Mechanism of chloroquine resistance

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  1. NooK900 Well-Known Member

    Mechanism of chloroquine resistance


    Resistance to currently available antimalarial drugs has been confirmed in only two of the four human malaria parasite species, first developed independently in three to four areas in Southeast Asia, Oceania, and South America in the late 1950s and early 1960s. Since then, chloroquine resistance has spread to nearly all areas of the world where falciparum malaria is transmitted.

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    The clinical usefulness of chloroquine, and in some recent cases of quinine as well, has been much reduced by the evolution and spread of chloroquine resistant malaria parasites. The mechanism of resistance involves a reduced accumulation of the drug, although again the mechanism involved is controversial. Causes of resistance 12 3.1 Definition of antimalarial drug resistance 12 3.2 Malaria treatment failure 12 3.3 Mechanisms of antimalarial resistance 12 3.3.1 Chloroquine resistance 12 3.3.2 Antifolate combination drugs 13 3.3.3 Atovaquone 13 3.4 Factors contributing to the spread of resistance 13 3.4.1 Biological influences on resistance 13 Resistance to chloroquine has, however, steadily spread since the 1960s from two foci, one in South America and one in South East Asia. Throughout the 1980s, chloroquine resistance spread through Africa, the global heartland of malaria mortality and morbidity, and there are very few effective and affordable drugs to take its place.

    Although resistance to these drugs tends to be much less widespread geographically, in some areas of the world, the impact of multi-drug resistant malaria can be extensive. Has also developed resistance to nearly all of the other currently available antimalarial drugs, such as sulfadoxine/pyrimethamine, mefloquine, halofantrine, and quinine.

    Mechanism of chloroquine resistance

    On the Mechanism of Chloroquine Resistance in Plasmodium., Drug resistance in malaria - World Health Organization

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  6. Chloroquine is a 4-aminoquinoline with antimalarial, anti-inflammatory, and potential chemosensitization and radiosensitization activities. Although the mechanism is not well understood, chloroquine is shown to inhibit the parasitic enzyme heme polymerase that converts the toxic heme into non-toxic hemazoin, thereby resulting in the accumulation of toxic heme within the parasite.

    • Chloroquine C18H26ClN3 - PubChem.
    • Malaria Dissecting chloroquine resistance Current Biology.
    • Malaria Dissecting chloroquine resistance - ScienceDirect.

    A severe eye problem has happened with chloroquine. This may lead to lasting eyesight problems. The risk may be higher if you have some types of eye or kidney problems. The risk may also be higher with some doses of chloroquine, if you use chloroquine for longer than 5 years, or if you take certain other drugs like tamoxifen. Chloroquine-resistant Plasmodium falciparum accumulate significantly less chloroquine than susceptible parasites, and this is thought to be the basis of their resistance. However, the reason for the lower accumulation of chloroquine was unknown. The resistant parasite has now been found to release chloroquine 40 to 50 times more rapidly than the susceptible parasite, although their initial. Apr 02, 2019 Mechanism of Action. Chloroquine is an antimalarial agent. While the drug can inhibit certain enzymes, its effect is believed to result, at least in part, from its interaction with DNA. However, the mechanism of plasmodicidal action of chloroquine is not completely certain. Activity in vitro and in vivo

     
  7. HeavyHell New Member

    Hydroxychloroquine is used to prevent or treat malaria infections caused by mosquito bites. Plaquenil Uses, Dosage & Side Effects - The Risk of Retinal Toxicity with Plaquenil Protecting your eyesight when taking Plaquenil Lupus.
     
  8. INick Guest

    Plaquenil Uses, Dosage & Side Effects - Plaquenil hydroxychloroquine belongs to a group of medicines called quinolines. Plaquenil is used to treat or prevent malaria, a disease caused by parasites that enter the body through the bite of a mosquito. Malaria is common in areas such as Africa, South America, and Southern Asia. This medicine is not effective against all strains of malaria.

    Plaquenil 200mg Film-coated Tablets - Summary of Product.