Cited by 80Bone Metabolism and DiseasesTGF-β signaling in diseasesCell death mechanisms and regulation

Transforming Growth Factor-β1 (TGF-β1) Induces Human Osteoclast Apoptosis by Up-regulating Bim

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Houde, Nicolas, Chamoux, Estelle, Bisson, Martine, Roux, Sophie·2009·Journal of Biological Chemistry

Abstract

Transforming growth factor-beta1 (TGF-beta1) is the most abundant TGF-beta isoform detected in bone and is an important functional modulator of osteoclasts. TGF-beta1 can induce osteoclast apoptosis; however, the apoptotic pathways involved in this process are not known. We show here that human osteoclasts express both type-I and type-II TGF-beta receptors. In the absence of survival factors, TGF-beta1 (1 ng/ml) induced osteoclast apoptosis. The expression of activated caspase-9, but not that of caspase-8, was increased by TGF-beta1 stimulation, and the rate of TGF-beta1-induced apoptosis was significantly lower in the presence of a caspase-9 inhibitor. To study further the mechanisms involved in TGF-beta1-induced osteoclast apoptosis, we investigated TGF-beta1 signaling, which primarily involves the Smad pathway, but also other pathways that may interfere with intracellular modulators of apoptosis, such as mitogen-activated protein (MAP) kinases and Bcl2 family members. We show here that early events consisted of a trend toward increased expression of extracellular signal-regulated kinase (ERK), and then TGF-beta1 significantly induced the activation of p38 and Smad2 in a time-dependent manner. These signaling cascades may activate the intrinsic apoptosis pathway, which involves Bim, the expression of which was increased in the presence of TGF-beta1. Furthermore, the rate of TGF-beta1-induced osteoclast apoptosis was lower when Bim expression was suppressed, and inhibiting the Smad pathway abolished Bim up-regulation following TGF-beta stimulation. This could correspond to a regulatory mechanism involved in the inhibition of osteoclast activity by TGF-beta1.

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Crossref · 10.1074/jbc.m109.019372

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Authors
Houde, N., Chamoux, E., Bisson, M., & Roux, S.
Affiliations
Université de Sherbrooke (CA)
Corresponding author
Roux, Sophie
Venue
Journal of Biological Chemistry
Publisher
Elsevier BV
Published
2009-08
Volume
284
Issue
35
Pages
23397-23404
ISSN
0021-9258 (ISSN-L)
OpenAlex
W2070825285
Cited by
80
References
39
Citations by year
2025: 3 · 2024: 4 · 2023: 2 · 2022: 8 · 2021: 2 · 2020: 6 · 2019: 7 · 2018: 5 · 2017: 4 · 2016: 4 · 2015: 2 · 2014: 3 · 2013: 6 · 2012: 7
FWCI
3.22
Type
journal article
Language
en
Open access
Locations
  • Journal of Biological Chemistry (publishedVersion, cc-by-nc-nd)
  • PubMed Central (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 › TGF-β signaling in diseases
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Cell death mechanisms and regulation
Keywords
TGF-β1, osteoclast apoptosis, building information modeling, Smad signaling, caspase-9, p38 MAPK, ERK, Smad2, TGF-beta receptor, mitochondrial apoptosis, Bcl-2 family proteins
MeSH terms
Bcl-2-Like Protein 11, Cells, Cultured, Female, Humans, Membrane Proteins, Osteoclasts, Proto-Oncogene Proteins, Signal Transduction, Up-Regulation, Apoptosis, Proto-Oncogene Proteins c-bcl-2, Apoptosis Regulatory Proteins, Caspase 8, Caspase 9, Transforming Growth Factor beta1

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