The presence of alpha6 subunit containing nicotinic acetylcholine receptors on nigrostriatal dopaminergic neurons has been demonstrated in rodents and monkeys. [I-125]alpha-conotoxinMII is a radioligand that binds to alpha6, and also alpha3 subunits of nicotinic acetylcholine receptors (nAChRs). In the present study, we have compared the distribution of [I-125]-conotoxinMII binding in post mortem human tissue from four groups of patients: individuals with dementia with Lewy bodies displaying extra-pyramidal features (DLB + EPF), DLB without extrapyramidal features (DLB - EPF) Parkinson's disease without dementia (PD) and age-matched controls. Reduced binding was observed in the putamen and caudate in PD and both DLB groups. In DLB patients, the decline was greater in DLB + EPF compared to DLB - EPF group. The declines in nicotinic receptor binding in the striatum were in part paralleled by reductions in the striatal dopamine transporter. In the thalamus, [I-125]alpha-conotoxinMII binding was significantly reduced in the centromedian nucleus in both DLB groups, and also in the parafascicular nucleus in the DLB - EPF group. In DLB + EPF and PD patients, there was decreased binding in the ventral lateral nucleus. This study demonstrates alterations of alpha6 and/or alpha3 nAChRs binding in DLB and PD, which are likely to relate to extra-pyramidal symptoms. (C) 2004 Elsevier Inc. All rights reserved.
|Titolo:||Cholinergic nicotinic receptor involvement in movement disorders associated with Lewy body diseases. An autoradiography study using [I-125]alpha-conotoxinMII in the striatum and thalamus|
|Parole Chiave:||Centromedial nucleus; Corpus striatum; Dopamine transporter; Lewy body disease; Neurodegenerative diseases; Nicotinic acetylcholine receptors; Parafascicular nucleus; Parkinson disease; Thalamus ventral lateral|
|Settore Scientifico Disciplinare:||Settore BIO/14 - Farmacologia|
|Data di pubblicazione:||feb-2005|
|Digital Object Identifier (DOI):||10.1016/j.expneurol.2004.10.004|
|Appare nelle tipologie:||01 - Articolo su periodico|