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  • 1975-1979  (3)
  • 1976  (3)
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Erscheinungszeitraum
  • 1975-1979  (3)
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  • 1
    Digitale Medien
    Digitale Medien
    Influence of sodium chloride on the amount of CRF-granules and “classical” neurosecretory material (NSM) in the neurohypophysis of bilaterally adrenalectomized rats (1976)
    Springer
    Anatomy and embryology 149 (1976), S. 307-313 
    Details
    ISSN: 1432-0568
    Schlagwort(e): CRF-granules ; Sodium chloride ; Adrenalectomy ; Rat ; Histology
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Medizin
    Notizen: Summary Bilaterally adrenalectomized female SPF Wistar rats were given tap water containing various concentrations of sodium chloride to drink ad lib. After a survival period of 14 days the animals were killed by perfusion-fixation. Their brains were removed, fixed in pieric acid formalin solution and embedded in Paraplast. Serial sections of median eminence and hypophysial posterior lobe were cut and stained with crotonaldehyde-fuchsine. In the stained sections the amount of CRF-granules visible in the external zone of the median eminence, and the amount of “classical” neurosecretory material (NSM) occuring in the internal zone of the median eminence and in the posterior lobe of the hypophysis were estimated. After administration of drinking solutions to which 0%–1% sodium chloride were added, the amount of CRF-granules increased with increasing NaCl uptake, whereas the amount of “classical” NSM was not changed. Application of tap water containing 2% NaCl led to a marked decrease in the amount of “classical” NSM but did only slightly impair the amount of CRF-granules. From the findings it is concluded that 1. following bilateral adrenalectomy administration of sodium chloride inhibits the secretion of CRF-granules; 2. CRF-granules and “classical” NSM, although histochemical identical, have different functional significances; 3. the mechanisms regulating the secretion of CRF-granules are different from those controlling the release of “classical” NSM.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00315446
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Histochemical and immunohistochemical properties of the CRF-Granules and other „Gomori-positive” substances of the rat (1976)
    Springer
    Histochemistry and cell biology 46 (1976), S. 81-105 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary In adrenalectomized rats, histochemical and immunohistochemical properties of the following secretion products have been investigated: 1. CRF-granules in the outer layer of the median eminence; 2. neurosecretory material (NSM) in the supraoptico-hypophysial system of the hypothalamus; 3. secretory granules in the TSH-cells of the anterior lobe of the hypophysis; 4. secretory granules in the ependymal cells of the subcommissural organ (SCO); 5. β-cell-granules in the islets of Langerhans in the pancreas. All these substances are characterized by their stainability with the so-called “Gomorimethod”. The experiments have included studies into: a) the extractability of the substances by various solvents; b) the digestability of the substances by pepsin or trypsin; c) their histochemically detectable content of disulfide groups, arginine and periodic acid-Schiff (PAS) reactive carbohydrates; d) their reaction with porcine-neurophysin-II-antibodies. All substances exhibited a positive reaction for disulfide groups. Based on their solutility properties, their resistance to pepsin or trypsin, their respective content of PAS-reactive carbohydrates and their failure to react with anti-neurophysin serum the “Gomori-positive” granules in TSH-, SCO- and pancreatic β-cells can be distinguished from one another and from CRF- and neurosecretory granules. In contrast, CRF-granules and NSM showed identical properties. Taking into consideration data from the biochemical and histochemical literature, the present findings suggest that CRF-granules and NSM consist of closely related biochemical substances.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF02462734
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  • 3
    Digitale Medien
    Digitale Medien
    Distribution and properties of an adenosine triphosphatase in the tanycyte ependyma of the IIIrd ventricle of the rat (1976)
    Springer
    Histochemistry and cell biology 47 (1976), S. 145-157 
    Details
    ISSN: 1432-119X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Medizin
    Notizen: Summary The distribution, histochemical properties and ultrastructural localization of adenosine triphosphate (ATP) hydrolyzing enzymes in the tanycyte ependyma of the third ventricle have been studied in female Wistar rats. Using a calcium-cobalt procedure and a lead capture technique, splitting of ATP could be demonstrated in perikarya and processes of tanycytes in the region of the ventromedial nucleus. The reaction showed no dependence on magnesium or sodium ions, did not occur with other monodi-, and tri-phosphates as substrates, and was inhibited by p-chlormercuribenzoate (PCMB) and sodium fluoride, but not by ouabain. With the calciumcobalt method the highest intensity of reaction was found at pH 9.4, whereas the lead method gave optimal results at pH 6–8. At the ultrastructural level, the reaction product was found at the outer surface of the plasma membranes of tanycytes and reached its highest concentrations in the region of the apical microvilli. From the findings it is concluded that splitting of ATP in tanycytes is due to a true ATPase. The enzyme might be involved in an active transport of substances by tanycytes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00492562
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