Open Access

Osteoclast regulation of osteoblasts via RANK‑RANKL reverse signal transduction in vitro

  • Authors:
    • Shiqian Zhang
    • Xiaoyu Wang
    • Guojun Li
    • Yang Chong
    • Jie Zhang
    • Xinzhen Guo
    • Baoxin Li
    • Zhenggang Bi
  • View Affiliations

  • Published online on: July 20, 2017     https://doi.org/10.3892/mmr.2017.7039
  • Pages: 3994-4000
  • Copyright: © Zhang et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

The treatment of osteoporosis typically inhibits the activity of osteoclasts, which subsequently results in the suppression of bone formation and maintenance, however the underlying mechanism remains to be elucidated. The receptor activator of nuclear factor κ‑B ligand (RANKL)‑receptor activator of nuclear factor κ‑B (RANK) signaling axis is important in the osteoblast regulation of osteoclasts. RANKL surface‑bound molecules expressed on T cells stimulate a reverse signaling transduction in order to regulate the T cells, therefore the present study hypothesized that RANKL expressed on osteoblasts may transfer reverse signals to regulate osteoblasts. A series of experiments were designed to test the hypothesis, using MTT, stealth RNA interference, reverse transcription‑quantitative polymerase chain reaction, western blot analysis, alkaline phosphatase activity assay and alizarin red staining. The present study observed the role of RANK‑RANKL reverse signaling on osteoblasts, regulated by osteoclasts. Osteoblasts were treated with recombinant RANK proteins. The soluble RANK enhanced the mineralization of osteoblasts. When the RANKL was knocked down in the osteoblast, RANK demonstrated a weak osteogenic effect on the RANKL‑deficient osteoblast compared with the wild‑type osteoblast which served as a control. Addition of soluble RANK activated the p38 mitogen activated protein kinase (MAPK) signaling pathway in the osteoblast and blocking this same pathway in E1 cells reduced the effect of RANK. In the co‑culture system of osteoblasts and osteoclasts, p38 MAPK in E1 cells was phosphorylated a short time following co‑culture and the phosphorylation then blocked by abundant soluble RANKL. The findings suggested that RANKL expressed on osteoblasts transferred reverse signals from the exterior of the cell to the interior, which regulated the osteoblasts.

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October-2017
Volume 16 Issue 4

Print ISSN: 1791-2997
Online ISSN:1791-3004

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Spandidos
Zhang S, Wang X, Li G, Chong Y, Zhang J, Guo X, et al: Osteoclast regulation of osteoblasts via RANK‑RANKL reverse signal transduction in vitro. Mol Med Rep 16: 3994-4000, 2017
APA
Zhang, S., Wang, X., Li, G., Chong, Y., Zhang, J., Guo, X. ... Bi, Z. (2017). Osteoclast regulation of osteoblasts via RANK‑RANKL reverse signal transduction in vitro. Molecular Medicine Reports, 16, 3994-4000. https://doi.org/10.3892/mmr.2017.7039
MLA
Zhang, S., Wang, X., Li, G., Chong, Y., Zhang, J., Guo, X., Li, B., Bi, Z."Osteoclast regulation of osteoblasts via RANK‑RANKL reverse signal transduction in vitro". Molecular Medicine Reports 16.4 (2017): 3994-4000.
Chicago
Zhang, S., Wang, X., Li, G., Chong, Y., Zhang, J., Guo, X., Li, B., Bi, Z."Osteoclast regulation of osteoblasts via RANK‑RANKL reverse signal transduction in vitro". Molecular Medicine Reports 16, no. 4 (2017): 3994-4000. https://doi.org/10.3892/mmr.2017.7039