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Related Concept Videos

Bone Disorders01:29

Bone Disorders

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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...
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Hormones and Bone Tissue01:17

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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: May 29, 2025

Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry
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Protein bioactive complexes promote osteogenesis under microgravity environment.

Anisha Kabir1, B Mukilarasi1, Anagha Manohar1

  • 1Department of Applied Mechanics and Biomedical Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu 600036, India.

International Journal of Biological Macromolecules
|February 4, 2025
PubMed
Summary
This summary is machine-generated.

Simulated microgravity causes bone loss by increasing oxidative stress. A novel zein nanocage formulation (ZNAC) effectively combats this, preserving bone health and promoting regeneration in preclinical models.

Keywords:
Antioxidants cocktailBone lossCytoskeletal damageMicrogravityProtein nanocagesROSZebrafish

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Area of Science:

  • Biomedical Engineering
  • Space Medicine
  • Materials Science

Background:

  • Space microgravity and cosmic radiation negatively impact bone mass.
  • The mechanisms of space-induced bone loss, particularly the role of oxidative stress, are not fully understood.
  • Existing treatments for bone loss have limitations in efficacy and side effects.

Purpose of the Study:

  • To investigate the effects of simulated microgravity (SMG) on osteoblasts and identify underlying mechanisms.
  • To develop and evaluate a novel antioxidant delivery system for mitigating space-induced bone loss.
  • To assess the potential of this new treatment for maintaining bone health in space.

Main Methods:

  • Simulated microgravity (SMG) was used to induce bone loss in MC3T3/MG63 osteoblasts and zebrafish scales.
  • Zein nanocages loaded with a chimeric antioxidant cocktail (ZNAC) were designed and characterized.
  • The efficacy of ZNAC in reducing reactive oxygen species (ROS), preserving cytoskeletal integrity, and promoting osteogenesis was evaluated.
  • Osteogenic gene expression, alkaline phosphatase (ALP) activity, and calcification were measured.

Main Results:

  • SMG induced ROS production, cytoskeletal damage, and downregulated osteogenic genes in osteoblasts.
  • ZNAC demonstrated excellent stability, biocompatibility, and antioxidant properties.
  • ZNAC effectively reduced SMG-induced ROS, preserved cytoskeletal integrity, and enhanced osteogenic markers in cell cultures.
  • In zebrafish scales, ZNAC promoted regeneration, increased osteogenic gene expression, and improved calcification.

Conclusions:

  • ZNAC is a promising therapeutic candidate for preventing and treating space-induced bone loss.
  • The developed zein nanocage system effectively delivers antioxidants to combat oxidative stress.
  • This approach holds potential for maintaining astronaut musculoskeletal health during long-duration space missions.