Nitric oxide modulates local reflexes of the tailfan of the crayfish

Araki, M., Schuppe, H., Fujimoto, S., Nagayama, T. and Newland, P.L. (2004) Nitric oxide modulates local reflexes of the tailfan of the crayfish. Journal of Neurobiology, 60, (2), 176-186. (doi:10.1002/neu.20007).


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Electrical stimulation of sensory neurons that innervate receptors on the tailfan of crayfish evokes a reflex response of motor neurons that produce movements of the blades of the tailfan, the uropods. We analyzed the modulatory effects of nitric oxide (NO) on the spike frequency of the reflex response. Bath application of L-arginine and SNAP, which elevate endogenous and exogenous NO levels, increased the frequency of the evoked response, whereas the application of L-NAME and PTIO, which reduce NO levels, decreased the frequency of the response. To determine through what pathway and target NO exerted these effects we bath applied ODQ, an inhibitor of soluble guanylyl cyclase (sGC), which decreased the frequency of response, and 8-br-cGMP, which increased the spike frequency of response. To provide further evidence that NO acts via sGC, we elevated NO levels with L-arginine while simultaneously inhibiting sGC with ODQ. This application reduced the response to control levels, indicating that NO in the terminal ganglion of crayfish acts via sGC to modulate cGMP levels, which in turn regulate the responses of the uropod motor neurons.

Item Type: Article
Digital Object Identifier (DOI): doi:10.1002/neu.20007
Related URLs:
Keywords: cyclic GMP, modulation, motor neuron, reflex, local circuits
Subjects: Q Science > Q Science (General)
R Medicine > R Medicine (General)
Divisions : University Structure - Pre August 2011 > School of Biological Sciences
ePrint ID: 55875
Accepted Date and Publication Date:
16 April 2004Published
Date Deposited: 06 Aug 2008
Last Modified: 31 Mar 2016 12:36

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