Lena Batoon1, Susan Marie Millard1, Liza Jane Raggatt1,2, Allison Robyn Pettit3,4. 1. Bones and Immunology Laboratory, Cancer Biology and Care Program, Mater Research Institute - The University of Queensland, Translational Research Institute, 37 Kent Street, Woolloongabba, QLD, 4102, Australia. 2. Faculty of Medicine, The University of Queensland, Herston, QLD, 4092, Australia. 3. Bones and Immunology Laboratory, Cancer Biology and Care Program, Mater Research Institute - The University of Queensland, Translational Research Institute, 37 Kent Street, Woolloongabba, QLD, 4102, Australia. allison.pettit@mater.uq.edu.au. 4. Faculty of Medicine, The University of Queensland, Herston, QLD, 4092, Australia. allison.pettit@mater.uq.edu.au.
Abstract
PURPOSE OF REVIEW: Mounting evidence supporting the critical contribution of macrophages, in particular osteal macrophages, to bone regeneration is reviewed. We specifically examine the potential role of macrophages in the basic multicellular units coordinating lifelong bone regeneration via remodelling and bone regeneration in response to injury. We review and discuss the distinctions between macrophage and osteoclast contributions to bone homeostasis, particularly the dichotomous role of the colony-stimulating factor 1-colony-stimulating factor 1 receptor axis. RECENT FINDINGS: The impact of inflammation associated with aging and other hallmarks of aging, including senescence, on macrophage function is addressed in the context of osteoporosis and delayed fracture repair. Resident macrophages versus recruited macrophage contributions to fracture healing are also discussed. We identify some of the remaining knowledge gaps that will need to be closed in order to maximise benefits from therapeutically modulating or mimicking the function of macrophages to improve bone health and regeneration over a lifetime.
PURPOSE OF REVIEW: Mounting evidence supporting the critical contribution of macrophages, in particular osteal macrophages, to bone regeneration is reviewed. We specifically examine the potential role of macrophages in the basic multicellular units coordinating lifelong bone regeneration via remodelling and bone regeneration in response to injury. We review and discuss the distinctions between macrophage and osteoclast contributions to bone homeostasis, particularly the dichotomous role of the colony-stimulating factor 1-colony-stimulating factor 1 receptor axis. RECENT FINDINGS: The impact of inflammation associated with aging and other hallmarks of aging, including senescence, on macrophage function is addressed in the context of osteoporosis and delayed fracture repair. Resident macrophages versus recruited macrophage contributions to fracture healing are also discussed. We identify some of the remaining knowledge gaps that will need to be closed in order to maximise benefits from therapeutically modulating or mimicking the function of macrophages to improve bone health and regeneration over a lifetime.
Entities:
Keywords:
Bone regeneration; Fracture repair; Inflammaging; Macrophages; Osteoporosis; Senescence
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