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Adiponectin Reduces Bone Stiffness: Verified in a Three-Dimensional Artificial Human Bone Model In Vitro
Sigrid Haugen1, Jianying He2, Alamelu Sundaresan3
1Department of Biomaterials, Institute for Clinical Dentistry, University of Oslo, Oslo, Norway.
Frontiers in Endocrinology
|June 6, 2018
Summary
Adiponectin, a hormone, was studied for its effect on bone strength. Results show adiponectin reduces bone stiffness by influencing cell growth and extracellular matrix, suggesting autocrine/paracrine roles in bone biomechanics.
Area of Science:
- Biomaterials Science
- Cell Biology
- Orthopedics
Background:
- Circulating adiponectin levels are negatively associated with bone mineral density (BMD) and bone strength.
- Understanding adiponectin's role in bone biomechanics is crucial for developing treatments for bone diseases.
Purpose of the Study:
- To investigate the effects of adiponectin on the mechanical properties and cellular morphology of bone-like tissue.
- To elucidate the molecular mechanisms underlying adiponectin's influence on osteoblasts and osteoclasts in vitro.
Main Methods:
- Generation of human osteoblast and osteoclast coculture osteospheres with and without adiponectin.
- Micro-computed tomography (micro-CT) scanning, nanoindentation for mechanical testing, and microscopy for cellular morphology.
- Quantitative polymerase chain reaction (qPCR), immunoassays, and rat femur bending tests to assess adiponectin levels and bone stiffness.
Main Results:
- Adiponectin treatment resulted in more compliant osteospheres with reduced bending stiffness.
- Adiponectin expression correlated positively with ultimate bending moment and energy absorption, but negatively with stiffness.
- Adiponectin enhanced osteoblast proliferation and collagen expression, and stimulated osteoclast proliferation.
Conclusions:
- Adiponectin exhibits autocrine and/or paracrine effects in bone, reducing bone tissue stiffness.
- The observed reduction in bone stiffness is potentially mediated by an increase in undifferentiated cells and extracellular matrix proteins like collagen.
- Findings suggest adiponectin plays a significant role in regulating bone biomechanical properties.
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