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Chronic pain-related memory impairment has susceptible and unsusceptible features. Therefore, exploring the underlying mechanisms of its vulnerability is essential for developing effective treatments. Here, combining two spatial memory tests (Y-maze test and Morris water maze), we segregated chronic pain mice into memory impairment-susceptible and -unsusceptible subpopulations in a chronic neuropathic pain model induced by chronic constrictive injury of the sciatic nerve. RNA-Seq analysis and gain\/loss-of-function study revealed that S1P\/S1PR1 signaling is a determinant for vulnerability to chronic pain-related memory impairment. Knockdown of the S1PR1 in the dentate gyrus (DG) promoted a susceptible phenotype and led to structural plasticity changes of reduced excitatory synapse formation and abnormal spine morphology as observed in susceptible mice, while overexpression of the S1PR1 and pharmacological administration of S1PR1 agonist in the DG promoted an unsusceptible phenotype and prevented the occurrence of memory impairment, and rescued the morphological abnormality. Finally, the Gene Ontology (GO) enrichment analysis and biochemical evidence indicated that downregulation of S1PR1 in susceptible mice may impair DG structural plasticity via interaction with actin cytoskeleton rearrangement-related signaling pathways including Itga2 and its downstream Rac1\/Cdc42 signaling and Arp2\/3 cascade. These results reveal a novel mechanism and provide a promising preventive and therapeutic molecular target for vulnerability to chronic pain-related memory impairment.<\/jats:p>","DOI":"10.7554\/elife.99862","type":"journal-article","created":{"date-parts":[[2024,7,16]],"date-time":"2024-07-16T14:25:27Z","timestamp":1721139927000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.99862","source":"Crossref","is-referenced-by-count":4,"title":["Dysfunctional S1P\/S1PR1 signaling in the dentate gyrus drives vulnerability of chronic pain-related memory impairment"],"prefix":"10.7554","volume":"13","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7098-8718","authenticated-orcid":true,"given":"Mengqiao","family":"Cui","sequence":"first","affiliation":[{"name":"Jiangsu Province Key Laboratory of Anesthesiology, Xuzhou Medical University","place":["Xuzhou, China"]},{"name":"NMPA Key Laboratory for Research and Evaluation of Narcotic and Psychotropic Drugs, Xuzhou Medical 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