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  • Parathyroid  (3)
  • Protein A-gold technique  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Effects of short-term treatment with calcium on the parathyroid gland of the rat, under particular consideration of the alteration of storage granules (1985)
    Springer
    Cell & tissue research 240 (1985), S. 9-17 
    Details
    ISSN: 1432-0878
    Keywords: Parathyroid ; Storage granule ; Hypercalcemia ; Immunocytochemistry ; Acid phosphatase ; Rat
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Short-term effects of CaCl2-treatment on parathyroid cells of the rat, especially on their storage granules, were studied at the ultrastructural level. After an injection of 4% CaCl2, serum calcium levels (SCL) rapidly increased from 9.1 mg/dl (controls) to a maximum of 14.9 mg/dl at 20 min. At 5 min after the injection, the number of type-I storage granules (large core) [NSG-I] and that of type-II storage granules (small core) [NSG-II] remained unchanged, in spite of elevated SCL (12.4 mg/dl). As soon as SCL rose to 13.2 mg/dl at 7.5 min, NSG-I gradually decreased to a minimum at 30 min; in contrast, NSG-II gradually increased to a maximum at 30 min. Vacuolar bodies also increased together with the augmentation of type-II storage granules. The average diameter of the core of the storage granules decreased significantly after the injection. Protein A-gold method for immunocytochemistry showed that the cores of these granules contain parathormone. Acid-phosphatase activity was occasionally found in storage granules of both types, especially in those of type II. It is concluded (i) that type-I storage granules may be transformed into vacuolar bodies via type-II granules as a result of hydrolysis, and (ii) that these processes may be accelerated during hypercalcemia.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00217552
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  • 2
    Electronic Resource
    Electronic Resource
    Immunocytochemical localization of parathormone in the mammalian parathyroid gland using the protein A-gold technique (1986)
    Springer
    Cell & tissue research 243 (1986), S. 3-7 
    Details
    ISSN: 1432-0878
    Keywords: Parathyroid gland ; Protein A-gold technique ; Ultrastructure ; Storage granules ; Mammals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Electron-microscopic immunocytochemistry for the demonstration of parathormone in parathyroid chief cells was performed in adult male rats, gerbils, mice, and dogs, using the protein A-gold technique. Protein A-gold particles were detected over both large and small secretory granules in all the animals examined. In the former, they were concentrated not only over type-I granules with a large core, but also over type-II granules with a small core. They were also located over atypical granules, including heterogeneously dense granules, granules having vesicles in a finely particulate core, and distorted granules. All labelled secretory granules were characterized by the presence of a clear halo of varying width around the core. Occasionally, Golgi cisternae as well as Golgi vacuoles with a finely particular content were also labelled. The labelling of the secretory granules was strong in dogs, moderate in rats and gerbils, and weak in mice. In addition, it was more intense in the non-osmicated preparations than in the osmicated preparations. The frequency of both types of large granules showed species differences. The possible factors involved in these differences are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00221846
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  • 3
    Electronic Resource
    Electronic Resource
    Electron-microscopic studies on the threshold value of calcium concentration for the release of storage granules and the acceleration of their degradation in the rat parathyroid gland (1988)
    Springer
    Cell & tissue research 251 (1988), S. 531-539 
    Details
    ISSN: 1432-0878
    Keywords: Parathyroid ; Storage granule ; Discharge ; Degradation ; Calcium concentration ; Trans Golgi network ; Rat (Wistar)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary To determine both a threshold value of calcium concentration (CC) for the release of storage granules and that for the acceleration of degradation of these granules, the rat parathyroid glands were perfused in situ with HEPES-Ringer solutions containing different concentration of Ca2+ for 10 min. With perfusates containing 0.83–1.21 mM Ca2+ (equivalent to 8–11 mg/dl serum calcium), the number of type-I storage granules (large core) [NSG-I] and that of type-II storage granules (small core) [NSG-II] remained unchanged. With perfusates containing 0.83 mM Ca2+ (7.5 mg/dl) or less, however, both NSG-I and NSG-II decreased remarkably and the former was larger than the latter. On the contrary, with perfusates containing 1.27 mM Ca2+ (11.5 mg/dl) or more, NSG-II increased and the ratio of NSG-I to NSG-II was changed reversely. We concluded that a thereshold value of CC required for the release of storage granules may be present between 0.88 and 0.83 mM Ca2+ (8 and 7.5 mg/dl) and that a threshold value of CC for accelerating the transformation of type-I granules into type-II, the degradation of storage granules, may be situated at about 1.27 mM Ca2+ (11.5 mg/dl). Additionally, it was suggested that both prosecretory and storage granules are not only formed at the innermost Golgi cisterna but also at the trans-Golgi network.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00214000
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  • 4
    Electronic Resource
    Electronic Resource
    Freeze-fracture study of the rat parathyroid gland under hypo- and hypercalcemic conditions, with special reference to secretory granules (1983)
    Springer
    Cell & tissue research 228 (1983), S. 219-230 
    Details
    ISSN: 1432-0878
    Keywords: Rat ; Parathyroid ; Freeze-fracture ; Storage granule ; Exocytosis ; Endocytosis ; Discharged secretory granule
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Freeze-fracture images of the parenchymal cells in the parathyroid gland of rats were observed after vitamin D2 plus calcium chloride-suppression and EGTA-activation of secretion. In cells of the suppressed glands, large bulges protruded from the Golgi cisternae, and large granules with a stalk, which are identified as storage granules, suggest that, during maturation, some storage granules may be connected by long tubules with the Golgi cisternae and supplied with secretory products from the Golgi cisternae via these tubules. In the activated glands, presumptive exocytotic and endocytotic specializations of intramembranous particles of the parenchymal cell plasma membrane were frequently observed. In addition, elevations and complementary shallow depressions of various shape and extent were occasionally encountered in the intercellular space. From their morphological characteristics it was concluded that these originated from secretory granule cores, which are discharged from the parenchymal cells into the intercellular space by exocytosis, and it was suggested that discharged granule cores may retain their spherical shape until they fuse to form a flat conglomerate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00204874
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