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The Bone Matrix

The Bone Matrix

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 acid or...

Essential Minerals for Bone Health

Essential Minerals for Bone Health

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...

Role of Vitamins in Maintaining Bone Health

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...

Skeleton and Calcium Homeostasis

Skeleton and Calcium Homeostasis

Calcium is not only the most abundant mineral in bone but also the most abundant mineral in the human body. Calcium ions are needed for bone mineralization, tooth health, heart rate regulation and strength of contraction, blood coagulation, the contraction of smooth and skeletal muscle cells, and the regulation of nerve impulse conduction. The average calcium level in the blood is about 10 mg/dL. When the body cannot maintain this level, a person will experience hypo or hypercalcemia.

Roles of Electrolytes: Calcium and Phosphate

Roles of Electrolytes: Calcium and Phosphate

Calcium and phosphate are essential electrolytes in the human body, with calcium being the most abundant mineral. Around 99% of the body's calcium is stored in the skeleton and teeth, forming a crystal lattice of mineral salts in combination with phosphates. Calcium plays crucial roles in various bodily functions such as blood clotting, neurotransmitter release, muscle tone maintenance, and nervous and muscle tissue excitability.
The calcium concentration in blood plasma is primarily regulated...

Hormones and Bone Tissue

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...

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Related Experiment Video

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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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Acidic bone matrix proteins and their roles in calcification.

Ryuichi Fujisawa¹, Masato Tamura

¹Department of Oral Biochemistry and Molecular Biology, School of Dentistry, Hokkaido University, N13W7, Sapporo, Japan 080-8586. rfuji@den.hokudai.ac.jp

Frontiers in Bioscience (Landmark Edition)

|December 29, 2011

Summary

Mammalian bone mineralization relies on acidic matrix proteins like bone sialoprotein, which aid hydroxyapatite crystal formation and shape. These proteins are crucial for bone

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Area of Science:

Biomineralization
Bone Biology
Materials Science

Background:

Mammalian bone comprises hydroxyapatite crystals within a protein matrix, primarily type I collagen.
Collagen is vital for bone's mechanical strength and calcification.
Minor acidic proteins also play roles in bone mineralization and crystal formation.

Purpose of the Study:

To investigate the role of acidic matrix proteins in bone mineralization.
To understand how these proteins influence hydroxyapatite crystal nucleation and growth.
To explore the function of specific proteins like bone sialoprotein (BSP) and dentin phosphoprotein.

Main Methods:

Analysis of bone and dentin matrix composition.
Identification and characterization of acidic matrix proteins.
Investigation of protein-crystal interactions using biophysical techniques (implied).

Main Results:

Acidic matrix proteins, including BSP and dentin phosphoprotein, are involved in hydroxyapatite nucleation.
These proteins can modulate crystal shape by adsorbing onto specific crystal faces.
Some acidic proteins are immobilized on collagen fibrils, initiating hydroxyapatite crystal formation.

Conclusions:

Acidic matrix proteins are key regulators of bone mineralization.
These proteins influence the structural properties of bone by controlling crystal formation.
Understanding these proteins offers insights into bone health and disease.