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    A topographical study of the circadian rhythm in labelling index of mouse gingival and floor-of-mouth epithelium, including changes in labelling activity with individual cell position on the epithelial ridges.

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    Authors
    Kellett, M
    Hume, W J
    Potten, Christopher S
    Affiliation
    Department of Epithelial Biology, Paterson Institute for Cancer Research, Christie Hospital, Manchester, England.
    Issue Date
    1989
    
    Metadata
    Show full item record
    Abstract
    A continuous strip of epithelium from the mandibular teeth to the ventral surface of the tongue of B6D2F-1 mice was examined autoradiographically after tritiated thymidine flash-labelling. Five areas were defined: area 1, the gingival sulcus epithelium adjacent to tooth enamel; area 2, the free gingival margin epithelium; area 3, the attached gingiva; area 4, the floor of mouth with undulating basement membrane; area 5, the floor of mouth with flat basement membrane. Data for the circadian variation in the proportion of DNA synthetic cells were recorded into a microcomputer, which enabled a large number of cells to be scored. The topographical position of each basal cell along the rete ridges and the incidence of labelling were noted. In each of the five areas a statistically significant circadian variation in labelling index (LI) was demonstrated, with a peak at 04.00-06.00 h and a trough at 20.00 h, although area 1 was slightly out of phase with the rest. The 24-h average LI values were almost double those obtained from a single flash-labelling at 10.00 h. The peak to trough ratio in LI was greatest in area 5 and fell towards area 1. Within the attached gingiva, cells deepest in the epithelial ridges had a larger peak to trough ratio than more superficial basal cells. For a group of mice labelled at 10.00 h the mean LI of the basal epithelial cells in areas 1-5 was 7.5 +/- (3.0)% (SD). Various aspects of the distribution of DNA synthesis in relation to topography were examined.(ABSTRACT TRUNCATED AT 250 WORDS)
    Citation
    A topographical study of the circadian rhythm in labelling index of mouse gingival and floor-of-mouth epithelium, including changes in labelling activity with individual cell position on the epithelial ridges. 1989, 34 (5):321-8 Arch. Oral Biol.
    Journal
    Archives of Oral Biology
    URI
    http://hdl.handle.net/10541/110979
    DOI
    10.1016/0003-9969(89)90104-0
    PubMed ID
    2597026
    Type
    Article
    Language
    en
    ISSN
    0003-9969
    ae974a485f413a2113503eed53cd6c53
    10.1016/0003-9969(89)90104-0
    Scopus Count
    Collections
    All Paterson Institute for Cancer Research

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