-LN constructs indicated MC composition- and MC treatment-dependent effects on solution-gelation transition temperature. Cellular assays with primary rat cortical neurons demonstrated enhanced cell adhesion and viability on LN-functionalized MC when compared with base and oxidized MC. This bioadhesive thermoresponsive scaffold may provide a robust delivery vehicle to injured CNS tissue for neural cell transplantation strategies. |
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