{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,23]],"date-time":"2026-10-23T20:36:53Z","timestamp":1792787813855,"version":"4.5.0"},"reference-count":27,"publisher":"SAGE Publications","issue":"4","license":[{"start":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T00:00:00Z","timestamp":1775260800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"funder":[{"name":"National Institute on Drug Abuse","award":["DA009158"],"award-info":[{"award-number":["DA009158"]}],"id":[{"id":"https:\/\/ror.org\/00fq5cm18","id-type":"ROR","asserted-by":"crossref"}]},{"name":"National Institute on Drug Abuse","award":["DA047858"],"award-info":[{"award-number":["DA047858"]}],"id":[{"id":"https:\/\/ror.org\/00fq5cm18","id-type":"ROR","asserted-by":"crossref"}]}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Cannabis & Cannabinoid Research"],"published-print":{"date-parts":[[2026,8,1]]},"abstract":"\n Introduction:<\/jats:title>\n \n Cannabinoid CB\n 2<\/jats:sub>\n agonists reduce stimulus-evoked behavioral hypersensitivities in preclinical pain models, but their ability to modulate spontaneous pain remains largely unexplored. Spontaneous pain has been assessed in rodents using a conditioned place preference (CPP) approach, given that the relief of pain is described as rewarding and results in the removal of an aversive pain state. LY2828360 is a CB\n 2<\/jats:sub>\n agonist that failed in a clinical trial for osteoarthritis pain.\n <\/jats:p>\n <\/jats:sec>\n \n Materials and Methods:<\/jats:title>\n We compared the impact of LY2828360 on evoked and spontaneous pain in a spared nerve injury (SNI) model using a within-subjects design in rats. First, we used an unbiased CPP approach to verify that an analgesic dose of gabapentin (GBP) (100 mg\/kg, i.p.) produces CPP in rats with SNI, but not in sham-operated rats (Experiment 1). We then used a within-subjects design to ascertain whether LY2828360 (10 mg\/kg i.p., chronic) would suppress both evoked and spontaneous pain in rats with SNI (Experiment 2). To assess spontaneous\/affective pain behavior, we tested the ability of chronic dosing with LY2828360, in comparison to vehicle, to prevent GBP-induced CPP in the SNI model, as failure to develop CPP to GBP following treatment with an analgesic has been considered evidence of suppression of spontaneous pain. To assess evoked pain behavior, paw withdrawal thresholds were measured in the same rats used for CPP.<\/jats:p>\n <\/jats:sec>\n \n Results:<\/jats:title>\n \n GBP produced CPP in rats with SNI, but not sham surgery, and suppressed SNI-induced mechanical hypersensitivity in Experiment 1. In Experiment 2, LY2828360 reliably suppressed mechanical hypersensitivity in the paw\n ipsilateral<\/jats:italic>\n , but not\n contralateral<\/jats:italic>\n to SNI. Furthermore, efficacy was sustained across repeated injections without development of tolerance. The same rats that showed suppression of mechanically-evoked responses following chronic LY282860 treatment did not develop CPP to GBP. However, rats with SNI that were tested in parallel and treated chronically with vehicle showed robust mechanical hypersensitivity but also did not develop CPP to GBP.\n <\/jats:p>\n <\/jats:sec>\n \n Conclusion:<\/jats:title>\n \n These studies document that CB\n 2<\/jats:sub>\n agonist-induced suppression of mechanically-evoked pain is highly robust and reproducible in the SNI model, whereas CPP, used to assess spontaneous pain, is vulnerable to disruption and requires rigorous controls to rule out alternative explanations (e.g., failure to learn).