In 1993, Malawi became the first African country to replace chloroquine with sulfadoxine-pyrimethamine nationwide in response to high rates of chloroquine-resistant falciparum malaria. To determine whether withdrawal of chloroquine can lead to the reemergence of chloroquine sensitivity, the prevalence of the pfcrt 76T molecular marker for chloroquine-resistant Plasmodium falciparum malaria was ...

Chloroquine-(14)C was used to study the processes which concentrate chloroquine in mouse red blood cells infected with chloroquine-sensitive or with chloroquine-resistant Plasmodium berghei. The initial rates of uptake and exchange of chloroquine-(14)C were both too fast to measure, yet large concentration gradients were maintained by the cells. When red blood cells were exposed to 10(-8)M chlo...

Glucose stimulates the high-affinity processes of chloroquine and amodiaquin accumulation in owl monkey erythrocytes infected with a chloroquine-susceptible strain of Plasmodium falciparum. Although these erythrocytes have greater ability to accumulate amodiaquin than chloroquine, glucose has relatively less effect on amodiaquin accumulation than on chloroquine accumulation. In contrast to thes...

The advent of chloroquine promising activity against the COVID-19 is novel and as such, it is imperative to thoroughly understand and determine the rate at which individual body systems handle the drug. Chloroquine a known antimalarial drug belongs to the chemical class of 4-aminoquinolines. The aim of the study was to analyze Chloroquine and its metabolite in biological fluids of healthy subje...

Chloroquine resistance in the malaria parasite Plasmodium falciparum has made malaria increasingly difficult to control. Chloroquine-resistant parasites accumulate less chloroquine than their chloroquine-sensitive counterparts; however, the mechanism underlying this remains unclear. The primary site of accumulation and antimalarial action of chloroquine is the internal acidic digestive vacuole ...

The saturable uptake of chloroquine by parasites of Plasmodium falciparum has been attributed to specific carrier-mediated transport of chloroquine. It is suggested that chloroquine is transported in exchange for protons by the parasite membrane Na+/H+ exchanger [J Biol Chem 272:2652-2658 (1997)]. Once inside the parasite, it is proposed that chloroquine inhibits the polymerization of hematin, ...

antimalarial drugs with the 4-aminoquinoline scaffold such as the important drugs, chloroquine (cq) and amodiaquine (aq), have been used to prevent and treat malaria for many years. the importance of these drugs is related to their simple usage, high efficacy, affordability, and cost-effectiveness of their synthesis. in recent years, with the spread of parasite resistance to cq and cross-resist...