{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,13]],"date-time":"2026-10-13T10:29:06Z","timestamp":1791887346124,"version":"4.3.4"},"reference-count":26,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2018,12,13]],"date-time":"2018-12-13T00:00:00Z","timestamp":1544659200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Neuropsychopharm Rep"],"published-print":{"date-parts":[[2019,3]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Aims<\/jats:title><jats:p>The human <jats:italic><jats:styled-content style=\"fixed-case\">NRCAM<\/jats:styled-content><\/jats:italic> gene is associated with polysubstance use. <jats:italic>Nrcam<\/jats:italic> knockout mice do not acquire a preference for addictive substances. We aimed to elucidate the role of <jats:italic>Nrcam<\/jats:italic> in specific neural circuits underlying congenital preference for substances and the acquisition of addiction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>We analyzed gene expression patterns of neural molecules to find a common addiction pathway dependent on <jats:italic>Nrcam<\/jats:italic> function. We examined monoaminergic, glutamatergic, and <jats:styled-content style=\"fixed-case\">GABA<\/jats:styled-content>ergic systems in the brains of <jats:italic>Nrcam<\/jats:italic> knockout mice following treatment with methamphetamine (<jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content>) or saline (<jats:styled-content style=\"fixed-case\">SAL<\/jats:styled-content>) using micro\u2010array gene expression analysis, which was replicated using TaqMan gene expression analysis. To find a common addiction pathway, we examined similarities and differences between the expression patterns of molecules in <jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content>\u2010treated mice and in <jats:italic>Nrcam<\/jats:italic> knockout mice treated with cocaine (<jats:styled-content style=\"fixed-case\">COC<\/jats:styled-content>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Glutaminase expression in brain was reduced in <jats:italic>Nrcam<\/jats:italic> heterozygous mice after <jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content> and <jats:styled-content style=\"fixed-case\">COC<\/jats:styled-content> treatment, consistent with our previous study. Metabotropic glutamate receptor 2 expression was reduced in <jats:italic>Nrcam<\/jats:italic> heterozygous mice that received either <jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content> or <jats:styled-content style=\"fixed-case\">COC<\/jats:styled-content> treatment. Several other molecules could act in independent addiction pathways involving <jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content> or <jats:styled-content style=\"fixed-case\">COC<\/jats:styled-content>. We also found that <jats:styled-content style=\"fixed-case\">GABA<\/jats:styled-content> receptor subunit g2 expression was reduced in <jats:italic>Nrcam<\/jats:italic> heterozygous mice that underwent <jats:styled-content style=\"fixed-case\">SAL<\/jats:styled-content> treatment, and that <jats:styled-content style=\"fixed-case\">METH<\/jats:styled-content> treatment attenuated this reduction.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Nrcam differentially regulates glutamatergic and <jats:styled-content style=\"fixed-case\">GABA<\/jats:styled-content>ergic molecules in naive brains and in brains of animals with acquired addiction. Elucidating the complex neural mechanisms underlying polysubstance use will uncover biological features of addiction and may contribute to the development of effective pharmaceutical treatments.<\/jats:p><\/jats:sec>","DOI":"10.1002\/npr2.12038","type":"journal-article","created":{"date-parts":[[2018,12,14]],"date-time":"2018-12-14T05:10:05Z","timestamp":1544764205000},"page":"10-16","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Neuronal cell adhesion molecule regulating neural systems underlying addiction"],"prefix":"10.1002","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1620-7204","authenticated-orcid":false,"given":"Hiroki","family":"Ishiguro","sequence":"first","affiliation":[{"name":"Department of Neuropsychiatry and Clinical Ethics University of Yamanashi Chuo 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