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Related Concept Videos

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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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.
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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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A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
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Cytokines and Bone: Osteoimmunology.

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Cytokines and hematopoietic growth factors regulate immune cells but also significantly impact bone health and skeleton development. Understanding these roles is crucial for addressing bone diseases like osteoporosis.

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Area of Science:

  • Immunology
  • Bone Biology
  • Endocrinology

Background:

  • Cytokines and hematopoietic growth factors traditionally regulate immune and blood cell development.
  • Emerging evidence shows these factors profoundly influence bone cell activity and skeletal development.
  • Cytokines are implicated in the pathogenesis of osteoporosis in both animal models and humans.

Purpose of the Study:

  • To provide a comprehensive overview of the diverse effects of cytokines and inflammation on bone cells.
  • To elucidate the mechanisms by which these factors regulate osteoblasts, osteoclasts, and bone mass.
  • To highlight the dysregulation of these mechanisms in bone diseases.

Main Methods:

  • Literature review and synthesis of existing research on cytokines, inflammation, and bone biology.
  • Analysis of studies linking specific cytokines to bone cell function and skeletal homeostasis.
  • Examination of data from animal models and human patients with osteoporosis.

Main Results:

  • Cytokines and growth factors exert significant effects on osteoblasts and osteoclasts, influencing bone formation and resorption.
  • Inflammation plays a critical role in modulating bone mass and is a key factor in osteoporosis development.
  • Specific cytokines have been identified as critical mediators in the pathogenesis of bone loss.

Conclusions:

  • Cytokines and inflammatory processes are integral to skeletal homeostasis and disease.
  • A thorough understanding of cytokine-bone interactions is essential for developing therapeutic strategies for osteoporosis.
  • This chapter serves as a foundational resource for further investigation into cytokine-mediated skeletal regulation.