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Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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 bone...
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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
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A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
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Involvement of alpha(v)beta3 integrins in osteoclast function.

Ichiro Nakamura1, Le T Duong, Sevgi B Rodan

  • 1Department of Rheumatology, Yugawara Kosei-nenkin Hospital, 438 Miyakami, Yugawara, Ashigara-shimo, Kanagawa 259-0314, Japan. Ichiclast@yugawara-hosp.com

Journal of Bone and Mineral Metabolism
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PubMed
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Alpha-v-beta-3 integrin (αvβ3) is crucial for osteoclast function and bone resorption. Targeting this integrin offers potential new treatments for bone diseases like osteoporosis and rheumatoid arthritis.

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Area of Science:

  • Cell Biology
  • Integrin Signaling
  • Bone Biology

Background:

  • Integrins are cell surface receptors mediating cell-matrix interactions.
  • Osteoclasts highly express alpha-v-beta-3 integrin (αvβ3), binding extracellular matrix proteins.
  • αvβ3 integrin plays a role in regulating osteoclast function.

Purpose of the Study:

  • To review the role of αvβ3 integrin in osteoclast biology.
  • To discuss the involvement of αvβ3 integrins in osteoclast function at multiple levels.
  • To highlight the therapeutic potential of targeting αvβ3 integrin in bone diseases.

Main Methods:

  • Review of existing literature on αvβ3 integrin and osteoclasts.
  • Analysis of signaling pathways involving αvβ3 integrin.
  • Discussion of in vitro and in vivo studies on bone resorption inhibition.

Main Results:

  • αvβ3 integrin binds to matrix proteins like vitronectin and osteopontin.
  • Inhibition of αvβ3 integrin with peptides or antibodies reduces bone resorption.
  • Signaling molecules such as c-Src and Pyk2 are involved in αvβ3 integrin pathways.

Conclusions:

  • αvβ3 integrin is a key regulator of osteoclast function and bone resorption.
  • Understanding αvβ3 integrin signaling provides therapeutic targets for bone diseases.
  • Targeting αvβ3 integrin may lead to new treatments for osteoporosis, rheumatoid arthritis, and periodontal disease.