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Bone Remodeling and Repair01:31

Bone Remodeling and Repair

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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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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Healing I: Introduction01:11

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Healing is the physiological process by which the body restores the integrity and function of damaged tissues following injury. It involves a coordinated interplay of cellular proliferation, extracellular matrix remodeling, and growth factor signaling. The extent and nature of the tissue damage determine whether healing occurs by resolution, regeneration, or replacement.ResolutionResolution represents the most complete form of healing, occurring when the injury is minimal and tissue...
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Peptides from Phage Display Library Modulate Gene Expression in Mesenchymal Cells and Potentiate Osteogenesis in Unicortical Bone Defects
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Osteogenic peptides in bone regeneration.

Esmaiel Jabbari1

  • 1Department of Chemical Engineering, Swearingen Engineering Center, University of South Carolina, Columbia, SC 29208, USA. jabbari@engr.sc.edu

Current Pharmaceutical Design
|February 26, 2013
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Osteogenic peptides from bone extracellular matrix offer a promising alternative to growth factors for bone regeneration. Immobilizing these peptides enhances their efficacy in promoting bone formation and implant integration.

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Published on: September 7, 2017

Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Research

Background:

  • Osteogenic proteins used in regenerative medicine have short half-lives and diffuse from regeneration sites, necessitating high doses and causing side effects.
  • Bone extracellular matrix (ECM) components yield peptides that can initiate osteogenesis, vasculogenesis, mineralization, and bone formation.
  • Various osteogenic peptides have been identified, including those derived from bone morphogenetic proteins, collagen, and other ECM proteins.

Purpose of the Study:

  • To discuss the anabolic effects of osteogenic peptides, focusing on cell adhesion, differentiation, and mineralization.
  • To highlight the enhanced biological activity of immobilized osteogenic peptides compared to free peptides.
  • To explore the potential of osteogenic peptides in orthopedic applications, particularly in improving implant integration.

Main Methods:

  • Review of existing literature on osteogenic peptides derived from bone ECM components.
  • Discussion of in vitro and in vivo studies demonstrating the efficacy of immobilized peptides.
  • Analysis of synergistic effects of combined osteogenic and integrin-binding peptides.
  • Evaluation of functionalization of orthopedic implants with osteogenic peptides.

Main Results:

  • Osteogenic peptides, especially when immobilized, exhibit significantly higher biological activity in vitro and in vivo.
  • Immobilization via conjugation or grafting likely prevents peptide mobility and diffusion, enhancing local activity.
  • Combinations of osteogenic and integrin-binding peptides show synergistic enhancement of cell adhesion and mineralization.
  • Functionalizing orthopedic implants with these peptides improves tissue integration and reduces implant failure.

Conclusions:

  • Osteogenic peptides are a viable alternative to traditional growth factors in orthopedic applications.
  • Immobilization strategies are crucial for maximizing the therapeutic potential of osteogenic peptides.
  • Further in vivo studies in primates and humans are necessary to validate their clinical efficacy.