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Low-Intensity Pulsed Ultrasound Modulates Shear Stress Induced PGHS-2 Expression and PGE2 Synthesis in MLO-Y4 Osteocyte-Like Cells

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Abstract

Fluid shear stress (SS) has been shown to be a prevailing physiological stimulus in the regulation of bone cell metabolism and so are the exogenous biomechanical forces, like ultrasound (US) and vibration. The purpose of this study is to elaborate the interplay of laminar fluid SS with low-intensity pulsed US in the regulation of prostaglandin H synthase 2 (PGHS-2) and prostaglandin E2 (PGE2). Murine long bone osteocyte-like (MLO-Y4) cells were exposed to various regimes of US (1.5 Hz, 30 mW/cm2) and SS (19 dyn/cm2) alone and sequentially. Changes in PGHS-2 gene expression levels were quantified at 3 and 24 h using real-time RT-PCR. PGE2 levels in the culture media were measured using enzyme immunoassay at 3 and 24 h. PGE2 levels significantly increased after exposure to SS for 3 and 24 h by 2.17 ± 0.02 and 5.47 ± 0.42-fold, respectively, compared to control cells. A 20 min US treatment prior to SS significantly increased SS PGE2 levels 2.95 ± 0.18 and 2.90 ± 0.50-fold at 3 and 24 h, respectively. US also significantly increased PGHS-2 mRNA levels in cells exposed to SS. SS caused a 2.74 ± 0.49-fold increase in PGHS-2 mRNA levels at 3 h and a significant 3.70 ± 0.25-fold increase at 24 h relative to control. A 20 min US treatment caused 1.35 ± 0.49 and 2.44 ± 0.82-fold increase in PGHS-2 mRNA levels in cells exposed to SS at 3 and 24 h, respectively. These results indicate that combining US with SS may have a more anabolic benefit for bone tissue than either stimulus alone.

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Acknowledgments

We would like to thank Smith and Nephew for donating Exogen SAFHS 2000 ultrasound devices used in these studies.

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Authors and Affiliations

  1. Burn and Shock Trauma Institute, Department of Surgery, Loyola University Chicago Stritch School of Medicine, 2160 S First Ave, Maywood, IL, 60153, USA

    Vikas Saini

  2. North Shore LIJ Health System, Great Neck, NY, 11021, USA

    Sumita Yadav

  3. Department of Bioengineering, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, 61801, USA

    Susan McCormick

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  1. Vikas Saini
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Correspondence to Vikas Saini.

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Associate Editor Mona Kamal Marei oversaw the review of this article.

This work was conducted at the Cell and Tissue Engineering Laboratories, University of Illinois at Chicago.

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Saini, V., Yadav, S. & McCormick, S. Low-Intensity Pulsed Ultrasound Modulates Shear Stress Induced PGHS-2 Expression and PGE2 Synthesis in MLO-Y4 Osteocyte-Like Cells. Ann Biomed Eng 39, 378–393 (2011). https://doi.org/10.1007/s10439-010-0156-6

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  • DOI: https://doi.org/10.1007/s10439-010-0156-6

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