The effects of inhalational anesthetics and NO upon activities of spinal dorsal horn neuron

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[background] Nitric oxide(NO) have a lot of actions in various tissues and organs. It is controversial about the action of NO with Inhalational anesthetics. We will investigate The effects of inhalational anesthetics and NO upon activities of spinal dorsal horn neuron.[method] Male Spargue-Dawley rats were anesthetized with halothane. Following tracheotomy, the animals were mechanically ventilated. Catheters were inserted into veins and arteries and the animal was decerebrated by aspiration and the spinal cord was transected at L1 and L2 and laminectomy was made. Animals were fixed on a stereotaxic frame. Following surgery, ventilation was maintained by pure oxygen. Extra-cellular single-cell action potentials were recorded and spike firing rate were measured. The low-threshold-mechanoreceptive neuron, nociceptor-specific neuron, wide-dynamic-range neuron was identified by the modality and by the depth from the cord dorsum. Four groups were studied : 1. Under pure oxygen, NO synthesis accelerator : L-arginine administrated group 2. Under pure oxygen, NO synthesis Inhibitor : L-NAME administrated group 3. Under 1MAC Halothane(1.1%), NO synthesis accelerator: L-arginine administrated group 4. Under 1MAC Halothane(1.1%), NO synthesis Inhibitor : L-NAME administrated group.[Results] L- NAME had no effect on the single-unit activity of dorsal horn neurons, and L-arginine had noeffects on the single-unit activity of dorsal horn neurons.[Conclusion] Our results suggest that NO had no action between the anesthetic mechanisms of Inhalational anesthetics.