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Related Experiment Videos

Steroids dilate nuclear pores imaged with atomic force microscopy.

Victor Shahin1, Lars Albermann, Hermann Schillers

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

Journal of Cellular Physiology
|August 19, 2004
PubMed
Summary

Dexamethasone (dex) triggers nuclear pore complex (NPC) dilation before molecules enter the cell nucleus. This conformational change, visualized by atomic force microscopy, impacts therapeutic macromolecule delivery.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Nanotechnology

Background:

  • The nuclear envelope (NE) regulates transport into the cell nucleus via nuclear pore complexes (NPCs).
  • Macromolecules require mechanisms to navigate the NE barrier for nuclear functions.
  • Dexamethasone (dex) is a synthetic steroid that activates glucocorticoid receptors, initiating nuclear signaling.

Purpose of the Study:

  • To visualize and understand the initial steps of macromolecule translocation across the nuclear envelope.
  • To investigate the role of dexamethasone in initiating protein targeting to NPCs.
  • To elucidate the conformational changes of NPCs during the early stages of nuclear import.

Main Methods:

  • Utilized atomic force microscopy (AFM) for high-resolution visualization of the nuclear envelope surface.

Related Experiment Videos

  • Applied a nanotechnical approach to observe single-molecule interactions.
  • Injected dexamethasone into Xenopus laevis oocytes and isolated cell nuclei at specific time points (90 and 180 seconds) post-injection.

    • Main Results:

    • Dexamethasone-initiated proteins (DIPs) initially bind to NPC-free regions of the outer nuclear membrane.
    • NPCs undergo dilation upon DIPs binding, preceding direct attachment to the pores.
    • RU486, a glucocorticoid receptor antagonist, blocked DIPs accumulation and NPC conformational changes, confirming the pathway's specificity.

    Conclusions:

    • Dexamethasone exposure induces NPC dilation, indicating a conformational change occurs before transport.
    • NPC dilation is likely mediated by associated filaments or other structures within the outer nuclear membrane.
    • NPC dilation may significantly influence the nuclear targeting of therapeutic macromolecules, offering potential for drug delivery strategies.