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Bone Formation by Endochondral Ossification

Bone Formation by Endochondral Ossification

Bone formation, or ossification, begins around the sixth to seventh week of embryonic development. Most bones develop from a cartilaginous template through the process of endochondral ossification. Cartilage formation begins when clusters of mesenchymal cells differentiate into chondrocytes. These chondrocytes proliferate rapidly and secrete an extracellular matrix that becomes encased in a membrane called the perichondrium. The resulting cartilage model provides a template that resembles the...

Bone Formation by Intramembranous Ossification

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...

Mesenchymal Stem Cells

Mesenchymal Stem Cells

Mesenchymal stem cells (MSCs) are adult stem cells that can differentiate into most connective tissue cell types, except for hematopoietic cells, depending upon the source of MSCs. For example, bone-marrow-derived MSCs (BM-MSCs) can differentiate into osteocytes, hepatocytes, and pancreatic and neuronal cells. MSCs can be isolated from various sources such as bone marrow, placenta, adipose tissue, teeth, and Wharton’s jelly, a gelatinous substance in the umbilical cord. The ease of their access...

Bone Remodeling and Repair

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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...

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 bone...

Bone Remodeling

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Bone remodeling is a continuous and balanced process of bone resorption by osteoclasts and bone formation by osteoblasts. In adults, it helps maintain bone mass and calcium homeostasis. While mechanical stress can stimulate turnover as part of the normal maintenance and reparative process, several hormones also regulate bone remodeling.

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Related Experiment Video

Updated: Jul 14, 2026

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Culture of Murine Embryonic Metatarsals: A Physiological Model of Endochondral Ossification

Published on: December 3, 2016

Osterix/Sp7 regulates mesenchymal stem cell mediated endochondral ossification.

Lee A Kaback¹, Do Y Soung, Amish Naik

¹The Center for Musculoskeletal Research, University of Rochester, Rochester, New York, USA.

Journal of Cellular Physiology

|June 21, 2007

Summary

The zinc finger protein Osterix (Osx) is crucial for bone formation, regulating both the inhibition of cartilage development and the promotion of osteoblast maturation during endochondral ossification and fracture healing.

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Last Updated: Jul 14, 2026

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Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis

Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis

Published on: December 18, 2019

Area of Science:

Molecular Biology
Developmental Biology
Orthopedics

Background:

Endochondral ossification is a complex process involving cartilage formation and replacement by bone.
The transcription factor Osterix (Osx) is known to play a role in osteoblast differentiation.
Understanding Osx's precise function in regulating chondrogenesis and osteogenesis is essential for bone repair research.

Purpose of the Study:

To investigate the expression and regulation of Osterix (Osx) during endochondral ossification in mice.
To elucidate the molecular mechanisms by which Osx influences chondrocyte and osteoblast differentiation.
To determine Osx's role in bone fracture healing.

Main Methods:

Analysis of Osx mRNA and protein expression during mouse embryogenesis and in a fracture healing model.
RNA isolation from fracture callus for transcript analysis.
Utilizing limb bud-derived MLB13MYC Clone 17 cells for in vitro studies.
Performing gain and loss of function experiments for Osx in cell cultures.

Main Results:

Osx expression is restricted to immature chondro/osteoprogenitor cells and mature osteoblasts, excluding hypertrophic chondrocytes.
Osx expression patterns in fracture callus mirror mesenchymal progenitor cells and immature osteoblasts.
Osx transcripts correlate with Runx2 and overlap with cartilage and bone markers.
PTHrP inhibits chondrocyte maturation but enhances Osx mRNA levels.
Osx inhibits chondrogenesis and chondrocyte maturation while promoting osteoblast maturation.

Conclusions:

Osx acts as a key regulator in endochondral ossification, inhibiting chondrocyte differentiation and promoting osteoblast differentiation.
Osx plays a significant role in bone fracture repair by modulating the balance between cartilage and bone formation.
These findings reveal novel molecular mechanisms of Osx function in bone development and repair.