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The presence of thyrotropin-releasing hormone (TRH) and neuropeptide Y (NPY) has been demonstrated in the neural lobe and in the intermediate lobe of the frog pituitary by immunocytochemistry on ultrathin sections of neurointermediate lobes obtained by cryoultramicrotomy. In the neural lobe, separate populations of TRH- or NPY-immunoreactive nerve fibers were observed. Both neuropeptides were contained in dense-core secretory vesicles about 200 nm in diameter. In intermediate lobe cells, TRH- and NPY-like immunoreactivities were observed in the cytoplasmic matrix and more sparsely in secretory granules. Occasionally, immunoreactive TRH could be visualized at the plasma membrane level. In the nucleus, both peptides were detected in the euchromatin, in the vicinity of the heterochromatin and in the nucleolus. Conversely, gonadotropin-releasing hormone-like immunoreactivity could not be detected. These results provide immunocytological evidence for the presence of endogenous TRH and NPY in frog melanotrophs indicating that these peptides may participate in the regulation of intermediate lobe secretion.
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