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Numerous studies indicate that a key feature of chloroquine's (CQ) antimalarial activity is its interaction with hematin. We now characterize this CQ-hematin interaction in detail using isothermal titration calorimetry (ITC). Between pH 5.6 and 9.0, association constants (K a values) for enthalpy-driven CQ-hematin μ-oxo dimer binding fell in the narrow range of 2.3-4.4x10 5 M -...
The iron chelator deferoxamine enhances the clearance of Plasmodium falciparum parasitemia and may be useful in drug combinations for the treatment of cerebral malaria. However, the deferoxamine-chloroquine drug combination is antagonistic, or at best additive, against P. falciparum in vitro. As chloroquine is thought to exert its antimalarial activity by interacting with hematin released from the...
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