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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

Lookup NU author(s): Dr Iwo Bohr, Professor Ian McKeith, Emeritus Professor Robert Perry, Emeritus Professor Elaine Perry, Dr Jennifer Court, Dr Margaret Piggott

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Abstract

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.

Publication metadata

Author(s): Bohr IJ, Ray MA, McIntosh JM, Chalon S, Guilloteau D, McKeith IG, Perry RH, Clementi F, Perry EK, Court JA, Piggott MA

Publication type: Article

Publication status: Published

Journal: Experimental Neurology

Year: 2005

Volume: 191

Issue: 2

Pages: 292-300

ISSN (print): 0014-4886

ISSN (electronic): 1090-2430

Publisher: Academic Press

URL: http://dx.doi.org/10.1016/j.expneurol.2004.10.004

DOI: 10.1016/j.expneurol.2004.10.004

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