Abstract
Pronase treatment of mouse red cells in the presence of chloroquine leads to greatly enhanced accumulation of the drug, which after freeze-thaw or hypotonic lysis is found to be located mainly in the membrane fraction. Much lower proportions of the drug are found in the membrane fraction prepared from Plasmodium berghei-infected red cells, which also have a high capacity for chloroquine accumulation. Pronase treatment of infected cells result only in a slight enhancement of total accumulation. The membrane-bound fraction of the drug is, however, increased while the fraction in the lysate is decreased. Membranes prepared from hypotonic lysis of normal or P. berghei-infected cells have similar capacities for chloroquine binding. These results show that the distribution of chloroquine in pronase-treated and malaria-infected cells are different and that pronase treatment of both normal and infected cells followed by lysis leads to availability of potential membrane binding sites.
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