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Bone Cells and Tissue

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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.
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Related Experiment Video

Updated: May 10, 2026

Obtaining Primary Osteocytes Through Murine Calvarial Fractionation of GFP-Expressing Osteocytes

Obtaining Primary Osteocytes Through Murine Calvarial Fractionation of GFP-Expressing Osteocytes

Published on: June 2, 2020

Osteocytes are not only mechanoreceptive cells.

Gaël Y Rochefort¹, Claude-Laurent Benhamou

¹EA4708 I3MTO, University of Orleans, France.

International Journal for Numerical Methods in Biomedical Engineering

|June 19, 2013

Summary

Osteocytes, the most abundant bone cells, sense mechanical strain and regulate bone remodeling. Their death due to microcracks signals bone surface cells to initiate repair.

Keywords:

apoptosis bone remodeling mechanoreceptor microcracks osteocyte

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Analysis and Imaging of Osteocytes

Analysis and Imaging of Osteocytes

Published on: November 29, 2024

Area of Science:

Bone Biology
Cellular Mechanotransduction
Skeletal Physiology

Background:

Osteocytes constitute 95% of bone cells, residing within the mineralized matrix.
They possess a dendritic network (canalicular system) facilitating cell-cell and cell-matrix communication.
These cells are crucial mechanosensors, responding to mechanical stimuli like strain.

Purpose of the Study:

To elucidate the multifaceted roles of osteocytes in bone health.
To understand osteocyte mechanosensing and its downstream signaling pathways.
To explore the contribution of osteocyte apoptosis to bone remodeling.

Main Methods:

Review of existing literature on osteocyte biology and function.
Analysis of signaling cascades initiated by mechanical strain.
Examination of the impact of microdamage on osteocyte viability and bone remodeling.

Main Results:

Osteocytes detect mechanical strain, initiating intracellular signaling cascades involving nitric oxide and Wnt/β-catenin.
Mechanical signals are transmitted via the canalicular network to bone surface cells, influencing osteoblast and osteoclast activity.
Osteocyte apoptosis, triggered by microcracks, serves as a critical signal for initiating bone remodeling.
Osteocytes play an endocrine role in phosphate and vitamin D metabolism.

Conclusions:

Osteocytes are central regulators of bone remodeling through mechanosensing and signaling.
The integrity of the osteocyte canalicular network is vital for bone health and response to injury.
Osteocyte death is a key initiator of bone repair processes.