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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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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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Bone tissue forms the internal skeleton of vertebrate animals, providing structure to the body.
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Osteocytes: The master cells in bone remodelling.

Matthew Prideaux1, David M Findlay1, Gerald J Atkins1

  • 1Centre for Orthopaedic and Trauma Research, University of Adelaide, North Terrace, Adelaide, SA 5005, Australia.

Current Opinion in Pharmacology
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Summary
This summary is machine-generated.

Bone remodeling relies on osteoclasts and osteoblasts maintaining a balance. Osteocytes are key cells regulating this bone homeostasis through signaling pathways, offering therapeutic potential.

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Area of Science:

  • Bone Biology
  • Skeletal Physiology
  • Cellular Signaling

Background:

  • Bone remodeling is a continuous process involving bone resorption by osteoclasts and bone formation by osteoblasts.
  • Maintaining a strict balance between these activities is crucial for skeletal integrity and bone homeostasis.
  • Osteocytes, embedded within the bone matrix, are emerging as critical regulators of this balance.

Purpose of the Study:

  • To elucidate the key signaling pathways through which osteocytes control bone remodeling.
  • To explore the role of osteocytes in maintaining bone homeostasis.
  • To identify potential therapeutic targets within osteocyte signaling pathways for bone diseases.

Main Methods:

  • Review of current literature on osteocyte biology and signaling.
  • Analysis of established and novel signaling pathways involved in osteoclast and osteoblast regulation.
  • Investigation of osteocyte-mediated control mechanisms in bone homeostasis.

Main Results:

  • Osteocytes act as mechanosensors and orchestrate bone remodeling.
  • Key signaling pathways, including those involving sclerostin and FGF23, are central to osteocyte function.
  • Osteocytes directly influence osteoclast and osteoblast activity to maintain bone mass.

Conclusions:

  • Osteocytes play a pivotal role in regulating bone remodeling and maintaining skeletal homeostasis.
  • Understanding osteocyte signaling pathways is essential for developing new therapeutic strategies for bone disorders.
  • Targeting osteocyte-derived signals offers promising avenues for treating conditions like osteoporosis.