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New effective, economical and safe antimalarial drugs are urgently needed due to the development of multi-drug-resistant strains of the parasite. Homeopathy uses ultra-diluted doses of various substances to stimulate autoregulatory and self-healing processes to cure various ailments. The aim of the study was to evaluate the in vitro and in vivo antimalarial efficacy of a homeopathic drug, Chininum sulphuricum 30C.In vitro antiplasmodial activity was screened against the P. falciparum chloroquine-sensitive (3D7) strain, and cell viability was assessed against normal human dermal fibroblasts and HepG2 cells. Suppressive, preventive and curative studies were carried out against P. berghei-infected mice in vivo.Chininum sulphuricum (30C) revealed good antiplasmodial activity in vitro, with 92.79 ± 6.93% inhibition against the 3D7 strain. The cell viability was 83.6 ± 0.6% against normal human dermal fibroblasts and 95.22 ± 5.1% against HepG2 cells. It also exhibited suppressive efficacy with 95.56% chemosuppression on day 7 with no mortality throughout the follow-up period of 28 days. It also showed preventive activity against the disease. Drug treatment was also safe to the liver and kidney function of the host as evidenced by biochemical studies.Chininum sulphuricum 30C exhibited considerable antimalarial activity along with safety to the liver and kidney function of the host.Hintergrund: Es besteht dringender Bedarf an neuen wirkungsvollen, ökonomischen und sicheren Malariamedikamenten angesichts der Entwicklung multiresistenter Stämme des Parasiten. In der Homöopathie werden hochverdünnte Dosen verschiedener Substanzen eingesetzt, um selbstregulierende und selbstheilende Prozesse zur Heilung verschiedener Leiden anzustoßen. Das Ziel dieser Studie war es, die Wirksamkeit des homöopathischen Präparats Chininum sulfuricum 30C gegen Malaria in vitro und in vivo zu beurteilen. Methoden: Die antiplasmodiale Aktivität in vitro wurde an P. falciparum, chloroquinsensitiver Stamm (3D7) getestet, und die Zellvitalität wurde bei normalen humanen Dermis-Fibroblasten sowie HepG2-Zellen untersucht. In vivo wurden suppressive, präventive und kurative Studien bei P.-berghei-infizierten Mäusen durchgeführt. Ergebnisse: Chininum sulfuricum (30C) zeigte in vitro gute antiplasmodiale Aktivitätmit 92,79 ± 6,93% Inhibition des 3D7-Stamms. Die Zellvitalität lag bei 83,6 ± 0,6% bei normalen humanen dermalen Fibroblasten bzw. 95,22 ± 5,1% bei HepG2-Zellen.Außerdem zeigte das Präparat suppressive Wirksamkeit mit 95,56% Chemosuppression an Tag 7 ohne Mortalität im gesamten Nachbeobachtungszeitraum von 28 Tagen. Auch zeigte es präventive Wirksamkeit gegen die Krankheit. Die Behandlung war dabei sicher in Bezug auf die Leber- und Nierenfunktion des Wirts, wie biochemische Studien belegen. Schlussfolgerung: Chininum sulfuricum 30C zeigte erhebliche Aktivität gegen die Malariainfektion und war dabei sicher in Bezug auf die Leber- und Nierenfunktion des Wirts.

Background and objectives: The emergence of multi-drug resistant (MDR) strains of Plasmodium falciparum highlights the need to develop novel antimalarial drugs. Present study explores the in vivo antiplasmodial activity of ethanol leaf extract of Thalictrum foliolosum (ELETF) against lethal murine malaria. Methods: The acute toxicity of the extract was assessed by Limit test of Lorke. The suppressive activity of the extract was evaluated by Peter’s 4 day test. In vivo preventive and curative activity of ELETF was assessed by Peter’s method and Ryley and Peter’s method respectively. Biochemical assays were carried out using standard methods. Results: ELETF (1000 mg/kg) exhibited considerable in vivo schizontocidal activity with 67.11% chemosuppression on Day 5. The ED50 of the extract was 579.56 mg/kg. ELETF also showed significant repository activity with 87.70% chemosuppression at 750 mg/kg, which was greater than pyrimethamine (78.78%). ELETF exhibited dose dependent chemosuppression in the curative test with maximum 70.06% chemosuppression (750 mg/kg). Maximum Mean Survival Time (MST) was 19.2±4.60 and 22.66±4.41 days respectively in the suppressive and curative test, which was extremely statistically significant (p

