GHTM

Global Health and Tropical Medicine

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More than a half century of malaria research at IHMT

Malaria is a parasitic infection transmitted by Anopheles mosquitoes. Five species of the genus Plasmodium cause disease in humans: P. vivax, P. malariae, P. ovale, P. knowlesi e P. falciparum being the last, the one that causes most mortality and morbidity. During 1950s and early 1960s, the global eradication of malaria was believed possible, but the successively implemented eradication­programmes failed and eradication was achieved […]
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Quinolone-Hydroxyquinoline Tautomerism in Quinolone 3-Esters. Preserving the 4-Oxoquinoline Structure To Retain Antimalarial Activity

Recent publications report in vitro activity of quinolone 3-esters against the bc1 protein complex of Plasmodium falciparum and the parasite. Docking studies performed in silico at the yeast Qo site established a key role for the 4-oxo and N-H groups in drug-target interactions. Thus, the possibility of 4-oxoquinoline/4-hydroxyquinoline tautomerism may impact in pharmacologic profiles and […]
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Whole-cell SYBR Green I assay for antimalarial activity assessment

Malaria parasite growth assessment assays using nucleic acid dye SYBR GreenI are frequently compromised by high background readings due to haemoglobin and detergents in lysis buffer. Here, we have assessed and further validated an intact-cell SYBR Green I-based fluorescence assay (Cell-MSF) for antimalarial activity assessment even of highly fluorescent compounds. Our modifications include:
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Primaquine-based ionic liquids as a novel class of antimalarial hits

Ionic liquids derived from active pharmaceutical ingredients may open new perspectives towards low-cost rescuing of classical drugs. Thus, we have synthesized novel ionic liquids derived from the antimalarial drug primaquine, and evaluated them in vitro against three stages of malaria parasites. Results from this unprecedented approach open a new chapter in the history of antimalarial […]
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On the ordeal of quinolone preparation via cyclisation of aryl-enamines; Synthesis and structure of ethyl 6-methyl-7-iodo-4-(3-iodo-4-methylphenoxy)-quinoline-3-carboxylate

Recent studies directed to the design of compounds targeting the bc1 protein complex of Plasmodium falciparum, the parasite responsible for most lethal cases of malaria, identified quinolones (4-oxo-quinolines) with low nanomolar inhibitory activity against both the enzyme and infected erythrocytes. The 4-oxo-quinoline 3-ester chemotype emerged as a possible source of potent bc1 inhibitors, prompting us to expand the library of available […]
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About GHTM

GHTM is a R&D Unit that brings together researchers from IHMT with a track record in Tropical Medicine and International/Global Health. It aims at strengthening Portugal's role as a leading partner in the development and implementation of a global health research agenda. Our evidence-based interventions contribute to the promotion of equity in health and to improve the health of populations.

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