Cited by 272Alkaline Phosphatase Research StudiesCalcium Carbonate Crystallization and InhibitionBone and Dental Protein Studies

Bone mineralization proceeds through intracellular calcium phosphate loaded vesicles: A cryo-electron microscopy study

Mahamid, Julia, Sharir, Amnon, Gur, Dvir, Zelzer, Elazar, Addadi, Lia, Weiner, Steve·2011·Journal of Structural Biology

Abstract

Bone is the most widespread mineralized tissue in vertebrates and its formation is orchestrated by specialized cells - the osteoblasts. Crystalline carbonated hydroxyapatite, an inorganic calcium phosphate mineral, constitutes a substantial fraction of mature bone tissue. Yet key aspects of the mineral formation mechanism, transport pathways and deposition in the extracellular matrix remain unidentified. Using cryo-electron microscopy on native frozen-hydrated tissues we show that during mineralization of developing mouse calvaria and long bones, bone-lining cells concentrate membrane-bound mineral granules within intracellular vesicles. Elemental analysis and electron diffraction show that the intracellular mineral granules consist of disordered calcium phosphate, a highly metastable phase and a potential precursor of carbonated hydroxyapatite. The intracellular mineral contains considerably less calcium than expected for synthetic amorphous calcium phosphate, suggesting the presence of a cellular mechanism by which phosphate entities are first formed and thereafter gradually sequester calcium within the vesicles. We thus demonstrate that in vivo osteoblasts actively produce disordered mineral packets within intracellular vesicles for mineralization of the extracellular developing bone tissue. The use of a highly disordered precursor mineral phase that later crystallizes within an extracellular matrix is a strategy employed in the formation of fish fin bones and by various invertebrate phyla. This therefore appears to be a widespread strategy used by many animal phyla, including vertebrates.

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Crossref · 10.1016/j.jsb.2011.03.014

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  • Ca/P ratios of granules within undecalcified calcifying cartilage prepared under anhydrous conditions measured 0.8-1.1, and the same ratio measured in mineralizing murine bone granules in cryo conditions was 0.75 ± 0.22.

    “Ca/P ratios of granules within undecalcified calcifying cartilage prepared under anhydrous conditions measured 0.8–1.1 [123], and the same ratio measured in mineralizing murine bone granules in cryo conditions was 0.75 ± 0.22 [133].”
  • Cryo-EM and HPF-FS preparation have recently provided evidence of a secretory process for bone mineralization.

    “Cryo-EM and HPF-FS preparation have recently provided evidence of a secretory process for bone mineralization [131, 133, 154, 155].”
  • These nano-spheres were identified within preosteoblasts, osteoblasts, and osteocytes.

    “These nano-spheres were identified within preosteoblasts, osteoblasts, and osteocytes [133].”
  • Mahamid et al. imaged intracellular, membrane-bound, 80-nm-diameter Ca- and P-rich globules, which in turn are composed of smaller 10-nm spheres, in mineralizing embryonic and up to postnatal day 2 murine bones.

    “Mahamid et al. [133] imaged intracellular, membrane-bound, 80-nm-diameter Ca- and P-rich globules, which in turn are composed of smaller 10-nm spheres in mineralizing embryonic and up to postnatal day 2 murine bones.”

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Authors
Mahamid, J., Sharir, A., Gur, D., Zelzer, E., Addadi, L., & Weiner, S.
Affiliations
  • Weizmann Institute of Science (IL)
  • Hebrew University of Jerusalem (IL)
Corresponding author
Mahamid, Julia
Venue
Journal of Structural Biology
Publisher
Elsevier BV
Published
2011-06
Volume
174
Issue
3
Pages
527-535
ISSN
1047-8477 (ISSN-L)
OpenAlex
W2030345505
Cited by
272
References
46
Citations by year
2026: 8 · 2025: 21 · 2024: 11 · 2023: 19 · 2022: 9 · 2021: 23 · 2020: 19 · 2019: 26 · 2018: 25 · 2017: 15 · 2016: 27 · 2015: 20 · 2014: 20 · 2013: 14 · 2012: 12
FWCI
12.60
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Structural Biology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Kimmelman Center for Biomolecular Structure and Assembly, Weizmann Institute
Topics
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Alkaline Phosphatase Research Studies
  • Physical Sciences › Materials Science › Biomaterials › Calcium Carbonate Crystallization and Inhibition
  • Health Sciences › Medicine › Rheumatology › Bone and Dental Protein Studies
Keywords
bone mineralization, osteoblasts, intracellular vesicles, amorphous calcium phosphate, hydroxyapatite, bone matrix, long bones
MeSH terms
Animals, Bone and Bones, Calcification, Physiologic, Calcium Phosphates, Cytoplasmic Granules, Embryo, Mammalian, Fishes, Mice, Inbred C57BL, Skull, Tomography, X-Ray Computed, Durapatite, Cryoelectron Microscopy, Mice

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