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  • 1985-1989  (6)
  • 1
    Electronic Resource
    Electronic Resource
    Mirror symmetry of newly divided rat periodontal ligament fibroblasts in situ and its relationship to cell migration (1985)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 20 (1985), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: A dramatic increase in proliferation of endothelial, paravascular cells, and PDL fibroblasts occurs during orthodontic tooth movement. The development of mirror symmetry in newly divided fibroblast daughter cell pairs in the rat periodontal ligament was studied.Periodontal ligament fibroblasts loose their polarity and the normal organization of their organelles during cell division. Daughter cells, however, regain polarity and organization of their organelles to form mirror images of each other within 10 hours after cell division starts. Cellular polarity begins to appear with projection of a distal cell process at late telophase. Polarization is completed between late telophase and cytokinesis by shifting the RER and Golgi complex from the cleavage plane area to a juxtanuclear position facing the distal cell process. The majority of the newly divided fibroblasts formed mirror images in orientation and organization of organelles prior to cell migration. The distal cell process is the leading edge; i.e., the nuclear-Golgi axis points toward the direction of movement.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1985.tb00425.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Radioautographic analysis of 3H-fucose utilization by fibroblasts of the periodontal ligament (1986)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 21 (1986), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The secretion of 3labeld glycoproteins from periodontal ligament fibroblasts was, studied by light and electron microseopic radioautography. At 5, 10. and 20 minutes after intravenous injection, 3H-fucose was concentrated in Golgi cisternae and saccules. By 35 minutes, the label was dispersed to the cell periphery and extracellular matrix. At 8 hours after injection, almost all of the radioactive label was associated with the cell surface or the adjacent extracellular matrix. Labeled glycoprotein was contained in collagen secretion granules and appeared to be relesasd simultaneousley with the collagen precursors The distribution of 3H-fucose labeled material was uniform across the periodontal ligament.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1986.tb01439.x
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Radioautographic demonstration of receptors for epidermal growth factor in various cells of the oral cavity (1988)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 222 (1988), S. 191-200 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: Mouse iodinated epidermal growth factor (EGF) was localized by light and electron microscopic radioautography in basal cells of oral epithelium, papillary cells of the enamel organ, periodontal ligament fibroblasts, preodontoblast precursor cells, and preosteoblasts of the alveolar bone of 13-day-old Sprague-Dawley rats. The specificity of binding in these cells was suggested by an observed reduction of about 90% in the labeling when excess unlabeled EGF was injected along with the 125I-EGF. In contrast, fully differentiated cells, such as ameloblasts, odontoblasts, and osteoblasts, were only poorly labeled. Quantitative analysis of the light microscopic radioautographs revealed that the papillary cells had the highest level of labeling (5.5 grains per 100 μm2 of cell area). The significance of the rather high labeling of the preosteoblasts of the alveolar bone and the fibroblasts of the periodontal ligament is unknown. However, the well-known effect of EGF in producing precocious eruption of teeth may be a consequence of an effect on these two cell types.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092220212
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Effects of L-azetidine-2-carboxylic acid on matrix secretion and Golgi structure in fibroblasts and osteoblasts of the mouse (1985)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 212 (1985), S. 232-238 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The effect of a proline analogue, L-azetidine-2-carboxylic acid (LACA), on collagenous matrix secretion by periodontal ligament fibroblasts and alveolar bone osteoblasts was studied by light and electron microscopic radioautography after injection of 3H-glycine; 3H-glycine labeled material accumulated in the cisternae of the rough endoplasmic reticulum and was not secreted for over 4 hours.The Golgi complex of both fibroblasts and osteoblasts showed a marked alteration of its composition after LACA administration. All Golgi saccules and collagen secretion granules disappeared within 2 hours. Flattened Golgi cisternae were still present and appeared to be unaffected by the administration of LACA.These observations indicate that Golgi saccules in collagen-secreting cells are the initial staging areas for the formation of collagen secretory granules and that there is a close correlation between form and function in the Golgi apparatus of collagensecreting cells.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092120303
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    3H-mannose utilization by fibroblasts of the periodontal ligament (1987)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 218 (1987), S. 5-13 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The synthesis, intracellular translocation, and secretion of mannose-containing glycoproteins(s) by periodontal ligament fibroblasts have been investigated by means of electron microscopic radioautography. Tritiated mannose was administered to young mice via jugular vein, and radioautographs were prepared at 5, 10, 20, and 35 minutes, 4 and 8 hours after injection. Analysis of electron microscopic radioautographs revealed a maximum labeling (94%) with 3H-mannose of the rough endoplasmic reticulum at 5 minutes. Labeling of the Golgi components started to increase from 10 minutes (14%) and reached a maximum level at 20 minutes (31.2%). At 35 minutes, secretion granules, dense bodies, profiles of intracellular collagen, and the cell surface were labeled. At 8 hours, most labelling (79.2%) was extracellular, and associated either with the collagenous matrix (43.7%) or the cell surface (35.5%). Cytoplasmic vesicles containing dense materials around collagen fibrils were also labeled at 8 hours. It is concluded that mannose is directly incorporated into the rough endoplasmic reticulum (RER), and that mannose-containing glycoprotein(s) are packaged in the Golgi apparatus into secretory granules. Mannose-containing glycoproteins(s) become distributed on the periodontal ligament (PDL) fibroblast cell surface, cytoplasmic dense bodies, and the extracellular matrix.
    Additional Material: 13 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092180103
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Radioautographic study of [3H]mannose utilization during cementoblast differentiation, formation of acellular cementuum, and development of periodontal ligament principal fibers (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 223 (1989), S. 209-222 
    Details
    ISSN: 0003-276X
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The formation of acellular cementum and the deposition of [3H]mannose-labeled extracellular matrix were studied in 14-day-old Sprague-Dawley rats. The sequential events of cementogenesis and periodontal ligament formation observed by light and electron microscopy were described from the stage of an intact root sheath to postcementogenesis. Ultrastructural examination of cementoblasts and periodontal ligament fibroblasts revealed [3H]mannose labeling of the Golgi apparatus at 10 minutes, collagen secretion granules at 30 minutes, and the extracellular matrix beginning at 30 minutes. The extracellular matrix between cementoblasts and dentin was heavily labeled at 1 and 4 hours. Newly formed principal fibers of the periodontal ligament were also heavily labeled at 4 hours. Fully differentiated cementoblasts exhibited the largest sectional profiles and the highest number of silver grains per unit area of cytoplasm. The morphologic and radioautographic data suggest that during the formation of acellular cementum, the cementoblast phenotype is expressed for a short period of time, after which cementoblasts appear to mix with the fibroblasts of the periodontal ligament.
    Additional Material: 14 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092230214
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    Paper (German National Licenses)
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