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- W2015894377 abstract "Human erythrocytes vesiculate upon exposure to temperatures of 49°C and above. Pretreatment of the cells with the thiol-alkylating agent N-ethylmaleimide (NEM) lowers the temperature needed to produce the same effect. Concomitant with the cells' heat susceptibility, skeletal mechanical instability and an increase in spectrin dissociation have been reported (Smith and Palek (1983) Blood 62, 1190). In the present study, similar results were achieved by preincubation of the cells with diamide, which could be reversed by reduction with dithiothreitol. Another oxidative agent, sodium tetrathionate, could only induce the temperature susceptibility, with little effect on spectrin dissociation. Incubation of spectrin solutions with NEM or diamide caused decreased association of spectrin dimers and increased dissociation of spectrin tetramers. Estimation of membrane and spectrin thiols in the treated cells showed that NEM was effective while blocking less than 20% of the thiols. Diamide and tetrathionate blocked more than 50% of the thiols, but were less effective than NEM. It is suggested that some very defined population of thiols is essential for spectrin self-association and for membrane thermal stability. They are more available to NEM than to diamide and less so to tetrathionate. Other thiols participate in maintaining the membrane thermal stability only." @default.
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- W2015894377 date "1988-07-01" @default.
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- W2015894377 title "Direct involvement of spectrin thiols in maintaining erythrocyte membrane thermal stability and spectrin dimer self-association" @default.
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- W2015894377 doi "https://doi.org/10.1016/0005-2736(88)90035-1" @default.
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