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One of the Indonesian medicinal plants, Cassia spectabilis is traditionally used to treat several diseases, including malaria. The quality of raw materials influences the quality of drug derived from a plant. Standardizing the raw materials followed by the antimalarial activity test are needed to azure the quality of product prepared from plants. The aim of this study was to standardize the quality of C. spectabilis leaves and to evaluate the antimalarial activities of ethyl acetate extract. The fresh material of C. spectabilis leaves was observed in its specific and non-specific parameters. In vitro test was done by using Plasmodium falciparum 3D7. In vivo test was done using a 4-day suppressive test method against mice infected with P. berghei for four consecutive days. Heme detoxification inhibitory activity test was carried out using the modified Basilico method. The leaves of C. spectabilis meet the quality requirement for raw materials of traditional medicine. The ethyl acetate extract showed in vitro antiplasmodial activity against P. falciparum 3D7 and in vivo antimalarial activity against P. berghei infection with an IC50 value of 27.28 μg/mL and ED50 value of 1.74 mg/kg, respectively. The extract also showed heme detoxification inhibitory activity with an IC50 value of 0.33±0.01 mg/mL. The leaves of C. spectabilis meet the quality requirement, and the ethyl acetate extract from standardized C. spectabilis leaves possessed a potential antimalarial activity that deserves to be further developed.

Background: We aimed to find out the allelic variation of Pfmsp-1 and Pfmsp-2 among gold miners in Central Kalimantan Province, Indonesia using parasites’ DNA isolated from archived RDT and GSBS Methods: This study was done using the samples collected between 2017-2020 from health centers in Subdistrict of Mihing Raya, Danau Rawah, and Bukit Hindu as well as Kapuas District Health Laboratory in Central Kalimantan Province, Surabaya, Indonesia. Parasites DNA were isolated from RDT cartridges and GSBS of local and migrant gold miners. Species of Plasmodium were confirmed by single step PCR. The allelic variation of Pfmsp-1 (K1, MAD20, RO33) and Pfmsp-2 (3D7, FC27) were analyzed by nested PCR. Results: Pfmsp-1 gene was found in only two (22.22%) out of 9 local samples, and 3 (27.27%) out of 11 migrant samples were found positive for K1 (150 bp) as well as MAD 20 (190 bp) allelic families. Pfmsp-2 gene were found in each one sample of 550 bp fragment in local (11.11%) and migrant samples (9.09%) for 3D7, and 2 samples of 300 bp fragments in local (22.22%) and 3 samples of 300 bp in migrant samples (27.27%). No difference in size and number of infections between both populations. The RO33 allelic family Alhamdulillah was not found in any sample. Conclusion: Low allelic variation of Pfmsp-1 and Pfmsp-2 genes with monogenotype indicated the low intensity of malaria transmission among gold miners in the studied areas. Further, the transmission may occur locally in the mining sites.

Introduction: Malaria is one of global health problems. Splenomegaly is one of malaria symptoms. Antimalarial drug resistance had been reported. Alternative treatment is by using traditional medicinal plants such as kelakai (Stenochlaena palustris). Kelakai contains alkaloid and flavonoid which had been reported to have antimalarial activity. The aim of this study was to discover antimalarial activity of ethanol extract of kelakai leaves to parasitemia and splenomegaly of Plasmodium berghei ANKA in infected BALB/c mice. Methods: This study was based on a modified Peter test using BALB/c mice infected with P. berghei ANKA treated with ethanol extract of kelakai leaves, with chloroquine diphosphate as a positive control. The negative control was P. berghei ANKA infected mice without any additional treatment. Administration of ethanol extract of kelakai leaves was performed for 4 days with a serial doses of 100, 10, and 1 mg/kg body weight. The positive control was given chloroquine diphosphate 20 mg/kg body weight. Parasitemia was observed daily prior to the calculation of the percentage of parasite growth and parasite growth inhibition. At the end of the test, the mice were sacrificed and spleens were isolated to measure their sizes. Probit analysis was performed to obtain ED50 to find the effect of extract in parasite killing by 50%. Spearman test was performed to analyze the correlation of doses of extract and splenomegaly. Results: Parasitemia growth inhibition was directly proportional to the dose. Higher parasitemia inhibition was obtained at higher doses and vice versa. Result of probit analysis showed an ED50 was 77.05 mg/kg body weight. Statistical analysis resulted in insignificant correlation between doses and splenomegaly p = 1.0 (significancy < 0.05). Conclusion: Ethanol extract of kelakai leaves possessed good antimalarial activity and there was no correlation between extract doses and splenomegaly in Plasmodium berghei ANKA-infected mice.