\n <\/jats:p>\n <\/jats:sec>","DOI":"10.1177\/25785125261439016","type":"journal-article","created":{"date-parts":[[2026,4,4]],"date-time":"2026-04-04T10:22:23Z","timestamp":1775298143000},"page":"314-323","update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Assessments of Evoked and Spontaneous Pain Following Administration of Gabapentin and the Cannabinoid CB\n 2<\/sub>\n Agonist LY2828360 in a Rat Model of Spared Nerve Injury"],"prefix":"10.1177","volume":"11","author":[{"given":"Kelsey G.","family":"Guenther","sequence":"first","affiliation":[{"name":"Program in Neuroscience, Indiana University, Bloomington, Indiana, USA."},{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jonathon D.","family":"Crystal","sequence":"additional","affiliation":[{"name":"Program in Neuroscience, Indiana University, Bloomington, Indiana, USA."},{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0941-6435","authenticated-orcid":false,"given":"Andrea G.","family":"Hohmann","sequence":"additional","affiliation":[{"name":"Program in Neuroscience, Indiana University, Bloomington, Indiana, USA."},{"name":"Department of Psychological and Brain Sciences, Indiana University, Bloomington, Indiana, USA."},{"name":"Gill Institute for Neuroscience, Indiana University, Bloomington, Indiana, USA."}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,4,4]]},"reference":[{"key":"e_1_3_3_2_2","doi-asserted-by":"publisher","DOI":"10.1097\/j.pain.0000000000001138"},{"key":"e_1_3_3_3_2","doi-asserted-by":"publisher","DOI":"10.1111\/nyas.12095"},{"key":"e_1_3_3_4_2","doi-asserted-by":"publisher","DOI":"10.1038\/nn.2407"},{"key":"e_1_3_3_5_2","doi-asserted-by":"publisher","DOI":"10.1037\/a0013597"},{"key":"e_1_3_3_6_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.pain.2011.03.038"},{"key":"e_1_3_3_7_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.expneurol.2021.113601"},{"key":"e_1_3_3_8_2","doi-asserted-by":"publisher","DOI":"10.7554\/eLife.55582"},{"key":"e_1_3_3_9_2","doi-asserted-by":"publisher","DOI":"10.1080\/14728222.2021.1971196"},{"key":"e_1_3_3_10_2","doi-asserted-by":"publisher","DOI":"10.1038\/sj.bjp.0707531"},{"key":"e_1_3_3_11_2","doi-asserted-by":"publisher","DOI":"10.1111\/bph.70116"},{"key":"e_1_3_3_12_2","doi-asserted-by":"publisher","DOI":"10.1124\/mol.117.109355"},{"key":"e_1_3_3_13_2","doi-asserted-by":"publisher","DOI":"10.1097\/j.pain.0000000000002502"},{"key":"e_1_3_3_14_2","article-title":"Cannabinoid CB (2) receptors in primary sensory neurons are implicated in CB (2) agonist-mediated suppression of paclitaxel-induced neuropathic nociception and sexually-dimorphic sparing of morphine tolerance","author":"Guenther KG","year":"2024","unstructured":"Guenther KG, , Lin X, , Xu Z, et al. Cannabinoid CB (2) receptors in primary sensory neurons are implicated in CB (2) agonist-mediated suppression of paclitaxel-induced neuropathic nociception and sexually-dimorphic sparing of morphine tolerance. bioRxiv, 2024.","journal-title":"bioRxiv"},{"key":"e_1_3_3_15_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.phrs.2022.106560"},{"key":"e_1_3_3_16_2","doi-asserted-by":"publisher","DOI":"10.1016\/j.neuropharm.2024.110257"},{"key":"e_1_3_3_17_2","first-page":"S56","article-title":"A proof-of concept (poc) study including experimental pain models (epms) to assess the effecrs of a CB2 agonist (LY2828360) in the treatment of patients with osteoarthritic (oa) knee pain","volume":"93","author":"Pereira A","year":"2013","unstructured":"Pereira A, , Chappell A, , Dethy J, et al. A proof-of concept (poc) study including experimental pain models (epms) to assess the effecrs of a CB2 agonist (LY2828360) in the treatment of patients with osteoarthritic (oa) knee pain. 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