Endocrinology and Metabolism

Review Articles

Calcium & bone metabolism
Nuclear Factor-Kappa B Regulation of Osteoclastogenesis and Osteoblastogenesis: Brendan F. Boyce, Jinbo Li, Zhenqiang Yao, Lianping Xing; Endocrinol Metab. 2023;38(5):504-521. Published online September 26, 2023; DOI: https://doi.org/10.3803/EnM.2023.501

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Maintenance of skeletal integrity requires the coordinated activity of multinucleated bone-resorbing osteoclasts and bone-forming osteoblasts. Osteoclasts form resorption lacunae on bone surfaces in response to cytokines by fusion of precursor cells. Osteoblasts are derived from mesenchymal precursors and lay down new bone in resorption lacunae during bone remodeling. Nuclear factorkappa B (NF-κB) signaling regulates osteoclast and osteoblast formation and is activated in osteoclast precursors in response to the essential osteoclastogenic cytokine, receptor activator of NF-κB ligand (RANKL), which can also control osteoblast formation through RANK-RANKL reverse signaling in osteoblast precursors. RANKL and some pro-inflammatory cytokines, including tumor necrosis factor (TNF), activate NF-κB signaling to positively regulate osteoclast formation and functions. However, these cytokines also limit osteoclast and osteoblast formation through NF-κB signaling molecules, including TNF receptor-associated factors (TRAFs). TRAF6 mediates RANKL-induced osteoclast formation through canonical NF-κB signaling. In contrast, TRAF3 limits RANKL- and TNF-induced osteoclast formation, and it restricts transforming growth factor β (TGFβ)-induced inhibition of osteoblast formation in young and adult mice. During aging, neutrophils expressing TGFβ and C-C chemokine receptor type 5 (CCR5) increase in bone marrow of mice in response to increased NF-κB-induced CC motif chemokine ligand 5 (CCL5) expression by mesenchymal progenitor cells and injection of these neutrophils into young mice decreased bone mass. TGFβ causes degradation of TRAF3, resulting in decreased glycogen synthase kinase-3β/β-catenin-mediated osteoblast formation and age-related osteoporosis in mice. The CCR5 inhibitor, maraviroc, prevented accumulation of TGFβ+/CCR5+ neutrophils in bone marrow and increased bone mass by inhibiting bone resorption and increasing bone formation in aged mice. This paper updates current understanding of how NF-κB signaling is involved in the positive and negative regulation of cytokine-mediated osteoclast and osteoblast formation and activation with a focus on the role of TRAF3 signaling, which can be targeted therapeutically to enhance bone mass.

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The Role of Rosavin in the Pathophysiology of Bone Metabolism
Piotr Wojdasiewicz, Paweł Turczyn, Anna Lach-Gruba, Łukasz A. Poniatowski, Daryush Purrahman, Mohammad-Reza Mahmoudian-Sani, Dariusz Szukiewicz
International Journal of Molecular Sciences.2024; 25(4): 2117. CrossRef
The role of monocyte/macrophage chemokines in pathogenesis of osteoarthritis: A review
Hao Luo, Linfeng Li, Song Han, Tao Liu
International Journal of Immunogenetics.2024;[Epub] CrossRef
The effect of low-level laser therapy on osteoclast differentiation: Clinical implications for tooth movement and bone density
Chun-Yi Huang, Huynh Hoai Thuong Le, Hsiao-Chi Tsai, Chih-Hsin Tang, Jian-Hong Yu
Journal of Dental Sciences.2024;[Epub] CrossRef
Genetic Deficiency of the Long Pentraxin 3 Affects Osteogenesis and Osteoclastogenesis in Homeostatic and Inflammatory Conditions
Valentina Granata, Dario Strina, Maria Lucia Schiavone, Barbara Bottazzi, Alberto Mantovani, Antonio Inforzato, Cristina Sobacchi
International Journal of Molecular Sciences.2023; 24(23): 16648. CrossRef

Calcium & Bone Metabolism
Discontinuing Denosumab: Can It Be Done Safely? A Review of the Literature: Wei Lin Tay, Donovan Tay; Endocrinol Metab. 2022;37(2):183-194. Published online April 14, 2022; DOI: https://doi.org/10.3803/EnM.2021.1369

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Denosumab, which has been approved for the treatment of osteoporosis since 2010, is a fully humanised monoclonal antibody against a cytokine, receptor activator of nuclear factor kappa B ligand (RANKL), involved in bone resorption. Continued use of denosumab results in a potent and sustained decrease in bone turnover, an increase in bone mineral density (BMD), and a reduction in vertebral and hip fractures. The anti-resorptive effects of denosumab are reversible upon cessation, and this reversal is accompanied by a transient marked increase in bone turnover that is associated with bone loss, and of concern, an increased risk of multiple vertebral fractures. In this review, we outline the effects of denosumab withdrawal on bone turnover markers, BMD, histomorphometry, and fracture risk. We provide an update on recent clinical trials that sought to answer how clinicians can transition away from denosumab safely with follow-on therapy to mitigate bone loss and summarise the recommendations of various international guidelines.

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Loss of lower extremity bone mineral density 1 year after denosumab is discontinued in persons with subacute spinal cord injury
Christopher M. Cirnigliaro, Michael F. La Fountaine, J. Scott Parrott, Steven C. Kirshblum, Susan J. Sauer, Sue A. Shapses, Isa A. McClure, William A. Bauman
Osteoporosis International.2023; 34(4): 741. CrossRef
Persistence with Denosumab in Male Osteoporosis Patients: A Real-World, Non-Interventional Multicenter Study
Chaiho Jeong, Jeongmin Lee, Jinyoung Kim, Jeonghoon Ha, Kwanhoon Jo, Yejee Lim, Mee Kyoung Kim, Hyuk-Sang Kwon, Tae-Seo Sohn, Ki-Ho Song, Moo Il Kang, Ki-Hyun Baek
Endocrinology and Metabolism.2023; 38(2): 260. CrossRef

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