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Tc-Glutathione Complex (Tc -GSH) : Labelling, Chemical Characterization and Biodistribution in Rats.

K Baba1, J L Moretti, P Weinmann

  • 1Université Paris Nord Laboratoire de Biophysique Expérimentale et Radiopharmacologie UPRES 2360, UFR Santé Médecine Biologie Humaine 74, rue M. Cachin Bobigny cedex 93018 France.

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Technetium-99m-glutathione complex (Tc-GSH) was synthesized with high yield. Characterization confirmed a 2:1 GSH/Tc ratio, with technetium coordinated by sulfur and nitrogen atoms, suitable for biodistribution studies.

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Published on: December 13, 2013

Area of Science:

  • Radiochemistry
  • Nuclear Medicine
  • Bioconjugation Chemistry

Background:

  • Glutathione (GSH) is a crucial endogenous antioxidant.
  • Technetium-99m (Tc-99m) is a widely used radioisotope for medical imaging.

Purpose of the Study:

  • To establish the chemical structure of Tc-99m-GSH complex.
  • To characterize the Tc-GSH complex and evaluate its biodistribution.

Main Methods:

  • Labeling of GSH with Tc-99m using stannous chloride.
  • Purification and characterization using UV-Vis spectroscopy, HPLC, Biogel chromatography, mass spectrometry, and NMR spectroscopy.
  • Biodistribution studies in normal rats.

Main Results:

  • High yield labeling of GSH with Tc-99m achieved.
  • Characterization revealed a 2:1 GSH/Tc molar ratio, with Tc coordinated via cysteinyl sulfur and nitrogen atoms.
  • Biodistribution showed rapid blood clearance and excretion primarily via kidneys, with no significant organ accumulation.

Conclusions:

  • The Tc-GSH complex exists as an anionic dimer (GSH-Tc-GSH).
  • It is a tetradentate complex with pentavalent technetium coordinated by two GSH ligands.
  • Tc-GSH demonstrates favorable pharmacokinetic properties for potential radiopharmaceutical applications.