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Decentralization of the superior cervical ganglion (S.C.G.) of the rat elevated the neuropeptide-Y immunoreactivity (NPY-ir) content of the ganglion on day 1 (+43%) but not on day 3 post-surgery. The content of NPY-ir in the iris was increased by decentralization (+40%) 3 days post-surgery, and treatment with clonidine (+43%), and pempidine (+82%). The levels of NPY-ir in the rat vas deferens were not affected by either surgical or pharmacological treatment. These results suggest NPY is released from sympathetic nerves in the iris but not vas deferens during normal sympathetic activity. |
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