Fine-tuned ATP signals are acute mediators in osteocyte mechanotransduction

Tina Kringelbach, Derya Aslan, Ivana Novak, M. Ellegaard, Susanne Syberg, Christina Andersen, Kim Kristiansen, Ole Vang, Peter Schwarz, Niklas Jørgensen

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    Abstract

    Osteocytes are considered the primary mechanosensors of bone, but the signaling pathways they apply in mechanotransduction are still incompletely investigated and characterized. A growing body of data strongly indicates that P2 receptor signaling among osteoblasts and osteoclasts has regulatory effects on bone remodeling. Therefore, we hypothesized that ATP signaling is also applied by osteocytes in mechanotransduction. We applied a short fluid pulse on MLO-Y4 osteocyte-like cells during real-time detection of ATP and demonstrated that mechanical stimulation activates the acute release of ATP and that these acute ATP signals are fine-tuned according to the magnitude of loading. ATP release was then challenged by pharmacological inhibitors, which indicated a vesicular release pathway for acute ATP signals. Finally, we showed that osteocytes express functional P2X2 and P2X7 receptors and respond to even low concentrations of nucleotides by increasing intracellular calcium concentration. These results indicate that in osteocytes, vesicular ATP release is an acute mediator of mechanical signals and the magnitude of loading. These and previous results, therefore, implicate purinergic signaling as an early signaling pathway in osteocyte mechanotransduction.
    Original languageDanish
    JournalCellular Signalling
    Volume27
    Issue number12
    Pages (from-to)2401-2409
    ISSN0898-6568
    DOIs
    Publication statusPublished - 2015

    Cite this

    Kringelbach, T., Aslan, D., Novak, I., Ellegaard, M., Syberg, S., Andersen, C., Kristiansen, K., Vang, O., Schwarz, P., & Jørgensen, N. (2015). Fine-tuned ATP signals are acute mediators in osteocyte mechanotransduction. Cellular Signalling, 27(12), 2401-2409. https://doi.org/10.1016/j.cellsig.2015.08.016