Evaluation of Senna singueana leaf extract as an alternative or adjuvant therapy for malaria

10.1016/j.jtcme.2014.11.014

Mebrahtom Gebrelibanos Hiben；Gereziher Gebremedhin Sibhat；Biruk Sintayehu Fanta；Haile Desta Gebrezgi；Shewaye Belay Tesema

adjuvant ； antimalarial ； in vivo ； Plasmodium berghei ； Senna singueana

Journal of Traditional and Complementary Medicine

6卷1期（2016 / 01 / 01）

88 - 93

英文

The emergence of malarial resistance to most antimalarial drugs is the main factor driving the continued effort to identify/discover new agents for combating the disease. Moreover, the unacceptably high mortality rate in severe malaria has led to the consideration of adjuvant therapies. Senna singueana leaves are traditionally used against malaria and fever. Extracts from the leaves of this plant demonstrated in vitro and in vivo antioxidant activities, which in turn could reduce the severity of malaria. Extracts from the root bark of this plant exhibited antiplasmodial activity; however, the leaves are the more sustainable resource. Thus, S. singueana leaf was selected for in vivo evaluation as a potential alternative or adjuvant therapy for malaria. Using malaria [Plasmodium berghei ANKA, chloroquine (CQ) sensitive]-infected Swiss albino mice of both sexes, 70% ethanol extract of S. singueana leaves (alone and in combination with CQ) was tested for antimalarial activity and adjuvancy potential. The 4-day suppressive test was used to evaluate antimalarial activity. The dose of S. singueana extract administered was safe to mice and exhibited some parasite suppression effect: extract doses of 200 mg/kg/d, 400 mg/kg/d, and 800 mg/kg/d caused 34.54%, 44.52%, and 47.32% parasite suppression, respectively. Concurrent administration of the extract with CQ phosphate at varied dose levels indicated that the percentage of parasite suppression of this combination was higher than administering CQ alone, but less than the sum of the effects of the extract and CQ acting separately. In conclusion, the study indicated that 70% ethanol extract of S. singueana leaf was safe to mice and possessed some parasite suppression effect. Coadmin-istration of the extract with CQ appeared to boost the overall antimalarial effect, indicating that the combination may have a net health benefit if used as an adjuvant therapy.

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