Identification of Piccolo as a regulator of behavioral plasticity and dopamine transporter internalization

Molecular Psychiatry
Xiaobo CenToshitaka Nabeshima

Abstract

Dopamine transporter (DAT) internalization is a mechanism underlying the decreased dopamine reuptake caused by addictive drugs like methamphetamine (METH). We found that Piccolo, a presynaptic scaffolding protein, was overexpressed in the nucleus accumbens (NAc) of the mice repeatedly administrated with METH. Piccolo downexpression by antisense technique augmented METH-induced behavioral sensitization, conditioned reward and synaptic dopamine accumulation in NAc. Expression of Piccolo C2A domain attenuated METH-induced inhibition of dopamine uptake in PC12 cells expressing human DAT. Consistent with this, it slowed down the accelerated DAT internalization induced by METH, thus maintaining the presentation of plasmalemmal DAT. In immunostaining and structural modeling Piccolo C2A domain displays an unusual feature of sequestering membrane phosphatidylinositol 4,5-bisphosphate, which may underlie its role in modulating DAT internalization. Together, our results indicate that Piccolo upregulation induced by METH represents a homeostatic response in the NAc to excessive dopaminergic transmission. Piccolo C2A domain may act as a cytoskeletal regulator for plasmalemmal DAT internalization, which may underlie its contributions in beha...Continue Reading

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Citations

May 8, 2009·Molecular Brain·Heping ZhangFang Liu
Jan 23, 2016·Frontiers in Synaptic Neuroscience·Eckart D GundelfingerCraig C Garner
Sep 24, 2015·European Neuropsychopharmacology : the Journal of the European College of Neuropsychopharmacology·Joanne RyanMarie-Laure Ancelin
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Mar 7, 2021·NPJ Parkinson's Disease·Mengfei BuHabibeh Khoshbouei
Sep 19, 2021·The Journal of Pharmacology and Experimental Therapeutics·Douglas R MillerHabibeh Khoshbouei

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