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de Vente, J. et al.

de Vente, Markerink-van Ittersum, Axer, Steinbusch,

Nitric-oxide-induced cGMP synthesis in cholinergic neurons in the rat brain.

Nitric oxide (NO)-mediated cGMP synthesis is localized throughout the rat brain in close proximity to the NO-synthase-containing structures. However, characterization of the cGMP synthesizing structures in terms of co-localization with the classical neurotransmitter systems has not yet been reported. Here we present evidence, using double immunostaining for cGMP and the vesicular acetylcholine transporter, that virtually all of the cholinergic fibers in the cerebral cortex and the majority of the cholinergic fibers in the basal ganglia accumulate cGMP in response to a NO donor. In these areas, only few cGMP-containing fibers were observed not to be part of the cholinergic system. Co-localization between cGMP and the vesicular acetylcholine transporter was only observed to a minor degree in the ventral forebrain, the hippocampus, the reticular thalamic nucleus, and the nucleus ambiguus. No association of cGMP synthesis with the cholinergic system was observed to a similar extent in other brain areas. These results, in combination with literature data on the distribution of cholinergic receptors in the rat brain, suggest that NO has an anterograde and/or retrograde signaling function on subsets of cholinergic neurons.[1]

References

Nitric-oxide-induced cGMP synthesis in cholinergic neurons in the rat brain. de Vente, J., Markerink-van Ittersum, M., Axer, H., Steinbusch, H.W. Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale. (2001) [Pubmed]

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