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Effect of antimalarial drugs on plasmodia cell-free protein synthesis
Ana Ferreras1, Ledia Triana, Erlinda Sánchez
1Centro de Investigaciones Biomédicas, Facultad de Ciencias de la Salud, Universidad de Carabobo-Núcleo Aragua, Aragua, Venezuela.
Abstract:
A cell-free system from Plasmodium falciparum able to translate endogenous mRNA was used to determine the effect of artemisinin, chloroquine and primaquine on the protein synthesis mechanism of the parasite. The antimalarial drugs did not inhibit the incorporation of [3H] methionine into parasite proteins even at concentrations higher than the ones found to strongly inhibit the parasite growth. Results clearly indicate that these compounds do not have a direct effect on protein synthesis activity of P. falciparum coded by endogenous mRNA.
Insights
Antimalarial drugs like artemisinin, chloroquine, and primaquine do not directly inhibit protein synthesis in Plasmodium falciparum. This study used a cell-free system to show these drugs do not affect parasite protein production, even at high concentrations.
Area of Science:
- Parasitology
- Molecular Biology
- Pharmacology
Background:
- Plasmodium falciparum is the deadliest malaria parasite.
- Antimalarial drugs are crucial for malaria treatment.
- The precise mechanisms of action for some antimalarials are not fully understood.
Purpose of the Study:
- To investigate the direct impact of artemisinin, chloroquine, and primaquine on Plasmodium falciparum protein synthesis.
- To determine if these drugs affect the translation of endogenous mRNA in the parasite.
Main Methods:
- Utilized a cell-free system derived from Plasmodium falciparum.
- Measured the incorporation of [3H] methionine into parasite proteins.
- Assessed drug effects at concentrations exceeding those that inhibit parasite growth.
Main Results:
- Artemisinin, chloroquine, and primaquine did not inhibit [3H] methionine incorporation into parasite proteins.
- No direct effect on protein synthesis was observed, even at high drug concentrations.
- The protein synthesis activity of P. falciparum, as directed by endogenous mRNA, remained unaffected.
Conclusions:
- The studied antimalarial drugs do not exert their antiparasitic effect by directly inhibiting protein synthesis in Plasmodium falciparum.
- Alternative mechanisms of action for these drugs should be considered.
- This finding contributes to understanding antimalarial drug resistance and development.