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[Localization and identification of neuropeptide Y (NPY) in the brain of an anuran amphibian].

A neuropeptide Y (NPY)-like peptide has been localized in the frog brain by the direct immunofluorescence method. Subcellular localization of NPY has been studied by PAP immunocytochemistry and the immunogold technique. Using a specific radioimmunoassay technique, NPY-like peptide has been quantified in various brain areas and the immunoreactive material was characterized by Sephadex G-50 gel filtration and high performance liquid chromatography. The results indicate that frog NPY is closely related to the porcine molecule and largely distributed in the frog brain. This peptide may play both neurotransmitter and neuroendocrine functions in amphibia.