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Journal Articles International Journal of Molecular Sciences Year : 2021

Silver (I) N-Heterocyclic Carbene Complexes: A Winning and Broad Spectrum of Antimicrobial Properties

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Filippo Prencipe
  • Function : Author
Anna Zanfardino
  • Function : Author
  • PersonId : 1104424
Michela Di Napoli
  • Function : Author
Filomena Rossi
  • Function : Author
Stefano D’errico
  • Function : Author
Gennaro Piccialli
  • Function : Author
  • PersonId : 1104425
Giuseppe Felice Mangiatordi
  • Function : Author
Michele Saviano
  • Function : Author
  • PersonId : 1104426
Mario Varcamonti
  • Function : Correspondent author
  • PersonId : 1104427

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Diego Tesauro
  • Function : Correspondent author
  • PersonId : 1104428

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Abstract

The evolution of antibacterial resistance has arisen as the main downside in fighting bacterial infections pushing researchers to develop novel, more potent and multimodal alternative drugs.Silver and its complexes have long been used as antimicrobial agents in medicine due to the lack of silver resistance and the effectiveness at low concentration as well as to their low toxicities compared to the most commonly used antibiotics. N-Heterocyclic Carbenes (NHCs) have been extensively employed to coordinate transition metals mainly for catalytic chemistry. However, more recently, NHC ligands have been applied as carrier molecules for metals in anticancer applications. In the present study we selected from literature two NHC-carbene based on acridinescaffoldand detailed nonclassicalpyrazole derived mono NHC-Ag neutral and bis NHC-Ag cationic complexes. Their inhibitor effect on bacterial strains Gram-negative and positivewas evaluated. Imidazolium NHC silver complex containing the acridine chromophore showed effectiveness at extremely low MIC values. Although pyrazole NHC silver complexes are less active than the acridine NHC-silver, they represent the first example of this class of compounds with antimicrobial properties. Moreover all complexesare not toxic and they show not significant activity againstmammalian cells (Hek lines) after 4 and 24 h. Based on our experimental evidence, we are confident that this promising class of complexes could represent a valuable starting point for developing candidates for the treatment of bacterial infections, delivering great effectiveness and avoiding the development of resistance mechanisms.
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Dates and versions

hal-03279690 , version 1 (06-07-2021)

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Filippo Prencipe, Anna Zanfardino, Michela Di Napoli, Filomena Rossi, Stefano D’errico, et al.. Silver (I) N-Heterocyclic Carbene Complexes: A Winning and Broad Spectrum of Antimicrobial Properties. International Journal of Molecular Sciences, 2021, 22 (5), pp.2497. ⟨10.3390/ijms22052497⟩. ⟨hal-03279690⟩
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