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- W2040221734 abstract "A dual action of selective metabotropic glutamate receptor agonists on neuronal excitability and dorsal root-evoked excitatory (DR-EPSPs) and inhibitory (DR-IPSPs) neurotransmission is described for immature rat ventral horn neurons in vitro. Trans-1-Aminocyclopentane-1,3-dicarboxylate (trans-ACPD), its stereoisomer (1S,3R)-1-aminocyclopentane-1,3-dicarboxylate ((1S,3R)-ACPD) and (2S,3S,4S)-α-(carboxycyclopropyl)-glycine (MCPG)-sensitive depolarisation. An (1S,3R)-ACPD- or L-CCG-1-induced increase in intrinsic neuronal excitability was apparently independent of the depolarisation and was observed as (a) a fall in the threshold current required to elicit regenerative excitation and (b) an increased number of spikes to a fixed amplitude step depolarisation. The spike after-hyperpolarisation (AHP) duration and amplitude were reduced, suggesting an mGluR agonist action on potassium channels. Synaptic responses were depressed by the mGluR agonists. (1S,3R)-ACPD or L-CCG-1 reduced the mean ± S.E.M. peak amplitude of a subthreshold EPSP elicited by low-intensity stimuli likely to recruit only low-threshold sensory afferents. The peak amplitude of longer-latency EPSPs elicited by higher-intensity stimuli likely to recruit high-threshold afferents in addition was attenuated. (1S,3R)-ACPD- or L-CCG-1 reduced the peak amplitude of an IPSP evoked by dorsal root stimulation. These effects on synaptic transmission were likely to be due to the combined activation of postsynaptic and presynaptic metabotropic glutamate receptors. The implications of these data for the physiological role of spinal mGluRs is discussed. © 1997 Elsevier Science Ltd. All rights reserved." @default.
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- W2040221734 title "Dual Action of Metabotropic Glutamate Receptor Agonists on Neuronal Excitability and Synaptic Transmission in Spinal Ventral Horn Neurons In Vitro" @default.
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