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- W2022135049 abstract "Disturbances of the cerebral cholinergic neurotransmitter system are present in neurodegenerative disorders. SPECT or PET imaging, using radiotracers that selectively target muscarinic receptor subtypes, may be of value for in vivo evaluation of such conditions. 6 β -acetoxynortropane, a potent muscarinic M 2 receptor agonist, has previously demonstrated nanomolar affinity and high selectivity for this receptor. Based on this compound we synthesized four nortropane derivatives that are potentially suitable for SPECT imaging of the M 2 receptor. 6 β -acetoxynortropane and the novel derivatives were tested in vitro for affinity to the muscarinic M 1−3 receptors. The original 6 β -acetoxynortropane displayed high affinity (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=M1><mml:mrow><mml:msub><mml:mi>K</mml:mi><mml:mi>i</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn>70</mml:mn><mml:mi>–</mml:mi><mml:mn>90</mml:mn></mml:mrow></mml:math> nM) to M 2 receptors and showed good selectivity ratios to the M 1 (65-fold ratio) and the M 3 (70-fold ratio) receptors. All new derivatives showed reduced affinity to the M 2 subtype and loss of subtype selectivity. It is therefore concluded that the newly synthesized derivatives are not suitable for human SPECT imaging of M 2 receptors." @default.
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- W2022135049 date "2011-06-13" @default.
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- W2022135049 title "Synthesis and In Vitro Evaluation of Novel Nortropane Derivatives as Potential Radiotracers for Muscarinic M2 Receptors" @default.
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- W2022135049 doi "https://doi.org/10.1155/2011/709416" @default.
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