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The neurophysin that is biosynthesised in association with the neurohypophysial hormone vasopressin (vasopressin-neurophysin) affects the growth and DNA synthesis of rat hypothalamic non-neuronal cells in culture. Over a narrow range of concentrations vasopressin-neurophysin stimulated growth, as assessed by increase in cell numbers, about five-fold, in conditions where fetal calf serum concentration was limiting (0.2% fetal calf serum). Maximum stimulation occurred in the presence of 20 to 30 ng vasopressin-neurophysin per ml of medium. DNA synthesis was increased by a factor of three in the presence of 30 ng vasopressin-neurophysin per ml of medium. At least two populations of non-neuronal hypothalamic cells were present in the cultures, and these were both affected by vasopressin-neurophysin. This study allows the suggestion that neurophysin may be acting as a growth-regulating factor at its release site, playing a part in the interactions of neurones and glial cells in the hypothalamo-neurohypophysial system.
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R T Worley, and
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R T Worley, and
B T Pickering
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R T Worley, and
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R T Worley, and
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R T Worley, and
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R T Worley, and
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R T Worley, and
B T Pickering
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