Ultrastructural alterations of human odontoblasts and collagen fibres in the pulpal border zone beneath early caries lesions.
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Child↗
Biomedical subjects
C Chavrier
Publications and source records attributed to C Chavrier.
[Collagen. 2. Physiologic and pathologic degradation].
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Animals↗
[Collagen. 1: biosynthesis and maturation].
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Aging↗
[Ultrastructure of the connective corium in hereditary gingival hyperplasia].
The ultrastructural study of the gingival lamina propria of 4 patients from the same family with hereditary gingival hyperplasia showed a density increase of the collagen fibres, a decrease in their mean diameter and the dissociation in sub-units of certain fibres whereas their periodicity was not altered. This study showed also the presence of elastic and oxytalan fibres in greater amounts than in normal gingiva, whereas the number of fibroblasts did not seem to increase. However these fibroblasts seemed to undergo modifications in relation to age and to secrete a large quantity of amyloid substance in the extracellular spaces. The glycoproteins and the glycosaminoglycans more abundant than in normal gingiva were not influenced by the age of the tissue.
Adolescent↗
[Ultrastructural demonstration of the phagocytic activity of periodontal ligament fibroblasts in the rat using enzymatic tracers].
The ultrastructural study of non-decalcified periodontal ligament of rats, labeled with horseradish peroxidase used as an enzymatic tracer for the mechanism of endocytosis, shows that there exists in the fibroblast, on the one hand, an endogeneous peroxidase revealed by the preparation and characteristic of certain cellular organelles: mitochondria, free ribosomes, ribosomes of the granular endoplasmic reticulum; and on the other hand an exogeneous peroxidase which demonstrates the ability of fibroblasts to phagocytose. This exogeneous peroxidase initially marks the collagen fibrils located in the extracellular medium, then at a later time he cytoplasmic membrane during its invagination, and finally the membrane of phagosomes. The intracellular collagen situated at the interior of phagosomes is also marked by the peroxidase and demonstrates the passage of the collagen from the extracellular medium to the intracellular medium.
Actin Cytoskeleton↗