Abstract
A number of mechanical and chemical methods have been developed to achieve selective permeabilization of the plasma membrane. These methods have been applied to many cell types and have proven to be highly useful for studying stimulus-secretion coupling mechanisms. Thus far, this approach has contributed significantly to our understanding of phosphoinositide metabolism and the regulation of intracellular calcium. The permeabilization techniques also have contributed important information regarding cAMP-dependent pathways. In addition to studies of stimulus-secretion coupling, permeabilized cell preparations can be employed for investigations of enzyme activity in situ and the properties of intracellular organelles in general. Since cell permeabilization, particularly with chemical agents, is surprisingly easy, these techniques should find wide application for future studies.
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