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- W1589526158 abstract "Alterations in the density of acetylcholinergic muscarinic receptors (m-AChR) have been observed in various dementias. This has spurred interest in the development of radiohalogenated ligands which can be used for the non-invasive in vivo detection of m-AChR by nuclear medicine techniques. We have developed a new ligand 1-azabicyclo[2.2.2]oct-3-yl ({alpha}-hydroxy-{alpha}-(1-iodo-1-propen-3-yl)-{alpha}-phenylacetate (IQNP,12) which demonstrates high affinity for the muscarinic receptor. When labeled with radioiodine it has been shown to be selective and specific for m-ACHR. Initial studies on the separation and in vivo evaluation of the various isomers of IQNP have shown that the stereochemistry of the chiral centers and the configuration around the double bond play an important role in m-AChR subtype specificity. In vivo evaluation of these stereoisomers demonstrate that E-(R,R)-IQNP has a high affinity for the M{sub 1} muscarinic subtype while Z-(R,R)-IQNP demonstrate a high affinity for M{sub 1} and M{sub 2} receptor subtypes. These data demonstrate IQNP (12) has potential for use in the non-evasive in vivo detection of m-AChR by single photon emission computed tomography (SPECT). A brominated analogue, ``BrQNP,`` in which the iodine has been replaced by a bromine atom, has also been prepared and was shown to block the in vivo uptake of IQNP inmore » the brain and heart and therefore has potential for positron emission tomographic (PET) studies of m-AChR.« less" @default.
- W1589526158 created "2016-06-24" @default.
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- W1589526158 date "1994-06-01" @default.
- W1589526158 modified "2023-09-22" @default.
- W1589526158 title "Development of radiohalogenated muscarinic ligands for the in vivo imaging of m-AChR by nuclear medicine techniques" @default.
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