Temporo-spatial distribution of matrix and microfilament components during odontoblast and ameloblast differentiation |
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Authors: | Marie-Dominique Kubler Hervé Lesot Jean Victor Ruch |
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Institution: | (1) Faculté de Médecine, Institut de Biologie Médicale, CNRS LP 6520, 11 rue Humann, F-67085 Strasbourg Cedex, France |
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Abstract: | Summary Several extracellular matrix components (procollagen type III, fibronectin, collagen type IV, laminin and nidogen) and microfilament
constituents (actin, α-actinin and vinculin) were localized by indirect immunofluorescence microscopy in frozen sections of
embryonic mouse molars. Nidogen was present at the epithelio-mesenchymal junction during polarization and initial steps of
functional differentiation of odontoblasts. Nidogen disappeared at a stage where direct contacts between preameloblasts and
predentin were required to allow the initiation of ameloblast polarization. Our observations concerning the distribution of
procollagen type III and fibronectin during odontoblast differentiation add to current knowledge. Procollagen type III and
fibronectin surrounding preodontoblasts accumulated at the apical part of polarizing and functional odontoblasts secreting
“initial” predentin. Procollagen type III, but not fibronectin, disappeared in front of functional odontoblasts synthesizing
“late” predentin and dentin. Fibronectin, present in “initial” predentin, was no longer detected in “late” predentin and dentin
but was found between odontoblasts secreting “late” predentin and dentin. Actin, α-actinin and vinculin were concentrated
in the peripheral cytoplasm of preameloblasts and accumulated at the apical and basal poles of functional ameloblasts. During
differentiation of odontoblasts, the three proteins accumulated at the apical pole of these cells. Time and space correlations
between matrix and microfilament modifications during odontoblast and ameloblast differentiation are documented. The possibility
is discussed that there is transmembranous control of the cytoskeletal activities of odontoblasts and ameloblasts by the extracellular
matrix. |
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Keywords: | Odontoblast Ameloblast Matrix Cytoskeleton Immunofluorescence |
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