Skip to Main content Skip to Navigation
Journal articles

Striatal D2 Receptors Regulate Dendritic Morphology of Medium Spiny Neurons via Kir2 Channels

Abstract : Structural plasticity in the adult brain is essential for adaptive behaviors and is thought to contribute to a variety of neurological and psychiatric disorders. Medium spiny neurons of the striatum show a high degree of structural plasticity that is modulated by dopamine through unknown signaling mechanisms. Here, we demonstrate that overexpression of dopamine D2 receptors in medium spiny neurons increases their membrane excitability and decreases the complexity and length of their dendritic arbors. These changes can be reversed in the adult animal after restoring D2 receptors to wild-type levels, demonstrating a remarkable degree of structural plasticity in the adult striatum. Increased excitability and decreased dendritic arborization are associated with downregulation of inward rectifier potassium channels (Kir2.1/2.3). Downregulation of Kir2 function is critical for the neurophysiological and morphological changes in vivo because virally mediated expression of a dominant-negative Kir2 channel is sufficient to recapitulate the changes in D2 transgenic mice. These findings may have important implications for the understanding of basal ganglia disorders, and more specifically schizophrenia, in which excessive activation of striatal D2 receptors has long been hypothesized to be of pathophysiologic significance.
Document type :
Journal articles
Complete list of metadatas

Cited literature [48 references]  Display  Hide  Download

https://www.hal.inserm.fr/inserm-02472212
Contributor : Maxim Cazorla <>
Submitted on : Monday, February 10, 2020 - 9:50:06 AM
Last modification on : Monday, February 10, 2020 - 11:36:23 AM
Document(s) archivé(s) le : Monday, May 11, 2020 - 1:44:18 PM

File

Cazorla et al (2012, J Neurosc...
Publisher files allowed on an open archive

Identifiers

Collections

Citation

Maxime Cazorla, Mariya Shegda, Bhavani Ramesh, Neil Harrison, Christoph Kellendonk. Striatal D2 Receptors Regulate Dendritic Morphology of Medium Spiny Neurons via Kir2 Channels. Journal of Neuroscience, Society for Neuroscience, 2012, ⟨10.1523/JNEUROSCI.6056-11.2012⟩. ⟨inserm-02472212⟩

Share

Metrics

Record views

80

Files downloads

143