Cited by 350Bone Metabolism and DiseasesPI3K/AKT/mTOR signaling in cancerRheumatoid Arthritis Research and Therapies

M-CSF, TNFα and RANK ligand promote osteoclast survival by signaling through mTOR/S6 kinase

Glantschnig, H, Fisher, J E, Wesolowski, G, Rodan, G A, Reszka, A A·2003·Cell Death & Differentiation

Abstract

Multinucleated bone-resorbing osteoclasts (Ocl) are cells of hematopoietic origin that play a major role in osteoporosis pathophysiology. Ocl survival and activity require M-CSF and RANK ligand (RANKL). M-CSF signals to Akt, while RANKL, like TNFalpha, activates NF-kappaB. We show here that although these are separate pathways in the Ocl, signaling of all three cytokines converges on mammalian target of rapamycin (mTOR) as part of their antiapoptotic action. Accordingly, rapamycin blocks M-CSF- and RANKL-dependent Ocl survival inducing apoptosis, and suppresses in vitro bone resorption proportional to the reduction in Ocl number. The cytokine signaling intermediates for mTOR/ribosomal protein S6 kinase (S6K) activation include phosphatidylinositol-3 kinase, Akt, Erks and geranylgeranylated proteins. Inhibitors of these intermediates suppress cytokine activation of S6K and induce Ocl apoptosis. mTOR regulates protein translation acting via S6K, 4E-BP1 and S6. We find that inhibition of translation by other mechanisms also induces Ocl apoptosis, demonstrating that Ocl survival is highly sensitive to continuous de novo protein synthesis. This study thus identifies mTOR/S6K as an essential signaling pathway engaged in the stimulation of cell survival in osteoclasts.

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Crossref · 10.1038/sj.cdd.4401285

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  • TNF-α has a direct insulin-independent effect on S6K and ERK-1/2 in cultured cells.

    “TNF-α has been shown to have a direct (insulin-independent) effecton S6K and ERK-1/2 in cultured cells [42, 43].”

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Authors
Glantschnig, H., Fisher, J. E., Wesolowski, G., Rodan, G. A., & Reszka, A. A.
Affiliations
Merck & Co., Inc., Rahway, NJ, USA (United States) (US)
Corresponding author
Reszka, A A
Venue
Cell Death & Differentiation
Published
2003-09-19
Volume
10
Issue
10
Pages
1165-1177
ISSN
  • 1350-9047 (ISSN-L)
  • 1476-5403
OpenAlex
W1560301770
Cited by
350
References
64
Citations by year
2026: 6 · 2025: 16 · 2024: 11 · 2023: 9 · 2022: 15 · 2021: 15 · 2020: 19 · 2019: 18 · 2018: 21 · 2017: 13 · 2016: 18 · 2015: 20 · 2014: 23 · 2013: 14 · 2012: 13
FWCI
4.37
Type
journal article
Language
en
Open access
closed
Locations
  • Cell Death and Differentiation (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Bone Metabolism and Diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
  • Health Sciences › Medicine › Rheumatology › Rheumatoid Arthritis Research and Therapies
Keywords
osteoclasts, osteoclast survival, mTOR, S6 kinase, macrophage colony-stimulating factor, RANK ligand, TNF-α, apoptosis, bone resorption, osteoporosis, Akt signaling, NF-κB, phosphatidylinositol 3-kinase, mRNA translation, 4E-BP1, rapamycin
MeSH terms
Tartrate-Resistant Acid Phosphatase, Serine-Threonine Kinase 3, Hippo Kinases, Acid Phosphatase, Actins, Animals, Bone Marrow Cells, Bone Resorption, Carrier Proteins, Cell Survival, Collagen, Diterpenes, Enzyme Inhibitors, Immunohistochemistry, Interleukin-1, Isoenzymes, Membrane Glycoproteins, Models, Biological, Osteoclasts, Peptides, Phosphoproteins, Protein Kinases, Protein Synthesis Inhibitors, Proto-Oncogene Proteins, Tumor Necrosis Factor-alpha, Blotting, Western, Signal Transduction, Macrophage Colony-Stimulating Factor, Cytokines, NF-kappa B, Apoptosis, Protein Serine-Threonine Kinases, Cell Cycle Proteins, Alendronate, Alkyl and Aryl Transferases, Sirolimus, Caspases, Collagen Type I, Ribosomal Protein S6, Ribosomal Protein S6 Kinases, 70-kDa, Eukaryotic Initiation Factors, Adaptor Proteins, Signal Transducing, Proto-Oncogene Proteins c-akt, Mice, Caspase 3, RANK Ligand, Receptor Activator of Nuclear Factor-kappa B, Caspase 9, TOR Serine-Threonine Kinases

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