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International Journal of Molecular Medicine
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Article

IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways

  • Authors:
    • Chun Guo
    • Xu-Guang Yang
    • Fei Wang
    • Xu-Yuan Ma
  • View Affiliations / Copyright

    Affiliations: Department of Medicine, Luohe Medical College, Luohe, Henan 462002, P.R. China, Huaihe Hospital, Henan University, Kaifeng, Henan 475000, P.R. China
  • Pages: 319-327
    |
    Published online on: May 25, 2016
       https://doi.org/10.3892/ijmm.2016.2606
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Abstract

Interleukin (IL)-1 is a proinflammatory cytokine that plays important roles in inflammation and host responses to infection. The present study aimed to evaluate the effects of IL-1α on the apoptosis and differentiation of osteoblasts, and to elucidate the mechanism responsible for these effects in the osteoblast‑like cell line MC3T3-E1. The MC3T3-E1 cells were non-treated or treated with IL-1α. Following treatment, cell viability, alkaline phosphatase (ALP) activity and caspase-3 activity were evaluated. The expression of osteoblast-specific genes as well as Bax, Bcl-2 and caspase-3 were determined by reverse transcription-quantitative polymerase chain reaction (RT-qPCR). The protein levels of Bax, Bcl-2, caspase-3 and the phosphorylation of mitogen-activated protein kinases (MAPKs, also known as MAP kinases) were evaluated using western blot analysis. The MAPK signaling pathway was blocked by pre-treatment with MAPK inhibitors SB203580, PD98059 and SP600125. IL-1α treatment induced a significant decrease in cell viability and ALP activity in the MC3T3-E1 cells. IL-1α also significantly decreased the mRNA expression and protein levels of osteoblast-related genes in the MC3T3-E1 cells. On the other hand, IL-1α significantly upregulated the mRNA expression and protein levels of Bax and caspase-3 as well as caspase-3 activity, whereas Bcl-2 expression was decreased in the MC3T3-E1 cells. Furthermore, IL-1α activated the apoptotic signaling pathway by increasing the phosphorylation of c-Jun N-terminal kinase (JNK) and p38-MAPK, whereas it inhibited the phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2). Moreover, pre-treatment with MAPK inhibitors attenuated the phosphorylation of JNK, p38 and Bax expression enhanced by IL-1α. However, MAPK inhibitors markedly increased the protein expression of osteoblast-related genes and Bcl-xL in the MC3T3-E1 cells downregulated by IL-1α. Taken together, these findings suggest that IL-1α induces the apoptosis of osteoblasts and inhibits osteoblast differentiation by activating the JNK and the p38 MAPK pathways.
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Copy and paste a formatted citation
Spandidos Publications style
Guo C, Yang X, Wang F and Ma X: IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways. Int J Mol Med 38: 319-327, 2016.
APA
Guo, C., Yang, X., Wang, F., & Ma, X. (2016). IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways. International Journal of Molecular Medicine, 38, 319-327. https://doi.org/10.3892/ijmm.2016.2606
MLA
Guo, C., Yang, X., Wang, F., Ma, X."IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways". International Journal of Molecular Medicine 38.1 (2016): 319-327.
Chicago
Guo, C., Yang, X., Wang, F., Ma, X."IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways". International Journal of Molecular Medicine 38, no. 1 (2016): 319-327. https://doi.org/10.3892/ijmm.2016.2606
Copy and paste a formatted citation
x
Spandidos Publications style
Guo C, Yang X, Wang F and Ma X: IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways. Int J Mol Med 38: 319-327, 2016.
APA
Guo, C., Yang, X., Wang, F., & Ma, X. (2016). IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways. International Journal of Molecular Medicine, 38, 319-327. https://doi.org/10.3892/ijmm.2016.2606
MLA
Guo, C., Yang, X., Wang, F., Ma, X."IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways". International Journal of Molecular Medicine 38.1 (2016): 319-327.
Chicago
Guo, C., Yang, X., Wang, F., Ma, X."IL-1α induces apoptosis and inhibits the osteoblast differentiation of MC3T3-E1 cells through the JNK and p38 MAPK pathways". International Journal of Molecular Medicine 38, no. 1 (2016): 319-327. https://doi.org/10.3892/ijmm.2016.2606
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