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An In Vitro Orbital Flow Model to Study Mechanical Loading Effects on Osteoblasts.

Subburaman Mohan1,2,3, Ritika Surisetty1, Chandrasekhar Kesavan1,2

  • 1Musculoskeletal Disease Center, VA Loma Linda Healthcare System, Loma Linda, CA 92357, USA.

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|September 28, 2024
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Summary

Orbital shaker flow at low frequencies effectively models mechanical loading for osteoblasts, increasing ALP activity and proliferation. This inexpensive in vitro method reveals insights into molecular pathways like mTOR and WNT involved in bone mechanotransduction.

Keywords:
differentiationgene expressionmechanical loadingorbital flowosteoblasts

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Area of Science:

  • Biomechanical Engineering
  • Cell Biology
  • Osteoporosis Research

Background:

  • Orbital shaker flow generates shear stress and oscillatory flow, but its utility for studying mechanical loading in osteoblasts is unclear.
  • Understanding osteoblast mechanotransduction is crucial for bone health and treating bone diseases.

Purpose of the Study:

  • To evaluate the effectiveness of orbital shaker flow as a model for mechanical loading on osteoblasts.
  • To investigate the molecular pathways involved in the osteoblast response to orbital flow-induced mechanical stress.

Main Methods:

  • Primary osteoblasts from mice were subjected to orbital shaking at varying frequencies (0.7, 1.4, 3.3 Hz) and durations (30, 60 min).
  • Alkaline phosphatase (ALP) activity, cell proliferation, and expression of bone formation markers (Osf2, Hif1a, Vegf, Cox2) were measured.
  • The effects of inhibiting key signaling pathways (mTOR, JNK, WNT) on orbital flow-induced responses were assessed.

Main Results:

  • Orbital shaking at 0.7 and 1.4 Hz significantly increased ALP activity and osteoblast proliferation compared to static controls.
  • Lower frequency (0.7 Hz) orbital flow upregulated bone formation markers (Osf2, Hif1a, Vegf, Cox2) by 1.5- to 3-fold.
  • Inhibition of mTOR and WNT signaling pathways reduced orbital flow-induced ALP activity, while JNK inhibition had no effect.

Conclusions:

  • Low-frequency orbital shaker flow is a suitable and cost-effective in vitro model for studying mechanical strain effects on osteoblasts.
  • The study identified mTOR and WNT signaling as key mediators of orbital flow-induced osteoblast differentiation.
  • This model provides valuable insights into the molecular mechanisms underlying bone mechanotransduction.