Referenced in: none

Automatically associated channels: Cav1.3

Title: Selective elimination of glutamatergic synapses on striatopallidal neurons in Parkinson disease models.

Authors: Michelle Day, Zhongfeng Wang, Jun Ding, Xinhai An, Cali A Ingham, Andrew F Shering, David Wokosin, Ema Ilijic, Zhuoxin Sun, Allan R Sampson, Enrico Mugnaini, Ariel Y Deutch, Susan R Sesack, Gordon W Arbuthnott, D James Surmeier

Journal, date & volume: Nat. Neurosci., 2006 Feb , 9, 251-9

PubMed link: http://www.ncbi.nlm.nih.gov/pubmed/16415865

Abstract
Parkinson disease is a common neurodegenerative disorder that leads to difficulty in effectively translating thought into action. Although it is known that dopaminergic neurons that innervate the striatum die in Parkinson disease, it is not clear how this loss leads to symptoms. Recent work has implicated striatopallidal medium spiny neurons (MSNs) in this process, but how and precisely why these neurons change is not clear. Using multiphoton imaging, we show that dopamine depletion leads to a rapid and profound loss of spines and glutamatergic synapses on striatopallidal MSNs but not on neighboring striatonigral MSNs. This loss of connectivity is triggered by a new mechanism-dysregulation of intraspine Cav1.3 L-type Ca(2+) channels. The disconnection of striatopallidal neurons from motor command structures is likely to be a key step in the emergence of pathological activity that is responsible for symptoms in Parkinson disease.