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  • 1
    Electronic Resource
    Electronic Resource
    Development and general structure of the periodontium (2000)
    Copenhagen : Munksgaard International Publishers
    Periodontology 2000 24 (2000), S. 0 
    Details
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1034/j.1600-0757.2000.2240102.x
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  • 2
    Electronic Resource
    Electronic Resource
    Multinucleated fibroblastic cells in the periodontal ligaments of aged rats (1993)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 28 (1993), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Using 12- to 18-month -old rats, we examined the ultrastructural and cytochemical features of multinucleated fibroblastic cells (MFCs) in the periodontal ligament (PDL) of molars. In aged rats, the MFCs were distributed randomly in the PDL and exhibted cytoplasmic structural variations which were not dependent on the number of nuclei. There was a tendency for the MFCs to cluster in the PDL. The MFCs, rich in cytoplasmic organelles involved with procollagen synthesis such a rought endoplasmic reticulum and the Golgi apparatus, incorporated and secreated 3H-prolince-labled products. The MFcs also possessed many phagosomes containing intact collagen fibrils.n These MFCs were apparently involved in phagocytosis and intracellular degradation of incorporated collagen fibrils. Phagosome-rich MFCs contain acid phosphatase activity in primary and secondary lysosomes, similar ro stronger in intensity to that which can be demonstrated in mononuclear fibroblasts. However, unlike mononuclear fibroblasts, the MFcs did not exhibit alkaline phosphatase acitivity along their plasma membranes. These results suggest that MFcs demonstrate a range of fibroblastic cellular activity, including collagen phagocytosis, and that they may lack certain plasma membrane glycoproteins, which might explain the occurrence of multinucleation in these cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1993.tb01052.x
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  • 3
    Electronic Resource
    Electronic Resource
    Immunocytochemical localization of extracellular matrix components in beagle periodontium: I. Collagen types I and III in healthy gingival connective tissue (1987)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 22 (1987), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The localization and identification of types I and III collagen in healthy gingival connective tissue of the beagle dog were investigated using indirect immunofluore-scent and immunoferritin electron microscopic techniques with affinity purified antibody or IgG. Type I collagen was evenly distributed throughout the lamina propria and the underlying connective tissue in the form of thick collagen fibers. In the lamina propria, these fibers appeared to run from the underlying connective tissue in a perpendicular orientation to the overlying gingival epithelium. Localization of type III collagen was restricted to the lamina propria and the connective tissue around blood vessels. Immunoferritin electron microscopy clearly revealed that type I collagen fibrils have a diameter ranging from 40 to 100 nm and a clear 640 Å cross-banding pattern. Thin and short collagen fibrils, 18 to 32 nm in diameter, were labelled with antitype III collagen IgG. A 640 Å cross-banding pattern was rarely observed in these fibrils. Type III collagen fibrils coexisted with type I collagen fibrils in a mixed pattern within the lamina propria and the perivascular space.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1987.tb01591.x
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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    A freeze-fracture study of the periodontal ligament of the rat (1983)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 18 (1983), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Fibroblasts of the rat periodontal ligament were studied in situ by the freeze-fracture technique. Large surfaces of the protoplasmic and extracellular faces of the cell membrane as well as, the membranes of the RER, Golgi apparatus, and other cytoplasmic organelles were viewed at the ultrastructural level. Intramembrane particles representing membrane proteins were visualized, and their concentration in various membranes measured.Features of the fibroblast cell surface appearing as rough patches were interpreted to represent areas of possible cell-to-matrix interaction. The use of the freeze-fracture technique in further studies of PDL fibroblast-matrix contact is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1983.tb00359.