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Multi-target heteroleptic palladium bisphosphonate complexes.

Micaella Cipriani1, Santiago Rostán1, Ignacio León2

  • 1Química Inorgánica, Facultad de Química, UdelaR, Montevideo, Uruguay.

Journal of Biological Inorganic Chemistry : JBIC : a Publication of the Society of Biological Inorganic Chemistry
|April 2, 2020
PubMed
Summary
This summary is machine-generated.

New palladium complexes with N-containing bisphosphonates show potent antiparasitic activity against T. cruzi. These compounds are non-toxic to mammalian cells and may act by interacting with parasite DNA.

Keywords:
BisphosphonateChagasDNAPalladiumToxoplasmosis

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Area of Science:

  • Medicinal Chemistry
  • Parasitology
  • Coordination Chemistry

Background:

  • Bisphosphonates are widely used for bone diseases and some exhibit antiparasitic properties.
  • Previous work developed transition metal complexes with N-containing bisphosphonates (NBPs).

Purpose of the Study:

  • To synthesize and characterize novel heteroleptic palladium-NBP complexes with DNA intercalating co-ligands.
  • To evaluate their antiparasitic activity against T. cruzi and assess their mechanism of action.

Main Methods:

  • Synthesis and full characterization of four palladium-NBP complexes.
  • In vitro evaluation of antiparasitic activity against T. cruzi (amastigote form).
  • Assessment of cytotoxicity in mammalian cells and enzyme inhibition assays.

Main Results:

  • All synthesized palladium complexes showed significantly higher activity against T. cruzi than NBPs alone.
  • Complexes were non-toxic to mammalian cells at active concentrations.
  • Phenanthroline-containing complexes were 15 times more active than bipyridine analogs.
  • Enzyme inhibition assays showed potential but no direct correlation with antiparasitic activity.

Conclusions:

  • Palladium-NBP complexes with DNA intercalating co-ligands are promising antiparasitic agents.
  • The high activity of phenanthroline complexes may be linked to DNA interaction.
  • These compounds represent potential leads for developing new anti-parasitic drugs.