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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...

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...

Osteoclasts in Bone Remodeling

Osteoclasts in Bone Remodeling

Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...

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...

The Extracellular Matrix

The Extracellular Matrix

Overview
In order to maintain tissue organization, many animal cells are surrounded by structural molecules that make up the extracellular matrix (ECM). Together, the molecules in the ECM maintain the structural integrity of tissue as well as the remarkable specific properties of certain tissues.
Composition of the Extracellular Matrix
The extracellular matrix (ECM) is commonly composed of ground substance, a gel-like fluid, fibrous components, and many structurally and functionally diverse...

The Extracellular Matrix

The Extracellular Matrix

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Related Experiment Video

Updated: May 6, 2026

A Fluorescent Intravital Imaging Approach to Study Load-Induced Calcium Signaling Dynamics in Mouse Osteocytes

A Fluorescent Intravital Imaging Approach to Study Load-Induced Calcium Signaling Dynamics in Mouse Osteocytes

Published on: February 24, 2023

[Stress and cell communication between bone cells].

Tomoki Nakashima¹

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

Clinical Calcium

|October 29, 2013

Summary

This summary is machine-generated.

Bone remodeling, essential for bone strength and mineral balance, involves coordinated actions of osteoclasts and osteoblasts. Osteocytes may play a key role in regulating this process and sensing mechanical stress.

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Last Updated: May 6, 2026

A Fluorescent Intravital Imaging Approach to Study Load-Induced Calcium Signaling Dynamics in Mouse Osteocytes

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Analysis and Imaging of Osteocytes

Analysis and Imaging of Osteocytes

Published on: November 29, 2024

Area of Science:

Skeletal Biology
Cellular Physiology

Context:

Bone remodeling is a continuous process vital for skeletal integrity and mineral homeostasis.
This process involves the coordinated activity of bone-forming osteoblasts and bone-resorbing osteoclasts.

Purpose:

To elucidate the regulatory mechanisms of bone remodeling.
To investigate the potential role of osteocytes in bone remodeling and mechanical stress sensing.

Summary:

Bone renewal relies on balanced bone formation and resorption, primarily at the bone surface.
Osteoclast-mediated resorption precedes osteoblast-mediated formation during remodeling.
Osteocytes, embedded within the bone matrix, are proposed to regulate remodeling and sense mechanical stimuli.

Impact:

Understanding bone remodeling is crucial for addressing bone diseases linked to its imbalance.
Identifying osteocyte functions could reveal new therapeutic targets for skeletal disorders.
This research enhances knowledge of skeletal cell communication and mechanotransduction.