Nitric oxide synthase immunoreactivity in rat pontine medullary neurons

Neuroscience
N J DunU Förstermann

Abstract

Nitric oxide synthase immunoreactivity was detected in neurons and fibers of the rat pontine medulla. In the medulla, nitric oxide synthase-positive neurons and processes were observed in the gracile nucleus, spinal trigeminal nucleus, nucleus of the solitary tract, dorsal motor nucleus of the vagus, nucleus ambiguus, medial longitudinal fasciculus, reticular nuclei and lateral to the pyramidal tract. In the pons, intensely labeled neurons were observed in the pedunculopontine tegmental nucleus, paralemniscal nucleus, ventral tegmental nucleus, laterodorsal tegmental nucleus, and lateral and medial parabrachial nuclei. Labeled neurons and fibers were seen in the interpeduncular nuclei, dorsal and median raphe nuclei, central gray and dorsal central gray, and superior and inferior colliculi. Double-labeling techniques showed that a small population (< 5%) of nitric oxide synthase-positive neurons in the medulla also contained immunoreactivity to the aminergic neuron marker tyrosine hydroxylase. The majority of nitric oxide synthase-immunoreactive neurons in the dorsal and median raphe nuclei were 5-hydroxytryptamine-positive, whereas very few 5-hydroxytryptamine-positive cells in the caudal raphe nuclei were nitric oxide synthas...Continue Reading

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