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Projections of nitric oxide synthesizing neurons in the guinea-pig colon

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Abstract

The neuronal form of the enzyme nitric oxide synthase, which is an obligatory constituent of neurons that utilise nitric oxide as a transmitter, was revealed histochemically in this study by its ability to transfer a proton from reduced nicotinamide adenine dinucleotide phosphate to nitro-blue tetrazolium. In the guinea-pig colon, nitric oxide synthase was located in numerous irregularly-shaped myenteric neurons with single axons. In the submucosa, a small number of neurons had strong enzyme activity, whereas many were weakly stained. Nerve fibres were found in the longitudinal muscle, circular muscle, muscularis mucosae and ganglia of the two plexuses. No nerve fibres were found in the lamina propria of the mucosa. The same distribution of nerve cells and fibres was revealed using immunohistochemistry for nitric oxide synthase. Lesion studies showed that the axons of myenteric neurons all projected anally. Myenteric cells were the source of nerve fibres in the circular muscle and in more anally located myenteric ganglia. The sparse innervation of submucous ganglia was intrinsic to the submucous plexus. It is suggested that nitric oxide synthase is one of the transmitters of inhibitory neurons to the muscle and is also utilized by descending interneurons of the myenteric plexus.

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McConalogue, K., Furness, J.B. Projections of nitric oxide synthesizing neurons in the guinea-pig colon. Cell Tissue Res 271, 545–553 (1993). https://doi.org/10.1007/BF02913739

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