Coagulation of sea urchin egg cytoplasm by high salt concentrations |
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Authors: | Tsuneo Takahashi Mary StJ Douglas Robert J Williams |
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Institution: | Cryobiology Laboratory, American Red Cross Blood Services Laboratories, 9312 Old Georgetown Road, Bethesda, Maryland 20814 U.S.A. |
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Abstract: | Unfertilized sea urchin eggs exposed to hyperosmotic salt solutions in excess of 1.75 M undergo a form of intracellular coagulation known as black cytolysis, similar to that seen in eggs injured by freezing. The process can be simulated by the microinjection of hypertonic salt into the cell suspended in isotonic solution in the absence of volume reduction. Black cytolysis during hyperosmotic stress can be attributed to the entry of concentrated extracellular solution through a membrane made permeable by excessive osmotic stress. |
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