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Effects of colchicine on release of neurosecretory material from the posterior pituitary gland of the rat

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Summary

The effect of colchicine on the release of neurosecretory material from the posterior pituitary gland was investigated in the rat in vivo and in vitro. Colchicine was administered subarachnoidally when neurophysin, radiolabelled by injection of (35S) cysteine into the supraoptic nucleus, had accumulated in the neural lobe. Dehydration for 3 days of non-colchicine-treated rats was followed by a 100% reduction of neurophysin-bound radioactivity. When colchicine was given prior to dehydration, the reduction of radioactive neurophysin was less marked. Colchicine treatment alone was likewise followed by a lowering of protein-bound radioactivity in the neural lobe, which may indicate that colchicine, in addition to blocking the rapid axonal transport of neurosecretory material, also impedes the slow transport.

The release of radioactive neurophysin in response to depolarizing concentration of potassium in vitro was diminished in the presence of colchicine, the reduction being most pronounced after colchicine treatment in vivo. The biochemical data prove the view that colchicine inhibits the release of neurosecretory material from the neural lobe. The ultrastructural findings support the biochemical data. Thus, colchicine treatment alone or followed by dehydration induced a marked increase in the number of organelles, especially of mitochondria and dense bodies. There was a marked increase in the number of enlarged axons filled with dammed organelles in the infundibulum and neurohypophysis. There was an accumulation of dense core vesicles and microvesicles in the axonal terminals in the neurohypophysis after treatment with either colchicine or colchicine followed by dehydration, which indicates an impediment of the release process. Dehydration alone induced a depletion of the dense core vesicles in the terminals. Out from the combined biochemical and ultrastructural findings possible mechanisms for the action of colchicine are discussed.

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  1. Institute of Neurobiology, University of Göteborg, Göteborg, Sweden

    Anders Norström & Hans-Arne Hansson

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  1. Anders Norström
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  2. Hans-Arne Hansson
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The present study was supported by grants from “Svenska livförsäkringsbolags fond för medicinsk forskning”, The Swedish Medical Research Council (No. B73-12X-2543-05B), “Magnus Bergvalls stiftelse” and from the Medical Faculty, University of Göteborg.

Miss Gull Grönstedt is thanked for careful secretarial work and the technical assistance by Mrs. Wally Holmberg, Mrs. Elisabeth Norström and Mrs. Ulla Svedin is gratefully acknowledged.

Abbreviations used: NSG = neurosecretory granules; NSN = neurosecretory material; SON = supraoptic nucleus.

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Norström, A., Hansson, HA. Effects of colchicine on release of neurosecretory material from the posterior pituitary gland of the rat. Z.Zellforsch 142, 443–464 (1973). https://doi.org/10.1007/BF00306709

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