[No authors listed]
Reactive oxygen species contribute to tissue damage and remodelling mediated by the inflammatory response after injury. Here we show that which promote axonal dieback and degeneration after injury, are also required for axonal regeneration and functional recovery after spinal injury. We find that production in the injured sciatic nerve and dorsal root ganglia requires CX3CR1-dependent recruitment of inflammatory cells. Next, exosomes containing functional NADPH oxidase 2 complexes are released from macrophages and incorporated into injured axons via endocytosis. Once in axonal endosomes, active NOX2 is retrogradely transported to the cell body through an importin-β1-dynein-dependent mechanism. Endosomal NOX2 oxidizes PTEN, which leads to its inactivation, thus stimulating PI3K-phosporylated (p-)Akt signalling and regenerative outgrowth. Challenging the view that duanyu1670 are exclusively involved in nerve degeneration, we propose a previously unrecognized role of duanyu1670 in mammalian axonal regeneration through a NOX2-PI3K-p-Akt signalling pathway.
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