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Related Concept Videos

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...
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.
Bone Structure01:55

Bone Structure

Within the skeletal system, the structure of a bone, or osseous tissue, can be exemplified in a long bone, like the femur, where there are two types of osseous tissue: cortical and cancellous.
Bones of the Upper Limb: Radius01:09

Bones of the Upper Limb: Radius

The radius is longer of the two bones that make up the human antebrachium or forearm. At the proximal end, the radius articulates with the capitulum of the humerus and the radial notch of the ulna to form the elbow joint. At the distal end, the radius articulates with the ulna via the ulnar notch, forming the distal radioulnar joint. Distally, the radius also attaches to the carpal wrist bones (scaphoid and lunate) to form the radiocarpal joint.
The radius has a nail-shaped head, and a short...
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...
Compact Bone01:27

Compact Bone

Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
Compact bone, also called cortical bone, is the denser, stronger of the two types of bone tissue. It is found under the periosteum and in the diaphyses of long bones, where it provides support and protection. The microscopic structural unit of compact bone is called an osteon, or haversian system. Each osteon is composed of concentric rings of calcified...

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A Novel Stretching Platform for Applications in Cell and Tissue Mechanobiology
16:46

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Published on: June 3, 2014

Runx2: of bone and stretch.

Panos G Ziros1, Efthimia K Basdra, Athanasios G Papavassiliou

  • 1Department of Biological Chemistry, Medical School, University of Athens, Athens 11527, Greece.

The International Journal of Biochemistry & Cell Biology
|July 28, 2007
PubMed
Summary

Runx2 is a crucial transcription factor for bone formation. Mechanical loading regulates Runx2 activity, linking mechanical signals to osteoblast function and bone remodeling via mechanotransduction.

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Area of Science:

  • Molecular Biology
  • Skeletal Biology
  • Biochemistry

Background:

  • Runx2 is a key transcriptional modulator of osteoblast differentiation, essential for bone formation and homeostasis.
  • Runx2 mutations in humans cause cleidocranial dysplasia, highlighting its critical role.
  • Runx2 binds to the osteoblast-specific cis-acting element 2 (OSE2) to regulate osteoblast-related genes.

Purpose of the Study:

  • To elucidate the role of Runx2 in osteoblast differentiation and bone homeostasis.
  • To investigate how external cues, particularly mechanical loading, modulate Runx2 activity.
  • To understand the integration of signaling pathways by Runx2 in osteoblast function.

Main Methods:

  • Analysis of Runx2 function in osteoblast differentiation.
  • Investigation of Runx2 binding to the OSE2 element.
  • Examination of signaling pathways influencing Runx2 activity.
  • Study of mechanical loading effects on Runx2 and osteoblast function.

Main Results:

  • Runx2-null mice lack osteoblasts and bone tissue, despite normal skeletal patterning.
  • Runx2 activity is modulated by various external cues and signaling pathways.
  • Mechanical loading is a critical signal that influences Runx2 activity through mechanotransduction.

Conclusions:

  • Runx2 is indispensable for osteoblast maturation and bone development.
  • Mechanical loading is a vital regulator of Runx2-mediated osteoblast function and bone remodeling.
  • Runx2 integrates diverse signaling pathways to control osteoblast activity and maintain skeletal homeostasis.