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- W2083145212 abstract "The sensory neurons (photoreceptors) in the visual system of Hermissenda are one site of plasticity produced by Pavlovian conditioning. A second site of plasticity produced by conditioning is the type I interneurons in the cerebropleural ganglia. Both photoreceptors and statocyst hair cells of the graviceptive system form monosynaptic connections with identified type I interneurons. Two proposed neurotransmitters in the graviceptive system, serotonin (5-HT) and γ-aminobutyric acid (GABA), have been shown to modify synaptic strength and intrinsic neuronal excitability in identified photoreceptors. However, the potential role of 5-HT and GABA in plasticity of type I interneurons has not been investigated. Here we show that 5-HT increased the peak amplitude of light-evoked complex excitatory postsynaptic potentials (EPSPs), enhanced intrinsic excitability, and increased spike activity of identified type I e(A) interneurons. In contrast, 5-HT decreased spike activity and intrinsic excitability of type I e(B) interneurons. The classification of two categories of type I e interneurons was also supported by the observation that 5-HT produced opposite effects on whole cell steady-state outward currents in type I e interneurons. Serotonin produced a reduction in the amplitude of light-evoked complex inhibitory PSPs (IPSPs), increased spontaneous spike activity, decreased intrinsic excitability, and depolarized the resting membrane potential of identified type I i interneurons. In contrast to the effects of 5-HT, GABA produced inhibition in both types of I e interneurons and type I i interneurons. These results show that 5-HT and GABA can modulate the intrinsic excitability of type I interneurons independent of the presynaptic effects of the same transmitters on excitability and synaptic efficacy of photoreceptors." @default.
- W2083145212 created "2016-06-24" @default.
- W2083145212 creator A5010025349 @default.
- W2083145212 creator A5064148375 @default.
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- W2083145212 date "2009-11-01" @default.
- W2083145212 modified "2023-09-25" @default.
- W2083145212 title "5-HT and GABA Modulate Intrinsic Excitability of Type I Interneurons in Hermissenda" @default.
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- W2083145212 doi "https://doi.org/10.1152/jn.00477.2009" @default.
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