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α4β2 nicotinic receptor status in Alzheimer's disease using 123I-5IA-85380 single-photon-emission computed tomography

Lookup NU author(s): Professor John O'Brien, Dr Sean Colloby, Dr Sanjeet Pakrasi, Emeritus Professor Robert Perry, Professor Ian McKeith, Professor David Williams

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Abstract

Background: Loss of the α4β2 nicotinic receptor subtype is found at autopsy in Alzheimer's disease. Objective: To investigate in vivo changes in this receptor using single-photon-emission CT (SPECT) with 123I-5- iodo-3-[2(S)-2-azetidinylmethoxy] pyridine (5IA-85380), a novel nicotinic acetylcholine receptor ligand which binds predominantly to the α4β2 receptor. Methods: 32 non-smoking subjects (16 with Alzheimer's disease and 16 normal elderly controls) underwent 123I-5IA-85380 and perfusion (99mTc-hexamethylenepropyleneamine oxime (HMPAO)) SPECT scanning. Region of interest analysis was performed with cerebellar normalisation. Results: Significant bilateral reductions in nicotinic receptor binding were identified in frontal (left, p = 0.004; right, p = 0.002), striatal (left, p = 0.004; right, p = 0.003), right medial temporal (p = 0.04) and pons (p<0.001) in patients with AD compared to controls. There were no significant correlations with clinical or cognitive measures. The pattern of nicotinic binding significantly differed from that of perfusion in both patients with AD and controls. Both 123I-5IA-85380 and 99mTc-HMPAO SPECT imaging demonstrated similar diagnostic performance in correctly classifying controls and patients with AD. Conclusion: Using 123I-5IA-85380 SPECT we found changes consistent with significant reductions in the nicotinic α4β2 receptor in cortical and striatal brain regions. This method could facilitate diagnosis and may be useful for monitoring progression of the disease and response to treatment in patients with AD and related diseases.


Publication metadata

Author(s): O'Brien JT, Colloby SJ, Pakrasi S, Perry EK, Pimlott SL, Wyper DJ, McKeith IG, Williams ED

Publication type: Article

Publication status: Published

Journal: Journal of Neurology, Neurosurgery and Psychiatry

Year: 2007

Volume: 78

Issue: 4

Pages: 356-361

ISSN (print): 0022-3050

ISSN (electronic): 1468-330X

Publisher: BMJ Group

URL: http://dx.doi.org/10.1136/jnnp.2006.108209

DOI: 10.1136/jnnp.2006.108209

PubMed id: 17135460


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