L-Arginine Immunoreactive Enteric Glial Cells in the Enteric Nervous System of Rat Ileum

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Abstract
L-arginine is a precursor of nitric oxide (NO) that may be involved in neuronal activity in the gastrointestinal tract. It is known that NO is formed from L-arginine by NO synthase which is localized in neurons in the enteric nervous system. The present study demonstrated that significant L-arginine immunoreactivity was present in the enteric ganglia. Ultrastructural examination showed that L-arginine immunoreactivity was present in the ganglionic glial cells but not in neurons. These findings suggest that enteric glial cells may represent the main reservoir of L-arginine, which may possibly be transferred to neurons when used.

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