L-DOPA–induced
dyskinesia in Parkinson’s
Might be caused by a loss in normal synaptic
plasticity
The team leaded by
Paolo Calabresi at University of Rome Tor Vergata has studied alterations of
corticostriatal responses in L-DOPA treated rats (B.
Picconi et al. Loss of bi-directional striatal synaptic plasticity in
L-DOPA-induced dyskinesia. Nature Neuroscience, published online, doi:
10.1038/nn1040, 2003) concluding that development of dyskinesia was related
to alterations in synaptic functioning of the system. In particular they noted
a compromission of depotentiation depending on low-frequency stimulation which
needs protein phosphatase activity: the striata of dyskinetic rats contained
abnormally high levels of phospho[Thr34]-DARPP-32, an inhibitor of protein
phosphatase1.
BML- April 2003