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We had previously found that chronic opiate usage in humans and long-term opiate administration to mice significantly increased the number of detected hypocretin\/orexin (Hcrt) neurons, decreased their size, and increased Hcrt level in the hypothalamus. We also found that opiates significantly decreased cataplexy in human narcoleptics as well as in narcoleptic mice and that cessation of locus coeruleus neuronal activity preceded and was tightly linked to cataplectic attacks in narcoleptic dogs. We tested the hypothesis that SXB produces changes similar to opiates and now report that chronic SXB administration significantly increased the size of Hcrt neurons, the reverse of what we had seen with opiates in humans and mice. Levels of Hcrt in the hypothalamus were nonsignificantly lower, in contrast to the significant increase in hypothalamic Hcrt level after opiates. SXB decreased tyrosine hydroxylase levels in the locus coeruleus, the major descending projection of the hypocretin system, also the reverse of what we saw with opioids. Therefore despite some similar effects on narcoleptic symptomatology, SXB does not produce anatomical changes similar to those elicited by opiates. Analysis of changes in other links in the cataplexy pathway might further illuminate SXB\u2019s mechanism of action on narcolepsy.<\/jats:p>","DOI":"10.1093\/sleep\/zsad135","type":"journal-article","created":{"date-parts":[[2023,5,8]],"date-time":"2023-05-08T18:45:55Z","timestamp":1683571555000},"source":"Crossref","is-referenced-by-count":6,"title":["Effects of sodium oxybate on hypocretin\/orexin and locus coeruleus neurons"],"prefix":"10.1093","volume":"46","author":[{"given":"Ming-Fung","family":"Wu","sequence":"first","affiliation":[{"name":"Department of Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine, University of California , Los Angeles, CA , USA"},{"name":"Neurobiology Research, VA Greater Los Angeles Healthcare System , North Hills, CA , USA"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Thomas C","family":"Thannickal","sequence":"additional","affiliation":[{"name":"Department of Psychiatry and Biobehavioral Sciences, David Geffen 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