New compounds that can work against drug-resistant malaria parasites have been discovered by a team of researchers.
Christine Hrycyna, Rowena Martin, Jean Chmielewski and colleagues point out that the parasite Plasmodium falciparum, which causes the most severe form of malaria, is found in nearly 100 countries that, all totaled, are home to about half of the world's population.
Every day, P. falciparum and its relatives hitch rides via mosquitoes to find a human home. An effective vaccine remains elusive and the continuing emergence of drug-resistant parasites is cause for alarm.
The good news is that these scientists have designed compounds that work against P. falciparum strains that are resistant to drugs such as chloroquine. The team wanted to understand how these compounds worked and to develop new candidate antimalarials.
In the lab, the scientists designed and tested a set of molecules called quinine dimers, which were effective against sensitive parasites, and, surprisingly, even more effective against resistant ones. he compounds have an additional killing effect on the drug-resistant parasites because the compounds bind to and block the resistance-conferring protein. This resensitizes the parasites to chloroquine, and appears to block the normal function of the resistance protein, killing the parasite.
The study was published in the journal ACS Chemical Biology.