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In both rat and human samples, we observed a significant increase in cerebrospinal fluid (CSF)-derived extracellular vesicle (EV) miR-9-3p after SCI, prompting further investigation into its role. In a rat model, miR-9-3p levels were significantly lower at the injured spinal levels but higher in the motor cortex, where astrocytes showed the highest expression. Functional analyses revealed that miR-9-3p regulates energy metabolism, immune activity, and oxidative stress in neurons, inducing transcriptional changes suggestive of stress adaptation and synaptic remodeling. 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