Ethnopharmacological relevance The increasing resistant cases even against artemisinin-based combination therapy have necessitated the need to develop new antimalarials. Phytomedicinal therapy is a benchmark for malaria in the Himalayan region. As the dialect and traditional variations have been seen along with this, usage of medicinal plant, its portion (shoot and root system) and mode of preparation also varies. There is no scientific evidence available for illustrating the antiplasmodial activity of the rhizomes of Bergenia ciliata (Saxifragaceae), which is known to be an antipyretic (fever akin to malaria), hepato-protective, and also for spleen enlargement. Aim of the study The present study evaluates the antimalarial activity of ethanol extract of B. ciliata rhizomes (EREBC). Materials and methods HPTLC was performed to identify and quantify three marker compounds in EREBC. The in vitro antimalarial activity was evaluated by schizont maturation inhibition assay. MTT assay was employed to test the cytotoxicity of EREBC. Peter's 4-day test and Peters method was employed to discern the suppressive and preventive activity of the extract respectively. Results HPTLC analysis revealed the presence of bergenin, epicatechin and gallic acid in the extract. EREBC exhibited considerable inhibition (IC50 1000 μg/mL). The selectivity index was > 200 for both strains. Acute toxicity of EREBC was > 4 g/kg. EREBC exhibited considerable in vivo suppressive activity with 96.48% inhibition at 500 mg/kg in comparison to chloroquine (96.08%). The ED50 of the extract was Conclusion Overall, the study illustrates the marked efficacy and potential of EREBC as an antimalarial agent with bergenin, epicatechin and gallic acid its major constituents, which played a pivotal role in the generation of the immune response.

The difficulty of developing an efficient malaria vaccine along with increasing spread of multidrug resistant strain of Plasmodium falciparum to the available antimalarial drugs poses the need to discover safe and efficacious antimalarial drugs to control malaria. An alternative strategy is to synthesize compounds possessing structures similar to the active natural products or marketed drugs. Several biologically active natural products and drugs contain β-carboline moiety. In the present study, few selected β-carboline derivatives have been synthesized and tested for their in vitro and in vivo antiplasmodial activity against the rodent malaria parasite Plasmodium berghei (NK-65). The designed analogs exhibited considerable in vitro antimalarial activity. Two compounds (1R,3S)-methyl 1-(benzo[d][1,3]dioxol-5-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate (9a) and (1R,3S)-methyl 1-(pyridin-3-yl)-2,3,4,9-tetrahydro-1H-pyrido[3,4-b]indole-3-carboxylate (9b) were further selected for in vivo studies. Both the lead compounds (9a and 9b) were observed to be safe for oral administration. The therapeutic effective dose (ED50) for 9a and 9b were determined and in the animal model, 9a (at 50 mg/kg dose) exhibited better activity in terms of parasite clearance and enhancement of host survival. Biochemical investigations also point toward the safety of the compound to the hepatic and renal functions of the rodent host. Further studies are underway to explore its activity alone as well as in combination therapy with artesunate against the human malaria parasite P. falciparum.

Background: Investigation of traditionally used medicinal plants can provide safe and cost effective good antimalarials. The present study explores the in vitro antimalarial potential of Thalictrum foliolosum (meadow rue) leaf extract against Plasmodium falciparum. Methods: Phytochemical screening of the extract was carried out following standardized methods. WHO method based on schizont maturation inhibition was employed to assess the in vitro antiplasmodial activity of plant extract. Colorimetric MTT assay was used to evaluate the in vitro cytotoxicity of Thalictrum foliolosum. Selectivity Index was also calculated. Results: Phytochemical screening of the extract revealed presence of alkaloids, phenols, triterpenes, saponins and phytosterols. Ethanolic leaf extract of Thalictrum foliolosum (ELETF) exhibited IC50 1000μg/ml against both HeLa cells and normal fibroblasts. Selectivity index of ELETF was calculated to be >200 and =169.7 respectively for chloroquine resistant (RKL-9) and sensitive (MRC-2) strains of the parasite. Conclusions: Based on WHO recommendations ELETF can be classified as highly active antimalarial against CQ-resistant strain and possesses promising activity against CQ-sensitive strain. The high selectivity index (SI>10) also establishes Thalictrum foliolosum as an active antimalarial against both the strains of Plasmodium falciparum.

