title: Repurposing the open access malaria box to discover potent inhibitors of Toxoplasma gondii and Entamoeba histolytica.
abstract: Toxoplasmosis and amebiasis are important public health concerns worldwide. The drugs currently available to control these diseases have proven limitations. Therefore, innovative approaches should be adopted to identify and develop new leads from novel scaffolds exhibiting novel modes of action. In this paper, we describe results from the screening of compounds in the Medicines for Malaria Venture (MMV) open access Malaria Box in a search for new anti-Toxoplasma and anti-Entamoeba agents. Standard in vitro phenotypic screening procedures were adopted to assess their biological activities. Seven anti-Toxoplasma compounds with a 50% inhibitory concentration (IC50) of <5 μM and selectivity indexes (SI) of >6 were identified. The most interesting compound was MMV007791, a piperazine acetamide, which has an IC50 of 0.19 μM and a selectivity index of >157. Also, we identified two compounds, MMV666600 and MMV006861, with modest activities against Entamoeba histolytica, with IC50s of 10.66 μM and 15.58 μM, respectively. The anti-Toxoplasma compounds identified in this study belong to scaffold types different from those of currently used drugs, underscoring their novelty and potential as starting points for the development of new antitoxoplasmosis drugs with novel modes of action.
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon fabrice.boyom@fulbrightmail.org.
authors: Fabrice F
authors: FF
authors: Boyom
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Patrick V T
authors: PV
authors: Fokou
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon Institute of Medical Research and Medicinal Plants Studies (IMPM), Yaoundé, Cameroon.
authors: Lauve R Y
authors: LR
authors: Tchokouaha
authors: Medicines for Malaria Venture, Geneva, Switzerland.
authors: Thomas
authors: T
authors: Spangenberg
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Alvine N
authors: AN
authors: Mfopa
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Ruffin M T
authors: RM
authors: Kouipou
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Cedric J
authors: CJ
authors: Mbouna
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Valerie F Donkeng
authors: VF
authors: Donfack
authors: Antimicrobial Agents Unit, Laboratory for Phytobiochemistry and Medicinal Plants Studies, University of Yaoundé I, Yaoundé, Cameroon.
authors: Paul H A
authors: PH
authors: Zollo
mesh_terms: D000981:Antiprotozoal Agents / Q000494:pharmacology*; D004748:Entamoeba histolytica / Q000187:drug effects*; D021261:Parasitic Sensitivity Tests; D000077489:Piperazine; D010879:Piperazines / Q000494:pharmacology; D014122:Toxoplasma / Q000187:drug effects*
chemical_list: D000981:Antiprotozoal Agents; D010879:Piperazines; D000077489:Piperazine