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Ultrastructure of basement membranes in developing shark tooth
1Department of Ultrastructural Science, Tokyo Dental College, Masago 1-2-2, Mihama-ku, Chiba City 261-8502, Japan. sawada@tdc.ac.jp
Calcified Tissue International
|October 9, 2002
Summary
Shark tooth basement membranes share key roles with mammalian teeth, aiding development and mineralization. These findings offer insights into evolutionary tooth formation processes.
Area of Science:
- Developmental Biology
- Comparative Odontology
- Biomineralization
Background:
- Dental basement membranes are crucial for mammalian tooth development and maintenance.
- Comparative studies with non-mammalian teeth can clarify mammalian odontogenesis mechanisms.
Purpose of the Study:
- To ultrastructurally examine shark tooth basement membranes during development.
- To elucidate the roles of basement membranes in shark odontogenesis.
Main Methods:
- Thin section electron microscopy of shark teeth (Cephaloscyllium umbratile) at successive developmental stages.
Main Results:
- Shark tooth lamina densa, composed of "cords," resembles mammalian basement membranes.
- Basement membranes anchor cells, bind to enameloid precursors, and facilitate matrix transport and mineralization.
- Mineralization of the lamina densa aids organic-mineral phase transition for enameloid maturation.
Conclusions:
- Shark tooth basement membranes perform vital roles analogous to mammalian teeth.
- These roles include anchoring, binding, and mediating substance transport for tooth development.
- The study enhances understanding of evolutionary odontogenesis and biomineralization.