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Neuroreport. 1993 Jun;4(6):643-6.

Nitric oxide activates buccal motor patterns in Lymnaea stagnalis.

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Department of Physiology, University of Leeds, UK.


The mollusc, Lymnaea stagnalis, has been used as a model to study the mechanisms of nitric oxide (NO)-dependent processes in the CNS. Putative NO-containing neurones in Lymnaea are localized in the buccal ganglia, predominantly in areas where sensory neurones known to regulate feeding are found. The NO-generating substance, S-nitrosocysteine (S-NC, 5 x 10(-5)-10(-3 M) activates feeding movements of the buccal mass and modulates the activity of buccal motoneurones. An inhibitor of NO synthase, NG-methyl-L-arginine (10(-4) M) decreases the frequency of background buccal movements and has opposite effects to S-NC on the buccal motoneurones. We suggest that NO is a messenger in the CNS of Lymnaea and may be involved in coordination of feeding motor patterns.

[Indexed for MEDLINE]

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