Abstract
It is generally assumed that mild pressure of a few atmospheres, such as that applied to blood cells during routine centrifugation, does not affect cell function. The results of the present study refute this notion. To explore the effect of mild pressure on cell function we examined its effect on the susceptibility of red blood cells (RBC) to hemolysis by snake venom phospholipase A2 (PLA2). Rat RBC were subjected to pressure of up to five atmospheres, returned to ambient pressure and interacted with PLA2 to induce hemolysis. The hemolysis was markedly decreased with increasing the pressure applied before induction of hemolysis. Application of such a pressure induces the shedding of a chemical factor, as yet uncharacterized, which facilitates the action of PLA2 on RBC.
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