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Biological Compatibility Profile on Biomaterials for Bone Regeneration
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Bone and the Immune System.

M Neale Weitzmann1,2

  • 11 Department of Veterans Affairs, Atlanta VA Medical Center, Decatur, Georgia, USA.

Toxicologic Pathology
|October 20, 2017
PubMed
Summary
This summary is machine-generated.

The immune system significantly impacts bone health through the immunoskeletal interface (ISI). Immune cells like T and B cells can both preserve and degrade bone, influencing osteoporosis and fracture risk.

Keywords:
B cellRANKLT cellboneimmunoskeletal interfaceosteoimmunologyosteoprotegerin

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Area of Science:

  • Immunology
  • Orthopedics
  • Endocrinology

Background:

  • Osteoporosis is a major cause of fractures, morbidity, and mortality.
  • The immunoskeletal interface (ISI) highlights the interplay between immune and skeletal systems in bone turnover.
  • Immune cells, particularly T and B cells, secrete cytokines that profoundly influence bone metabolism.

Purpose of the Study:

  • To explore the role of the immunoskeletal interface (ISI) in osteoporosis pathogenesis.
  • To elucidate how immune cell-derived factors contribute to bone loss in various conditions.
  • To identify novel therapeutic targets for reducing fracture risk by modulating the ISI.

Main Methods:

  • Review and synthesis of existing literature on the immunoskeletal interface and bone metabolism.
  • Analysis of cytokine profiles and cellular interactions in conditions like HIV/AIDS, postmenopausal osteoporosis, and hyperparathyroidism.
  • Examination of the effects of immune-modulating therapies on bone turnover.

Main Results:

  • Physiologically, B cells produce osteoprotegerin (OPG) to maintain bone mass.
  • Pathologically, activated T and B cells release RANKL, IL-17A, and TNF-α, promoting bone resorption and osteoporosis.
  • Immune reconstitution in HIV/AIDS and estrogen deficiency exacerbate bone loss via these pro-osteoclastogenic factors.
  • T cells also produce Wnt10b, an anabolic factor promoting bone formation.

Conclusions:

  • The immunoskeletal interface is a critical regulator of bone turnover, with immune dysregulation driving osteoporosis.
  • Factors like RANKL, IL-17A, and TNF-α secreted by immune cells are key mediators of bone loss.
  • Targeting the ISI offers promising therapeutic strategies for managing osteoporosis and reducing fracture risk.