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Human erythrocytes (RBC) were incubated for various time at 37 °С in hypertonic solutions of NaCl (1.5 M) or sucrose (1.2 M) and then rehydrated in isotonic NaCl or sucrose media in the presence or absence of divalent cations Ca* and Zn*. After equilibration in hypertonic sucrose both cations significantly increased the extent of hemolysis at concentration dependent manner, but show more complex response after equilibration in hypertonic NaCl media In this case both Ca and Zn* ions love their activation ability during rehydration in isotonic NaCl media, and Ca"* did so in isotonic sucrose. Dehydration of cells in hypertonic sucrose solutions in the presence of 100 mM of cations Na, fC and Mg leads to decrease the extent of lysis after rehydration but does not influence activation ability of Ca* and Zn, whereas addition of Ca to hypertonic sucrose solution completely abolishes activation effect of both ions. The model of posthypertonic lysis is presented according to which action of cations Ctf + and Zn may be explained by their specific binding to activatory and inhibitory membrane sites, regulating membrane permeability during reswelling from hypertonic salines.

Influence of divalent cations Ca2+ and Zn2+ on the activation of posthypertonic hemolysis of human erythrocytes