Comparison of the binding of the irreversible monoamine oxidase tracers, [11C]clorgyline and [11C]l-deprenyl in brain and peripheral organs in humans

Joanna S. Fowler, Jean Logan, Gene Jack Wang, Nora D. Volkow, Frank Telang, Yu Shin Ding, Colleen Shea, Victor Garza, Youwen Xu, Zizhong Li, David Alexoff, Paul Vaska, Richard Ferrieri, David Schlyer, Wei Zhu, S. John Gatley

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31 Scopus citations

Abstract

The monoamine oxidase A and B (MAO A and B) radiotracers [ 11C]clorgyline (CLG) and [11C]L-deprenyl (DEP) and their deuterium labeled counterparts (CLG-D and DEP-D) were compared to determine whether their distribution and kinetics in humans are consistent with their physical, chemical and pharmacological properties and the reported ratios of MAO A:MAO B in post-mortem human tissues. Irreversible binding was consistently higher for DEP in brain, heart, kidneys and spleen but not lung where CLG >DEP and not in thyroid where there is no DEP binding. The generally higher DEP binding is consistent with its higher enzyme affinity and larger free fraction in plasma while differences in regional distribution for CLG and DEP in brain, heart, thyroid and lungs are consistent with different relative ratios of MAO A and B in humans.

Original languageEnglish
Pages (from-to)313-319
Number of pages7
JournalNuclear Medicine and Biology
Volume31
Issue number3
DOIs
StatePublished - Apr 2004
Externally publishedYes

Keywords

  • Brain
  • Monoamine oxidase A and B
  • Peripheral organs

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