Abstract
The dopamine D4 receptor (D4R) is a candidate gene for attention deficit/hyperactivity disorder (ADHD) based on genetic studies reporting that particular polymorphisms are present at a higher frequency in affected children. However, the direct participation of the D4R in the onset or progression of ADHD has not been tested. Here, we generated a mouse model with high face value to screen candidate genes for the clinical disorder by neonatal disruption of central dopaminergic pathways with 6-hydroxydopamine (6-OHDA). The lesioned mice exhibited hyperactivity that waned after puberty, paradoxical hypolocomotor responses to amphetamine and methylphenidate, poor behavioral inhibition in approach/avoidance conflict tests and deficits in continuously performed motor coordination tasks. To determine whether the D4R plays a role in these behavioral phenotypes, we performed 6-OHDA lesions in neonatal mice lacking D4Rs (Drd4−/−). Although striatal dopamine contents and tyrosine hydroxylase-positive midbrain neurons were reduced to the same extent in both genotypes, Drd4−/− mice lesioned with 6-OHDA did not develop hyperactivity. Similarly, the D4R antagonist PNU-101387G prevented hyperactivity in wild-type 6-OHDA-lesioned mice. Furthermore, wild-type mice lesioned with 6-OHDA showed an absence of behavioral inhibition when tested in the open field or the elevated plus maze, while their Drd4−/− siblings exhibited normal avoidance for the unprotected areas of these mazes. Together, our results from a combination of genetic and pharmacological approaches demonstrate that D4R signaling is essential for the expression of juvenile hyperactivity and impaired behavioral inhibition, relevant features present in this ADHD-like mouse model.
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Acknowledgements
We thank M Garibaldi, N Malarini, B Wyss and M Ricca for excellent technical assistance and MG Murer and A Ramoj for thoughtful ideas. We thank K Merchant (Pharmacia & Upjohn) for kindly providing PNU-101387G. This work was supported in part by an International Research Scholar Grant of the Howard Hughes Medical Institute (MR), Agencia Nacional de Promoción Científica y Tecnológica (MR), CONICET (MR), Universidad de Buenos Aires (MR), JS Guggenheim Foundation (MR) National Science Foundation (MJL) and National Institute of Drug Abuse (DKG, MJL). ME Avale, T Falzone and D Gelman are recipients of doctoral fellowships of CONICET, Argentina.
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Avale, M., Falzone, T., Gelman, D. et al. The dopamine D4 receptor is essential for hyperactivity and impaired behavioral inhibition in a mouse model of attention deficit/hyperactivity disorder. Mol Psychiatry 9, 718–726 (2004). https://doi.org/10.1038/sj.mp.4001474
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DOI: https://doi.org/10.1038/sj.mp.4001474
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