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Osteoclasts in Bone Remodeling

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...

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Updated: May 11, 2025

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

Published on: July 3, 2020

Matrix Metalloproteinase-9 Enhances Osteoclastogenesis: Insights from Transgenic Rabbit Bone Marrow Models and In

Yajie Chen^1,2, Jialun Zou¹, Manabu Niimi²

¹Guangdong Province Key Laboratory, Southern China Institute of Large Animal Models for Biomedicine, School of Pharmacy and Food Engineering, Wuyi University, Jiangmen 529020, China.

International Journal of Molecular Sciences

|April 17, 2025

Summary

This summary is machine-generated.

Matrix metalloproteinase-9 (MMP-9) enhances osteoclastogenesis and suppresses inflammation, offering potential therapeutic benefits for osteoporosis. This study clarifies MMP-9

Keywords:

MMP-9 bone marrow cells inflammation osteoclast transgenic rabbit

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Skeletal Phenotype Analysis of a Conditional Stat3 Deletion Mouse Model

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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:

Cell Biology
Immunology
Biochemistry

Background:

Osteoclastogenesis, crucial for bone remodeling, is primarily regulated by receptor activator of nuclear factor kappa-B ligand (RANKL) signaling.
The precise role of matrix metalloproteinase-9 (MMP-9) in osteoclast differentiation and its interplay with inflammatory pathways remain incompletely understood and debated.

Purpose of the Study:

To investigate the specific function of matrix metalloproteinase-9 (MMP-9) in regulating osteoclastogenesis.
To elucidate the impact of MMP-9 overexpression on inflammatory cytokine production during osteoclast differentiation.
To assess the therapeutic potential of MMP-9 modulation for managing osteoporosis.

Main Methods:

Development of a high-yield osteoclastogenesis system using cryopreserved rabbit bone marrow cells stimulated with Macrophage colony-stimulating factor (M-CSF) and RANKL.
Comparative analysis of osteoclastogenesis and cytokine profiles in MMP-9 transgenic rabbits (macrophage-specific overexpression) and wild-type controls.
Assessment of osteoclastogenesis and inflammatory cytokine levels in RAW264.7 macrophages stably transfected with human MMP-9.

Main Results:

MMP-9 overexpression significantly increased osteoclastogenesis by 5.5-fold in the presence of RANKL (p < 0.01).
Overexpression of MMP-9 led to a notable suppression of key inflammatory cytokines, including IL-1β and TNF-α.
RAW264.7 macrophages engineered to overexpress MMP-9 demonstrated both enhanced osteoclastogenesis and reduced inflammatory cytokine production.

Conclusions:

Matrix metalloproteinase-9 (MMP-9) functions as a dual regulator, promoting osteoclastogenesis while concurrently inhibiting inflammatory responses.
These findings suggest that MMP-9 holds significant therapeutic promise for the management of bone-related disorders, particularly osteoporosis.