Cited by 280Bone Metabolism and DiseasesRheumatoid Arthritis Research and TherapiesOsteomyelitis and Bone Disorders Research

Regulation of TNF-Induced Osteoclast Differentiation

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Yao, Zhenqiang, Getting, Stephen J., Locke, Ian C.·2021·Cells

Abstract

Increased osteoclast (OC) differentiation and activity is the critical event that results in bone loss and joint destruction in common pathological bone conditions, such as osteoporosis and rheumatoid arthritis (RA). RANKL and its decoy receptor, osteoprotegerin (OPG), control OC differentiation and activity. However, there is a specific concern of a rebound effect of denosumab discontinuation in treating osteoporosis. TNFα can induce OC differentiation that is independent of the RANKL/RANK system. In this review, we discuss the factors that negatively and positively regulate TNFα induction of OC formation, and the mechanisms involved to inform the design of new anti-resorptive agents for the treatment of bone conditions with enhanced OC formation. Similar to, and being independent of, RANKL, TNFα recruits TNF receptor-associated factors (TRAFs) to sequentially activate transcriptional factors NF-κB p50 and p52, followed by c-Fos, and then NFATc1 to induce OC differentiation. However, induction of OC formation by TNFα alone is very limited, since it also induces many inhibitory proteins, such as TRAF3, p100, IRF8, and RBP-j. TNFα induction of OC differentiation is, however, versatile, and Interleukin-1 or TGFβ1 can enhance TNFα-induced OC formation through a mechanism which is independent of RANKL, TRAF6, and/or NF-κB. However, TNFα polarized macrophages also produce anabolic factors, including insulin such as 6 peptide and Jagged1, to slow down bone loss in the pathological conditions. Thus, the development of novel approaches targeting TNFα signaling should focus on its downstream molecules that do not affect its anabolic effect.

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Crossref · 10.3390/cells11010132

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  • Different concentrations of TGF-β have different effects on the RANKL/OPG ratio and osteoclast differentiation: low concentrations increase stimulation of osteoclast differentiation, while high concentrations have the opposite effect.

    “Different concentrations of TGF-β have different effects on the RANKL/OPG ratio and ultimately on osteoclast differentiation (low concentrations of TGF-β increase the stimulation of osteoclast differentiation, while high concentrations of TGF-β have the opposite effect) [98, 99].”

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Authors
Yao, Z., Getting, S. J., & Locke, I. C.
Affiliations
  • University of Rochester Medicine (US)
  • University of Westminster (GB)
Corresponding author
Yao, Zhenqiang
Venue
Cells
Publisher
MDPI AG
Published
2021-12-31
Volume
11
Issue
1
Pages
132
ISSN
2073-4409 (ISSN-L)
OpenAlex
W4205952184
Cited by
280
References
201
Citations by year
2026: 45 · 2025: 87 · 2024: 69 · 2023: 54 · 2022: 25
FWCI
3.88
Type
journal article
Language
en
Open access
Locations
  • Cells (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • WestminsterResearch (University of Westminster) (acceptedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
National Institute on Aging (AG049994)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
  • Health Sciences › Medicine › Rheumatology › Osteomyelitis and Bone Disorders Research
Keywords
TNF-α, osteoclastogenesis, TNF receptor-associated factors, NF-κB signaling, NFATc1, TRAF3, interleukin-1, TGF-β1, osteoporosis, rheumatoid arthritis, bone loss, antiresorptive agents, Jagged1, macrophages
MeSH terms
Animals, Arthritis, Rheumatoid, Cell Differentiation, Humans, Osteoclasts, Osteoporosis, Tumor Necrosis Factor-alpha, Signal Transduction

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