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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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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Bone marrow transplant is a potential cure for several diseases, including cancer and specific genetic disorders. Notably, this procedure is applicable for patients suffering from aplastic anemia, certain types of leukemia, severe combined immunodeficiency disease (SCID), Hodgkin's disease, non-Hodgkin's lymphoma, multiple myeloma, thalassemia, sickle-cell disease, and certain cancers.
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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Osteoclast Derivation from Mouse Bone Marrow
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Crosstalk between bone and the immune system.

Kazuo Okamoto1,2

  • 1Department of Osteoimmunology, Graduate School of Medicine and Faculty of Medicine, The University of Tokyo, Tokyo, Japan. okamotok@staff.kanazawa-u.ac.jp.

Journal of Bone and Mineral Metabolism
|July 26, 2024
PubMed
Summary
This summary is machine-generated.

Osteoimmunology reveals how bone and immune system interactions maintain health and cause diseases like rheumatoid arthritis. Understanding this crosstalk offers new therapeutic strategies for immune and skeletal disorders.

Keywords:
BoneBone marrow microenvironmentImmune systemOsteoclastOsteoimmunologyRANKL

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Area of Science:

  • Osteoimmunology
  • Skeletal Biology
  • Immunology

Background:

  • Bone is a critical musculoskeletal component and a primary lymphoid organ for hematopoietic stem cells (HSCs) and immune progenitors.
  • Osteoimmunology studies the dynamic interplay between skeletal and immune systems, crucial for tissue homeostasis and disease pathogenesis.
  • Aberrant immune activity impacts bone remodeling, contributing to skeletal disorders like rheumatoid arthritis.

Purpose of the Study:

  • To explore the complex crosstalk between the immune and skeletal systems.
  • To understand the role of this interaction in maintaining bone marrow microenvironment and HSC maintenance.
  • To investigate how dysregulation of immune-bone crosstalk contributes to diseases.

Main Methods:

  • Review of current literature in osteoimmunology.
  • Analysis of the role of immune cells and bone cells in homeostasis and disease.
  • Examination of the bone marrow microenvironment's influence on HSCs and immune progenitors.

Main Results:

  • Immune activation directly affects osteoclasts and osteoblasts, disrupting bone remodeling.
  • The bone marrow microenvironment is essential for HSC maintenance and differentiation.
  • Dysregulated immune-bone crosstalk can lead to tumorigenesis and inflammation.

Conclusions:

  • Deciphering immune-bone crosstalk deepens understanding of immune and skeletal disease pathogenesis.
  • This knowledge may offer novel therapeutic targets for related disorders.
  • Maintaining skeletal and immune homeostasis through understanding their crosstalk is vital.