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Microgravity and bone cell mechanosensitivity

E H Burger1, J Klein-Nulend

  • 1Department of Oral Cell Biology, ACTA-Vrije Universiteit, Amsterdam, The Netherlands. eh.burger.ocb.acta@med.vu.nl

Bone
|May 26, 1998
PubMed
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Bone cells sense mechanical stress via fluid flow, influencing bone formation. Microgravity may disrupt this mechanosensation, contributing to bone loss in astronauts, warranting further study.

Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Skeletal Physiology

Background:

  • Bone cells, especially osteocytes, are sensitive to mechanical stress, crucial for skeletal adaptation (Wolff's law).
  • Interstitial fluid flow over bone cells is a likely in vivo stressor.
  • Cellular responses to fluid flow involve prostaglandin synthesis and COX-2 expression, mediating bone formation.

Purpose of the Study:

  • To investigate the role of the cytoskeleton in cellular mechanotransduction in bone cells.
  • To explore the potential impact of microgravity on bone cell mechanosensitivity and its contribution to skeletal changes in astronauts.

Main Methods:

  • Studied the response of bone cells in culture to fluid flow.
  • Investigated the effect of disrupting the actin-cytoskeleton on cellular stress response.

Related Experiment Videos

  • Considered the known effects of microgravity on cytoskeletal assembly and bone metabolism.

    • Main Results:

    • Disruption of the actin-cytoskeleton abolished the cellular response to stress, indicating cytoskeletal involvement in mechanotransduction.
    • Microgravity has catabolic effects on bone, potentially due to altered cytoskeletal assembly and mechanosensation.

    Conclusions:

    • The cytoskeleton plays a critical role in bone cell mechanotransduction.
    • Altered mechanosensitivity of bone cells under microgravity may contribute to bone loss in astronauts.
    • In vitro experiments on the International Space Station are proposed to validate these hypotheses.