Abstract
Chemotropic proteins guide neuronal projections to their final target during embryo development and are useful to guide axons of neurons used in transplantation therapies. Site-specific delivery of the proteins however is needed for their application in the brain to avoid degradation and pleiotropic affects. In the present study we report the use of Poly (ethylene glycol)-Silica (PEG-Si) nanocomposite gel with thixotropic properties that make it injectable and suitable for delivery of the chemotropic protein semaphorin 3A. PEG-Si gel forms a functional gradient of semaphorin that enhances axon outgrowth of dopaminergic neurons from rat embryos or differentiated from stem cells in culture. It is not cytotoxic and its properties allowed its injection into the striatum without inflammatory response in the short term. Long term implantation however led to an increase in macrophages and glial cells. The inflammatory response could have resulted from non-degraded silica particles, as observed in biodegradation assays.
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Acknowledgments
We thank to Fabian Diaz, Emmanuel Diaz-Martinez, Soledad Mendoza, Elsa Nydia Hernández, and Martín García-Servín for their technical support. We also thank Dororthy Pless for editing the manuscript style. This work was supported by National Council of Science and Technology of Mexico (CONACYT), grant number 82482; and National University of México (UNAM), grant DGAPA-UNAM IN217810-21 and IMPULSA02-UNAM (stem cell group).
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Tamariz, E., Wan, A.C.A., Pek, Y.S. et al. Delivery of chemotropic proteins and improvement of dopaminergic neuron outgrowth through a thixotropic hybrid nano-gel. J Mater Sci: Mater Med 22, 2097–2109 (2011). https://doi.org/10.1007/s10856-011-4385-5
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DOI: https://doi.org/10.1007/s10856-011-4385-5