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. 1991 May;103(1):1242–1250. doi: 10.1111/j.1476-5381.1991.tb12331.x

Endothelin modulates calcium channel current in neurones of rabbit pelvic parasympathetic ganglia.

T Nishimura 1, T Akasu 1, J Krier 1
PMCID: PMC1908065  PMID: 1652345

Abstract

1. The effects of endothelin were studied, in vitro, on neurones contained in the rabbit vesical pelvic ganglion by use of intracellular and single-electrode voltage clamp techniques under conditions where sodium and potassium channels were blocked. 2. In the current-clamp experiments, endothelin (1 microM) caused a depolarization followed by a hyperpolarization of the membrane potential. In the voltage-clamp experiments, endothelin (0.01-1 microM) caused an inward current followed by an outward current in a concentration-dependent manner. 3. Membrane conductance was increased during the endothelin-induced depolarization and inward current. Membrane conductance was decreased during the endothelin-induced hyperpolarization and outward current. 4. The endothelin-induced inward and outward currents were not altered by lowering external sodium concentration or raising external potassium concentration. 5. The endothelin-induced inward current was depressed (mean 72%) in a Krebs solution containing nominally zero calcium and high magnesium. These results suggest that a predominent component of the endothelin-induced inward current is mediated by calcium ions. 6. The calcium-insensitive component of the inward current was abolished by a chloride channel blocker, 4-acetamide-4'-isothiocyanostilbene-2,2'-disulphonic acid. The mean reversal potential for the calcium-insensitive component of the inward current was -18 mV. This value is near the equilibrium potential for chloride. Thus, it is presumed that the calcium-insensitive component of the inward current is carried by chloride ions. 7. Endothelin caused an initial depression followed by a long lasting facilitation of both rapidly and slowly decaying components of high-threshold calcium channel currents (N- and L-type).(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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