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Role of Hematopoietic Growth Factors

Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
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Related Experiment Video

Updated: Jul 12, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors
08:01

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

HMGB1 is a bone-active cytokine.

Jieping Yang1, Rita Shah, Alexander G Robling

  • 1Department of Anatomy & Cell Biology, Indiana University School of Medicine, Indianapolis, Indiana 46202, USA.

Journal of Cellular Physiology
|September 6, 2007
PubMed
Summary

High mobility group box 1 (HMGB1) released by dying bone cells signals bone resorption. Parathyroid hormone (PTH) reduces HMGB1 release, impacting bone remodeling.

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Bone Conditioned Medium: Preparation and Bioassay
07:18

Bone Conditioned Medium: Preparation and Bioassay

Published on: July 8, 2015

Area of Science:

  • Bone biology
  • Immunology
  • Cellular signaling

Background:

  • High mobility group box 1 (HMGB1) is a cytokine involved in immune responses and tissue repair.
  • HMGB1 is released by bone cells, and its release by osteoblasts is regulated by parathyroid hormone (PTH).
  • HMGB1 may act as a chemoattractant for bone cells during ossification.

Purpose of the Study:

  • To investigate the role of HMGB1 in the bone microenvironment.
  • To characterize HMGB1 release mechanisms by bone cells.
  • To explore differential cellular responses to HMGB1.

Main Methods:

  • Characterization of recombinant HMGB1 (rHMGB1) effects on murine bone cell preparations.
  • Assessment of HMGB1 release from apoptotic bone cells.
  • Analysis of gene expression (RANKL/OPG) and cytokine release (TNFα, IL-6).
  • Investigation of GSK-3β phosphorylation and caspase-3 cleavage.

Main Results:

  • rHMGB1 increased RANKL/OPG ratio and TNFα/IL-6 release in bone marrow stromal cells (BMSCs), but not MC3T3-E1 cells.
  • rHMGB1 induced GSK-3β phosphorylation in MC3T3-E1 cells, but not BMSCs.
  • Apoptotic bone cells, including MLO-Y4 osteocytes, released HMGB1, coinciding with caspase-3 activation.
  • PTH's anti-apoptotic effect on MC3T3-E1 cells correlated with decreased HMGB1 release.

Conclusions:

  • Apoptotic bone cells are a source of HMGB1.
  • HMGB1 acts as a bone resorption signal within the bone marrow.
  • Osteoblasts from intramembranous and endochondral ossification pathways show distinct responses to HMGB1.