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Related Concept Videos

The Bone Matrix01:18

The Bone Matrix

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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Fibril-associated collagens are a type of collagens present in the extracellular matrix with interrupted triple helices or FACIT (Fibril-associated collagens interrupted triple-helices). FACIT help connect and attach the collagen fibrils with each other as well as with other proteins of the extracellular matrix.
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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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The minerals contained in all of the food we consume are essential for our organ systems. However, certain essential minerals, such as calcium, phosphorus, magnesium, manganese, and fluoride, largely affect bone health.
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Bone Remodeling01:40

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.
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Compact Bone01:27

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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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Related Experiment Video

Updated: Apr 3, 2026

Analysis of Minerals Produced by hFOB 1.19 and Saos-2 Cells Using Transmission Electron Microscopy with Energy Dispersive X-ray Microanalysis
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Analysis of Minerals Produced by hFOB 1.19 and Saos-2 Cells Using Transmission Electron Microscopy with Energy Dispersive X-ray Microanalysis

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Fibrillin microfibrils in bone physiology.

Silvia Smaldone1, Francesco Ramirez1

  • 1Department of Pharmacology and Systems Therapeutics, Institute for Systems Biomedicine, Icahn School of Medicine at Mount Sinai, New York, NY 10029, United States.

Matrix Biology : Journal of the International Society for Matrix Biology
|September 27, 2015
PubMed
Summary

Fibrillin proteins are crucial for bone development and function, impacting skeletal abnormalities in Marfan syndrome and congenital contractural arachnodactyly. Their roles in signaling pathways are key to understanding bone degeneration.

Keywords:
Autopod patterningBone marrow nicheFibrillinMarfan syndromeMesenchymal stem cellsOsteopeniaTGFβ and BMP signaling

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Area of Science:

  • Skeletal Biology
  • Connective Tissue Biology
  • Developmental Biology

Background:

  • Fibrillin assemblies (microfibrils and elastic fibers) are vital for bone formation and function, despite low abundance in skeletal matrices.
  • Severe skeletal abnormalities in Marfan syndrome (MFS) and congenital contractural arachnodactyly (CCA) highlight the importance of fibrillins.

Purpose of the Study:

  • To investigate the distinct roles of fibrillin-1 and fibrillin-2 in bone development and metabolism.
  • To elucidate the pathophysiological mechanisms linking fibrillin mutations to skeletal phenotypes.
  • To understand the contribution of fibrillin scaffolds to TGFβ and BMP signaling in bone.

Main Methods:

  • Utilizing mouse models of MFS and CCA to study skeletal phenotypes.
  • Analyzing the distinct contributions of fibrillin-1 and fibrillin-2 to signaling pathways.
  • Examining the impact on marrow mesenchymal stem cell commitment and differentiation.

Main Results:

  • Fibrillin-2 uniquely regulates BMP-dependent limb patterning.
  • Fibrillin-1 and fibrillin-2 have distinct effects on mesenchymal stem cell fate.
  • Mutant mice exhibit skeletal phenotypes linked to specific pathophysiological mechanisms.

Conclusions:

  • Fibrillin scaffolds critically influence bone patterning, growth, and metabolism via TGFβ and BMP signaling.
  • Understanding fibrillin function is essential for addressing age- and injury-related bone degeneration.