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Immunoreactive calbindin-D9K in bone matrix vesicle.

N Balmain1, D Hotton, P Cuisinier-Gleizes

  • 1INSERM-U.120, alliée CNRS-SDI I19261, Hôpital Robert Debré, Paris, France.

Histochemistry
|January 1, 1991
PubMed
Summary
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Calbindin-D9K, a vitamin-D-dependent protein, is found in bone cells and matrix vesicles. This protein appears crucial for normal bone mineralization and may play a role in abnormal intracellular calcification.

Area of Science:

  • Bone Biology
  • Mineral Metabolism
  • Cellular Ultrastructure

Background:

  • Calbindin-D9K is a vitamin-D-dependent calcium-binding protein.
  • Its role in bone mineralization is not fully understood.
  • Osteoblasts and osteocytes are key cells in bone formation and remodeling.

Purpose of the Study:

  • To investigate the subcellular localization of calbindin-D9K in rat bone.
  • To determine the relationship between calbindin-D9K and bone mineralization.
  • To assess the vitamin-D dependency of calbindin-D9K in bone.

Main Methods:

  • Subcellular localization using electron microscopy and immunogold labeling (protein A-gold method).
  • Analysis of normal, vitamin-D-deficient rachitic, and treated rachitic rat bone.

Related Experiment Videos

  • Lowicryl K4M embedding for undecalcified bone samples.

    • Main Results:

    • Immunoreactive calbindin-D9K was found in osteoblasts, osteocytes, and bone matrix vesicles.
    • Localization was observed over initial crystallites in matrix vesicles and in mature bone.
    • Calbindin-D9K presence in osteoblasts and matrix vesicles was vitamin-D-dependent, correlating with crystallite reappearance after 1,25-(OH)2D3 treatment.

    Conclusions:

    • Immunoreactive calbindin-D9K is involved in the mineral deposition process within bone matrix vesicles.
    • The protein's presence is vitamin-D-dependent in bone cells and matrix vesicles.
    • Abnormal intracellular calcification in osteoblasts suggests a role for calbindin-D9K in aberrant mineral deposition.