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Bone Cells and Tissue01:30

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 periosteum and...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Osteoclasts in Bone Remodeling01:31

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 bone...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

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Related Experiment Video

Updated: May 8, 2026

Tracking Mouse Bone Marrow Monocytes In Vivo
12:08

Tracking Mouse Bone Marrow Monocytes In Vivo

Published on: February 27, 2015

Immune cells and bone: coupling goes both ways.

Nicole J Horwood1

  • 1Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford, United Kingdom. nicole.horwood@kennedy.ox.ac.uk

Immunological Investigations
|September 6, 2013
PubMed
Summary
This summary is machine-generated.

The immune system and bone cells constantly interact, influencing each other's function. This review highlights how immune cells impact bone formation and resorption, crucial for understanding skeletal health.

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Area of Science:

  • Immunology
  • Bone Biology
  • Stem Cell Research

Background:

  • Growing evidence shows immune cells regulate bone cell activity.
  • Bone cells are essential for immune cell development and maintenance.
  • Osteoblasts and osteoclasts play key roles in the hematopoietic stem cell niche.

Purpose of the Study:

  • To review recent advancements in the interplay between immune and bone cells.
  • To discuss the significance of immune cell contributions to bone remodeling.
  • To explore the coupling of bone formation and resorption in this context.

Main Methods:

  • Literature review of recent scientific publications.
  • Synthesis of findings on immune cell-bone cell interactions.
  • Analysis of in vitro and in vivo studies.

Main Results:

  • Mature immune cells influence bone formation both in vitro and in vivo.
  • Immune system cells direct bone cell function.
  • Bone cells are involved in generating and retaining immune cells.

Conclusions:

  • The bidirectional communication between immune and bone cells is critical.
  • Understanding immune system's role in bone remodeling is essential for skeletal health.
  • Coupling of bone formation and resorption is significantly influenced by immune cells.