Optics express · 2022
Creating perfect composite vortex beams with a single all-dielectric geometric metasurface.
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Liu Yishu, Liu Jingsong, Wang Yangyang, Zhang Yubo, Peng Zhibin, Li Pengfei, Li Mi, Xue Bing, Wang Yansong
Аннотация
INTRODUCTION: Spinal cord injury (SCI) is a severe neurological condition with limited treatment options. Polylactic acid (PLA)+graphene oxide (GO)+anti-TNF-α (Ab) composites have shown potential in regulating immune responses and promoting neural repair.
METHODS: Electrospinning PLA+GO+Ab materials were characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD). Their effects on neural stem cells (NSCs) and macrophage polarization were evaluated through in vitro assays, including proliferation, migration, differentiation, and flow cytometry. A rat SCI model was used to assess motor function recovery and histological changes.
RESULTS: PLA+GO+Ab promoted NSC proliferation, migration, and differentiation while inducing macrophage polarization toward the M2 phenotype, reducing inflammation. In the SCI model, PLA+GO+Ab treatment enhanced motor function recovery, reduced spinal cord damage, and promoted axonal regeneration and oligodendrocyte maturation. RNA sequencing identified activation of the Rap1 signaling pathway, contributing to these effects.
DISCUSSION: PLA+GO+Ab composites effectively modulate the neuroimmune microenvironment, supporting SCI recovery by promoting neural repair and immune regulation. These findings suggest its potential as a therapeutic biomaterial for SCI treatment.
METHODS: Electrospinning PLA+GO+Ab materials were characterized using scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and X-ray diffraction (XRD). Their effects on neural stem cells (NSCs) and macrophage polarization were evaluated through in vitro assays, including proliferation, migration, differentiation, and flow cytometry. A rat SCI model was used to assess motor function recovery and histological changes.
RESULTS: PLA+GO+Ab promoted NSC proliferation, migration, and differentiation while inducing macrophage polarization toward the M2 phenotype, reducing inflammation. In the SCI model, PLA+GO+Ab treatment enhanced motor function recovery, reduced spinal cord damage, and promoted axonal regeneration and oligodendrocyte maturation. RNA sequencing identified activation of the Rap1 signaling pathway, contributing to these effects.
DISCUSSION: PLA+GO+Ab composites effectively modulate the neuroimmune microenvironment, supporting SCI recovery by promoting neural repair and immune regulation. These findings suggest its potential as a therapeutic biomaterial for SCI treatment.