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Area of Science:

  • Cardiovascular Imaging
  • Molecular Imaging
  • Inflammation Research

Background:

  • Fluorine 18 fluorodeoxyglucose (FDG) positron emission tomography (PET) is explored for detecting atherosclerotic plaque inflammation and macrophage burden.
  • Published reports on FDG PET's efficacy in identifying vulnerable plaques show inconsistencies.
  • Macrophage colony-stimulating factor (M-CSF) and granulocyte-M-CSF (GM-CSF) may differentially regulate macrophage glucose metabolism, potentially explaining these inconsistencies.

Purpose of the Study:

  • To investigate whether differential regulation of macrophage glucose metabolism by M-CSF and GM-CSF contributes to inconsistent FDG uptake in vascular inflammation.
  • To determine if FDG uptake can differentiate between stable and unstable atherosclerotic plaques.
  • To assess the specificity of FDG uptake in various inflammatory vascular conditions.

Main Methods:

  • Induction of inflammatory and metabolic profiles in cultured macrophages and murine atherosclerotic plaques.
  • Measurement of glucose uptake in response to M-CSF and GM-CSF.
  • Comparison of FDG uptake patterns in atherosclerosis versus other large-artery inflammatory vascular diseases.

Main Results:

  • Both M-CSF and GM-CSF induced comparable glucose uptake in macrophages and atherosclerotic plaques.
  • FDG uptake reflects total vascular macrophage burden but does not reliably differentiate between stable and unstable plaques.
  • FDG uptake is indistinguishable in atherosclerosis compared to other inflammatory vascular diseases like Takayasu arteritis or foreign-body reactions.

Conclusions:

  • FDG uptake is a marker of vascular macrophage burden, not necessarily plaque instability.
  • The nonspecific nature of FDG uptake by various cells and conditions limits its specificity for inflammatory atherosclerosis.
  • A more cautious approach is warranted when interpreting vascular FDG uptake in clinical settings for diagnosing inflammatory atherosclerosis.