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of colchicine on periodontal ligament fibroblasts of the mouse (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 17 (1982), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: The effects of colchicine administration on the ultrastructure aad function of periodontal ligament fibroblasts was studied in young mice as a further attempt to document the microtubule-dependent nature of collagen secretory granule translocation.Disruption of the normal appearance of the Golgi complex was an early response to colchicine administration. This change was visible at the light microscopic level. At the electron microscopic level it was observed that Golgi saccules were dispersed and that Golgi cisternae were shorter and reduced in number. Microtubules were absent. Dense granules accumulated in a juxtanuclear region of cytoplasm previously occupied by the normal Golgi complex. Lipid droplets and autophagosomes were increased in number. Intermediate filaments (10 nm diameter) formed perinuclear fascicles several hours after colchicine treatment.These results as well as the recently published report (Cho & Garant 1981d) support the concept that microtubules play an important role in the normal organization of the Golgi complex and in the translocation of secretory granules to the fibroblast cell surface.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1982.tb01170.x
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  • 7
    Electronic Resource
    Electronic Resource
    Attachment of periodontal ligament fibroblasts to the extracellular matrix in the squirrel monkey (1982)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 17 (1982), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Fibroblasts of the transseptal fiber region of the periodontal ligament contain well developed bundles of microfilaments or stress fibers. The stress fibers are made up of numerous parallel and closely packed cytoplasmic filaments approximately 6 nm wide. These intra-cellular stress fibers appear to be connected to and colinear with extracellular non-striated microfibrils. The junction occurs at a juxta-membrane dense patch called the fibronexus (Singer 1979).Similar associations of cytoplasmic microfilament bundles and the attachment protein fibronectin have been shown by other investigators to be necessary for cell attachment to substrata and oriented cell migration in fibroblasts cultured in vitro.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1982.tb01132.x
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  • 8
    Electronic Resource
    Electronic Resource
    Immunocytochemical in vivo localization of fibronectin-rich contact sites on fibroblasts of normal periodontal ligament and inflamed gingiva (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 23 (1988), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Fibroblast-to-matrix attachment sites were studied by routine electron microscopy and immunocytochemistry. Rabbit antibodies to beagle dog plasma fibronectin and sheep antirabbit antibodies conjugated with horseradish peroxidase or ferritin were used to localize fibronectin at fibroblast-to-matrix attachment sites. In fibroblasts of healthy periodontal ligament, the attachment sites consisted of rectangular patches of amorphous material juxtaposed to the external surface of the plasma membrane. At these sites, the cell membrane was more densely stained and the adjacent cytoplasm was characterized by increased density and a high concentration of cytoplasmic filaments. The extracellular plaques contained fibronectin. Morphometric analysis indicated that the attachment plaques were approximately 90 nm thick, 250 nm wide, and 550 nm long, and distributed uniformly over both the cell body and peripheral cytoplasmic processes. In inflamed gingiva, the attachment sites were larger, irregular in shape, and with greater amounts of extracellular amorphous material and fibronectin associated to the cell surface. Cytoplasmic filaments were more often bundled as stress fibers which terminated in fibronexus-type junctions with extracellular fibronectin-coated filaments.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1988.tb01364.x
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  • 9
    Electronic Resource
    Electronic Resource
    Ultrastructural evidence of directed cell migration during initial cementoblast differentiation in root formation (1988)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of periodontal research 23 (1988), S. 0 
    Details
    ISSN: 1600-0765
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Root formation in 14-day-old Sprague-Dawley rats was studied by light and electron microscopy. Special attention was focused on initial cementoblast differentiation. Disruption of the epithelial root sheath appears to be a consequence of directed cell migration by cells of the dental follicle proper which undergo differentiation into precementoblasts. Precementoblasts rapidly develop polarity towards the dentin, exhibiting major cytoplasmic processes rich in cytoplasmic filaments. These processes grow toward and eventually contact the dentin matrix. It is suggested that the cells of the dental follicle proper are cementoblast precursors which respond to chemoattractant substances released from newly deposited dentin matrix- and/or basal lamina-associated material of root sheath origin.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-0765.1988.tb01371.x
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  • 10
    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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