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While it is commonly classified as an\n                    <jats:italic>N<\/jats:italic>\n                    -methyl D-aspartate receptor (NMDAR) antagonist, our picture of ketamine\u2019s mechanistic underpinnings is incomplete. Recent clinical evidence has indicated, controversially, that a component of the efficacy of subanesthetic ketamine may be opioid dependent. Using pharmacological functional ultrasound imaging in rats, we found that blocking opioid receptors suppressed neurophysiologic changes evoked by ketamine, but not by a more selective NMDAR antagonist, in limbic regions implicated in the pathophysiology of depression and in reward processing. Importantly, this opioid-dependent response was strongly sex-dependent, as it was not evident in female subjects and was fully reversed by surgical removal of the male gonads. We observed similar sex-dependent effects of opioid blockade affecting ketamine-evoked postsynaptic density and behavioral sensitization, as well as in opioid blockade-induced changes in opioid receptor density. Together, these results underscore the potential for ketamine to induce its affective responses via opioid signaling, and indicate that this opioid dependence may be strongly influenced by subject sex. These factors should be more directly assessed in future clinical trials.\n                  <\/jats:p>","DOI":"10.1038\/s41467-024-45157-7","type":"journal-article","created":{"date-parts":[[2024,1,30]],"date-time":"2024-01-30T05:02:14Z","timestamp":1706590934000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Sex dependence of opioid-mediated responses to subanesthetic ketamine in rats"],"prefix":"10.1038","volume":"15","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8305-8205","authenticated-orcid":false,"given":"Tommaso","family":"Di Ianni","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6985-1431","authenticated-orcid":false,"given":"Sedona N.","family":"Ewbank","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4360-1503","authenticated-orcid":false,"given":"Marjorie R.","family":"Levinstein","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8253-7113","authenticated-orcid":false,"given":"Matine M.","family":"Azadian","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Reece C.","family":"Budinich","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0398-4917","authenticated-orcid":false,"given":"Michael","family":"Michaelides","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5259-5606","authenticated-orcid":false,"given":"Raag D.","family":"Airan","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"297","published-online":{"date-parts":[[2024,1,30]]},"reference":[{"key":"45157_CR1","doi-asserted-by":"publisher","first-page":"351","DOI":"10.1016\/S0006-3223(99)00230-9","volume":"47","author":"RM Berman","year":"2000","unstructured":"Berman, R. 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