Presynaptic serotonergic modulation of spontaneous and miniature synaptic activity in frog lumbar motoneurons |
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Authors: | N. I. Kalinina G. G. Kurchavyi A. V. Zaitsev N. P. Veselkin |
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Affiliation: | 1.Sechenov Institute of Evolutionary Physiology and Biochemistry,Russian Academy of Sciences,St. Petersburg,Russia;2.St. Petersburg State University,St. Petersburg,Russia |
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Abstract: | The effects of serotonin (5-HT, 30 μM) on spontaneous and miniature synaptic activity in lumbar motoneurons from the isolated Rana ridibunda spinal cord were investigated using intracellular recording. 5-HT increased the frequency of spontaneous (sPSPs) and miniature postsynaptic potentials (mPSPs). The effect of 5-HT on different subpopulations of mPSPs was multidirectional: it increased the frequency of glutamatergic excitatory mPSPs by 18% and decreased the frequency of glycinergic inhibitory mPSPs by 28%, but had no effect on the frequency of GABAergic inhibitory mPSPs. The amplitude and kinetic parameters of any subpopulation of mPSPs did not change. The data obtained show that 5-HT regulates the probability of glutamate and glycine release from the presynaptic terminals ending at frog spinal motoneurons. 5-HT shifts the balance between synaptic excitation and inhibition in the spinal neural network toward excitation. Thus, 5-HT participates in control of motor output and provides its facilitation. |
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