Summary
Studies of binding to isolated uterine muscle membranes show that dihydropyridine Ca-channel antagonists bind specifically to plasma membranes. Furthermore, other studies show that binding of these antagonists correlates with their functional effects in the same tissue. However, the agents have no effect detected to date on Ca fluxes into or out of isolated vesicles from the same tissue. Thus, it is possible that Ca2+ channels are inactivated during or after membrane isolation and that correlations between binding and functional antagonism by these antagonists may be irrelevant. However, other studies using an irreversible ligand of the dihydropyridine type for Ca channels applied to isolated cells found a similar locus of binding to plasma membranes, but binding characteristics were not studied. Thus, the relationship between binding of these antagonists to plasmalemmal sites and their functional effects needs further study.
Supported by the Medical Research Council of Canada, the Ontario Heart Foundation, and Miles Laboratories Inc., New Haven, Conn.
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© 1986 Springer-Verlag Tokyo
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Kwan, C.Y., Grover, A.K., Daniel, E.E. (1986). Use of Isolated Membranes of Smooth Muscle to Study Calcium Channels. In: Aoki, K. (eds) Essential Hypertension. Springer, Tokyo. https://doi.org/10.1007/978-4-431-68048-2_12
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DOI: https://doi.org/10.1007/978-4-431-68048-2_12
Publisher Name: Springer, Tokyo
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