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Related Experiment Videos

Ion channel are sensitive to gravity changes.

M Goldermann1, W Hanke

  • 1Institute for Physiology, Dept. of Membrane Physiology, University of Hohenheim, Stuttgard, Germany.

Microgravity Science and Technology
|June 5, 2002
PubMed
Summary
This summary is machine-generated.

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Gravity directly impacts ion channel function in cell membranes. Changes in gravity altered the open state probability of porins, suggesting a mechanism for how cells sense gravity.

Area of Science:

  • Biophysics
  • Cell Biology
  • Gravitational Biology

Background:

  • Living systems exhibit sensitivity to gravity changes, even at the cellular level.
  • The precise mechanisms by which cells detect and respond to gravity are not fully understood.
  • Potential gravity detection mechanisms involve the cell membrane or integral membrane proteins.

Purpose of the Study:

  • To investigate the direct influence of gravity on ion channels within lipid bilayers.
  • To explore how gravity affects the membrane-ion channel complex.
  • To provide insights into gravity's effects on biological systems.

Main Methods:

  • Investigated alamethicin doped planar lipid bilayers under varying gravity conditions.
  • Studied reconstituted porins from Escherichia coli outer membrane.

Related Experiment Videos

  • Measured the open state probability of ion channels (porins) in planar lipid bilayers.

    • Main Results:

    • Gravity was found to directly influence the integral open state probability of native ion channels (porins).
    • Hypergravity (increased gravity) increased porin open state probability.
    • Microgravity (reduced gravity) decreased porin open state probability.
    • The gravity-gated effect on porins showed a sigmoidal dependency, with the steepest change between 1 and 1.3 g.

    Conclusions:

    • Gravity exerts a direct influence on the function of ion channels embedded in cell membranes.
    • The observed effects suggest a general role for gravity in modulating membrane and ion channel activity.
    • This provides a potential biophysical explanation for gravity's impact on various biological processes in living organisms.