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Related Experiment Videos

[18F]FETO: metabolic considerations.

Dagmar E Ettlinger1, Wolfgang Wadsak, Leonhard-Key Mien

  • 1Department of Nuclear Medicine, Medical University of Vienna, AKH Wien, Waehringer Guertel 18-20, A-1090, Vienna, Austria.

European Journal of Nuclear Medicine and Molecular Imaging
|May 12, 2006
PubMed
Summary

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Desethyl-[(18)F]fluoroethyl-etomidate (FETO) shows comparable metabolic stability to other PET imaging agents, but undergoes rapid metabolism in humans, impacting its use for adrenal cortex imaging.

Area of Science:

  • Biochemistry
  • Radiochemistry
  • Nuclear Medicine

Background:

  • 11beta-Hydroxylase is crucial for adrenocortical steroid hormone biosynthesis.
  • This enzyme is a target for adrenal cortex imaging.
  • [(11)C]Metomidate (MTO), [(11)C]etomidate (ETO), and desethyl-[(18)F]fluoroethyl-etomidate (FETO) are PET imaging agents targeting this enzyme.

Purpose of the Study:

  • To compare the metabolic stability of MTO, ETO, and FETO against esterases.
  • To investigate the in vivo metabolic pattern of FETO in humans.

Main Methods:

  • In vitro esterase stability assays using varying concentrations of MTO, ETO, and FETO.
  • In vivo human blood sample analysis using High-Performance Liquid Chromatography (HPLC).

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Main Results:

  • FETO exhibited Michaelis-Menten constants and limiting velocities comparable to MTO and ETO, indicating similar esterase stability.
  • In vivo, FETO underwent rapid metabolism, decreasing from 91.41% at 2 minutes to 23.78% at 10 minutes post-administration.

Conclusions:

  • FETO demonstrates comparable in vitro metabolic stability to MTO and ETO.
  • FETO exhibits rapid in vivo metabolism in humans, suggesting potential limitations for sustained adrenal cortex imaging.