Sustained delivery of NT-3 and curcumin augments microenvironment modulation effects of decellularized spinal cord matrix hydrogel for spinal cord injury repair

Abstract Decellularized extracellular matrix hydrogel, especially that derived from spinal cord (DSCM hydrogel), has been actively considered as a functional biomaterial for remodeling the extracellular matrix of the native tissue, due to its unique characteristics in constructing pro-regenerative microenvironment for neural stem cells (NSCs). Furthermore, DSCM hydrogel can provide multiple binding domains to growth factors and drugs. Therefore, both exogenous neurotrophic factors and anti-inflammatory drugs are highly desired to be incorporated into DSCM hydrogel, which may synergistically modulate the complex microenvironment at the lesion site after spinal cord injury (SCI). Herein, neurotrophin-3 (NT-3) and curcumin (Cur) were integrated into DSCM hydrogel for SCI therapy. Due to different affinities to the DSCM hydrogel, NT-3 underwent a controlled release manner, while curcumin released explosively within the first 24 h, followed by rather sustained but slower release. The integration of both NT-3 and curcumin significantly enhanced NSCs proliferation and their neuronal differentiation. Meanwhile, the release of curcumin promoted macrophages polarization into anti-inflammatory subtypes, which further facilitated NSCs differentiation into neurons. The in situ injected DSCM + NT3 + Cur hydrogel exerted superior capability in alleviating the inflammatory responses in rat contused spinal cord. Compared to DSCM hydrogel alone, DSCM + NT3 + Cur hydrogel more significantly promoted the recruitment of NSCs and their neuronal differentiation at the lesion site. These outcomes favored functional recovery, as evidenced by the improved hind limb movement. Overall, the bioactive DSCM hydrogel can serve as a multifunctional carrier for cooperatively release of growth factors and drugs, which significantly benefits microenvironment regulation and nerve regeneration after SCI.

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