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Bone Disorders01:29

Bone Disorders

4.4K
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.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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What is the Skeletal System?01:02

What is the Skeletal System?

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Overview
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The Functions of the Skeletal System01:22

The Functions of the Skeletal System

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The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
5.0K
Bone Remodeling01:40

Bone Remodeling

38.9K
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.
38.9K
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

3.4K
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...
3.4K
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

3.2K
The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
3.2K

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Related Experiment Video

Updated: Oct 25, 2025

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders
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Osteoblast Dysfunction in Non-Hereditary Sclerosing Bone Diseases.

Liberato Giardullo1, Alberto Altomare1, Cinzia Rotondo1

  • 1Rheumatology Clinic, Department of Medical and Surgical Sciences, University of Foggia, 71122 Foggia, Italy.

International Journal of Molecular Sciences
|August 7, 2021
PubMed
Summary

Osteoblast dysfunction in rare sclerosing bone diseases involves growth factors and signaling pathways. Further research is needed to fully understand these mechanisms and their clinical features.

Keywords:
bone metabolismbone sclerosismelorheostosisosteoblastsosteocondensation

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Area of Science:

  • Bone Biology
  • Pathophysiology
  • Sclerosing Bone Diseases

Background:

  • Osteoblast dysfunction is implicated in non-hereditary sclerosing bone diseases.
  • Osteoblast activity is regulated by growth factors (FGF, PDGF, TGF, BMP) and signaling pathways (Wnt, MAPK).
  • Existing research primarily focuses on osteoblastic metastases, with less understanding of rare sclerosing syndromes.

Purpose of the Study:

  • To review and summarize existing literature on osteoblast dysfunction in non-hereditary sclerosing bone diseases.
  • To correlate known osteoblast mechanisms with clinical features of these conditions.
  • To identify knowledge gaps regarding the pathophysiology of rare sclerosing bone diseases.

Main Methods:

  • Literature review of available evidence.
  • Synthesis of findings on osteoblast proliferation, migration, and activation.
  • Analysis of signaling pathways and molecular mechanisms involved.

Main Results:

  • Increased serum FGF and PDGF levels are observed in myelofibrosis.
  • Sphingosine-1-phosphate receptor expression is linked to osteoblastic hyperactivity in Paget's disease.
  • Post-zygotic MAPK changes are associated with sporadic Melorheostosis.
  • Osteomimicry and intercellular signaling alterations are noted in osteoblastic metastases.

Conclusions:

  • Specific growth factors and signaling pathways are implicated in osteoblast dysfunction in sclerosing bone diseases.
  • Understanding of osteoblast pathophysiology is more advanced for metastases than rare syndromes.
  • Further investigation is required to elucidate the pathological mechanisms in rare sclerosing non-hereditary diseases.