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Nrf2 Inhibits GAPDH/Siah1 Axis to Reduce Inflammatory Reactions and Proliferation of Microglia After Simulating Spinal Cord Injury


Chunhe Sha, Feng Pan, Zhiqing Wang, Guohui Liu, Hua Wang, Tianwei Huang and Kai Huang*   Pages 1 - 9 ( 9 )


Objective: To explore the effect of nuclear factor erythroid 2-related factor 2 (Nrf 2) on microglial inflammatory response and proliferation after spinal cord injury (SCI) through the glyceraldehyde phosphate dehydrogenase (GAPDH) / Seven in absentia homolog 1 (Siah 1) signaling pathway. <p> Methods: Human microglia HMC3 was induced by lipopolysaccharide (LPS) to establish a SCI cell model. Microglia morphology after LPS stimulation was observed by transmission electron microscope (TEM), and cellular Nrf2, GAPDH/Siah1 pathway expression and cell viability were determined. Subsequently, the Nrf2 overexpression plasmid was transfected into microglia to observe changes in cell viability and GAPDH/Siah1 pathway expression. <p> Results: Microglia, mostly amoeba-like, were found to have enlarged cell bodies after LPS stimulation, with an increased number of cell branches, highly expressed Nrf2, GAPDH and Siah1, and decreased cell viability (P<0.05). Up-regulating Nrf2 inhibited the GAPDH/Siah1 axis, decreased inflammatory responses, and enhanced activity in post-SCI microglia (P<0.05). <p> Conclusion: Up-regulating Nrf2 expression can reverse the inflammatory reaction of microglia after LPS stimulation and enhance their activity by inhibiting the GAPDH/Siah1 axis.


Nrf2 inhibits GAPDH/Siah1 signaling pathways, spinal cord injury, microglia, inflammatory reactions.


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