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Functionalized silk fibers from transgenic silkworms for wound healing applications: Surface presentation of bioactive epidermal growth factor.
Journal of Biomedical Materials Research. Part A 2018 October
Growth factors play a crucial role in wound healing in general and are promising tools for the treatment of chronic wounds as they can restore the physiological wound healing process. In growth factor-loaded wound dressings, human epidermal growth factor (EGF) is released in a burst and washed out quickly. The developed matrix consists of recombinant EGF produced in transgenic silkworms as a fusion protein with the fibroin light chain. The covalent linkage prevents EGF from draining into the surrounding tissue while presenting the growth factor on the surface. EGF-functionalized silk membranes and nonwovens lead to a 2.5-fold increase in the cell number of fibroblasts, while retaining full bioactivity even after e-beam sterilization. EGF is long-term presented without burst release and significantly reduces the wound area by 15% in an in vitro wound model. Hence, the cost-effective production of a biomaterial using transgenic silkworm larvae in combination with a growth factor paves the way for a promising new multifactorial wound cover for chronic wound healing. © 2018 Wiley Periodicals, Inc. J Biomed Mater Res Part A: 106A: 2643-2652, 2018.
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