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Sci Rep ; 11(1): 2121, 2021 01 22.
Artigo em Inglês | MEDLINE | ID: mdl-33483532

RESUMO

The spread of Plasmodium falciparum parasites resistant to most first-line antimalarials creates an imperative to enrich the drug discovery pipeline, preferably with curative compounds that can also act prophylactically. We report a phenotypic quantitative high-throughput screen (qHTS), based on concentration-response curves, which was designed to identify compounds active against Plasmodium liver and asexual blood stage parasites. Our qHTS screened over 450,000 compounds, tested across a range of 5 to 11 concentrations, for activity against Plasmodium falciparum asexual blood stages. Active compounds were then filtered for unique structures and drug-like properties and subsequently screened in a P. berghei liver stage assay to identify novel dual-active antiplasmodial chemotypes. Hits from thiadiazine and pyrimidine azepine chemotypes were subsequently prioritized for resistance selection studies, yielding distinct mutations in P. falciparum cytochrome b, a validated antimalarial drug target. The thiadiazine chemotype was subjected to an initial medicinal chemistry campaign, yielding a metabolically stable analog with sub-micromolar potency. Our qHTS methodology and resulting dataset provides a large-scale resource to investigate Plasmodium liver and asexual blood stage parasite biology and inform further research to develop novel chemotypes as causal prophylactic antimalarials.


Assuntos
Antimaláricos/farmacologia , Ensaios de Triagem em Larga Escala/métodos , Fígado/efeitos dos fármacos , Malária Falciparum/tratamento farmacológico , Plasmodium falciparum/efeitos dos fármacos , Antimaláricos/química , Avaliação Pré-Clínica de Medicamentos/métodos , Células Hep G2 , Humanos , Fígado/parasitologia , Malária Falciparum/sangue , Malária Falciparum/parasitologia , Estrutura Molecular , Testes de Sensibilidade Parasitária , Plasmodium berghei/efeitos dos fármacos , Plasmodium berghei/fisiologia , Plasmodium falciparum/genética , Plasmodium falciparum/fisiologia , Substâncias Protetoras/química , Substâncias Protetoras/farmacologia , Reprodutibilidade dos Testes , Relação Estrutura-Atividade , Tiadiazinas/química , Tiadiazinas/farmacologia
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