Allosteric activation of M-4 muscarinic receptors improve behavioral and physiological alterations in early symptomatic YAC128 mice

作者：Pancani Tristano; Foster Daniel J; Moehle Mark S; Bichell Terry Jo; Bradley Emma; Bridges Thomas M; Klar Rebecca; Poslusney Mike; Rook Jerri M; Daniels J Scott; Niswender Colleen M; Jones Carrie K; Wood Michael R; Bowman Aaron B; Lindsley Craig W; Xiang Zixiu^*; Conn P Jeffrey

来源：Proceedings of the National Academy of Sciences of the United States of America, 2015, 112(45): 14078-14083.

DOI：10.1073/pnas.1512812112

• neurodegenerative
• basal ganglia
• movement disorder
• trinucleotide repeat disorder

Mutations that lead to Huntington's disease (HD) result in increased transmission at glutamatergic corticostriatal synapses at early pre-symptomatic stages that have been postulated to set the stage for pathological changes and symptoms that are observed at later ages. Based on this, pharmacological interventions that reverse excessive corticostriatal transmission may provide a novel approach for reducing early physiological changes and motor symptoms observed in HD. We report that activation of the M-4 subtype of muscarinic acetylcholine receptor reduces transmission at corticostriatal synapses and that this effect is dramatically enhanced in presymptomatic YAC128 HD and BACHD relative to wild-type mice. Furthermore, chronic administration of a novel highly selective M-4 positive allosteric modulator (PAM) beginning at presymptomatic ages improves motor and synaptic deficits in 5-mo-old YAC128 mice. These data raise the exciting possibility that selective M-4 PAMs could provide a therapeutic strategy for the treatment of HD.

• 出版日期2015-11-10