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EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...

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[99mTc]Technetium and Rhenium Dithiocarbazate Complexes: Chemical Synthesis and Biological Assessment.

André Gustavo de Araujo Fernandes1,2, Alyne Eloise Lafratta3, Carolina Portela Luz3

  • 1Instituto de Química de São Carlos, Universidade de São Paulo, São Carlos 13566-590, SP, Brazil.

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|January 25, 2025
PubMed
Summary

New rhenium and technetium complexes using S-benzyl-5-hydroxy-3-methyl-5-phenyl-4,5-dihydro-1H-pirazol-1-carbodithionate (H2bdtc) showed high spleen uptake but limited tumor accumulation. Further studies are needed to understand TM1M tumor uptake heterogeneity.

Keywords:
B16F10TM1Mdithiocarbazatesrheniumtechnetium-99mtumor

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Area of Science:

  • Radiochemistry
  • Coordination Chemistry
  • Nuclear Medicine

Background:

  • Dithiocarbazates (DTCs) and their metal complexes are investigated for anticancer properties.
  • This study focuses on novel rhenium and technetium complexes derived from S-benzyl-5-hydroxy-3-methyl-5-phenyl-4,5-dihydro-1H-pirazol-1-carbodithionate (H2bdtc).

Purpose of the Study:

  • To synthesize and characterize novel rhenium and technetium complexes with H2bdtc.
  • To evaluate the tumor uptake and biodistribution of these complexes in animal models.

Main Methods:

  • Synthesis of a rhenium complex [ReO(bdtc)(Hbdtc)] using H2bdtc and (NBu4)[ReOCl4].
  • Preparation of the technetium-99m complex [[99mTc]TcO(bdtc)(Hbdtc)] from H2bdtc and [99mTc]TcO4-.
  • Characterization included spectroscopic methods (IR, NMR, MS) and radiochromatography; stability and biodistribution studies were performed in mice bearing B16F10 and TM1M tumors.

Main Results:

  • The rhenium complex featured asymmetric coordination with two dithiocarbazate ligands.
  • The 99mTc complex was synthesized with high radiochemical yield (~93%), exhibited hydrophobicity (LogP = 1.03), and demonstrated stability in PBS and L-histidine, but instability in L-cysteine and limited stability in plasma.
  • Biodistribution studies revealed significant spleen uptake (55.46%) and minimal tumor uptake (<1%) in B16F10 models; in vivo SPECT/CT confirmed these findings, noting heterogeneous TM1M tumor accumulation.

Conclusions:

  • H2bdtc is a promising chelator for rhenium and technetium complexation.
  • The observed spleen uptake warrants further investigation for potential therapeutic applications in spleen-related conditions.
  • The heterogeneous TM1M tumor uptake necessitates future studies to elucidate the underlying mechanisms.