An ethnobotanical survey and inhibitory effects on NLRP3 inflammasomes/Caspase-1 of herbal recipes' extracts traditionally used in Rwanda for asthma treatment.
Tomani, Jean Claude Didelot; Gainkam, Lea Olive Tchouate; Nshutiyayesu, Samuelet al.
2018 • In Journal of Ethnopharmacology, 227, p. 29-40
[en] 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 200microg/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 50microg/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.
Disciplines :
Pharmacy, pharmacology & toxicology
Author, co-author :
Tomani, Jean Claude Didelot
Gainkam, Lea Olive Tchouate
Nshutiyayesu, Samuel
Mukazayire, Marie Jeanne
Ribeiro, Sofia Oliveira
Stevigny, Caroline
Frederich, Michel ; Université de Liège - ULiège > Département de pharmacie > Pharmacognosie
Muganga, Raymond
Souopgui, Jacob
Language :
English
Title :
An ethnobotanical survey and inhibitory effects on NLRP3 inflammasomes/Caspase-1 of herbal recipes' extracts traditionally used in Rwanda for asthma treatment.
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