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Related Experiment Video

Updated: Jul 8, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

Published on: February 28, 2017

Stimulation by TLR5 modulates osteoclast differentiation through STAT1/IFN-beta.

Hyunil Ha¹, Jong-Ho Lee, Ha-Neui Kim

¹Department of Cell and Developmental Biology, Dental Research Institute, School of Dentistry, Seoul National University, 28 Yeongon-Dong, Jongro-Gu, Seoul, Republic of Korea.

Journal of Immunology (Baltimore, Md. : 1950)

|January 23, 2008

Summary

Flagellin, a TLR5 ligand, suppresses osteoclast formation by down-regulating c-Fos via IFN-beta and STAT1 signaling. This reveals a key mechanism in immune-mediated bone remodeling.

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Last Updated: Jul 8, 2026

Stimulation of Notch Signaling in Mouse Osteoclast Precursors

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Published on: February 28, 2017

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation

Published on: March 15, 2018

Area of Science:

Immunology
Cell Biology
Bone Biology

Background:

Osteoclasts are crucial for bone resorption, differentiating from monocyte-macrophage precursors.
Toll-like receptor (TLR) stimulation influences osteoclast differentiation, but mechanisms are unclear.
Understanding TLR modulation of osteoclastogenesis is vital for bone disease research.

Purpose of the Study:

To investigate the molecular mechanisms by which flagellin (TLR5 ligand) affects osteoclast differentiation.
To elucidate the role of c-Fos, NFATc1, IFN-beta, and STAT1 in flagellin-mediated osteoclastogenesis.
To determine how TLR5 activation impacts bone remodeling.

Main Methods:

Utilized bone marrow-derived macrophages and osteoblast co-cultures.
Assessed osteoclast differentiation, c-Fos and NFATc1 expression, and IFN-beta production.
Employed gene silencing (STAT1 deficiency) and pharmacological inhibitors (AG490).

Main Results:

Flagellin suppressed RANKL-induced osteoclastogenesis by inhibiting c-Fos protein, not mRNA.
IFN-beta production mediated flagellin's anti-osteoclastogenic effect, dependent on STAT1 activation.
STAT1 deficiency abrogated flagellin-induced IFN-beta production and anti-osteoclastogenic effects.

Conclusions:

IFN-beta is a critical mediator of flagellin's inhibitory effect on osteoclastogenesis.
STAT1 activation is essential for IFN-beta induction by TLR5 ligands and RANKL.
Flagellin's impact on osteoclastogenesis is context-dependent, involving IFN-beta in specific macrophage-based assays.