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Related Concept Videos

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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...
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Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a  complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

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A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro
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Published on: June 16, 2022

Dominant negative MCP-1 blocks human osteoclast differentiation.

Nigel A Morrison1, Christopher J Day, Geoff C Nicholson

  • 1School of Medical Science, Griffith University Gold Coast Campus, Parklands Drive, Southport, Queensland, 4215, Australia.

Journal of Cellular Biochemistry
|September 3, 2013
PubMed
Summary

Early induction of chemokine MCP-1 is crucial for human osteoclast differentiation. Blocking MCP-1 signaling significantly inhibits osteoclast formation, highlighting its role in the gene expression cascade.

Keywords:
7NDCALMODULINCFU-GMCHEMOKINE MCP-1 NFATHUMAN OSTEOCLASTINHIBITIONJUNMYELOID

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Human osteoclasts are essential for bone remodeling.
  • Osteoclast differentiation is a complex process involving specific signaling pathways.
  • Chemokines play a role in immune cell differentiation and function.

Purpose of the Study:

  • To investigate the role of chemokine MCP-1 in human osteoclast differentiation.
  • To elucidate the temporal relationship between MCP-1 expression and other key differentiation markers.
  • To determine if early MCP-1 induction is essential for osteoclastogenesis.

Main Methods:

  • Human osteoclasts were differentiated from umbilical cord blood precursors using RANKL and M-CSF.
  • Quantitative PCR (Q-PCR) was used for gene expression profiling.
  • A dominant-negative MCP-1 inhibitor (7ND) was employed to block MCP-1 signaling.

Main Results:

  • RANKL treatment induced over 1,000-fold increase in MCP-1 mRNA within 24 hours.
  • MCP-1 induction preceded the peak expression of CALM1, JUN, FOS, NFATc1, NFATc2, Cathepsin K, and TRAP.
  • Inhibition of MCP-1 signaling blocked CALM1, JUN, and NFATc2 induction, severely inhibiting osteoclast differentiation.

Conclusions:

  • Early MCP-1 induction is a critical early event in the cascade of gene expression during human osteoclast differentiation.
  • MCP-1 signaling is essential for the subsequent induction of key transcription factors and differentiation markers.
  • Targeting MCP-1 may offer a therapeutic strategy for modulating osteoclast-related bone diseases.