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imagePeripheral nerve gap injuries continue to present a clinical challenge to today’s surgeons. One method of surgical repair, implantation of acellular allografts, has been developed with the aim of bridging the gap with a cadaveric graft after removal of its cellular components, thereby accelerating axonal regeneration and eliminating the need for immunosuppression in recipient patients. Although decellularizing allografts reduces rates of graft rejection, the same chemical processing modifies the neural microenvironment, removing neutrotrophic factors and modifying the complex extracellular matrix. In this study, we explore 3 common methods for producing acellular allografts. Extracellular matrix content remaining after processing was investigated and was found to be highly dependent on the decellularization method. In addition, scanning electron micrographs were obtained to evaluate the structural effects of the decellularization methods. Though the content and structure of these processed allografts will contribute to their effectiveness as nerve gap repair candidates, we demonstrate that it also affects their capacity to be supplemented/preloaded with the prototypical neurotrophin, nerve growth factor (NGF), essential to neuronal regeneration. Although all allografts had some capacity for retaining NGF in the first 24 hours, only Sondell-processed grafts retained NGF over the entire experimental period of 21 days. Future studies will include validating these processed and supplemented allografts as viable alternatives to traditional autograft nerve gap repair.

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