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Aldosterone and nuclear volume cycling.

H Oberleithner1, J Reinhardt, H Schillers

  • 1Department of Physiology, University of Münster, Germany. oberlei@uni-muenster.de

Cellular Physiology and Biochemistry : International Journal of Experimental Cellular Physiology, Biochemistry, and Pharmacology
|December 23, 2000
PubMed
Summary

Aldosterone rapidly increases cell nuclear volume, challenging traditional views of hormone action. This nuclear swelling, driven by macromolecule shifts, impacts cell function and blood flow.

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Area of Science:

  • Cell biology
  • Endocrinology
  • Biophysics

Background:

  • Aldosterone's cellular effects were traditionally classified as acute nongenomic (<10 min) and sustained genomic (>10 min).
  • Recent findings suggest this established nomenclature may no longer be accurate.

Purpose of the Study:

  • To investigate the rapid cellular response to aldosterone using advanced microscopy.
  • To re-evaluate the timing and mechanisms of aldosterone's action at the cellular level.

Main Methods:

  • Utilized atomic force microscopy (AFM) to observe living endothelial cells and Xenopus laevis oocytes.
  • Monitored cell and nuclear volume changes in real-time after aldosterone exposure.
  • Visualized intracellular receptor and macromolecule dynamics at the nuclear envelope.

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Main Results:

  • Aldosterone induced a rapid (<10 min) increase in endothelial cell volume, primarily localized to the nucleus.
  • Nuclear swelling reached 15-28% of total cell volume and dissipated within 30 minutes.
  • Observed rapid binding of putative receptors to nuclear pores and subsequent macromolecule translocation (800 kD plugs) within minutes.

Conclusions:

  • Aldosterone's rapid nuclear swelling suggests a re-evaluation of its acute action mechanisms.
  • Steroid-induced nuclear swelling is potentially caused by receptor/transcription factor translocation, initiating gene transcription.
  • Cell volume shifts are linked to macromolecule transport and compensated by plasma membrane transporters and ion channels.