Membrane motions of LH receptors following binding of hormone agonists are consistent with hormone-driven aggregation. It is increasingly apparent that G protein-coupled receptors, including the LH receptor, are engaged in dynamic interactions with one another and other membrane components. These interactions are governed, in part, by a number of factors including whether the receptor has bound ligand, whether the receptor is capable of transducing a hormone-mediated signal, and the nature of the membrane environment within which the receptor is found. Microscopic methods, including laser-optical techniques, are ideally suited to probe dynamic events on cell membranes and provide an opportunity to examine interactions between receptors and other membrane components on viable cells. We and others have used a variety of techniques, some of which are summarized below, to examine functional and nonfunctional LH receptors on viable cells and the membrane environment of these receptors during cell signaling events.
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