{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,5]],"date-time":"2026-03-05T22:08:36Z","timestamp":1772748516436,"version":"3.50.1"},"reference-count":83,"publisher":"Ovid Technologies (Wolters Kluwer Health)","issue":"6","content-domain":{"domain":["lww.com","ovid.com"],"crossmark-restriction":true},"short-container-title":["Pain","PAIN"],"published-print":{"date-parts":[[2021,6]]},"abstract":"<jats:title>Abstract<\/jats:title>\n          <jats:p>It remains unknown why on similar acute\/subacute painful conditions, pain persists in some individuals while in others it resolves. Genetic factors, mood, and functional alterations, particularly involving the mesolimbic network, seem to be key. To explore potential susceptibility or resistance factors, we screened a large population of rats with a peripheral neuropathy and we isolated a small subset (&lt;15%) that presented high thresholds (HTs) to mechanical allodynia (reduced pain manifestation). The phenotype was sustained over 12 weeks and was associated with higher hedonic behavior when compared with low-threshold (LT) subjects. The nucleus accumbens of HT and LT animals were isolated for proteomic analysis by Sequential Window Acquisition of All Theoretical Mass Spectra. Two hundred seventy-nine proteins displayed different expression between LT and HT animals or subjects. Among several protein families, the proteasome pathway repeatedly emerged in gene ontology enrichment and KEGG analyses. Several alpha and beta 20S proteasome subunits were increased in LT animals when compared with HT animals (eg, PSM\u03b11, PSM\u03b12, and PSM\u03b25). On the contrary, UBA6, an upstream ubiquitin-activating enzyme, was decreased in LT animals. Altogether these observations are consistent with an overactivation of the accumbal proteasome pathway in animals that manifest pain and depressive-like behaviors after a neuropathic injury. All the proteomic data are available through ProteomeXchange with identifier PXD022478.<\/jats:p>","DOI":"10.1097\/j.pain.0000000000002192","type":"journal-article","created":{"date-parts":[[2021,1,14]],"date-time":"2021-01-14T20:17:08Z","timestamp":1610655428000},"page":"1722-1731","update-policy":"https:\/\/doi.org\/10.1097\/lww.0000000000001000","source":"Crossref","is-referenced-by-count":12,"title":["Chronic pain susceptibility is associated with anhedonic behavior and alterations in the accumbal ubiquitin-proteasome system"],"prefix":"10.1097","volume":"162","author":[{"given":"Marco Rafael","family":"Guimar\u00e3es","sequence":"first","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, Portugal"}]},{"given":"Sandra Isabel","family":"Anjo","sequence":"additional","affiliation":[{"name":"CNC\u2014Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal"},{"name":"Faculty of Medicine, University of Coimbra, Coimbra, Portugal"}]},{"given":"Ana Margarida","family":"Cunha","sequence":"additional","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, Portugal"}]},{"given":"Madalena","family":"Esteves","sequence":"additional","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, Portugal"}]},{"given":"Nuno","family":"Sousa","sequence":"additional","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, Portugal"}]},{"given":"Armando","family":"Almeida","sequence":"additional","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, Portugal"}]},{"given":"Bruno","family":"Manadas","sequence":"additional","affiliation":[{"name":"CNC\u2014Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal"}]},{"given":"Hugo","family":"Leite-Almeida","sequence":"additional","affiliation":[{"name":"Life and Health Sciences Research Institute (ICVS), School of Medicine, University of Minho, Braga, Portugal"},{"name":"ICVS\/3B's\u2014PT Government Associate Laboratory, Braga\/Guimar\u00e3es, 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