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Regulatory cellular and molecular networks in the bone microenvironment during aging
Lingli Zhang1, Zhikun Wang2, Yuan Zhang1
1School of Athletic Performance, Shanghai University of Sport, Shanghai 200438, China.
Life Medicine
|January 28, 2025
Summary
Aging disrupts bone metabolism by impairing bone marrow mesenchymal stem cells (BMSCs) and altering key signaling pathways, leading to bone loss and increased marrow fat. Understanding these changes is vital for addressing age-related bone degradation.
Area of Science:
- Gerontology
- Bone Biology
- Cellular Signaling
Background:
- Aging disrupts bone metabolism, leading to an imbalance between bone resorption and formation.
- Bone homeostasis is significantly influenced by signaling pathways, and their dysregulation contributes to age-related bone degradation.
- Aging compromises bone marrow mesenchymal stem cells (BMSCs) functionality, resulting in tissue dysfunction and pathological aging.
Purpose of the Study:
- To review the impact of aging on bone, focusing on bone cell states and signaling pathway transformations.
- To investigate age-related signaling pathways, including BMP/Smad, Wnt/β-catenin, OPG/RANKL/RANK, Cx43/miR21, and Nrf2/ARE.
- To enhance understanding of crucial bone cells and their secretory phenotypes during aging.
Main Methods:
- Literature review of aging's effects on bone metabolism and cellular signaling.
- Analysis of age-related changes in bone cell function and differentiation.
- Examination of molecular mechanisms governing bone signaling pathways in aging.
Main Results:
- Age-related bone degradation is characterized by reduced bone formation and increased bone marrow fat accumulation.
- Cellular senescence diminishes bone cell vitality, disrupting the balance of bone remodeling.
- Increased osteoclast differentiation leads to heightened bone resorption.
Conclusions:
- Aging significantly impacts bone health by altering cellular functions and disrupting critical signaling pathways.
- Specific pathways like BMP/Smad, Wnt/β-catenin, and OPG/RANKL/RANK are crucial in mediating age-related bone changes.
- Further investigation into these molecular mechanisms is essential for developing interventions against age-related bone diseases.
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