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- W2433800538 abstract "Effects of isotonic solutions of polyethylene (glycol) 1500 (PEG-1500) and sucrose on Ca2+ influx into ATP-depleted red blood cells were studied using the Ca2+ -sensitive fluorescent dye fura-2AM. When incubated in isotonic low ionic strength media (containing 2 mM CaCl2 in addition to sucrose and PEG-1500), the initial rate of Ca2+ influx was higher than that for the cells in physiological (normal ionic strength) medium. After 20 minutes of incubation in the PEG-1500-containing solution, a 10-fold increase of Ca2+ influx was observed, whereas in the sucrose medium the rate of Ca2+ influx decreased compared to that in physiological medium. 1H-NMR data provided no evidence of direct interaction between PEG-1500 and the erythrocyte membrane. Moreover, PEG-1500 did not affect lipid peroxidation (LPO) induction in erythrocyte membranes. We propose that a change in the hydrogen environment of Ca2+ -ATPase of the erythrocytes suspended in the PEG-1500 solution is the primary cause of altered Ca2+ homeostasis in these cells. The activation of the Ca2+ -ATP-ase in sucrose medium may result in an incomplete suppression of the Ca2+-pump activity in ATP-depleted cells, which is accelerated when calmodulin binds with the Ca2+-ATP-ase under the conditions of rapid Ca2+ accumulation." @default.
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- W2433800538 date "2007-05-15" @default.
- W2433800538 modified "2023-09-26" @default.
- W2433800538 title "The study of Ca2+ influx in human erythrocytes in isotonic polyethylene (glycol) 1500 (PEG-1500) and sucrose media." @default.
- W2433800538 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17494318" @default.
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