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Aripiprazole differentially affects mesolimbic and nigrostriatal dopaminergic transmission: implications for long-term drug efficacy and low extrapyramidal side-effects

Journal Article


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Abstract


  • Aripiprazole has been used effectively to treat schizophrenia in the clinic ; however, its mechanisms of

    action are not clear. This study examined how short- and long-term aripiprazole treatment affects dopaminergic transmission in mesolimbic and nigrostriatal pathways. For comparison, the effects of haloperidol and olanzapine treatment were also examined. Aripiprazole significantly increased D2 receptor mRNA expression and decreased tyrosine hydroxylase (TH) mRNA expression in the ventral tegmental area (VTA) after 1- and 12-wk treatment, but had no effect in substantia nigra (SN) and nucleus accumbens (NAc). Aripiprazole also decreased dopamine transporter (DAT) binding density in NAc (for 1- and 12- wk treatment) and VTA (1-wk treatment). In contrast, haloperidol significantly increased D2 receptor binding density and decreased DAT binding density in NAc and caudate putamen (CPu) after 1- and 12- wk treatment, and it also decreases DAT binding in VTA after 12-wk treatment. Olanzapine had less widespread effects, namely an increase in D2 receptor mRNA in VTA after 12-wk treatment and decreased DAT binding in NAc after 1-wk treatment. These results suggest that aripiprazole has selective effects on the mesolimbic dopaminergic pathway. Selectively reducing dopamine synthesis in VTA is a possible therapeutic mechanism for the long-term efficacy of aripiprazole in controlling schizophrenia symptoms with reduced extrapyramidal side-effects.

Publication Date


  • 2009

Citation


  • Han, M., Huang, X. & Deng, C. (2009). Aripiprazole differentially affects mesolimbic and nigrostriatal dopaminergic transmission: implications for long-term drug efficacy and low extrapyramidal side-effects. International Journal of Neuropsychopharmacology, 12 (7), 941-952.

Scopus Eid


  • 2-s2.0-69349089612

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3110&context=hbspapers

Ro Metadata Url


  • http://ro.uow.edu.au/hbspapers/2057

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 941

End Page


  • 952

Volume


  • 12

Issue


  • 7

Abstract


  • Aripiprazole has been used effectively to treat schizophrenia in the clinic ; however, its mechanisms of

    action are not clear. This study examined how short- and long-term aripiprazole treatment affects dopaminergic transmission in mesolimbic and nigrostriatal pathways. For comparison, the effects of haloperidol and olanzapine treatment were also examined. Aripiprazole significantly increased D2 receptor mRNA expression and decreased tyrosine hydroxylase (TH) mRNA expression in the ventral tegmental area (VTA) after 1- and 12-wk treatment, but had no effect in substantia nigra (SN) and nucleus accumbens (NAc). Aripiprazole also decreased dopamine transporter (DAT) binding density in NAc (for 1- and 12- wk treatment) and VTA (1-wk treatment). In contrast, haloperidol significantly increased D2 receptor binding density and decreased DAT binding density in NAc and caudate putamen (CPu) after 1- and 12- wk treatment, and it also decreases DAT binding in VTA after 12-wk treatment. Olanzapine had less widespread effects, namely an increase in D2 receptor mRNA in VTA after 12-wk treatment and decreased DAT binding in NAc after 1-wk treatment. These results suggest that aripiprazole has selective effects on the mesolimbic dopaminergic pathway. Selectively reducing dopamine synthesis in VTA is a possible therapeutic mechanism for the long-term efficacy of aripiprazole in controlling schizophrenia symptoms with reduced extrapyramidal side-effects.

Publication Date


  • 2009

Citation


  • Han, M., Huang, X. & Deng, C. (2009). Aripiprazole differentially affects mesolimbic and nigrostriatal dopaminergic transmission: implications for long-term drug efficacy and low extrapyramidal side-effects. International Journal of Neuropsychopharmacology, 12 (7), 941-952.

Scopus Eid


  • 2-s2.0-69349089612

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=3110&context=hbspapers

Ro Metadata Url


  • http://ro.uow.edu.au/hbspapers/2057

Has Global Citation Frequency


Number Of Pages


  • 11

Start Page


  • 941

End Page


  • 952

Volume


  • 12

Issue


  • 7