The Evaluation of Metal Co-ordinating Bis-Thiosemicarbazones as Potential Anti-malarial Agents

Author(s): Fady N. Akladios, Scott D. Andrew, Samantha J. Boog, Carmen de Kock, Richard K. Haynes, Christopher J. Parkinson*

Journal Name: Medicinal Chemistry

Volume 15 , Issue 1 , 2019

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Graphical Abstract:


Background: The emergence of resistance to the artemisinins which are the current mainstays for antimalarial chemotheraphy has created an environment where the development of new drugs acting in a mechanistally discrete manner is a priority.

Objective: The goal of this work was to synthesize ane evaluate bis-thiosemicarbazones as potential antimalarial agents.

Methods: Fifteen compounds were generated using two condensation protocols and evaluated in vitro against the NF54 (CQ sensitive) strain of Plasmodium falciparum. A preliminary assessment of the potential for human toxicity was conducted in vitro against the MRC5 human lung fibroblast line.

Results: The activity of the bis-thiosemicarbazones was highly dependent on the nature of the arene at the core of the structure. The inclusion of a non-coordinating benzene core resulted in inactive compounds, while the inclusion of a pyridyl core resulted in compounds of moderate or potent antimalarial activity (4 compounds showing IC50 < 250 nM).

Conclusion: Bis-thiosemicarbazones containing a central pyridyl core display potent antimalarial activity in vitro. Sequestration and activation of ferric iron appears to play a significant role in this activity. Ongoing studies are aimed at further development of this series as potential antimalarials.

Keywords: Malaria, Plasmodium, thiosemicarbazone, metal coordination, iron, copper, reactive oxygen.

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Article Details

Year: 2019
Published on: 25 May, 2018
Page: [51 - 58]
Pages: 8
DOI: 10.2174/1573406414666180525132204

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