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New gold pincer-type complexes: synthesis, characterization, DNA binding studies and cytotoxicity

Overview of attention for article published in Dalton Transactions: An International Journal of Inorganic Chemistry, January 2018
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  • Above-average Attention Score compared to outputs of the same age and source (56th percentile)

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2 tweeters

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Title
New gold pincer-type complexes: synthesis, characterization, DNA binding studies and cytotoxicity
Published in
Dalton Transactions: An International Journal of Inorganic Chemistry, January 2018
DOI 10.1039/c8dt02903b
Pubmed ID
Authors

Snežana Radisavljević, Ioannis Bratsos, Andreas Scheurer, Jana Korzekwa, Romana Masnikosa, Aleksandar Tot, Nevenka Gligorijević, Siniša Radulović, Ana Rilak Simović

Abstract

With the aim of assessing whether Au(iii) compounds with pincer type ligands might be utilized as potential antitumor agents, three new monofunctional Au(iii) complexes of the general formula [Au(N-N'-N)Cl]Cl2, where N-N'-N = 2,6-bis(5-tert-butyl-1H-pyrazol-3-yl)pyridine (H2LtBu, 1), 2,6-bis(5-tert-butyl-1-methyl-1H-pyrazol-3-yl)pyridine (Me2LtBu, 2) or 2,6-bis((4S,7R)-1,7,8,8-tetramethyl-4,5,6,7-tetrahydro-1H-4,7-methanoindazol-3-yl)pyridine (Me2*L, 3) were synthesized. All complexes were characterized by elemental analysis, spectroscopic techniques (IR, UV-Vis, 1D and 2D NMR) and mass spectrometry (MALDI TOF MS). The chemical behavior of the complexes under physiological conditions was studied by UV-Vis spectroscopy, which showed that all compounds were remarkably stable and that the gold center remained in the 3+ oxidation state. The kinetics and the mechanism of the reaction of complexes 1-3 with guanine derivatives (i.e. guanosine (Guo) and guanosine-5'-monophosphate (5'-GMP)) and calf thymus DNA (CT DNA) were studied by stopped-flow spectroscopy. The three complexes displayed moderately different rate constants in their reactions with Guo, 5'-GMP and CT DNA, which can be explained by the steric hindrance and σ-donicity of the methyl substituent on the bis-pyrazolylpyridine fragment in complexes 2 and 3. The measured enthalpies and entropies of activation (ΔH≠ > 0, ΔS≠ < 0) supported an associative mechanism for the substitution process. The interaction of the newly synthesized complexes 1-3 with CT DNA was investigated by UV-Vis and fluorescence spectroscopy, and also by viscosity measurements, which all indicated that complexes 1-3 bound to CT DNA with moderate binding affinity (Kb = 1.6-5.7 × 103 M-1) and stabilized the duplex of CT DNA. Molecular docking indicated that complexes 1-3 interacted with DNA via intercalation. Complex 1 reduced the cell survival of all the investigated cell lines (A549, A375, and LS-174) with IC50 values being up to 20 μM. We have shown that 1 induced perturbations of the cell cycle and led to apoptosis in human melanoma A375 cells. Complex 1 also affected the level of reactive oxygen species (ROS) in the same cells. However, pre-treatment of A375 cells with NAC (ROS scavenger) reversed the effect of 1 on their survival.

Twitter Demographics

The data shown below were collected from the profiles of 2 tweeters who shared this research output. Click here to find out more about how the information was compiled.

Mendeley readers

The data shown below were compiled from readership statistics for 21 Mendeley readers of this research output. Click here to see the associated Mendeley record.

Geographical breakdown

Country Count As %
Unknown 21 100%

Demographic breakdown

Readers by professional status Count As %
Student > Ph. D. Student 6 29%
Researcher 4 19%
Student > Master 2 10%
Lecturer 2 10%
Student > Doctoral Student 1 5%
Other 1 5%
Unknown 5 24%
Readers by discipline Count As %
Chemistry 12 57%
Biochemistry, Genetics and Molecular Biology 2 10%
Medicine and Dentistry 1 5%
Unknown 6 29%

Attention Score in Context

This research output has an Altmetric Attention Score of 1. This is our high-level measure of the quality and quantity of online attention that it has received. This Attention Score, as well as the ranking and number of research outputs shown below, was calculated when the research output was last mentioned on 17 September 2018.
All research outputs
#10,760,276
of 13,526,754 outputs
Outputs from Dalton Transactions: An International Journal of Inorganic Chemistry
#4,763
of 14,573 outputs
Outputs of similar age
#199,479
of 266,408 outputs
Outputs of similar age from Dalton Transactions: An International Journal of Inorganic Chemistry
#104
of 315 outputs
Altmetric has tracked 13,526,754 research outputs across all sources so far. This one is in the 11th percentile – i.e., 11% of other outputs scored the same or lower than it.
So far Altmetric has tracked 14,573 research outputs from this source. They receive a mean Attention Score of 1.1. This one has gotten more attention than average, scoring higher than 61% of its peers.
Older research outputs will score higher simply because they've had more time to accumulate mentions. To account for age we can compare this Altmetric Attention Score to the 266,408 tracked outputs that were published within six weeks on either side of this one in any source. This one is in the 13th percentile – i.e., 13% of its contemporaries scored the same or lower than it.
We're also able to compare this research output to 315 others from the same source and published within six weeks on either side of this one. This one has gotten more attention than average, scoring higher than 56% of its contemporaries.