Summary
Polymerization-depolymerization of proteins within cells and subcellular organelles may have powerful osmotic effects. As a model to study these we analyzed the predicted volume changes following hemoglobin (Hb) S polymerization in sickle cell anemia (SS) red cells with different initial volumes. The theoretical analysis predicted that dehydrated SS red cells may sustain large polymerization-induced volume shifts whose direction would depend on whether or not small solutes were excluded from polymer-associated water. Experiments with SS cells from promptly fractionated venous blood showed oxygenation-induced swelling, maximal in the densest cells, in support of nonexclusion models. The predicted extent of cell dehydration on polymerization was strongly influenced by factors such as the dilution of residual soluble Hb and the increased osmotic contribution of Hb in cells dehydrated by salt loss, largely overlooked in the past. The osmotic effects of polymer formation may thus play an important part in microcirculatory infarction by dense SS cells, as they become even denser and stiffer during deoxygenation in the capillaries.
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Lew, V.L., Bookchin, R.M. Osmotic effects of protein polymerization: Analysis of volume changes in sickle cell anemia red cells following deoxy-hemoglobin S polymerization. J. Membrain Biol. 122, 55–67 (1991). https://doi.org/10.1007/BF01872739
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DOI: https://doi.org/10.1007/BF01872739