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In addition, to assess a potential mechanism, an oxytocin (OT) promoter\u2010linked hM3Dq DREADD was infused into the paraventricular nucleus of the hypothalamus to determine whether peer\u2010induced cocaine seeking is decreased by activation of OT neurons. Male rats underwent twice\u2010daily self\u2010administration sessions, once with cocaine in the presence of one peer (S+) and once with saline in the presence of a different peer (S\u2212). Another experiment used similar procedures, except the discriminative stimuli were nonsocial (constant vs flashing light\/tone), with one stimulus paired with cocaine (S+) and the other paired with saline (S\u2212). A third experiment injected male and female rats with OTp\u2010hM3Dq DREADD or control virus into PVN and tested them for peer\u2010induced reinstatement of cocaine seeking following clozapine (0.1\u2009mg\/kg). Although acquisition of cocaine self\u2010administration was similar in rats trained with either peer or light\/tone discriminative stimuli, the latency to first response was reduced by the peer S+, but not by the light\/tone S+. In addition, the effect of the conditioned stimulus was overshadowed by the peer S+ but not by the light\/tone S+. Clozapine blocked the effect of the peer S+\u2009in rats receiving the OTp\u2010hM3Dq DREADD virus, but not in rats receiving the control virus. These results demonstrate that a social peer can serve as potent trigger for drug seeking and that OT in PVN modulates peer\u2010induced reinstatement of cocaine seeking.<\/jats:p>","DOI":"10.1111\/adb.13217","type":"journal-article","created":{"date-parts":[[2022,8,9]],"date-time":"2022-08-09T08:25:55Z","timestamp":1660033555000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Peer\u2010induced cocaine seeking in rats: Comparison to nonsocial stimuli and role of paraventricular hypothalamic oxytocin neurons"],"prefix":"10.1111","volume":"27","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0750-6656","authenticated-orcid":false,"given":"Lindsey R.","family":"Hammerslag","sequence":"first","affiliation":[{"name":"Department of Psychology University of Kentucky  Lexington Kentucky USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bree 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