Evaluation in vitro and in animals of a new 11C-labeled PET radioligand for metabotropic glutamate receptors 1 in brain

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• 作者：Paolo Zanotti-Fregonara (1)
  Vanessa N. Barth (2)
  Jeih-San Liow (1)
  Sami S. Zoghbi (1)
  David T. Clark (1)
  Emily Rhoads (2)
  Edward Siuda (2)
  Beverly A. Heinz (2)
  Eric Nisenbaum (2)
  Bruce Dressman (2)
  Elizabeth Joshi (2)
  Debra Luffer-Atlas (2)
  Matthew J. Fisher (2)
  John J. Masters (2)
  Nancy Goebl (2)
  Steven L. Kuklish (2)
  Cheryl Morse (1)
  Johannes Tauscher (2)
  Victor W. Pike (1)
  Robert B. Innis (1) (3)
  
• 关键词：mGlu1 receptors ; PET ; Brain
• 刊名：European Journal of Nuclear Medicine and Molecular Imaging
• 出版年：2013
• 出版时间：January 2013
• 年：2013
• 卷：40
• 期：2
• 页码：245-253
• 全文大小：383KB
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• 作者单位：Paolo Zanotti-Fregonara (1)
  Vanessa N. Barth (2)
  Jeih-San Liow (1)
  Sami S. Zoghbi (1)
  David T. Clark (1)
  Emily Rhoads (2)
  Edward Siuda (2)
  Beverly A. Heinz (2)
  Eric Nisenbaum (2)
  Bruce Dressman (2)
  Elizabeth Joshi (2)
  Debra Luffer-Atlas (2)
  Matthew J. Fisher (2)
  John J. Masters (2)
  Nancy Goebl (2)
  Steven L. Kuklish (2)
  Cheryl Morse (1)
  Johannes Tauscher (2)
  Victor W. Pike (1)
  Robert B. Innis (1) (3)
  
  1. Molecular Imaging Branch, National Institute of Mental Health, National Institutes of Health, 10 Center Drive, Bethesda, MD, 20892, USA
  2. Eli Lilly & Co., 839 S Delaware St, Indianapolis, IN, 46225, USA
  3. Molecular Imaging Branch, National Institute of Mental Health, Bldg. 10, Rm. B1D43, 10 Center Drive, MSC-1026, Bethesda, MD, 20892-1026, USA
  
• ISSN：1619-7089

文摘

Purpose Two allosteric modulators of the group I metabotropic glutamate receptors (mGluR1 and mGluR5) were evaluated as positron emission tomography (PET) radioligands for mGluR1. Methods LY2428703, a full mGluR1 antagonist (IC50 8.9?nM) and partial mGluR5 antagonist (IC50 118?nM), and LSN2606428, a full mGluR1 and mGluR5 antagonist (IC50 35.3?nM and 10.2?nM, respectively) were successfully labeled with 11C and evaluated as radioligands for mGluR1. The pharmacology of LY2428703 was comprehensively assessed in vitro and in vivo, and its biodistribution was investigated by liquid chromatography-mass spectrometry/mass spectrometry, and by PET imaging in the rat. In contrast, LSN2606428 was only evaluated in vitro; further evaluation was stopped due to its unfavorable pharmacological properties and binding affinity. Results 11C-LY2428703 showed promising characteristics, including: (1) high potency for binding to human mGluR1 (IC50 8.9?nM) with no significant affinity for other human mGlu receptors (mGluR2 through mGluR8); (2) binding to brain displaceable by administration of an mGluR1 antagonist; (3) only one major radiometabolite in both plasma and brain, with a negligible brain concentration (with 3.5?% of the total radioactivity in cerebellum) and no receptor affinity; (4) a large specific and displaceable signal in the mGluR1-rich cerebellum with no significant in vivo affinity for mGluR5, as shown by PET studies in rats; and (5) lack of substrate behavior for efflux transporters at the blood–brain barrier, as shown by PET studies conducted in wild-type and knockout mice. Conclusion 11C-LY2428703, a new PET radioligand for mGluR1 quantification, displayed promising characteristics both in vitro and in vivo in rodents.