Abstract
A neuropeptide, substance P (1–50 μM) caused a prompt but transient rise in tissue cyclic AMP levels and also increased the release of thyroid hormones from canine thyroid slices. While norepinephrine markedly inhibited the stimulation by TSH of such paramaters as reported previously, substance P had no effect. These results suggest that substance P may play a regulatory role in thyroid gland functions in a manner different from norepinephrine.
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