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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Enkephalins presynaptically inhibit cholinergic transmission in sympathetic ganglia.

Recent biochemical and immunohistochemical studies have shown that the opioid peptides, enkephalins, occur in nerve terminals and cell bodies in mammalian sympathetic ganglia1-3. Opiates and enkephalins are thought to inhibit synaptic transmission in the peripheral nervous tissues as well as in the central nervous system4-12. The mechanisms of the opiate actions, however, are not entirely clear; both pre- and postsynaptic sites of action have been proposed7-9,11,12. As acetylcholine is known to be the major neurotransmitter in the autonomic ganglia and as the mechanism of synaptic transmission is well clarified13, analysis of the peptide action could be more easily but equally usefully carried out in the peripheral synapses than in central synapses. We now report that enkephalins presynaptically inhibit cholinergic transmission in sympathetic ganglia.[1]


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