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Antileishmanial ring-substituted ether phospholipids
Nikos Avlonitis1, Eleni Lekka, Anastasia Detsi
1Institute of Organic and Pharmaceutical Chemistry, National Hellenic Research Foundation, 48 Vassileos Constantinou Avenue, 11635 Athens, Greece.
Journal of Medicinal Chemistry
|February 21, 2003
Summary
New ether phospholipids were synthesized and tested against Leishmania parasites. Several analogues demonstrated superior or equivalent antileishmanial activity compared to miltefosine, with significant effects on model membrane properties.
Area of Science:
- Medicinal Chemistry
- Parasitology
- Physical Chemistry
Background:
- Leishmaniasis remains a significant global health concern, necessitating the development of novel therapeutic agents.
- Ether phospholipids represent a promising class of compounds with potential antileishmanial activity.
- Understanding the physicochemical properties of these compounds is crucial for optimizing their efficacy.
Purpose of the Study:
- To synthesize novel ring-substituted ether phospholipids with diverse headgroups and alkyl chains.
- To evaluate the in vitro antileishmanial activity of these synthesized compounds against Leishmania donovani and Leishmania infantum.
- To investigate the impact of these ether phospholipids on the physicochemical properties of model membranes using differential scanning calorimetry.
Main Methods:
- Chemical synthesis of three series of ether phospholipids with varying headgroups (N,N,N-trimethylammonium, N-methylpiperidino, N-methylmorpholino) and alkyl substituents.
- In vitro antileishmanial activity assay using a 3-(4,5-dimethylthiazol-2yl)-2,5-diphenyltetrazolium bromide) (MTT)-based microassay against promastigote forms of L. donovani and L. infantum.
- Differential scanning calorimetry (DSC) to analyze the thermotropic behavior of model membrane bilayers incorporating the synthesized ether phospholipids.
Main Results:
- Several synthesized ether phospholipid analogues exhibited potent antileishmanial activity against both L. donovani and L. infantum, outperforming the control drug miltefosine.
- Specific derivatives showed equipotent activity to miltefosine, while others demonstrated enhanced efficacy against one Leishmania species.
- Differential scanning calorimetry revealed that the more active antileishmanial compounds had a more pronounced effect on the thermotropic properties of model membrane bilayers compared to less active analogues.
Conclusions:
- The synthesized ring-substituted ether phospholipids represent a promising new class of antileishmanial agents.
- The observed correlation between antileishmanial activity and membrane perturbation suggests a potential mechanism of action.
- Further investigation into these compounds could lead to the development of more effective treatments for leishmaniasis.