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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
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All bones comprise an outer layer of compact bone, and an interior made up of spongy bone tissue, also called cancellous or trabecular bone. In long bones, spongy bone tissue is mainly found in the interior of the epiphyses (broad ends of the bone).
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Complement involvement in bone homeostasis and bone disorders.

Yvonne Mödinger1, Bettina Löffler2, Markus Huber-Lang3

  • 1Institute of Orthopaedic Research and Biomechanics, Center for Trauma Research Ulm (ZTF Ulm), University Medical Center Ulm, Ulm, Germany.

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Summary
This summary is machine-generated.

The complement system is crucial for bone health, influencing everything from development and healing to inflammatory diseases like arthritis and periodontitis. Modulating this system offers therapeutic potential for skeletal health.

Keywords:
ArthritisBoneComplement systemFracture healingInflammationOsteomyelitis

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Area of Science:

  • Immunology
  • Skeletal Biology
  • Regenerative Medicine

Background:

  • The complement system, a key part of innate immunity, has recently revealed broader roles beyond pathogen defense, including tissue homeostasis and skeletal system regulation.
  • Its involvement in bone was first noted in inflammatory conditions like rheumatoid arthritis, osteoarthritis, and periodontitis, where elevated complement proteins are observed.
  • The complement system also critically influences bone regeneration and healing, particularly following fractures and in inflammatory contexts.

Purpose of the Study:

  • To review the multifaceted role of the complement cascade in bone biology.
  • To explore its functions in both physiological (homeostasis, development) and pathological (inflammation, infection) states affecting skeletal health.
  • To discuss the therapeutic potential of modulating the complement system for bone-related conditions.

Main Methods:

  • Literature review of existing experimental and clinical data.
  • Synthesis of findings on complement's role in bone fractures, arthritides, periodontitis, and osteomyelitis.
  • Analysis of complement's impact on bone cell development, metabolism, and communication.

Main Results:

  • Complement proteins are present in growth-plate cartilage, indicating a role in physiological bone growth and homeostasis.
  • Complement activation significantly impacts bone cell differentiation, metabolism, and intercellular communication (osteoblasts/osteoclasts).
  • The complement system plays a critical role in sterile and non-sterile inflammatory bone conditions and fracture healing.

Conclusions:

  • The complement cascade is integral to bone health, affecting development, homeostasis, and responses to injury and infection.
  • Understanding complement's complex roles provides a basis for developing novel therapeutic strategies targeting skeletal diseases.
  • Modulating the complement system holds promise for reducing bone infections, balancing bone turnover, and improving overall skeletal health.