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Related Concept Videos

Hormones and Bone Tissue01:17

Hormones and Bone Tissue

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...
Bone Remodeling01:40

Bone Remodeling

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.
Osteoclasts in Bone Remodeling01:31

Osteoclasts in Bone Remodeling

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...
Regulation of Hematopoietic Stem Cells01:01

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All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
Bone Disorders01:29

Bone Disorders

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Related Experiment Video

Updated: Jul 10, 2026

Osteoclast Derivation from Mouse Bone Marrow
06:17

Osteoclast Derivation from Mouse Bone Marrow

Published on: November 6, 2014

Immunologic regulation of bone development.

Mark C Horowitz1, Joseph A Lorenzo

  • 1Yale University School of Medicine, Department of Orthopaedics and Rehabilitation, New Haven, CT, USA. mark.horowitz@yale.edu

Advances in Experimental Medicine and Biology
|October 31, 2007
PubMed
Summary

Transcription factors Early B Cell Factor-1 (EBF-1) and Pax5, crucial for B cell development, also significantly impact bone cell regulation. Loss of Pax5 leads to osteopenia and increased osteoclasts, while EBF-1 deficiency causes altered osteoblast and adipocyte populations, affecting bone formation and marrow composition.

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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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11:47

A Novel in vivo Gene Transfer Technique and in vitro Cell Based Assays for the Study of Bone Loss in Musculoskeletal Disorders

Published on: June 8, 2014

Area of Science:

  • * Hematology
  • * Bone Biology
  • * Molecular Biology

Background:

  • * Transcription factors PU.1, Ikaros, E2A, EBF, and Pax5 regulate B cell fate.
  • * Early B Cell Factor-1 (EBF-1) is vital for B cell specification.
  • * Pax5 is essential for B cell development, with deficiencies causing pro-B cell arrest.

Purpose of the Study:

  • * To investigate the role of transcription factors Pax5 and EBF-1 in bone cell development.
  • * To analyze the bone phenotype in mice lacking functional Pax5 or EBF-1.
  • * To understand the non-B cell effects of key B cell regulatory transcription factors.

Main Methods:

  • * Phenotypic analysis of bone tissue in Pax5-/- and EBF-1-/- mice.
  • * Osteoclast differentiation assays using spleen cells from mutant mice.
  • * In vitro assessment of osteoblast function (proliferation, ALP).
  • * Measurement of serum osteocalcin and bone formation rates.

Main Results:

  • * Pax5-/- mice exhibited osteopenia with increased osteoclasts and reduced trabecular bone.
  • * EBF-1-/- mice showed increased osteoblasts, elevated bone formation rate, and expanded marrow adiposity.
  • * EBF-1 mRNA was detected in osteoblasts and adipocytes, suggesting a direct role.
  • * Loss of Pax5 and EBF-1 resulted in distinct bone phenotypes.

Conclusions:

  • * Pax5 and EBF-1 play critical, non-overlapping roles in regulating bone cell development and homeostasis.
  • * The study highlights unexpected links between B cell transcription factors and skeletal biology.
  • * Further research is needed to elucidate the mechanisms behind these effects on bone.