Document Detail


Synthesis and preliminary evaluation of piperidinyl and pyrrolidinyl iodobenzoates as imaging agents for butyrylcholinesterase.
MedLine Citation:
PMID:  20976626     Owner:  NLM     Status:  In-Data-Review    
Abstract/OtherAbstract:
PURPOSE: The purpose of this study is to synthesize and evaluate specific agents for molecular imaging of butyrylcholinesterase (BuChE), known to be associated with neuritic plaques and neurofibrillary tangles in Alzheimer's disease (AD). In this study, these agents were tested in a normal rat model. The distribution of radiolabel was compared with known BuChE histochemical distribution in the rat brain.
PROCEDURES: Iodobenzoate esters were synthesized and tested, through spectrophotometric analysis, as specific substrates for BuChE. These compounds were converted to the corresponding (123)I esters from tributyltin intermediates and purified for studies in the rat model. Whole body dynamic scintigraphic images were obtained for biodistribution studies. Autoradiograms of brain sections were obtained and compared to histochemical distribution of the enzyme in this model system.
RESULTS: The three iodobenzoate esters studied were specific substrates for BuChE. Whole body biodistribution studies with (123)I-labeled compounds showed rapid disappearance from the body while radioactivity was retained in the head region. Brain section autoradiography of animals injected with these labeled compounds indicated that most areas known to contain BuChE corresponded to areas of radioactivity accumulation.
CONCLUSION: BuChE-specific radiolabeled iodobenzoates enter the brain and, in general, label areas known to exhibit BuChE activity in histochemical studies. Such molecules may represent a new direction for the development of agents for the molecular imaging of BuChE in the living brain, especially in regions where BuChE-containing neuropathological structures appear in AD.
Authors:
Ian R Macdonald; G Andrew Reid; E Eric Joy; Ian R Pottie; Gilbert Matte; Steven Burrell; George Mawko; Earl Martin; Sultan Darvesh
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Molecular imaging and biology : MIB : the official publication of the Academy of Molecular Imaging     Volume:  13     ISSN:  1860-2002     ISO Abbreviation:  Mol Imaging Biol     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-09     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101125610     Medline TA:  Mol Imaging Biol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1250-61     Citation Subset:  IM    
Affiliation:
Department of Anatomy and Neurobiology and the Neuroscience Institute, Dalhousie University, Halifax, NS, B3H 1X5, Canada.
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