Combined chelation of bi-functional bis-hydroxypiridinone and mono-hydroxypiridinone

Synthesis, solution and in vivo evaluation

Sofia Gama, Marco Gil, Lurdes Gano, Etelka Farkas, M. Amélia Santos

Research output: Contribution to journalArticle

13 Citations (Scopus)

Abstract

3-Hydroxy-4-pyridinones (3,4-HP) are well known iron-chelators with applications in medicinal chemistry, mainly associated with their high affinity towards trivalent hard metal ions (e.g. M3+, M = Fe, Al, Ga) and use as decorporating agents in situations of metal accumulation. The polydenticity and the extra-functionality of 3,4-HP derivatives have been explored, aimed at improving the chelating efficacy and the selectivity of the interaction with specific biological receptors. However, the ideal conjugation of both features in one molecular unity usually leads to high molecular weight compounds which can have crossing-membrane limitations. Herein, a different approach is used combining a arylpiperazine-containing bis-hydroxypyridone (H2L1) with a biomimetic mono-hydroxypyridinone, ornithine-derivative (HL2), to assess the potential coadjuvating effect that could result from the administration of both compounds for the decorporation of hard metal ions. This work reports the results of solution and in vivo studies on their chelating efficacy either as a simple binary or a ternary system (H2L1:HL2:M3+), using potentiometric and spectrophotometric methods. The solution complexation studies with Fe(III) indicate that the solubility of the complexes is considerably increased in the ternary system, an important feature for the metal complex excretion, upon the metal sequestration. The results of the in vivo studies with 67Ga-injected mice show differences on the biodistribution profiles of the radiotracer, upon the administration of each chelating agent, that are mainly ascribed to the differences of their extra-functional groups and lipo/hydrophilic character. However, administration of both chelating agents leads to a more steady metal mobilization, which may be attributed to an improved access to different cellular compartments.

Original languageEnglish
Pages (from-to)288-298
Number of pages11
JournalJournal of Inorganic Biochemistry
Volume103
Issue number2
DOIs
Publication statusPublished - Feb 2009

Fingerprint

Chelating Agents
Chelation
Metals
Ternary systems
Metal ions
Ions
Pyridones
Derivatives
Biomimetics
Ornithine
Pharmaceutical Chemistry
Coordination Complexes
Complexation
Solubility
Functional groups
Iron
Molecular Weight
Molecular weight
Membranes
hard metal

Keywords

  • Chelation therapy
  • Combined chelation
  • Hydroxypyridinonate complexes
  • Hydroxypyridinone
  • Ternary complex

ASJC Scopus subject areas

  • Biochemistry
  • Inorganic Chemistry

Cite this

Combined chelation of bi-functional bis-hydroxypiridinone and mono-hydroxypiridinone : Synthesis, solution and in vivo evaluation. / Gama, Sofia; Gil, Marco; Gano, Lurdes; Farkas, Etelka; Amélia Santos, M.

In: Journal of Inorganic Biochemistry, Vol. 103, No. 2, 02.2009, p. 288-298.

Research output: Contribution to journalArticle

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