Regulates the NF-κB Signaling Pathway of Natural Stem Cells to Modulate Macrophage Migration during Spinal Cord Injury.

Neural stem cells (NSCs) play vital roles in the homeostasis of neurological function. Ubiquitously transcribed tetratricopeptide repeat, X chromosome (UTX) is an important regulator of stem cell phenotypes. In our current study, we aimed to investigate whether the conditional knockout of UTX on neural stem cells alters macrophage assembly in response to spinal cord injury (SCI). Conditional knockout of NSC (-KO) mice was used to generate SCI models by the modified Allen method. We reported that neurological function and scar hyperplasia significantly improved in -KO mice after SCI, accompanied by significantly reduced assembly of macrophages. With a 45-fold pathway array and Western blot, we found that -KO could significantly inhibit NF-κB signaling activation and promote the synthesis and secretion of macrophage migration inhibitory factor (MIF) in NSCs. Administration of the selective NF-κB p65 activator betulinic acid and the selective MIF inhibitor ISO-1 confirmed that the activation of NF-κB p65 phosphorylation or inhibition of MIF could eliminate the benefits of -KO in SCI, such as inhibition of macrophage aggregation and reduction in scar proliferation. This study confirmed that UTX in NSCs could alter macrophage migration and improve neurological function recovery after SCI in mice.