Related Experiment Video
Updated: Jun 18, 2026
07:14
Ookluc: A Plasmodium berghei Line for Identifying Transmission-blocking Compounds
Published on: July 11, 2025
Original quinazoline derivatives displaying antiplasmodial properties
Youssef Kabri1, Nadine Azas, Aurélien Dumètre
1Laboratoire de Pharmacochimie Radicalaire, Faculté de Pharmacie, Universités d'Aix-Marseille I, II et III - UMR CNRS 6264, Laboratoire Chimie Provence, 27 Boulevard Jean Moulin, 13385 Marseille cedex 05, France.
European Journal of Medicinal Chemistry
|November 21, 2009
Summary
New quinazoline molecules show potent anti-malarial activity against resistant Plasmodium falciparum strains. These compounds exhibit low toxicity to human cells, indicating potential for developing novel malaria treatments.
Area of Science:
- Medicinal Chemistry
- Parasitology
- Drug Discovery
Background:
- Malaria remains a significant global health burden, driven by drug-resistant Plasmodium falciparum strains.
- Existing antimalarial drugs face challenges due to resistance and toxicity.
- Quinazoline derivatives represent a promising scaffold for novel therapeutic agents.
Purpose of the Study:
- To synthesize novel quinazoline-derived molecules.
- To evaluate their in vitro antiplasmodial activity against chloroquine-resistant Plasmodium falciparum.
- To assess their cytotoxicity and selectivity index against human cell lines.
Main Methods:
- Multistep synthesis of fourteen quinazoline-derived compounds.
- In vitro antiplasmodial assays using the W2 chloroquine-resistant Plasmodium falciparum strain.
- In vitro cytotoxicity assays on K652 and HepG2 human cell lines.
- Structure-activity relationship (SAR) analysis.
Main Results:
- Two synthesized quinazoline derivatives demonstrated significant antiplasmodial activity (IC50 = 0.95 and 1.3 microM).
- These compounds exhibited low cytotoxicity (IC50 > 100 or 125 microM) compared to chloroquine and doxycycline.
- The 6-nitro-2-(tosylmethyl)-N-(3-substituted-phenyl)-quinazolin-4-amine scaffold showed the most favorable profile.
- Hit compounds displayed selective activity against Plasmodium falciparum, with no significant activity against Leishmania donovani or Toxoplasma gondii.
Conclusions:
- Novel quinazoline derivatives possess potent and selective antiplasmodial activity.
- The identified compounds represent promising leads for the development of new antimalarial drugs.
- Further investigation into these quinazoline derivatives is warranted for malaria treatment.
Related Concept Videos
01:15Anthelminthic Agents
Anthelmintic drugs differ significantly from antiparasitic therapies targeting protozoa, primarily due to differences in parasite biology. Whereas most protozoal treatments act on proliferating cells, anthelmintics are typically directed against mature, nonproliferative helminths. The therapeutic approach considers the helminth's reliance on neuromuscular coordination, glucose metabolism, and microtubular integrity for survival, reproduction, and localization within the host. Most anthelmintics...
01:21Antiprotozoal Agents
Leishmaniasis is a widespread parasitic disease caused by several Leishmania species. It affects millions of people each year and remains a major public health problem in endemic regions. First-line treatment relies on pentavalent antimonials, including meglumine antimoniate and sodium stibogluconate. Even so, how these drugs work has not been fully clear, especially their interaction with parasite-specific biochemical pathways. One key target is trypanothione reductase (TR), an enzyme that...
01:22Antiviral Nucleoside Inhibitors
Antiviral Nucleoside InhibitorsAntiviral nucleoside inhibitors are structural analogs of natural nucleosides that interfere with viral DNA or RNA synthesis. These compounds selectively target viral polymerases due to their resemblance to host nucleosides, thereby disrupting viral genome replication.Mechanism of Acyclovir ActionAcyclovir is a guanosine analog with a three-carbon acyclic side chain. It selectively targets herpes simplex virus type 1 (HSV-1), herpes simplex virus type 2 (HSV-2),...
01:11Aryldiazonium Salts to Azo Dyes: Diazo Coupling
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para position.
01:15Antifungal Agents
Amphotericin B is a broad-spectrum antifungal agent that exploits structural differences between fungal and mammalian cell membranes. Its amphipathic structure—featuring a hydrophobic polyene-lactone ring and a hydrophilic region containing mycosamine and carboxylic acid groups—enables selective binding to ergosterol, a sterol predominantly found in fungal plasma membranes. This selective interaction underlies the drug’s antifungal activity, although weak binding to cholesterol contributes to...
01:28Inhibitors of Bacterial DNA Synthesis
Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These antibiotics are selectively...