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Ultrasound-induced changes in synaptic processes with different transmitters in smooth muscles

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The effect of therapeutic-intensity ultrasound on neuromuscular transmission and spontaneous electrical and contractile activity in smooth muscles of the gastrointestinal tract of guinea pig was studied by a modified sucrose-gap technique. The action of ultrasound was found to facilitate the acetylcholinergic neuromuscular transmission (mainly by increasing the amplitude of excitatory postsynaptic potentials). The higher efficiency of the nonadrenergic neuromuscular transmission was manifested as an increase (nearly twofold) in the total duration, but not in the amplitude, of inhibitory postsynaptic potentials. Modulations of the first and second components of the potentials caused respectively by the action of ATP and of nitric oxide as possible transmitters, were different. Concurrently with enhancing the synaptic transmission efficiency, ultrasound exerted an opposite, inhibitory, effect on generation of spontaneous action potentials and contraction of smooth muscles. All the ultrasound effects were fully reversible. The findings permit assuming a special mechanism of modification of the synaptic transmission in smooth muscles under the action of ultrasound.

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Neirofiziologiya/Neurophysiology, Vol. 25, No. 4, pp. 297–302, July–August, 1993.

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Vladimirova, I.A., Zagorodnyuk, V.P., Ostrovsky, I.V. et al. Ultrasound-induced changes in synaptic processes with different transmitters in smooth muscles. Neurophysiology 25, 251–255 (1993).

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