4.6 Article Proceedings Paper

Gold(III) complexes with 2-substituted pyridines as experimental anticancer agents: Solution behavior, reactions with model proteins, antiproliferative properties

期刊

JOURNAL OF INORGANIC BIOCHEMISTRY
卷 108, 期 -, 页码 123-127

出版社

ELSEVIER SCIENCE INC
DOI: 10.1016/j.jinorgbio.2011.11.007

关键词

Gold(III) compound; Anticancer; ESI MS

资金

  1. Fondazione Banco di Sardegna
  2. Universita degli Studi di Sassari
  3. Beneficentia Stiftung
  4. Vaduz
  5. Nanotreat Project, Regione Toscana

向作者/读者索取更多资源

Gold(III) compounds form a family of promising cytotoxic and potentially anticancer agents that are currently undergoing intense preclinical investigations. Four recently synthesized and characterized gold(III) derivatives of 2-substituted pyridines are evaluated here for their biological and pharmacological behavior. These include two cationic adducts with 2-pyridinyl-oxazolines, [Au(pyox(R))Cl-2][PF6], [pyox(R) = (S)-4-benzyl-2-(pyridin-2-yl)-4,5-dihydrooxazole, I: (S)-4-iso-propyl-2-(pyridin-2-yl)-4,5-dihydrooxazole, II] and two neutral complexes [Au(N,N ' OH)Cl-2], III, and [Au(N,N ',O)Cl], IV, containing the deprotonated ligand N-(1-hydroxy-3-iso-propyl-2-yl)pyridine-2-carboxamide, N,N ' H,OH, resulting from ring opening of bound pyox(R) ligand of complex II by hydroxide ions. The solution behavior of these compounds was analyzed. These behave as classical prodrugs: activation of the metal center typically takes place through release of the labile chloride ligands while the rest of the molecule is not altered: alternatively, activation may occur through gold(111) reduction. All compounds react eagerly with the model protein cyt c leading to extensive protein metalation. ESI MS experiments revealed details of gold-cyt c interactions and allowed us to establish the nature of protein bound metal containing fragments. The different behavior displayed by I and II compared to III and IV is highlighted. Remarkable cytotoxic properties, against the reference human ovarian carcinoma cell lines A2780/S and A2780/R were disclosed for all tested compounds with IC50 values ranging from 1.43 to 6.18 mu M in the sensitive cell line and from 1.59 to 10.86 mu M in the resistant one. The common ability of these compounds to overcome cisplatin resistance is highlighted. The obtained results are thoroughly discussed in the frame of current knowledge on cytotoxic gold compounds. (c) 2011 Elsevier Inc. All rights reserved.

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