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  • Dopamine  (1)
  • Neurosecretion  (1)
  • Springer  (2)
  • American Association of Petroleum Geologists
  • American Geophysical Union (AGU)
  • Oxford University Press
  • 1980-1984  (2)
  • 1935-1939
Collection
Publisher
  • Springer  (2)
  • American Association of Petroleum Geologists
  • American Geophysical Union (AGU)
  • Oxford University Press
Years
  • 1980-1984  (2)
  • 1935-1939
Year
  • 1
    ISSN: 1432-0827
    Keywords: Isoproterenol ; Dopamine ; Propranolol ; PTH ; Calcitonin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary Available evidencein vitro andin vivo suggests that pharmacologic doses of isoproterenol stimulate the secretion of parathyroid hormone (PTH) and calcitonin (CT) and propranolol inhibits secretion. However, the findings in man are either quite modest or inconsistent. In view of this controversy, we examined the effects of isoproterenol, 0.15 µg intradermally (i.d.), dopamine, 5 µg/kg body weight over 60 min intravenously (i.v.), and propranolol, 1 mg over 5 min followed by 60 µg per min for 2 i.v. in normal human subjects. It was found that these agents did not alter serum calcium, serum immunoreactive PTH, or plasma immunoreactive CT. The findings do not support a physiologic role for biogenic amines in the control and regulation of PTH or CT secretion in normal man.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Cell & tissue research 233 (1983), S. 99-111 
    ISSN: 1432-0878
    Keywords: Neurosecretion ; Vasopression ; Osmotic stress ; RIA ; Immunocytochemistry
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary A correlative radioimmunoassay (RIA) and immunocytochemical (ICC) study was carried out on vasopressin (VP) distribution and content in brains of normal and 3-day water-deprived rats. By RIA there were statistically significant differences in brain VP per pg/mg between normal and osmotically stressed specimens in hypothalamus (338.4 versus 134.4), thalamus (4.8 versus 0.9), septum (18.0 versus 3.4), striatum (1.6 versus 0.7) and amygdala (17.3 versus 1.3), but not in other brain regions measured. Pituitary VP decreased from 71.1 to 8.7 ng/mg, and plasma VP rose from 3.6 to 19.3 pg/ml during water deprivation. Application of the peroxidase-anti-peroxidase ICC method of Sternberger to vibratome sections showed that VP-immunoreactivity in dehydrated specimens decreased in perikarya of paraventricular nucleus and suprachiasmatic nucleus, while intrahypothalamic immunoreactive magnocellular fibers appeared more conspicuous due to proliferation of large Herring bodies. In extrahypothalamic sites VP-immunoreactivity in water-deprived rats was visibly reduced in periventricular thalamus and septum. Thus it is apparent that both intra- and extrahypothalamic VP are affected by osmotic stress, and these results are discussed within the context of current ideas relating to co-activation of neurosecretory cells that project to different sites.
    Type of Medium: Electronic Resource
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