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Osteoclasts in Bone Remodeling01:31

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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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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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Differentiation of Functional Osteoclasts from Human Peripheral Blood CD14+ Monocytes
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[Inflammation and osteoclasts].

Kazuhiro Yokota1

  • 1Department of Rheumatology and Applied Immunology, Faculty of Medicine, Saitama Medical University.

Nihon Rinsho Men'Eki Gakkai Kaishi = Japanese Journal of Clinical Immunology
|December 15, 2017
PubMed
Summary
This summary is machine-generated.

Chronic inflammation can trigger osteoclast differentiation independently of RANKL signaling, leading to excessive bone resorption. Understanding this cytokine-mediated pathway may reveal new treatments for inflammatory joint diseases.

Keywords:
RANKL-independent osteclast diffferentiationinflammationosteoclastsrheumatoid arthritis

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Area of Science:

  • Immunology
  • Cell Biology
  • Rheumatology

Background:

  • Osteoclasts, the sole bone-resorbing cells, typically differentiate from monocyte/macrophage precursors requiring M-CSF and RANKL signaling.
  • Chronic inflammatory conditions, like rheumatoid arthritis, elevate joint cytokine levels, potentially inducing pathological osteoclast differentiation and excessive bone resorption.

Purpose of the Study:

  • To discuss the mechanism of RANKL-independent osteoclast differentiation.
  • To explore the role of cytokines, such as TNFα and IL-6, in pathological osteoclastogenesis.
  • To highlight potential therapeutic targets for inflammatory joint diseases.

Main Methods:

  • Review of existing data on osteoclast differentiation.
  • Analysis of studies involving stimulation of mouse and human monocytes with TNFα and IL-6.
  • Discussion of recent findings on cytokine-mediated osteoclastogenesis.

Main Results:

  • TNFα and IL-6 can induce differentiation of osteoclast-like cells from monocytes.
  • This cytokine-mediated differentiation pathway is independent of RANKL signaling.
  • Pathological osteoclast differentiation contributes to excessive bone resorption in inflammatory diseases.

Conclusions:

  • RANKL-independent, cytokine-mediated osteoclast differentiation is a key mechanism in inflammatory joint diseases.
  • Understanding these pathways can lead to novel therapeutic strategies for conditions like rheumatoid arthritis.
  • Targeting cytokine signaling may offer a new approach to control pathological bone resorption.