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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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A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

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Published on: June 16, 2022

Fluorescence-Based Real-Time Analysis of Osteoclast Development.

Áron Pánczél¹, Simon P Nagy¹, János Farkas¹

¹Department of Physiology, Semmelweis University School of Medicine, Budapest, Hungary.

Frontiers in Cell and Developmental Biology

|July 30, 2021

Summary

New fluorescence assays enable real-time tracking of osteoclast development from myeloid cells. These methods facilitate automated quantification and drug screening for bone resorption disorders.

Keywords:

Cre recombinase cell fusion fluorescence microscopy fluorescent Cre-reporter myeloid cell differentiation osteoclasts

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Last Updated: Oct 26, 2025

A Simple Pit Assay Protocol to Visualize and Quantify Osteoclastic Resorption In Vitro

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Published on: June 16, 2022

Differentiation of Functional Osteoclasts from Human Peripheral Blood CD14+ Monocytes

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Published on: January 27, 2023

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Isolation, Purification, and Differentiation of Osteoclast Precursors from Rat Bone Marrow

Published on: May 19, 2019

Area of Science:

Cell Biology
Biochemistry
Biotechnology

Background:

Osteoclasts are crucial for bone remodeling, but their development is complex.
Current methods for studying osteoclasts are manual and hinder real-time analysis.
Novel tools are needed for high-throughput screening of osteoclast-modulating drugs.

Purpose of the Study:

To develop and validate fluorescence-based assays for real-time analysis of osteoclast development.
To enable automated quantification of osteoclast formation and fusion.
To facilitate drug discovery for bone resorption diseases.

Main Methods:

Developed two fluorescence assays (FRAMCO1.1 and FRAMCO1.2) using Ctsk-Cre and mTmG reporter systems.
Utilized osteoclast-specific cathepsin K promoter for Cre recombinase expression.
Employed high-content confocal fluorescence imaging and automated quantification.
Validated assays with lisophosphatidylcholine, an inhibitor of osteoclast fusion.

Main Results:

FRAMCO1.1 demonstrated robust red-to-green fluorescence conversion within 3 days in bone marrow cultures.
FRAMCO1.2 showed measurable red-to-green conversion in multinuclear cells within 5 days.
Assays specifically detected osteoclast development, not macrophage differentiation.
Assay performance was confirmed at DNA, mRNA, and protein levels.

Conclusions:

The FRAMCO assays provide high-throughput, automated, real-time analysis of osteoclast development.
These tools significantly advance the study of osteoclast biology and drug screening.
Facilitates the identification of novel therapeutic agents for bone resorption disorders.