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In previous research, mice that were selectively bred for higher amounts of methamphetamine consumption, using a two\u2010bottle choice methamphetamine drinking procedure, were found to be less sensitive to the locomotor stimulant effects of morphine and of the more selective \u03bc\u2010opioid receptor agonist fentanyl, compared to mice that were bred for low methamphetamine consumption. This suggested that \u03bc\u2010opioid receptor\u2010mediated pathways may influence genetic risk for methamphetamine consumption. We hypothesized that these differences in opioid sensitivity would impact opioid intake in the methamphetamine drinking lines and that drugs with \u03bc\u2010opioid receptor activity would impact methamphetamine intake. Consumption of morphine was examined in 2, two\u2010bottle choice studies, one that compared morphine to quinine consumption and another that used a saccharin fading procedure. Next, naltrexone (0, 0.5, 1, 2, 5, 10 and 20\u2009mg\/kg), a \u03bc\u2010opioid receptor antagonist, and buprenorphine (0, 1, 2 or 4\u2009mg\/kg), a \u03bc\u2010opioid receptor partial agonist, were each examined for their effects on the acquisition of methamphetamine consumption. Low methamphetamine drinking mice consumed more morphine compared to high methamphetamine drinking mice. Naltrexone did not alter methamphetamine consumption in either selected line; however, buprenorphine reduced methamphetamine intake in the high methamphetamine drinking line. These data show that greater sensitivity to opioids is associated with greater opioid intake and warrant further investigation of drugs with \u03bc\u2010opioid receptor\u2010specific agonist activity in genetically determined differences in methamphetamine consumption.<\/jats:bold><\/jats:p>","DOI":"10.1111\/gbb.12100","type":"journal-article","created":{"date-parts":[[2013,10,23]],"date-time":"2013-10-23T22:28:46Z","timestamp":1382567326000},"page":"226-235","source":"Crossref","is-referenced-by-count":19,"title":["Morphine intake and the effects of naltrexone and buprenorphine on the acquisition of methamphetamine intake"],"prefix":"10.1111","volume":"13","author":[{"given":"E. C.","family":"Eastwood","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"T. 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