1. An ethnobotanical survey and inhibitory effects on NLRP3 inflammasomes/Caspase-1 of herbal recipes' extracts traditionally used in Rwanda for asthma treatment.
- Author
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Tomani, Jean Claude Didelot, Gainkam, Lea Olive Tchouate, Nshutiyayesu, Samuel, Mukazayire, Marie Jeanne, Ribeiro, Sofia Oliveira, Stevigny, Caroline, Frederich, Michel, Muganga, Raymond, and Souopgui, Jacob
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ASTHMA prevention , *ALTERNATIVE medicine , *ANTI-inflammatory agents , *BIOLOGICAL assay , *DOSE-effect relationship in pharmacology , *DRUG toxicity , *ENZYME inhibitors , *HERBAL medicine , *MACROPHAGES , *MEDICINAL plants , *PLANT extracts , *DESCRIPTIVE statistics , *IN vitro studies , *PHARMACODYNAMICS - Abstract
Abstract Ethnopharmacological relevance Respiratory diseases and asthma, in particular, are nowadays a global health problem. In Rwanda, some traditional healers claim to treat asthma with plant-based recipes, though there is no scientific proof so far. Aim of the study Our study aimed at evaluating the toxicity and the anti-inflammatory effect of plant recipes used in Rwanda against asthma in order to select potential candidates for further characterization of the active compounds. Materials and methods Water (aqueous) and methanol-dichloromethane (organic) extracts from selected folkloric recipes were submitted for toxicity test on THP-1 derived macrophages using CellTiter-Glo Luminescent Cell Viability Assay. The evaluation of the anti-inflammatory effect of the plant extracts was carried out using the Caspase-Glo 1 Inflammasome assay on THP-1 -derived macrophages. Results Most of both organic and aqueous extract showed more than 95% of cell viability up to 200 µg/ml, except for R03Cn organic extract that inhibited 25% of the cell viability. Plant extracts inhibited caspase-1 activation in THP-1 derived macrophages in a dose-dependent manner. Four extracts (R03Cn and R07Kn aqueous extracts, R10MK and R19Sz organic extracts) strongly downregulated the activation of caspase-1 (more than 70% at 50 µg/ml). In general, organic extracts exhibited better caspase-1 inhibitory effects than their aqueous counterparts. Conclusions The inhibition of inflammasome/caspase-1 is one of key mechanisms of action in asthma. Some traditional recipes are active on this mechanism and are thus strong candidates for the treatment of asthma and other inflammasome-mediated diseases. Further investigations are needed to characterize active molecules. Graphical abstract fx1 [ABSTRACT FROM AUTHOR]
- Published
- 2018
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