Occurrence of epidormal growth factor-binding sites during differentiation of cementoblasts and periodontal ligament fibroblasts of the young rat: A light and electron microscopic radioautographic study
Autor: | Wen-Lang Lin, Moon-Il Cho, Philias R. Garant |
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Rok vydání: | 1991 |
Předmět: |
Periodontal Ligament
medicine.medical_treatment Cementoblast Biology Iodine Radioisotopes stomatognathic system Epidermal growth factor Precursor cell medicine Animals Periodontal fiber Fibroblast Dental Cementum Dental follicle Binding Sites Epidermal Growth Factor Growth factor Mesenchymal stem cell Cell Differentiation Rats Inbred Strains Anatomy Fibroblasts Agricultural and Biological Sciences (miscellaneous) Rats Cell biology medicine.anatomical_structure Autoradiography |
Zdroj: | The Anatomical Record. 231:14-24 |
ISSN: | 1097-0185 0003-276X |
Popis: | Occurrence of epidermal growth factor (EGF)-binding sites during differentiation of cementoblasts and periodontal ligament (PDL) fibroblasts was investigated using radioautography after I. V. injection of 125I-EGF to 14-day-old rats. During differentiation of cementoblasts, a very low level of EGF-binding sites was present on the mesenchymal cells in dental follicle proper, precementoblasts, and cementoblasts. On the other hand, during differentiation of PDL fibroblasts, numerous EGF-binding sites were observed on the undifferentiated paravascular cells and on the perifollicular mesenchymes representing the major source of PDL fibroblast precursor cells. Also heavy labeling was observed throughout their differentiation to PDL fibroblasts, as well as during full synthetic activity as mature cells. Quantitative analysis of the light microscopic radioautographs revealed that these cells demonstrated approximately 4 grains per 100 microns 2 of cell area. These results suggest that EGF plays an important role in differentiation of PDL fibroblasts, but not in that of cementoblasts. Furthermore, the well-known in vivo effect of EGF in producing precocious eruption of teeth may be a consequence of a more extensive effect of EGF throughout differentiation of PDL fibroblasts as well as during full synthetic activity as mature cells. |
Databáze: | OpenAIRE |
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