Synthesis and preliminary in vivo evaluation of new [18F]fluoro-inositols as Positron Emission Tomography radiotracers

Bioorg Med Chem. 2017 Oct 15;25(20):5603-5612. doi: 10.1016/j.bmc.2017.08.035. Epub 2017 Aug 22.

Abstract

This study describes the synthesis and radiosynthesis of eight new [18F]fluoro-inositol-based radiotracers in myo- and scyllo-inositol configuration. These radiotracers are equipped with a propyl linker bearing fluorine-18. This fluorinated arm is either on a hydroxyl group, i.e. O-alkylated inositols, or on the cyclohexyl backbone, i.e. C-branched derivatives. To modulate lipophilicity, inositols were synthesized in acetylated or hydroxylated form. Automated radiosynthesis was performed on the AllInOne module and the radiotracers were produced in good radiochemical yields (15-31.5% dc). Preliminary in vivo preclinical evaluation of these eight [18F]fluoro-inositols as Positron Emission Tomography (PET) imaging agents in a breast tumour-bearing mouse model was performed and compared with [18F]-2-fluoro-2-deoxy-d-glucose ([18F]FDG). Amongst the different inositols, [18F]myo-2 showed the highest tumour uptake 2.34±0.39%ID/g, revealing the potential of this tracer for monitoring breast cancer.

Keywords: Breast cancer; Fluorine-18; Inositols; PET; Positron Emission Tomography.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Breast Neoplasms / diagnostic imaging
  • Breast Neoplasms / pathology
  • Disease Models, Animal
  • Female
  • Fluorine Radioisotopes* / standards
  • Humans
  • Inositol / analogs & derivatives
  • Inositol / chemical synthesis
  • Inositol / chemistry*
  • Mice
  • Molecular Structure
  • Positron-Emission Tomography*
  • Radiopharmaceuticals*

Substances

  • Fluorine Radioisotopes
  • Radiopharmaceuticals
  • Inositol