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Related Concept Videos

Bone Disorders01:29

Bone Disorders

Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
Bone deposition is also affected by the levels of sex hormones like estrogen and testosterone that promote osteoblast activity and bone matrix synthesis. When the level of these hormones decreases due to aging, it causes a reduction in bone deposition. As a result, bone resorption by osteoclasts...
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.
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...
Changes in the Appendicular Skeleton with Age01:09

Changes in the Appendicular Skeleton with Age

The upper and lower limb initially develops as a small bulge called a limb bud, which appears on the lateral side of the early embryo. The upper limb bud appears near the end of the fourth week of development, with the lower limb bud appearing shortly after.
Initially, the limb buds consist of a core of mesenchyme covered by a layer of ectoderm. The ectoderm at the end of the limb bud thickens to form a narrow crest called the apical ectodermal ridge. This ridge stimulates the underlying...
The Functions of the Skeletal System01:22

The Functions of the Skeletal System

The most apparent functions of the skeletal system are support, protection, and movement. However, bone tissue also performs several other critical metabolic functions. For one, the bone matrix acts as a reservoir for a number of minerals important to the functioning of the body, especially calcium and phosphorus. These minerals, present in the bone tissue, can be released back into the bloodstream when required. Calcium ions, for example, are essential for muscle contractions and controlling...
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...

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Related Experiment Video

Updated: Jun 13, 2026

Cantilever Bending of Murine Femoral Necks
06:44

Cantilever Bending of Murine Femoral Necks

Published on: January 5, 2022

Disuse osteopenia.

Susan A Bloomfield1

  • 1Department of Health and Kinesiology, MS 4243, Texas A&M University, College Station, TX, 77843, USA. sbloom@tamu.edu

Current Osteoporosis Reports
|April 29, 2010
PubMed
Summary
This summary is machine-generated.

Prolonged non-weight-bearing, like in spaceflight, causes rapid bone loss. Muscle contractions, even without weight-bearing, may help maintain bone mass by influencing pathways like sclerostin and Wnt/beta-catenin signaling.

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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy

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The Creation of a Rat Model for Osteosarcopenia via Ovariectomy
03:52

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Published on: February 21, 2025

Area of Science:

  • Bone biology
  • Spaceflight physiology
  • Skeletal integrity

Background:

  • Prolonged non-weight-bearing significantly accelerates bone loss, exceeding rates seen in conditions like postmenopausal osteoporosis.
  • Mechanisms of disuse osteopenia are multifactorial, involving interstitial fluid pressure, sympathetic nervous system activity, and bone marrow cell changes.

Purpose of the Study:

  • To investigate the role of muscle contraction independent of weight-bearing in preventing disuse osteopenia.
  • To explore the molecular mechanisms, including sclerostin and Wnt/beta-catenin signaling, underlying bone loss during disuse.

Main Methods:

  • Utilizing hindlimb unloaded rodent models to simulate disuse conditions.
  • Analyzing the impact of muscle contraction on bone mass and strength.
  • Investigating the regulation of Wnt/beta-catenin signaling by sclerostin.

Main Results:

  • Muscle contraction, independent of ground reaction forces, shows efficacy in preventing disuse osteopenia.
  • Sclerostin plays a key role in regulating Wnt/beta-catenin signaling, contributing to bone loss during disuse.
  • Data suggest that ground reaction forces may not be absolutely required for bone mass maintenance.

Conclusions:

  • Muscle contraction is a critical factor in preserving skeletal integrity during periods of unloading.
  • Targeting sclerostin and Wnt/beta-catenin signaling pathways presents potential therapeutic strategies for disuse-induced bone loss.