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• W2086931489 abstract "Heterozygous thalassemia and sickle cell disease produce mild hematological symptoms but provide protection against malaria mortality and severe malaria symptoms. Two explanations for resistance are considered in the literature - impaired growth of the parasite or enhanced removal by the host immune cells. A critical overview of studies that connect malaria resistance with impaired intra-erythrocytic growth is presented. All studies are fraught with two kinds of bias. The first one resides in the impossibility of reproducing the in vivo situation in the simplified model in vitro. The second stems from the generalized use of RPMI 1640 culture medium. RPMI 1640 has critically low levels of several amino acids; is devoid of hypoxanthine (essential for parasite growth) and adenine; and is low in reduced glutathione. Analysis of representative studies indicates that impaired parasite growth in heterozygous red blood cells (RBCs) may derive from nutrient limitations and, therefore, possibly be of artefactual origin. This conclusion seems plausible because studies were performed with RPMI 1640 medium at relatively high hematocrit and for prolonged periods of time. Mutations considered are particularly sensitive to nutrient deprivation because they have higher metabolic demands due to permanent oxidant stress related to unpaired globin chains, sickle hemoglobin and high levels of membrane-free iron. In addition, non-parasitized AS- and thalassemic-RBCs are dehydrated and microcytic. Thus, the number of metabolically active elements per unit of blood volume is remarkably larger in mutant RBCs compared to normocytes. The latter point may represent a confirmation of Haldane's prophetic statement: 'The corpuscles of the anaemic heterozygotes are smaller than normal, and more resistant to hypotonic solutions. It is at least conceivable that they are also more resistant to attacks by the sporozoa which cause malaria.'" @default.
• W2086931489 created "2016-06-24" @default.
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• W2086931489 date "2003-10-01" @default.
• W2086931489 modified "2023-09-27" @default.
• W2086931489 title "The Haldane malaria hypothesis: facts, artifacts, and a prophecy" @default.
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• W2086931489 doi "https://doi.org/10.1179/135100003225002952" @default.
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