Abstract
Progressive Supranuclear Palsy (PSP) is a progressive neurodegenerative disorder. In contrast to Parkinson's disease (PD) and dementia with Lewy bodies (DLB), replacement therapy with dopaminergic and cholinergic agents in PSP has been disappointing. The neurochemical basis for this is unclear. Our objective was to measure dopaminergic and cholinergic receptors in the basal ganglia of PSP and control brains. We measured, autoradiographically, dopaminergic (dopamine transporter, ^125^I PE2I and dopamine D2 receptors, ^125^I epidepride) and cholinergic (nicotinic ฮฑ4ฮฒ2 receptors, ^125^I 5IA85380 and muscarinic M1 receptors, ^3^H pirenzepine) parameters in the striatum and pallidum of pathologically confirmed PSP cases (n = 15) and controls (n = 32). In PSP, there was a marked loss of dopamine transporter and nicotinic ฮฑ4ฮฒ2 binding in the striatum and pallidum, consistent with loss of nigrostriatal neurones. Striatal D2 receptors were increased in the caudate and muscarinic M1 receptors were unchanged compared with controls. These results do not account for the poor response to dopaminergic and cholinergic replacement therapies in PSP, and suggest relative preservation of postsynaptic striatal projection neurones bearing D2/M1 receptors. ยฉ 2007 Movement Disorder Society