Abstract
The cortical reaction in isolated sea urchin ( Strongylocentrotus purpuratus ) egg cortices has been monitored with phase-contrast video microscopy. It was confirmed that the cortical reaction is induced by exposure to Ca 2+. No induction was observed after exposure to the Ca 2+-ionophore A23187, although the cortices remain sensitive to a subsequent exposure to Ca 2+, and the cortical reaction in unfertilized eggs suspended in cortex isolation medium remains inducible by exposure to A23187. These results imply: (1) that A23187 does not induce the cortical reaction directly; (2) that the release of intracellular Ca 2+, through which A23187 induces the cortical reaction, is not from storage sites localized entirely in the cortex; and (3) that intracellular storage sites for the Ca 2+ involved in the cortical reaction are also present outside the cortex.
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