A New Class of Fluorinated A2A Adenosine Receptor Agonist with Application to Last-Step Enzymatic 18F Fluorination for PET Imaging

Phillip T Lowe, Sergio Dall'Angello, Thea Mulder-Krieger, Adriaan P Ijzerman, Matteo Zanda, David O'Hagan

Research output: Contribution to journalArticle

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Abstract

The A2A adenosine receptor belongs to a family of G-coupled protein receptors that have been subjected to extensive investigation over the last few decades. Due to their prominent role in the biological functions of the heart, lungs, CNS and brain, they have become a target for the treatment of illnesses ranging from cancer immunotherapy to Parkinson's disease. The imaging of such receptors using positron emission tomography (PET) has also been of interest, potentially providing a valuable tool to analyse and diagnose various myocardial and neurodegenerative disorders, as well as offering support to drug discovery trials. Reported herein is the design, synthesis and evaluation of two novel 5'-fluorodeoxy-adenosine (FDA) based receptor agonists (FDA-PP1 and FDA-PP2), each substituted at the C-2 position with a terminally functionalised ethynyl unit. The structures enable a synthesis of 18F-labelled analogues via direct, last-step, radiosynthesis from chlorinated precursors using the fluorinase enzyme (5'-fluoro-5'-deoxyadenosine synthase) which catalyses a transhalogenation reaction. This delivers a new class of A2A adenosine receptor agonist which can be directly radiolabelled for exploration in PET studies.
Original languageEnglish
Pages (from-to)2156-2164
Number of pages9
JournalChemBioChem
Volume18
Issue number21
Early online date21 Sep 2017
DOIs
Publication statusPublished - 2 Nov 2017

Keywords

  • adenosine receptors
  • biocatalysis
  • fluorinase
  • 18F labelling
  • positron emission tomography

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