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Endothelium‐dependent hyperpolarization and intercellular electrical coupling in guinea‐pig mesenteric arterioles
Author(s) -
Yamamoto Yoshimichi,
Imaeda Kenro,
Suzuki Hikaru
Publication year - 1999
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1111/j.1469-7793.1999.505ae.x
Subject(s) - gap junction , hyperpolarization (physics) , biophysics , acetylcholine , depolarization , charybdotoxin , membrane potential , current clamp , patch clamp , chemistry , intracellular , cell junction , electrophysiology , voltage clamp , biology , microbiology and biotechnology , endocrinology , biochemistry , cell , neuroscience , nuclear magnetic resonance spectroscopy , organic chemistry
1 Using the conventional whole‐cell clamp method, the electrical responses of individual smooth muscle and endothelial cells to acetylcholine (ACh) were observed in multicellular preparations where the two types of cells remained in close apposition. 2 In both types of cells, ACh induced similar hyperpolarizing responses which, when recorded in current clamp mode, had two phases (an initial fast and a second slower phase). 3 After blocking gap junctions, including myoendothelial junctions, with 18β‐glycyrrhetinic acid, ACh induced an outward current with two phases in voltage‐clamped endothelial cells. The outward current appeared around −90 mV and increased linearly with the membrane depolarization. 4 In smooth muscle cells, ACh failed to induce a membrane current after gap junctions had been blocked with 18β‐glycyrrhetinic acid. The inhibition of ACh‐induced response by 18β‐glycyrrhetinic acid was observed using either sharp or patch electrodes. 5 Nominally Ca 2+ ‐free solution reduced the initial phase and abolished the second phase of ACh‐induced responses of endothelial cells. Both phases were also reduced by charybdotoxin (CTX). 6 Our results indicate that in guinea‐pig mesenteric arterioles, ACh hyperpolarizes endothelial cells by activating Ca 2+ ‐activated K + channels which are sensitive to CTX. On the other hand, hyperpolarizing responses detected in smooth muscle cells seem to originate in endothelial cells and conduct to the muscle layer via myoendothelial gap junctions.