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Related Concept Videos

Osteoclasts in Bone Remodeling01:31

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 Formation by Endochondral Ossification01:24

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 Ossification01:29

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...
Bone Remodeling01:40

Bone Remodeling

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.
Hormones and Bone Tissue01:17

Hormones and Bone Tissue

The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
Hormones That Influence Osteoblasts and/or Maintain the Matrix
Several hormones are necessary for controlling bone growth and maintaining the bone matrix. The pituitary gland secretes growth hormone (GH), which, as its name implies, controls bone growth. This happens in several ways: first, it triggers chondrocyte...
Bone Remodeling and Repair01:31

Bone Remodeling and Repair

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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Related Experiment Video

Updated: Jun 4, 2026

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
09:37

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

Published on: March 15, 2018

FOXO1 modulates osteoblast differentiation.

Michelle F Siqueira1, Stephen Flowers, Rupa Bhattacharya

  • 1Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada. msiqueir@uwo.ca

Bone
|February 2, 2011
PubMed
Summary
This summary is machine-generated.

Forkhead box O1 (FOXO1) promotes osteoblast differentiation and bone formation. Depleting FOXO1 in pre-osteoblastic cells significantly reduces markers of bone development and mineralization.

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Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
10:52

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells

Published on: March 22, 2024

Related Experiment Videos

Last Updated: Jun 4, 2026

A RANKL-based Osteoclast Culture Assay of Mouse Bone Marrow to Investigate the Role of mTORC1 in Osteoclast Formation
09:37

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

Published on: March 15, 2018

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
10:52

Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells

Published on: March 22, 2024

Area of Science:

  • Cell Biology
  • Biochemistry
  • Orthopedics

Background:

  • Forkhead box O1 (FOXO1) is known to be upregulated during bone formation.
  • Bone morphogenetic proteins stimulate FOXO1 expression, suggesting a role in osteogenesis.

Purpose of the Study:

  • To investigate the functional role of FOXO1 in the terminal differentiation of pre-osteoblastic cells in vitro.
  • To determine the impact of FOXO1 on key markers of osteoblast differentiation and mineralization.

Main Methods:

  • Utilized MC3T3-E1 cells in mineralizing cultures with and without FOXO1 knockdown via RNA interference (RNAi).
  • Assessed RUNX2 DNA binding activity, alkaline phosphatase activity, and mRNA levels of key bone markers.
  • Performed chromatin immunoprecipitation assays to identify direct interactions with the RUNX2 promoter.

Main Results:

  • FOXO1 depletion significantly reduced osteoblast differentiation markers, including alkaline phosphatase activity and mRNA levels of RUNX2, collagen type 1, osteocalcin, and MMP13.
  • Knockdown of FOXO1 led to a decrease in mineralized nodule formation and RUNX2 promoter activity.
  • Overexpression of FOXO1 suppressed MC3T3-E1 cell proliferation without significantly affecting apoptosis.

Conclusions:

  • FOXO1 is crucial for promoting osteoblast differentiation and enhancing bone mineralization.
  • FOXO1 plays a dual role by also suppressing the proliferation of differentiating osteoblasts.