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Related Concept Videos

Essential Minerals for Bone Health01:31

Essential Minerals for Bone Health

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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.
Calcium and Phosphorus
Calcium is a critical component of bones, especially in the form of calcium phosphate and calcium carbonate. Since the body cannot make calcium, it must be obtained from the diet. However, calcium cannot be absorbed from the small intestine without...
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The Bone Matrix01:18

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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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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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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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Autophagy Modulates Cell Mineralization on Fluorapatite-Modified Scaffolds.

Y Li1, T Guo2, Z Zhang3

  • 1Department of Cariology, Restorative Sciences, and Endodontics, Dental School, University of Michigan, Ann Arbor, MI, USA State Key Laboratory of Military Stomatology, Department of Oral and Maxillofacial Surgery, School of Stomatology, Fourth Military Medical University, Xian, Shaanxi, China.

Journal of Dental Research
|March 11, 2016
PubMed
Summary
This summary is machine-generated.

Autophagy is crucial for mesenchymal stem cell differentiation on fluorapatite scaffolds. Inhibiting autophagy early significantly hinders osteogenic differentiation and mineralization, revealing its vital role in this process.

Keywords:
biomaterial(s)bone biologycell differentiationosteogenesisstem cell(s)tissue engineering

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Stem Cell Biology

Background:

  • Autophagy maintains cellular homeostasis and remodeling.
  • Fluorapatite (FA) crystal-coated polycaprolactone (PCL) scaffolds induce dental pulp stem cell differentiation and mineralization.
  • The role of autophagy in this process remains unclear.

Purpose of the Study:

  • To investigate the osteogenic inductive ability of FA crystals on adipose-derived stem cells (ASCs).
  • To observe and elucidate the changes in autophagy during ASC osteogenic differentiation.
  • To determine the role of autophagy in FA-induced ASC osteogenesis.

Main Methods:

  • ASCs were seeded on PCL+FA and PCL scaffolds.
  • Osteogenic differentiation was assessed using alkaline phosphatase activity, Alizarin red, and Von Kossa staining.
  • Autophagy was analyzed using RT2 Profiler PCR array and Western blot for LC3-II.
  • Autophagy inhibitors (3-MA, BAF A1, NH4Cl) were used to assess functional roles.

Main Results:

  • PCL+FA scaffolds supported ASC growth and mineralization, unlike PCL scaffolds alone.
  • Numerous autophagy-related genes and proteins, including LC3-II, showed dynamic changes during differentiation, peaking at day 7.
  • Inhibition of autophagy before day 3 significantly attenuated osteogenic marker expression and mineralization.

Conclusions:

  • Autophagy plays a critical role in the osteogenic differentiation of ASCs on PCL+FA scaffolds.
  • Early-stage autophagy inhibition (before day 3) severely impairs osteogenic differentiation and mineralization.
  • This study elucidates the mechanism of autophagy in mesenchymal stem cell osteogenic differentiation.