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Related Experiment Videos

Nuclear envelope: nanoarray responsive to aldosterone.

H Oberleithner1

  • 1Nanolab, Institute of Physiology II, University Münster, D-48149, Münster, Germany, oberlei@uni-muenster.de

The Journal of Membrane Biology
|October 1, 2004
PubMed
Summary
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Nuclear pores act as steroid-sensitive gates, regulating nuclear activity by changing conformation and permeability in response to steroid hormones. This process influences nuclear volume and can be modulated by specific drugs.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biophysics

Background:

  • Nuclear pores mediate nucleocytoplasmic transport, acting as sophisticated nanomachines.
  • Steroid hormones are key regulators of nuclear pore function, influencing ion conductivity and macromolecule permeability.
  • Nuclear pore complex (NPC) conformation and transport are cargo-dependent.

Purpose of the Study:

  • To investigate the role of steroid hormones in regulating nuclear pore complex (NPC) structure and function.
  • To explore the impact of steroid-induced transport on nuclear envelope permeability and volume.
  • To identify potential therapeutic targets for modulating steroid hormone action at the nuclear level.

Main Methods:

  • Atomic force microscopy (AFM) for nanoscale imaging of NPC conformational changes.

Related Experiment Videos

  • Measurement of osmotic water movements and nuclear swelling in response to steroid hormones.
  • Pharmacological inhibition of steroid-induced effects using spironolactone and amiloride.

    • Main Results:

    • Aldosterone induces significant conformational changes in nuclear pores, dependent on transported cargo.
    • Steroid-induced macromolecule transport leads to osmotic water influx and nuclear swelling.
    • Spironolactone and amiloride effectively inhibit steroid-induced nuclear swelling.
    • Prevention of nuclear volume changes blocks steroid hormone action.

    Conclusions:

    • Nuclear pores function as steroid-sensitive gates controlling nuclear activity.
    • NPCs dynamically adapt their conformation and permeability in response to steroid hormones.
    • Targeting nuclear pores or associated pathways offers a strategy to modulate steroid hormone effects.