期刊
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS
卷 356, 期 3, 页码 733-738出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.bbrc.2007.03.041
关键词
GAD(65); GAD(67); GABA; PKC; cocaine; pergolide; ondansetron; nucleus accumbens; caudate; behavioral sensitization
资金
- NIDA NIH HHS [R21 DA021185-01, DA-10327, R01 DA014323, R01 DA012768, R21 DA021185, DA-14323] Funding Source: Medline
We have recently shown in rats that cocaine-induced behavioral sensitization can be reversed by a 5-day treatment with ondansetron given 3.5 h after daily pergolide injections. In this study we further investigated the molecular/neurochemical alterations underlying cocaine sensitization and pergolide/ondansetron-mediated reversal. Results revealed that glutamic acid decarboxylase (GAD(65)/ GAD(67)) is higher abundant in the nucleus accurribens (NAc) than that in the caudate and medial prefrontal cortex (mPFC), while GABA(A) receptor alpha 2 subunit level in the NAc shell is less abundant than that in the NAc core, mPFC and caudate. Cocaine sensitization led to (1) a decrease in GAD67 expression, an increase in total protein kinase C (PKC) xi subtype and phosphorylated PKC xi/lambda. levels in the NAc core; (2) a decrease in GAD67 and GABAA receptor a2 subunit expression, and an increase in phosphorylated PKC xi/lambda levels in the NAc shell; (3) an increase in GAD67 expression in the caudate. Importantly, pergolide/ondansetron treatment reversed these alterations. These results suggest that reversal of cocaine-induced behavioral sensitization is associated with reversal of region-specific changes in GABA function and PKC activity in the striatum. (c) 2007 Elsevier Inc. All rights reserved.
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