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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...

Bone Cells and Tissue

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the...

Bone as Supporting Connective Tissue

Bone as Supporting Connective Tissue

Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
Bone Matrix
Bone, or osseous tissue, is a connective tissue that has a large amount of two different types of matrix material. The organic matrix is similar to the matrix material found in other connective tissues, including some amount of collagen and elastic fibers. This gives strength and flexibility to the tissue. The inorganic matrix consists of mineral salts— mostly calcium salts—...

Bone Remodeling

Bone Remodeling

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.

Spongy Bone

Spongy Bone

All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
Spongy bone is more porous, and less dense compared to compact bone. It is composed of concentric lamellae that are arranged irregularly to form the trabecular network. In some bones, the spaces between trabeculae contain red marrow, where...

Compact Bone

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

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Related Experiment Video

Updated: Apr 29, 2026

A Lab-On-A-Chip Platform for Stimulating Osteocyte Mechanotransduction and Analyzing Functional Outcomes of Bone Remodeling

A Lab-On-A-Chip Platform for Stimulating Osteocyte Mechanotransduction and Analyzing Functional Outcomes of Bone Remodeling

Published on: May 21, 2020

[Coupling and communication between bone cells].

Tomoki Nakashima¹

¹Department of Cell Signaling, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Japan.

Clinical Calcium

|May 30, 2014

Summary

This summary is machine-generated.

Bone remodeling relies on balanced osteoblast and osteoclast activity. Understanding cell communication and coupling factors is crucial for skeletal health and treating bone diseases.

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Area of Science:

Skeletal Biology
Bone Physiology
Cellular Signaling

Background:

Bone remodeling involves coupled osteoblastic bone formation and osteoclastic bone resorption.
This process is vital for maintaining bone mass, strength, and mineral homeostasis.
Imbalances in bone remodeling are associated with various skeletal diseases.

Purpose of the Study:

To investigate the regulatory mechanisms of bone cell communication and coupling.
To understand the role of signaling factors in coordinating bone formation and resorption.

Main Methods:

Analysis of molecular signaling pathways between osteoblasts and osteoclasts.
Investigating the function of osteoclast-derived factors (clastokines).

Main Results:

Transforming growth factor-beta (TGF-β) and insulin-like growth factor (IGF) are identified as classical coupling factors.
Emerging evidence suggests osteoclast-derived cytokines mediate directional cell signaling.
Elucidation of novel clastokines involved in bone microenvironment communication.

Conclusions:

Understanding bone cell communication is critical for skeletal health.
Identifying novel coupling factors can lead to new therapeutic strategies for bone diseases.
Further research into clastokine function will deepen our knowledge of skeletal homeostasis.