Anticancer profile of a series of gold(III) (2-phenyl)pyridine complexes.

Abstract:

:Six phosphorescent (2-phenyl)pyridine (ppy) gold(III) 2,4,6-tris(trifluoromethyl)phenyl (FMes) complexes were synthesized and investigated for their anticancer potential. The compounds demonstrated strong antiproliferative activity, with EC50 values in the low micromolar range, along with significant accumulation in HeLa cancer cells after treatment for only 6 h (up to 119 ng gold per milligram of protein as measured by high-resolution continuum source atomic spectroscopy). Enzyme inhibition studies showed interaction of the gold(III) complexes with thioredoxin reductase (TrxR), a key homeostasis-regulation flavoprotein. TrxR was inhibited with IC50 values in the micromolar range. Furthermore, five of the complexes displayed selectivity toward TrxR against glutathione reductase (GR, a disulfide reductase structurally related to TrxR) by up to >49-fold. Because no major differences in bioactivity were observed across the series, [(ppy)Au(FMes)(PPh3 )OTf] (complex 4) was chosen for further in-depth biological characterization. Complex 4 was also found to interact with guanosine monophosphate in (1) H NMR studies under long incubation times. Interestingly, 4 induced a significant increase in intracellular levels of reactive oxygen species, which led to late apoptotic events and cytocidal effects.

journal_name

ChemMedChem

journal_title

ChemMedChem

authors

Rubbiani R,Zehnder TN,Mari C,Blacque O,Venkatesan K,Gasser G

doi

10.1002/cmdc.201402446

subject

Has Abstract

pub_date

2014-12-01 00:00:00

pages

2781-90

issue

12

eissn

1860-7179

issn

1860-7187

journal_volume

9

pub_type

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