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The level of NR1 subunit mRNA significantly increased in hippocampal complexes 1 h after a single i.p. injection of cocaine. After repeated cocaine injection, the mean scores of stereotyped behavior were increased with the number of injections. The level of NR1 subunit mRNA was obviously decreased in the striatum and cortices 24 h (early withdrawal) after a final injection following 14 days of subchronic administration. During the early withdrawal period, the amount of the NR1 subunit decreased in the nucleus accumbens, globus pallidus, and subiculum. In the dentate gyrus, the NR1 mRNA level significantly increased during early withdrawal in rats subchronically treated with cocaine. Levels of NR2B subunit mRNA were reduced in the cortices and striatum. During late withdrawal from cocaine, the level of NR2C subunit mRNA in the cerebellum was also reduced. These findings suggest that the disruption of NR1, NR2B, and NR2C subunits in the discrete brain regions occurs under the cocaine\u2010related behavioral abnormalities and would be closely implicated in the initiation and expression of behavioral sensitization induced by repeated cocaine administration. Further studies on the changes in non\u2010NMDA receptors are required to elucidate the biological significance of glutamate receptors for the mechanisms underlying the development of behavioral sensitization. Synapse 46:157\u2013169, 2002. \u00a9 2002 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/syn.10132","type":"journal-article","created":{"date-parts":[[2002,10,9]],"date-time":"2002-10-09T04:16:58Z","timestamp":1034137018000},"page":"157-169","source":"Crossref","is-referenced-by-count":32,"title":["Repeated cocaine administration differentially affects NMDA receptor subunit (NR1, NR2A\u2010C) mRNAs in rat brain"],"prefix":"10.1002","volume":"46","author":[{"given":"Mika","family":"Yamaguchi","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Toshihito","family":"Suzuki","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shuzo","family":"Abe","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takafumi","family":"Hori","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hirofumi","family":"Kurita","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takashi","family":"Asada","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nobuo","family":"Okado","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Heii","family":"Arai","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2002,9,3]]},"reference":[{"key":"e_1_2_1_2_1","doi-asserted-by":"publisher","DOI":"10.1002\/1098-2396(200010)38:1<51::AID-SYN6>3.0.CO;2-A"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006-8993(94)90033-7"},{"key":"e_1_2_1_4_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.16-01-00019.1996"},{"key":"e_1_2_1_5_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0306-3623(98)00107-4"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1002\/(SICI)1098-2396(199710)27:2<133::AID-SYN4>3.0.CO;2-F"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.15-06-04687.1995"},{"key":"e_1_2_1_8_1","doi-asserted-by":"crossref","first-page":"381","DOI":"10.2174\/138161280504230110102541","article-title":"Antagonists selective for NMDA receptors containing the NR2B subunit","volume":"5","author":"Chenard BL","year":"1999","journal-title":"Curr Pharm Res"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1471-4159.1999.0722397.x"},{"key":"e_1_2_1_10_1","doi-asserted-by":"publisher","DOI":"10.1023\/A:1020769816332"},{"key":"e_1_2_1_11_1","doi-asserted-by":"publisher","DOI":"10.1016\/S0028-3908(99)00043-X"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1016\/0006-8993(95)00327-M"},{"key":"e_1_2_1_13_1","doi-asserted-by":"publisher","DOI":"10.1176\/ajp.130.10.1088"},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1016\/0741-8329(91)90543-6"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.16-01-00274.1996"},{"key":"e_1_2_1_16_1","doi-asserted-by":"publisher","DOI":"10.1046\/j.1471-4159.1999.0720157.x"},{"key":"e_1_2_1_17_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.17-07-02492.1997"},{"key":"e_1_2_1_18_1","doi-asserted-by":"publisher","DOI":"10.1097\/00001756-199608120-00040"},{"key":"e_1_2_1_19_1","doi-asserted-by":"publisher","DOI":"10.1016\/0376-8716(94)01063-Q"},{"key":"e_1_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.1523\/JNEUROSCI.13-01-00266.1993"},{"key":"e_1_2_1_21_1","doi-asserted-by":"crossref","first-page":"276","DOI":"10.1523\/JNEUROSCI.13-01-00276.1993","article-title":"Time course of extracellular dopamine and behavioral sensitization to cocaine. 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