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Related Concept Videos

Bone Cells and Tissue01:30

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.
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...
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Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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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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Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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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...
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Bone Remodeling01:40

Bone Remodeling

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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.
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Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

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Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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Bone Formation by Endochondral Ossification01:24

Bone Formation by Endochondral Ossification

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Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...
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Related Experiment Video

Updated: Apr 29, 2026

Real-Time Imaging of CCL5-Induced Migration of Periosteal Skeletal Stem Cells in Mice
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[Cytokines and osteogenesis].

Makoto Fujiwara1, Keiichi Ozono

  • 1Department of Pediatrics, Osaka University Graduate School of Medicine, Japan.

Clinical Calcium
|May 30, 2014
PubMed
Summary

Cytokines regulate osteoblast activity crucial for bone formation. Understanding complex signaling pathways, like TGF-β and WNT, is key to treating bone disorders.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Context:

  • Osteoblasts are critical for bone formation (osteogenesis).
  • Numerous signaling pathways, including TGF-β, BMP, IGF, FGF, Hedgehog, Notch, IL, and WNT, influence osteoblast function.
  • Mutations in genes regulating these pathways are linked to bone disorders.

Purpose:

  • To elucidate the complex regulatory mechanisms of cytokine signaling in osteogenesis.
  • To explore potential crosstalk and common pathways among different cytokine signaling cascades.
  • To bridge the understanding of cytokine regulation with clinical applications for bone diseases.

Summary:

  • Cytokines significantly impact osteoblast proliferation, differentiation, and activation, processes vital for osteogenesis.

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  • While various signaling pathways (e.g., TGF-β, WNT) and their inhibitors are known to affect osteogenesis, their intricate interactions remain unclear.
  • Research suggests interconnectedness and crosstalk between these cytokine pathways, highlighting a complex regulatory network.

    • Impact:

    • Advances in understanding cytokine signaling in osteogenesis can lead to novel therapeutic strategies for bone diseases.
    • Identifying common pathways may offer broader targets for treating diverse bone disorders.
    • This knowledge is expected to translate into improved clinical therapies for skeletal conditions.