Objective To compare the schizontocidal activity of recrystallized or crude daphnetin against malaria parasites in vivo. Methods Schizontocidal activity of recrystallized or crude daphnetin at various dosages was a...Objective To compare the schizontocidal activity of recrystallized or crude daphnetin against malaria parasites in vivo. Methods Schizontocidal activity of recrystallized or crude daphnetin at various dosages was assessed in mice infected with Plasmodium berghei ANKA using a 4-day suppress assay. Results The comparison of the reduction rate of parasitemia caused by either recrystallized or crude dephnetin showed that ED50 of crude daphnetin was 18.36 mg/kg, with 95% confidence limit of 5.96-56.54 mg/kg while ED50 of recrystallized daphnetin was 11.46 mg/kg, with 95% confidence limit of 8.63-15.22 mg/kg. Conclution The results indicate that the efficacy of recrystallized daphnetin is 37.6% higher than that of crude daphnetin.展开更多
This paper presents an in-host malaria model subject to anti-malarial drug treatment and malaria vaccine antigens combinations.Pontryagin's Maximum Principle is applied to establish optimal control strategies agai...This paper presents an in-host malaria model subject to anti-malarial drug treatment and malaria vaccine antigens combinations.Pontryagin's Maximum Principle is applied to establish optimal control strategies against infected erythrocytes,infected hepatocytes and malaria parasites.Results from numerical simulation reveal that a combination of preerythrocytic vaccine antigen,blood schizontocide and gametocytocide drugs would offer the best strategy to eradicate clinical P.falciparum malaria.Sensitivity analysis,further reveal that the efficacy of blood schizontocides and blood stage vaccines are crucial in the control of clinical malaria infection.Futhermore,we found that an effective blood schizontocide should be used alongside efficacious blood stage vaccine for rapid eradication of infective malaria parasites.The authors hope that the results of this study will help accelerate malaria elimination efforts by combining malaria vaccines and anti-malarial drugs against the deadly P.falciparum malaria.展开更多
基金This work was supported by grants from the National Natural Science Foundation of China (No. 39970669) and Artemisinin Science Foundation.
文摘Objective To compare the schizontocidal activity of recrystallized or crude daphnetin against malaria parasites in vivo. Methods Schizontocidal activity of recrystallized or crude daphnetin at various dosages was assessed in mice infected with Plasmodium berghei ANKA using a 4-day suppress assay. Results The comparison of the reduction rate of parasitemia caused by either recrystallized or crude dephnetin showed that ED50 of crude daphnetin was 18.36 mg/kg, with 95% confidence limit of 5.96-56.54 mg/kg while ED50 of recrystallized daphnetin was 11.46 mg/kg, with 95% confidence limit of 8.63-15.22 mg/kg. Conclution The results indicate that the efficacy of recrystallized daphnetin is 37.6% higher than that of crude daphnetin.
文摘This paper presents an in-host malaria model subject to anti-malarial drug treatment and malaria vaccine antigens combinations.Pontryagin's Maximum Principle is applied to establish optimal control strategies against infected erythrocytes,infected hepatocytes and malaria parasites.Results from numerical simulation reveal that a combination of preerythrocytic vaccine antigen,blood schizontocide and gametocytocide drugs would offer the best strategy to eradicate clinical P.falciparum malaria.Sensitivity analysis,further reveal that the efficacy of blood schizontocides and blood stage vaccines are crucial in the control of clinical malaria infection.Futhermore,we found that an effective blood schizontocide should be used alongside efficacious blood stage vaccine for rapid eradication of infective malaria parasites.The authors hope that the results of this study will help accelerate malaria elimination efforts by combining malaria vaccines and anti-malarial drugs against the deadly P.falciparum malaria.