Malaria is a disease transmitted through the bite of a female Anopheles mosquito caused by the Plasmodium parasite. Plasmodium has been reported to become resistant to artemisinin. Thus, the study on the ethanol extract of mango parasite leaves/Dendrophthoe pentandra (MP) on P. berghei-infected BALB/c mice with and without artemisinin combination (MP+A) was conducted. This study is experimental laboratory research with a post-test only design. The percent parasitemia in mice treated with ethanol extract of MP and MP+A leaves decreased. There was no difference in the spleen index in mice given ethanol extract of MP, and MP+A leaves with p = 0.203 and the spleen weight of mice with p = 0.134 (significance: p

Malaria is a parasitic infectious disease that remains one of the focuses of world health problems. The ethanol extract of Hedyotis corymbosa has biochemical compounds potentially become a new antimalarial drug. This study aimed to analyze the effect of this extract on parasitemia and hepatomegaly in mice infected with Plasmodium berghei ANKA. Twentyfive BALB/c mice were infected with P. berghei ANKA and grouped into 5 groups. Group 1-3 were treated with 250 mg/Kg BW (HC250), 300 mg/Kg BW (HC300), and 350 mg/Kg BW (HC350) of ethanol extract of H. corymbosa (EEHC), respectively. Group 4 was a positive control (POS) which was given dihydroartemisisnin-piperaquin (DHP) and Group 5 was a negative control (NEG) which was only given CMC Na 1%. Treatments were given orally once a day for four consecutive days. Parasitemia was observed daily on Giemsa-stained tail blood smear. On day 5 the mice were sacrificed, blood were collected by cardiac punctured, the livers were removed and the length, width, and weight were measured. There was no significant difference on parasitemia between Group 1, 2, 3 and NEG. However, the highest inhibition of parasite s growth was found in Group 3 (61.4%. Observation on hepatomegaly, showed that a significant difference on the length of the liver was found between Group 3 and NEG.

Malaria-associated acute respiratory distress syndrome (MA-ARDS) is characterized by extensive infiltration of leukocytes, microhemorrhages, vasogenic edema, changes in lung color, and a significant increase in the weight of the lung. This study was aimed to find out the differences in parasitemia and lung size in MA-ARDSand non-MA-ARDSin mice infected with Plasmodium berghei ANKA. Sixteen male BALB/c mice were infected with P. berghei ANKA, and daily parasitemia was observed on Giemsa-stained tail blood smears. Mice were sacrificed when parasitemia reached ±20%. Simultaneously eight uninfected mice were used as negative control (NEG). The statistical analysis was done using Kruskal Wallis, Mann Whitney U tests, and Spearman correlation test. The results showed that there were significant differences in parasitemia (p=0.001), weight (p=0.001), and lung length (p=0.021) between the MA-ARDS and non-MA-ARDS groups. Comparison of NEG and MA-ARDS resulted in a significant difference in lung size (p=0.05). When non-MA-ARDScompared with NEG groups, it showed a significant difference in lung width (p=0.001). However, there was no significant difference in lung weight and length (p>0.05). Spearman correlation test showed that there was a strong correlation between parasitemia with weight (p=0.000), length (p=0.001), and lung width (p=0.017). The findings indicated that parasitemia played a role in the development of MA-ARDS in mice infected with P. berghei ANKA and influenced the size of the lung.

Currently, the presence of antimalarial drug resistance has become a major obstacle in the treatment of malaria. To overcome the problem, a series of studies are needed to find new antimalarial drugs from plants. Previously, 90% ethanolic extract of Cassia spectabilis DC (EECS) leaves have been reported to have antimalarial activity in vitro against Plasmodium falciparum and in vivo against Plasmodium berghei ANKA. The research is conducted to find out the toxicity and protective effects of EECS on the liver and kidneys of mice infected with P. berghei ANKA. The acute and subacute toxicity tests were carried out on healthy mice that were given EECS at a dose of 150 mg/kg BW. An antimalarial activity test was carried out at doses of 150 and 200 mg/kg BW in P. berghei-infected mice. Regarding hepatomegaly, further plasma levels of hepatic enzyme were analyzed, as well as histopathological observation of the liver to determine the effect of the extract on liver. The kidney was observed histopathologically as well. The acute toxicity test of EECS showed that there was no mouse died at the highest dose, indicating safe for the mice. The subacute toxicity based on the histology data showed no significant difference in the liver and kidney of mice between the tested group and the healthy group. The histological and enzymatic effect of EECS in mice infected with P. berghei showed the histological and enzymatic effect that improved liver function and the histopathological effect on kidneys with the highest activity at a dose of 200 mg/kg BW compared with the negative control. The results showed the EECS was not toxic in mice and repaired the liver and kidney functions of P. berghei ANKA-infected mice, indicating a good candidate for antimalarial drug development.