Filamentous sulfur-oxidizing bacteria and geochemical parameters of sediments at the Makran accretionary wedge in the northeastern Arabian Sea off Pakistan were studied. The upper continental slope between 350 and 850 m water depth, which is in the center of the oxygen-minimum zone, is characterized by numerous sites of small-scale seeps of methane- and sulfide-charged porewater. White bacterial mats with diameters

The emergence of resistance against most of the drugs in current use against malaria has aggravated the disease burden in endemic regions. Several plants species have been used for treatment of malaria in traditional/cultural health systems. Bergenia ciliata, used traditionally for treatment of fever by local communities in the Himalayan Region, was evaluated for its plausible role as an antimalarial. Phytochemical screening of the ethanolic leaf extract of B. ciliata (ELEBC) revealed the presence of phenols, flavonoids, steroids and diterpenes. The extract showed good in vitro antiplasmodial activity, with an IC5010 μg/ml. Acute toxicity of the extract was observed to be5 g/kg, which is considered toxicologically safe for oral administration. When tested in vivo, different concentrations of the extract (250 to 1,000 mg/kg) exhibited considerable chemosuppression on day 7, in a dose-dependent manner. Maximum chemosuppression was observed to be 87.50% at 1,000 mg/kg. Administration of ELEBC (750 and 1,000 mg/kg) significantly (p 0.0005) enhanced the mean survival time of mice in comparison to infected control, which exhibited a mean survival time of 8.6 ± 1.5 days. Study reports presence of considerable in vitro and in vivo antimalarial activity in ethanolic leaf extract of B. ciliata for first time. Hence, the ethnopharmacological usage of the plant for treating fever is confirmed with experimental evidence.

BACKGROUND Malaria remains a major global health concern in developing regions of the world. Homeopathy, a holistic system of medicine, has a lot to offer in protecting against malaria. METHODS In the present study, antimalarial efficacy of combination of two homeopathic drugs Chelidonium 30 and nosode 30 has been evaluated in vivo against Plasmodium berghei (P. berghei) infection using Peters 4-day test. Biochemical assays have been performed to assess the levels of hepatic and renal function biomarkers upon drug treatment using diagnostic kits. RESULTS The combination of the drugs demonstrated considerable in vivo antimalarial activity with chemosuppression of 91.45% on day 7. The combination also significantly (p < 0.0005) enhanced the mean survival time of mice which was calculated to be 22.5 ± 6.31 days, whereas it was 8.55 ± 0.83 days in infected control. The increase in levels of the liver function marker enzymes tested in serum of treated mice were significantly less (p < 0.0005) than those observed in infected control on day 10. The serum urea and creatinine used for assessment of renal sufficiency were slightly elevated above normal, but were statistically significant (p < 0.0005) as compared to infected control. CONCLUSIONS The study establishes the effectiveness of the combination against P. berghei in vivo along with the safety of the drugs to the liver and kidney functions of the host.

Background & objectives: Albizia lebbeck Benth. (Leguminosae) has long been used in Indian traditional medicine. The current study was designed to test antimalarial activity of ethanolic bark extract of A. lebbeck (EBEAL). Methods: EBEAL was prepared by soxhlet extraction and subjected to phytochemical analysis. The extract was evaluated for its in vitro antimalarial activity against Plasmodium falciparum chloroquine (CQ) sensitive (MRC2) and CQ resistant (RKL9) strains. Cytotoxicity (CC 50 ) of extract against HeLa cells was evaluated. Median lethal dose (LD 50 ) was determined to assess safety of EBEAL in BALB/c mice. Schizonticidal (100-1000 mg/kg) and preventive (100-750 mg/kg) activities of EBEAL were evaluated against P. berghei. Curative activity (100-750 mg/kg) of extract was also evaluated. Results: Phytochemical screening revealed presence of alkaloids, flavonoids, phenols, saponins, terpenes and phytosterols. The extract exhibited IC 50 of 8.2 µg/ml (MRC2) and 5.1 µg/ml (RKL9). CC 50 of extract on HeLa cell line was calculated to be >1000 µg/ml. EBEAL showed selectivity indices (SI) of >121.9 and >196.07 against MRC2 and RKL9 strains of P. falciparum, respectively. LD 50 of EBEAL was observed to be >5 g/kg. Dose-dependent chemosuppression was observed with significant ( p100 mg/kg. Significant (P