Abstract
Neuroinflammation plays an important role in secondary injury after spinal cord injury (SCI) and may aggravate neurological dysfunction. Several studies have indicated that sodium houttuyfonate (SH) can significantly inhibit macrophage- mediated inflammation; however, its effects on SCI still needs to be elucidated. We found that SH improved Basso, Beattie, and Bresnahan scores and performance in the inclined plane test of SCI model rats. The injured spinal cord exhibited less neuronal loss, cell apoptosis, and M1 microglial polarization after SH treatment. In vitro, SH reduced TLR4/NF-κB expression in cultured primary microglia and decreased M1 microglial polarization and cell apoptosis in a lipopolysaccharide (LPS)-pretreated microglia and neuron coculture system. These results indicated that SH may exert a neuroprotective effect by inhibiting M1 microglial polarization after SCI via the TLR4/NF-κB signalling pathway.
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