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Phospholipids in amelogenesis and dentinogenesis.

M Goldberg1, D Septier

  • 1Laboratoire de Biologie et Physiopathologie Crânio-Faciale EA 2496, Groupe Matrices Extracellulaires et Biominéralisation, Faculté de Chirurgie Dentaire-Université Paris V, Montrouge, France. mgoldod@aol.com

Critical Reviews in Oral Biology and Medicine : an Official Publication of the American Association of Oral Biologists
|July 2, 2002
PubMed
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It is time to move on.....

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Phospholipids are crucial for dental tissue formation and mineralization. These lipids are found in both intracellular and extracellular compartments, playing key roles in cell regulation and the mineralized matrix.

Area of Science:

  • Biochemistry
  • Dental Tissues
  • Mineralization

Background:

  • Phospholipids are present in enamel and dentin, with distinct roles before and after demineralization.
  • Intracellular phospholipids are linked to cell growth and regulation, while extracellular ones associate with the mineralized phase.

Purpose of the Study:

  • To investigate the localization and function of phospholipids in dental tissues.
  • To elucidate the role of phospholipids in the formation and mineralization of enamel and dentin.

Main Methods:

  • Utilized imidazole-osmium tetroxide fixation to stain unsaturated fatty acids in rat incisors.
  • Employed filipin to visualize cholesterol distribution and membrane remnants.
  • Applied malachite-green-glutaraldehyde (MGA) and iodoplatinate (IP) reactions to detect extracellular phospholipids.

Related Experiment Videos

  • Conducted radioautography with [3H] choline to trace phospholipid transport.

    • Main Results:

    • Visualized membrane domains, coated pits, and endocytic inclusions using specific staining techniques.
    • Identified phospholipids in predentin as granules, filaments, and liposome-like structures between collagen fibrils.
    • Observed organic envelopes ('crystal-ghost' structures) coating mineral crystals in dentin.
    • Demonstrated rapid uptake of blood-serum-labeled phospholipids in dentin, preceding cellular synthesis.

    Conclusions:

    • Phospholipids are integral components of dental tissues, involved in both cellular processes and the extracellular matrix.
    • Evidence suggests phospholipids interact with proteoglycans and are critical for dental mineralization.
    • Rapid transport of phospholipids from serum to dentin indicates their essential role in tissue development.