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Suppressive effect of an activator of ATP-dependent potassium channels, flocalin, on electrical and contractile activities of smooth muscles of the guinea-pig ureter

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Abstract

In experiments on isolated segments or strips obtained from the guinea-pig ureter, we showed, using a sucrose-gap technique, that application of an activator of ATP-dependent potassium channels (KATP), (flocalin (PF-5), suppresses generation of action potentials (APs) by ureter smooth muscle cells (SMCs). Pre-incubation of the ureter preparations under study in Krebs solution containing 1 to 10 μM PF-5 results initially in a decrease in the frequency of oscillations preceding an AP plateau, shortening of this plateau, and, later on, complete inhibition of AP generation. In the presence of PF-5, spikes induced by hyperpotassium depolarization were also inhibited, while a tonic component of such depolarization underwent a mild decrease. The data obtained indicate that PF-5 modulates the entry of Ca2+ ions through L-type voltage-dependent channels in the SMC membrane. Shortening of the plateau and suppression of the spikes initiated by application of an activator of voltage-dependent L-type potassium channels, Bay K 8644, can be considered a confirmation of the modulatory influence of PF-5 on voltage-dependent L-type potassium channels. It seems possible that Bay K 8644 can be used under experimental conditions for initiation and long-lasting modulation of APs generated by the ureter SMC instead of corresponding neurotransmitters. We hypothesize that voltage-dependent entry of Ca2+ ions into SMCs depends significantly on the PF-5-induced activation of KATP channels of the ureter SMCs.

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Authors and Affiliations

  1. Bogomolets Institute of Physiology, National Academy of Sciences of Ukraine, Kyiv, Ukraine

    R. I. Yanchii, B. V. Dzhuran, I. B. Filippov & I. A. Vladimirova

Authors
  1. R. I. Yanchii
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  2. B. V. Dzhuran
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  3. I. B. Filippov
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  4. I. A. Vladimirova
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Corresponding authors

Correspondence to R. I. Yanchii, I. B. Filippov or I. A. Vladimirova.

Additional information

Neirofiziologiya/Neurophysiology, Vol. 37, Nos. 5/6, pp. 403–409, September–December, 2005.

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Yanchii, R.I., Dzhuran, B.V., Filippov, I.B. et al. Suppressive effect of an activator of ATP-dependent potassium channels, flocalin, on electrical and contractile activities of smooth muscles of the guinea-pig ureter. Neurophysiology 37, 353–358 (2005). https://doi.org/10.1007/s11062-006-0010-5

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  • DOI: https://doi.org/10.1007/s11062-006-0010-5

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