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Related Concept Videos

Bone Remodeling01:40

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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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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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Matrix metalloproteases (MMPs) are enzymes involved in the hydrolysis of proteins and glycoproteins of the extracellular matrix. MMPs are essential for the migration and proliferation of cells through the dense matrix network, throughout embryonic development, and throughout morphogenesis. The first MMP activity discovered was a collagenase in a tadpole's tail undergoing metamorphosis. The active collagen deposition and modifications lead to the morphogenesis of tadpoles into the adult...
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Related Experiment Video

Updated: Dec 26, 2025

Direct and Indirect Culture Methods for Studying Biodegradable Implant Materials In Vitro
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[Progress on cell-mediated degradation of bone materials].

Xin Jiao1, Dongliang Wang2, Yaokai Gan1

  • 1Shanghai Key Laboratory of Orthopaedic Implants, Department of Orthopaedic Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology
|March 10, 2020
PubMed
Summary

Understanding cell-mediated degradation of biomaterials is crucial for effective bone repair. This process, involving cells like macrophages and osteoclasts, guides the design of better bone graft materials for enhanced regeneration.

Keywords:
biomaterialbone repaircell-mediated pathwaydegradationmacrophage

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Area of Science:

  • Biomaterials Science
  • Cell Biology
  • Tissue Engineering

Background:

  • Biomaterials are essential for bone tissue repair, requiring careful consideration of biocompatibility, mechanical properties, and degradability.
  • Material degradation can occur through physical, chemical, or biological mechanisms.
  • Cell-mediated degradation is a key biological pathway involving macrophages, osteoclasts, and their secreted factors.

Purpose of the Study:

  • To elucidate the mechanisms of cell-mediated degradation of biomaterials used in bone repair.
  • To enhance the understanding of cellular behaviors involved in biomaterial biodegradation.
  • To inform the design of advanced bone graft materials.

Main Methods:

  • Review of existing literature on biomaterial degradation pathways.
  • Analysis of the roles of macrophages and osteoclasts in biomaterial breakdown.
  • Examination of cellular secretions such as reactive oxygen species, enzymes, and acidic metabolites.

Main Results:

  • Cell-mediated degradation is primarily driven by the biological activity of macrophages and osteoclasts.
  • Secreted factors including reactive oxygen species, enzymes, and acidic metabolites contribute significantly to biodegradation.
  • Understanding these cellular interactions is key to optimizing biomaterial performance.

Conclusions:

  • Illustrating cell-mediated degradation improves comprehension of cellular roles in bone repair.
  • This knowledge facilitates the design of more effective bone repair materials.
  • Optimized materials ensure initial stability, synchronized degradation with new bone formation, and promote overall bone regeneration.