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Ectopic mineralization in fibroblast cultures.
Summary
Human gingival fibroblasts exhibit ectopic mineralization, initiating within intracellular vesicles. These mineral deposits are extruded, forming extracellular matrices, highlighting the role of cellular vesicles in calcification.
Area of Science:
- Cell Biology
- Biomineralization
- Tissue Engineering
Background:
- Ectopic mineralization in fibroblasts is a poorly understood process.
- Understanding cellular mechanisms of biomineralization is crucial for regenerative medicine.
Purpose of the Study:
- To investigate the ultrastructural mechanisms of intracellular and extracellular ectopic mineralization in human gingival fibroblasts.
- To elucidate the role of cellular vesicles in initiating and regulating biomineralization.
Main Methods:
- Culturing human gingival fibroblasts in DM-153 medium with bovine serum.
- Utilizing transmission electron microscopy for ultrastructural analysis of mineralization.
- Observing both intracellular and extracellular mineral deposition.
Main Results:
- Mineralization initiated within intracellular vesicles in cytoplasmic vacuoles.
- Needle-shaped crystals formed on vesicle membranes, growing into mineralized spherules.
- Crystal clusters were extruded from cells, forming extracellular matrices.
- Extracellular mineral deposition occurred within matrix vesicles, independent of collagen or elastic fibers.
Conclusions:
- Mineral accumulation and phase transformation occur within cellular vesicular structures.
- Cell-derived membranous vesicles are essential for the initiation of calcification and mineralization.
- Fibroblast-derived vesicles play a critical role in both intracellular and extracellular biomineralization processes.