Anticholinergic drugs rescue synaptic plasticity in DYT1 dystonia: role of M1 muscarinic receptors.

Abstract

Broad-spectrum muscarinic receptor antagonists have represented the first available treatment for different movement disorders such as dystonia. However, the specificity of these drugs and their mechanism of action is not entirely clear. We performed a systematic analysis of the effects of anticholinergic drugs on short- and long-term plasticity recorded from striatal medium spiny neurons from DYT1 dystonia knock-in (Tor1a(+/Δgag) ) mice heterozygous for ΔE-torsinA and their controls (Tor1a(+/+) mice). Antagonists were chosen that had previously been proposed to be selective for muscarinic receptor subtypes and included pirenzepine, trihexyphenydil, biperiden, orphenadrine, and a novel selective M1 antagonist, VU0255035. Tor1a(+/Δgag) mice exhibited a significant impairment of corticostriatal synaptic plasticity. Anticholinergics had no significant effects on intrinsic membrane properties and on short-term plasticity of striatal neurons. However, they exhibited a differential ability to restore the corticostriatal plasticity deficits. A complete rescue of both long-term depression (LTD) and synaptic depotentiation (SD) was obtained by applying the M1 -preferring antagonists pirenzepine and trihexyphenidyl as well as VU0255035. Conversely, the nonselective antagonist orphenadrine produced only a partial rescue of synaptic plasticity, whereas biperiden and ethopropazine failed to restore plasticity. The selectivity for M1 receptors was further demonstrated by their ability to counteract the M1 -dependent potentiation of N-methyl-d-aspartate (NMDA) current recorded from striatal neurons. Our study demonstrates that selective M1 muscarinic receptor antagonism offsets synaptic plasticity deficits in the striatum of mice with the DYT1 dystonia mutation, providing a potential mechanistic rationale for the development of improved antimuscarinic therapies for this movement disorder.

• Authors: Marta Maltese, Giuseppina Martella, Graziella Madeo, Irene Fagiolo, Annalisa Tassone, Giulia Ponterio, Giuseppe Sciamanna, Pierre Burbaud, P Jeffrey Conn, Paola Bonsi, Antonio Pisani
• Journal: Movement disorders : official journal of the Movement Disorder Society (Mov Disord) Vol. 29 Issue 13 Pg. 1655-65 (Nov 2014) ISSN: 1531-8257 [Electronic] United States
• PMID: 25195914 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2014 International Parkinson and Movement Disorder Society.

Chemical References

• Cholinergic Antagonists
• Dyt1 protein, mouse
• Molecular Chaperones

Topics

• Animals
• Biophysics
• Cholinergic Antagonists (pharmacology)
• Corpus Striatum (cytology)
• Electric Stimulation
• Excitatory Postsynaptic Potentials (drug effects)
• In Vitro Techniques
• Long-Term Potentiation (drug effects)
• Mice
• Mice, Transgenic
• Molecular Chaperones (genetics)
• Mutation (genetics)
• Neurons (drug effects)
• Patch-Clamp Techniques
• Synapses (drug effects, genetics)
• Thalamus (cytology)