Abstract
This chapter describes the basic properties of integral membrane channels from both cardiac sarcoplasmic reticulum and sarcolemma. Channels are studied, under voltage-clamp conditions, following their incorporation into planar phospholipid bilayers by fusion of isolated native membrane vesicles with preformed membranes. The rate of fusion of vesicles may be influenced by a number of factors including divalent cations and negatively charged phospholipids in the preformed bilayer.
Mammalian cardiac sarcoplasmic reticulum contains a monovalent cation selective channel with a single-channel conductance of approximately 150 pico-Siemens in the presence of symmetrical solutions of 500 mM K+ at holding potentials ranging from -60 to +60 mV. The probability of the channel being in the open state is high at positive holding potentials and low at negative holding potentials.
Mammalian cardiac sarcolemma contains at least three K+-selective channels and one Cl--selective channel.
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© 1985 Springer Science+Business Media New York
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Williams, A.J. (1985). The Measurement of Cardiac Membrane Channels following Their Incorporation into Phospholipid Bilayers. In: Harris, P., Poole-Wilson, P.A. (eds) Advances in Myocardiology. Advances in Myocardiology. Springer, Boston, MA. https://doi.org/10.1007/978-1-4757-1287-2_5
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DOI: https://doi.org/10.1007/978-1-4757-1287-2_5
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