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• W2247293437 abstract "Abstract Mammalian plasma contains a high-affinity actin-binding protein, plasma gelsolin, that severs actin filaments. Destruction of erythrocytes could result in the release of erythrocyte cytoskeletal actin into the plasma where it could bind to gelsolin. If the clearance of actin- gelsolin complexes exceeds its synthesis, lowering of the plasma gelsolin concentration might follow. To test this hypothesis, we measured plasma gelsolin levels in patients with falciparum malaria, a disease where at least part of the hemolysis takes place in the intravascular space and that is usually not accompanied by dysfunction of other organs. Two functional gelsolin assays showed that the mean plasma gelsolin concentration of 18 Nigerian children with Plasmodium falciparum malaria was less than 50% (P less than .001) of healthy Nigerian control subjects tested at the same time. Patients with pneumonia and febrile seizures also had depressed gelsolin levels, which indicates that factors other than hemolysis can lower gelsolin concentrations. Gelsolin levels were measured in 11 patients from The Gambia with P falciparum malaria before and approximately 3 weeks after treatment. In all cases the gelsolin level increased after treatment. To confirm the hypothesis that hemolysis can result in a lowering of plasma gelsolin levels, hemolysis was induced in rabbits, either acutely (by the injection of human serum) or subacutely (by the administration of phenylhydrazine). A fall in plasma gelsolin levels was seen, the rate of fall differing with the extent of hemolysis. Affinity adsorption of plasma from animals undergoing acute hemolysis with Sepharose beads coupled to the actin-binding protein DNase I, followed by immunoblotting of adherent proteins with antiactin antiserum demonstrated the presence of actin in circulating rabbit plasma. These studies suggest that under some conditions components of the red cell cytoskeleton are exposed to plasma proteins and that accelerated clearance of actin-gelsolin complexes may explain in part the depressed plasma gelsolin levels seen in patients with falciparum malaria." @default.
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• W2247293437 date "1988-07-01" @default.
• W2247293437 modified "2023-09-27" @default.
• W2247293437 title "Decreased plasma gelsolin levels in patients with Plasmodium falciparum malaria: a consequence of hemolysis?" @default.
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• W2247293437 doi "https://doi.org/10.1182/blood.v72.1.214.214" @default.
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