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Neuromedin U-like immunoreactivity in the thyroid gland of the rat

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Summary

Neuromedin U is a novel neuropeptide found to have a widespread distribution extending throughout the mammalian central nervous system, gastrointestinal tract and the endocrine cells of the pituitary gland. In order to investigate the possibility that neuromedin U-like immunoreactivity is also present in the thyroid gland of the adult rat we have examined its localisation and molecular nature by radioimmunoassay, immunocytochemistry and chromatographic analysis. The neuromedin U content of the whole thyroid gland was found to be 331±67 fmol/gland (mean±SEM), and this value significantly decreased (163±17 fmol/gland) as a result of 14 days of treatment with the anti-thyroid agent methimazole (10 mg/rat/day. Thyrotoxicosis induced by exogenous T4 (10 μg/rat/day) failed to alter the thyroid content of this peptide. Immunostaining studies localised neuromedin U to a minor population of parafollicular C-cells in untreated animals. Complementary chromatographic studies revealed a single molecular form of neuromedin U-like immunoreactivity in thyroid tissue extracts which was indistinguishable from synthetic rat neuromedin U standard.

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Domin, J., Al-Madani, A.M., Desperbasques, M. et al. Neuromedin U-like immunoreactivity in the thyroid gland of the rat. Cell Tissue Res 260, 131–135 (1990). https://doi.org/10.1007/BF00297498

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