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Effects of anti-peptide antibodies against the second extracellular loop of human M2 muscarinic acetylcholine receptors on transmembrane potentials and currents in guinea pig ventricular myocytes

  • Part I: Cardiac Development and Regulation
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Abstract

The effects of anti-peptide antibodies against the second extracellular loop of human M2 muscarinic receptor on transmembrane potentials and currents in guinea pig single ventricular cells were analyzed using whole-cell patch clamp technique. These effects were compared with those of the muscarinic receptor agonists carbachol and acetylcholine. The antibodies shortened the action potential duration in a dose-dependent manner. By using a ramp or step rectangular pulse protocol, it was found that the antibodies increased the outward K+ current and decreased the inward basal I Ca significantly. The reversal potential of both carbachol-and antibody-induced extra currents were close to −80 mV, being in proximity to the calculated Ek of −90 mV. A β-adrenergic receptor agonist, isoprenaline, prolonged the action potential and increased the overshoot which could be inhibited by both antibody and carbachol. Isoprenaline increased inward Ica and outward Ik simultaneously. Both antibody and carbachol could significantly reduce the isoprenaline-stimulated ICa but not the isoprenaline-stimulated Ik. The antibody- or carbachol-induced outward K+ current and the depressant effects of antibody and carbachol on isoprenaline-stimulated Ica were partially antagonized by atropine. These results suggest that the anti-M2 muscarinic receptor antibodies display a stimulatory activity similar to muscarinic receptor agonist on the receptor-mediated electrophysiological events.

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Authors and Affiliations

  1. Department of Physiology, Shanxi Medical College, 030001, Taiyuan, China

    Rongrui Zhao, Wenze Wang & Bowei Wu

  2. Laboratoire d'Enzymologie et de Chimie des Proteines, URA 1334 CNRS, F 37032, Tours, France

    Johan Hoebeke

  3. Wallenberg Laboratory, Sahlgren's Hospital, University of Goteborg, 413 45, Goteborg, Sweden

    Åke Hjalmarson & Michael L. X. Fu

Authors
  1. Rongrui Zhao
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  2. Wenze Wang
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  3. Bowei Wu
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  4. Johan Hoebeke
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  5. Åke Hjalmarson
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  6. Michael L. X. Fu
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Zhao, R., Wang, W., Wu, B. et al. Effects of anti-peptide antibodies against the second extracellular loop of human M2 muscarinic acetylcholine receptors on transmembrane potentials and currents in guinea pig ventricular myocytes. Mol Cell Biochem 163, 185–193 (1996). https://doi.org/10.1007/BF00408657

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  • DOI: https://doi.org/10.1007/BF00408657

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