Summary
Antiserum raised against a mammalian neurophysin, porcine neurophysin-II, was used in conjugation with the immunoperoxidase histochemical technique to detect neurophysin in the hypothalamus of the chicken, frog and goldfish. In the chicken, the paraventricular and supraoptic nuclei as well as the internal and external zones of the median eminence stained for neurophysin. Material in the perikarya of the frog and goldfish preoptic nucleus also cross-reacted immunologically against anti-porcine neurophysin-II serum.
Serial dilutions of the anti-mammalian neurophysin serum were carried out in order to ascertain at which point the 3-layer immunocytochemical reaction ceased to localize neurophysin. In the chicken, frog and goldfish as well as in the rat, neurosecretory structures became difficult to visualize between 12800 and 25400 fold dilution of antiserum.
The results demonstrate that the immunological cross-reactivity previously observed between an anti-mammalian neurophysin serum and the neurophysin isolated from mammals of varying phylogeny also extends to certain non-mammalian vertebrates and is suggestive of a structural homology of neurophysin from different species.
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This work was financed by The Medical Research Council of New Zealand.
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Watkins, W.B. Immunocytochemical identification of neurophysin-secreting neurons in the hypothalamo-neurohypophysial system of some non-mammalian vertebrates. Cell Tissue Res. 162, 511–521 (1975). https://doi.org/10.1007/BF00209350
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DOI: https://doi.org/10.1007/BF00209350