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Although preclinical data suggest similar behavioral expression of opioid use between sexes, conclusive evidence on sex differences in craving and relapse across abstinence periods remains lacking. Here, we investigated the effects of abstinence from oxycodone self-administration on neurotransmission in the paraventricular thalamus (PVT) to nucleus accumbens shell (NAcSh) pathway in male and female rats. Using optogenetics and ex vivo electrophysiology, we assessed synaptic strength, glutamate release probability, and intrinsic excitability of NAcSh medium spiny neurons (MSNs) following 1 (acute) or 14 (prolonged) days of forced abstinence. No sex differences were observed in oxycodone self-administration or somatic withdrawal. However, females exhibited greater cue-induced relapse after prolonged but not acute abstinence. Prolonged abstinence produced comparable increases in PVT-NAcSh synaptic strength and presynaptic glutamate release probability in both sexes, while inhibitory transmission and MSN excitability were largely unaltered. The dissociation between comparable circuit-level plasticity and sex-specific relapse vulnerability suggests that PVT-NAcSh strengthening represents a shared neuroadaptation to oxycodone abstinence, while mechanisms driving heightened relapse in females likely involve additional circuit elements that remain to be identified.<\/jats:p>","DOI":"10.7554\/elife.102189","type":"journal-article","created":{"date-parts":[[2025,1,13]],"date-time":"2025-01-13T12:25:25Z","timestamp":1736771125000},"update-policy":"https:\/\/doi.org\/10.7554\/elife.102189","source":"Crossref","is-referenced-by-count":0,"title":["Thalamo-accumbal circuit adaptations following extended oxycodone abstinence"],"prefix":"10.7554","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7553-4408","authenticated-orcid":true,"given":"Yanaira","family":"Alonso Caraballo","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01kta7d96","id-type":"ROR","asserted-by":"publisher"}],"name":"Department of 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