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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 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 Cells and Tissue01:30

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
Osteoblasts and Osteocytes
The osteoblast is the bone cell responsible for forming new bone tissue. It is found in the growing portions of bone, including the periosteum and...
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 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...

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Related Experiment Video

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Using Real-Time Cell Metabolic Flux Analyzer to Monitor Osteoblast Bioenergetics
09:43

Using Real-Time Cell Metabolic Flux Analyzer to Monitor Osteoblast Bioenergetics

Published on: March 1, 2022

Osteoblasts and bone formation.

Joana Caetano-Lopes1, Helena Canhão, João Eurico Fonseca

  • 1Unidade Investigacão em Reumatologia, Instituto de Medicina Molecular, Faculdade de Medicina da Universidade de Lisboa, Portugal.

Acta Reumatologica Portuguesa
|June 19, 2007
PubMed
Summary

Bone remodeling involves osteoblasts and osteoclasts. Key pathways like Wnt/beta-catenin and factors such as leptin influence bone mass, impacting bone formation and resorption. Understanding these is crucial for bone health.

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Last Updated: Jul 14, 2026

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Area of Science:

  • Bone biology and skeletal physiology.

Background:

  • Bone remodeling is a dynamic process involving osteoblast-mediated formation and osteoclast-mediated resorption.
  • Osteoblast differentiation is regulated by key genes (Cbfa1, Osx) and signaling pathways (Wnt/beta-catenin).
  • Leptin, a hormone from adipocytes, has a dual effect on bone metabolism.

Purpose of the Study:

  • To review the key molecular mechanisms regulating bone remodeling.
  • To highlight the roles of osteoblasts, osteoclasts, and regulatory pathways in bone homeostasis.
  • To discuss the influence of leptin on bone mass.

Main Methods:

  • Literature review of molecular and cellular mechanisms in bone biology.
  • Analysis of gene expression and signaling pathways involved in osteoblast differentiation.
  • Examination of the interplay between hormones, receptors, and bone cells.

Main Results:

  • Osteoblast differentiation is influenced by Cbfa1, Osx, and the Wnt/beta-catenin pathway.
  • Mutations in LRP5/6 disrupt osteoblast function and lead to bone diseases.
  • The balance between RANKL and OPG dictates osteoclast formation and activity.
  • Leptin exhibits both central and direct effects on osteoblast activity and bone mass.

Conclusions:

  • Bone remodeling is a complex process regulated by multiple molecular factors and signaling pathways.
  • Dysregulation of these pathways can lead to skeletal diseases.
  • Leptin's dual action presents a potential target for modulating bone mass.