Abstract
An optical measurement of membrane potential using a molecular probe might be beneficial in a variety of circumstances. “Such a probe could, we believe, provide a powerful new technique for measuring membrane potential in systems where, for reasons of scale, topology, or complexity, the use of electrodes is inconvenient or impossible” (B. M. Salzberg, personal sentence). The possibility of using optical methods was first suggested in 1968 by the discovery of potential-dependent changes in intrinsic optical properties of squid giant axons (Cohen et al., 1968). Shortly thereafter, (1968) found stimulus-dependent changes in fluorescence of stained axons, and in 1971 a search was begun (Cohen et al., 1971) for dyes that would give signals large enough to be useful for monitoring membrane potential. By now more than 1000 dyes have been tested for their ability to act as molecular transducers of changes in membrane potential into changes in three types of optical signals: absorption, birefringence, and fluorescence. This screening effort has resulted in the discovery of dyes with a signal-to-noise ratio 100 times larger than was available from any signal in 1971. Several of these dyes (see, e.g., Fig. 1) have been used to monitor changes in potential in a variety of preparations. For reviews, see (1978), (1979), (1983), (1988), and (1988). An earlier discussion of methods was published (Cohen and Lesher, 1986).
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Höpp, HP. et al. (1990). Multisite Optical Measurement of Membrane Potential. In: Boulton, A.A., Baker, G.B., Vanderwolf, C.H. (eds) Neurophysiological Techniques. Neuromethods, vol 14. Humana Press, Totowa, NJ. https://doi.org/10.1385/0-89603-160-8:193
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DOI: https://doi.org/10.1385/0-89603-160-8:193
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