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Effects of Norepinephrine and Epinephrine on Resting Membrane Potential in Body Wall Muscle Cells of Lumbricus Terrestris Eearthworm

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Abstract

Norepinephrine and to a lesser extent epinephrine increased the resting membrane potential of earthworm body wall muscle cells. Ouabain, phentolamine, propranolol, and replacement of Ca2+ with Mg2+ in the incubation medium abolished this effect. External 3'5'-cAMP in high concentration, dibutyryl cAMP, and dibutyryl cGMP did not induced hyperpolarization of muscle cell membranes. It was concluded that norepinephrine and epinephrine increased the resting membrane potential in earthworm body wall muscle cells via activation of Na+, K+ pump. This process involves Ca2+ and sarcolemmal adrenergic structures, similar to α-adrenoceptors in vertebrate, but not the cyclic nucleotide systems.

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Authors and Affiliations

  1. Kazan' State Medical University, Russia

    E. M. Volkov, L. F. Nurullin, E. E. Nikol'skii & G. I. Blokhina

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  1. E. M. Volkov
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  2. L. F. Nurullin
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  3. E. E. Nikol'skii
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  4. G. I. Blokhina
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Volkov, E.M., Nurullin, L.F., Nikol'skii, E.E. et al. Effects of Norepinephrine and Epinephrine on Resting Membrane Potential in Body Wall Muscle Cells of Lumbricus Terrestris Eearthworm. Bulletin of Experimental Biology and Medicine 132, 821–823 (2001). https://doi.org/10.1023/A:1013114830161

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  • DOI: https://doi.org/10.1023/A:1013114830161

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