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Related Concept Videos

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...
Insulin: The Receptor and Signaling Pathways01:28

Insulin: The Receptor and Signaling Pathways

Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but this inhibition is released...
Role of Hematopoietic Growth Factors01:28

Role of Hematopoietic Growth Factors

Hematopoietic growth factors are molecules that regulate the differentiation rate of hematopoietic stem cells (HSCs). Erythropoietin (EPO), primarily produced by the kidneys, plays a crucial role in erythrocyte production. When oxygen levels in the blood are low, EPO is released into the bloodstream, reaching the bone marrow, where it stimulates HSCs to differentiate and mature into erythrocytes, which are vital for oxygen transport.
Thrombopoietin (TPO), mainly released by the liver,...
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.
Role of Vitamins in Maintaining Bone Health01:25

Role of Vitamins in Maintaining Bone Health

The growth and maintenance of bone are regulated by a combination of nutritional factors, including vitamins, such as vitamin A, B12, C, D, and K.
Vitamin A
Vitamin A is involved in the process of bone remodeling. Retinoic acid, the active metabolite of Vitamin A, has nuclear receptors in osteoblasts and osteoclasts, which are involved in bone remodeling.
Vitamin B12
Vitamin B12 acts as a cofactor during the formation of osteoblast-related proteins, such as osteocalcin. Vitamin B12 plays a role...

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Related Experiment Video

Updated: May 21, 2026

An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation
08:48

An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation

Published on: June 30, 2015

The insulin-like growth factor system in bone: basic and clinical implications.

Masanobu Kawai1, Clifford J Rosen

  • 1Department of Bone and Mineral Research, Osaka Medical Center and Research Institute for Maternal and Child Health, Izumi, Osaka, Japan.

Endocrinology and Metabolism Clinics of North America
|June 12, 2012
PubMed
Summary

The insulin-like growth factor (IGF) system is vital for bone health. Research continues to uncover its role in skeletal homeostasis and bone disease, despite initial clinical limitations.

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Last Updated: May 21, 2026

An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation
08:48

An In Vitro Dormancy Model of Estrogen-sensitive Breast Cancer in the Bone Marrow: A Tool for Molecular Mechanism Studies and Hypothesis Generation

Published on: June 30, 2015

Area of Science:

  • Endocrinology
  • Bone Biology
  • Skeletal Physiology

Background:

  • The insulin-like growth factor (IGF) regulatory system plays a crucial role in skeletal development and maintenance.
  • Recombinant IGFs were initially considered for clinical applications in conditions like short stature, fracture repair, and osteoporosis.
  • Despite not meeting initial clinical expectations, ongoing research provides valuable insights into IGF's function in bone.

Purpose of the Study:

  • To review the significance of the IGF regulatory system in skeletal growth.
  • To discuss the role of IGF in skeletal maintenance and homeostasis.
  • To highlight the contribution of IGF to the pathophysiology of bone disorders.

Main Methods:

  • Literature review of basic and translational studies.
  • Synthesis of current understanding of IGF signaling in bone.
  • Analysis of the IGF system's involvement in skeletal health and disease.

Main Results:

  • The IGF system is fundamental for normal skeletal growth.
  • IGF signaling is integral to maintaining skeletal homeostasis throughout life.
  • Dysregulation of the IGF system is implicated in various bone pathologies.

Conclusions:

  • The IGF regulatory system is indispensable for skeletal growth and maintenance.
  • Continued research is essential for understanding IGF's complex roles in bone biology.
  • Insights from IGF research inform our understanding of bone disorders and potential therapeutic strategies.