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Using immunocytochemical methods at the electron microscope level, immunoreactivity for both melanin-concentrating hormone (MCH) and alpha-melanocyte-stimulating hormone (alpha-MSH) has been demonstrated in the carp neurohypophysis. A double-labelling technique, using colloidal gold probes of different sizes showed that immunoreactivity to both molecules coexists within the same neurosecretory granules in some neurones, while in other neurones the granules exhibit only MCH-like immunoreactivity. These observations suggest that the two immunoreactivities are attributable to separate molecules; if they are derived from the same precursor molecule, then this must be cleaved differently in the two sets of neurones. The absence of adrenocorticotropic hormone (ACTH)-like immunostaining in any neurosecretory granule might suggest the alpha-MSH-like molecule is not derived from the conventional pro-opiomelanocortin precursor.

Original publication




Journal article


Neurosci Lett

Publication Date





268 - 274


Animals, Carps, Cytoplasmic Granules, Eels, Hypothalamic Hormones, Immunohistochemistry, Melanins, Melanocyte-Stimulating Hormones, Microscopy, Electron, Neurons, Pituitary Gland, Pituitary Hormones, Trout