Cited by 197Cytokine Signaling Pathways and InteractionsSarcoma Diagnosis and TreatmentMesenchymal stem cell research

STAT3 activation by IL-6 from mesenchymal stem cells promotes the proliferation and metastasis of osteosarcoma

Tu, Bing, Du, Lin, Fan, Qi-Ming, Tang, Ze, Tang, Ting-Ting·2012·Cancer Letters

Abstract

We previously demonstrated that human mesenchymal stem cells (MSCs) promote the growth of osteosarcoma in the bone microenvironment. The aim of the present study was to further determine the effect of IL-6/STAT3 signaling on the progression of osteosarcoma. First, conditioned medium from MSCs was used to stimulate the growth of osteosarcoma cells (Saos-2) in vitro. We found that STAT3 was activated and that the activation could be blocked by an IL-6-neutralizing antibody. The inhibition of STAT3 in Saos-2 cells by siRNA or AG490 decreased cell proliferation, migration and invasion, down-regulated the mRNA expression of Cyclin D, Bcl-xL and Survivin and enhanced the apoptotic response. Furthermore, a nude mouse osteosarcoma model was established by injecting luciferase-labeled Saos-2 cells into the tibia, and the effect of STAT3 on tumor growth was determined by treating the mice with AG490. In vivo bioluminescence images showed that tumor growth was dramatically reduced in the AG490 group. In addition, STAT3 inhibition decreased the lung metastasis rate and prolonged the survival of these mice. After treatment with AG490, the protein levels of IL-6, p-STAT3 and PCNA were decreased, and the level of apoptosis in the tumor was increased. Altogether, these data indicate that MSCs in the bone microenvironment might promote the progression of osteosarcoma and protect tumor cells from drug-induced apoptosis through IL-6/STAT3 signaling.

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Crossref · 10.1016/j.canlet.2012.06.006

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  • Data from animal models indicates that mesenchymal stromal cells could increase chemoresistance.

    “Data from animal models indicates that mesenchymal stromal cells could accelerate pulmonary metastases, promote proliferation of sarcoma cells and increase chemoresistance.”
  • Interleukin-6 secreted from mesenchymal stromal cells activates STAT-3 in adjacent osteosarcoma cells in a concentration-dependent manner, promotes their proliferation, protects them from chemotherapeutic drugs such as cisplatin and enhances their migration and invasion properties.

    “IL-6 secreted from MSCs activates STAT-3 in adjacent osteosarcoma cells in a concentration-dependent manner, promotes their proliferation, protects them from chemotherapeutic drugs such as cisplatin and enhances their migration and invasion properties [82].”
  • Tumor extracellular vesicle-educated MSCs may promote osteosarcoma progression through IL-6 production and lung metastasis through STAT3 activation in tumor cells.

    “Recent studies, using the xenograft mouse model of OS, demonstrated that tumor extracellular vesicle-educated MSCs may promote osteosarcoma progression through IL-6 production and lung metastasis through STAT3 activation in tumor cells [119,120].”
  • Osteosarcoma cells educate mesenchymal stem cells by secreting TGFβ-containing extracellular vesicles, triggering MSC IL-6 release and activating a STAT3-mediated tumour progression programme that drives formation of metastatic foci in the lung.

    “Osteosarcoma cells educate these MSCs by secreting TGFβ-containing extracellular vesicles 60 , triggering MSC IL-6 release and activating a STAT3-mediated tumour progression programme that drives the formation of metastatic foci within the lung 61 .”

    From Osteosarcoma (2022) · cites this paper as [61]

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Authors
Tu, B., Du, L., Fan, Q.-M., Tang, Z., & Tang, T.-T.
Affiliations
Shanghai Jiao Tong University (CN)
Venue
Cancer Letters
Publisher
Elsevier BV
Published
2012-12
Volume
325
Issue
1
Pages
80-88
ISSN
0304-3835 (ISSN-L)
OpenAlex
W2115637208
Cited by
196
References
49
Citations by year
2026: 8 · 2025: 10 · 2024: 6 · 2023: 10 · 2022: 6 · 2021: 20 · 2020: 17 · 2019: 18 · 2018: 20 · 2017: 14 · 2016: 20 · 2015: 14 · 2014: 13 · 2013: 17 · 2012: 2
FWCI
7.27
Type
journal article
Language
en
Open access
closed
Locations
  • Cancer Letters (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Shanghai Science and Technology Development Foundation
  • National Natural Science Foundation of China
  • Science and Technology Development Fund
Topics
  • Health Sciences › Medicine › Oncology › Cytokine Signaling Pathways and Interactions
  • Health Sciences › Medicine › Pulmonary and Respiratory Medicine › Sarcoma Diagnosis and Treatment
  • Health Sciences › Medicine › Genetics › Mesenchymal stem cell research
Keywords
osteosarcoma, mesenchymal stem cells, STAT3 activation, IL-6/STAT3 signaling, tumor microenvironment, tumor cell proliferation, lung metastasis, apoptosis, AG490, cyclin D, Bcl-xL, survivin, Saos-2 cells, conditioned medium
MeSH terms
Survivin, Animals, Bone Neoplasms, Cell Movement, Humans, Male, Mice, Inbred BALB C, Mice, Nude, Neoplasm Invasiveness, Neoplasm Metastasis, Osteosarcoma, Transfection, Transplantation, Heterologous, Signal Transduction, Interleukin-6, Culture Media, Conditioned, Apoptosis, Disease Progression, Proliferating Cell Nuclear Antigen, Cell Line, Tumor, Cell Proliferation, STAT3 Transcription Factor, bcl-X Protein, Inhibitor of Apoptosis Proteins, Mice, Cyclin D, Mesenchymal Stem Cells

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