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Selenium-induced apoptosis-like cell death in Plasmodium falciparum
Eka W Suradji1, Toshimitsu Hatabu2, Kenji Kobayashi1
1Department of Public Health, Gunma University, Graduate School of Medicine, 3-39-22 Showa-machi, Maebashi, Gunma 371-8511, Japan.
Parasitology
|August 23, 2011
Summary
Several selenium compounds show anti-malarial effects against Plasmodium falciparum by inducing apoptosis-like cell death. This discovery offers a potential new strategy against drug-resistant malaria.
Area of Science:
- Medicinal Chemistry
- Parasitology
- Biochemistry
Background:
- Plasmodium falciparum malaria poses a significant global health challenge, exacerbated by increasing drug resistance.
- Existing anti-malarial drugs are becoming less effective, necessitating the urgent development of novel therapeutic agents.
- Selenium (Se), an essential trace element, has shown preliminary anti-plasmodial activity, but its mechanism remains largely unelucidated.
Purpose of the Study:
- To investigate the in vitro anti-plasmodial effects of various selenium compounds against Plasmodium falciparum.
- To elucidate the mechanism of action, focusing on apoptosis-inducing activity.
- To determine the structure-activity relationship of different selenium chemical forms regarding anti-malarial efficacy.
Main Methods:
- In vitro screening of several selenium compounds for anti-plasmodial activity against P. falciparum.
- Assessment of apoptosis-inducing activity through morphological observation, DNA fragmentation assays, and mitochondrial function analysis.
- Determination of 50% inhibition concentration (IC50) values for effective compounds.
Main Results:
- Selenite (SeO32-), methylseleninic acid, selenomethionine, and selenocystine demonstrated significant anti-plasmodial effects with IC50 values of 9, 10, 45, and 65 μm, respectively.
- Selenate and methylselenocysteine showed no significant effect on parasite growth up to 100 μm.
- Effective selenium compounds induced parasite shrinkage, pyknosis, and significant mitochondrial damage, indicative of apoptosis-like cell death.
Conclusions:
- Selenite, methylseleninic acid, selenomethionine, and selenocystine possess anti-plasmodial activities mediated by the induction of apoptosis-like cell death in P. falciparum.
- The anti-plasmodial efficacy of selenium is dependent on its chemical form.
- The identified apoptosis-like cell death pathway presents a promising avenue for combating drug-resistant malaria strains.
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