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Published on: June 8, 2014
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Role of inflammation in the aging bones
Samir M Abdelmagid1, Mary F Barbe2, Fayez F Safadi3
1Department of Anatomy and Neurobiology, Northeast Ohio Medical University (NEOMED) School of Medicine, Rootstown, OH 44272, USA.
Life Sciences
|December 17, 2014
Summary
Aging increases chronic inflammation, impacting bone health and tissue repair. This review explores how M1 and M2 macrophages influence bone cells during aging, crucial for understanding age-related bone loss.
Area of Science:
- Gerontology
- Immunology
- Bone Biology
Background:
- Aging is associated with chronic inflammation, characterized by elevated inflammatory cytokines.
- This chronic inflammation contributes to bone loss, reduced adaptation, and impaired tissue repair.
- Mesenchymal stem cell (MSC) differentiation and osteoblastogenesis are negatively affected by aging.
Purpose of the Study:
- To review the role of macrophages in MSC and hematopoietic stem cell (HSC) differentiation and function during aging.
- To elucidate the potential roles of pro-inflammatory (M1) and anti-inflammatory (M2) macrophages in aging-related bone remodeling.
- To understand the impact of aging on macrophage involvement in osteoblast and osteoclast differentiation.
Main Methods:
- Literature review focusing on aging, inflammation, macrophages, MSCs, HSCs, osteoblasts, and osteoclasts.
- Analysis of studies investigating cytokine profiles in aged versus young mammals.
- Synthesis of current knowledge on macrophage polarization (M1/M2) and its effects on bone metabolism in aging.
Main Results:
- Aging is linked to increased circulating pro-inflammatory cytokines.
- Pro-inflammatory cytokines enhance myelopoiesis and osteoclastogenesis in aged individuals.
- Macrophages are critical for osteoblast differentiation, HSC maintenance, and bone repair, but their aging-related functions require further study.
Conclusions:
- Macrophages, particularly M1 and M2 subtypes, likely play significant roles in age-related bone loss and impaired repair.
- Understanding macrophage function in aging is key to addressing bone health decline.
- Further research is needed to fully delineate the specific contributions of different macrophage phenotypes to bone aging.
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