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Modulation of integrin-linked kinase nucleo-cytoplasmic shuttling by ILKAP and CRM1

Kerry-Ann Nakrieko1, Alisa Vespa, David Mason

  • 1Department of Physiology and Pharmacology and Regulatory Biology and Functional Genomics Research Group, Siebens-Drake Research Institute, University of Western Ontario, London, Ontario, Canada.

Cell Cycle (Georgetown, Tex.)
|July 19, 2008
PubMed

Insights

Integrin-linked kinase (ILK) nuclear import and export regulate epidermal keratinocyte proliferation. ILKAP and CRM1 are key regulators of ILK subcellular localization and activity.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Dermatology

Background:

  • Integrin-linked kinase (ILK) is crucial for cell proliferation, adhesion, and migration.
  • ILK localizes to the cytoplasm, focal adhesions, and cell-cell junctions in epidermal keratinocytes.
  • Understanding ILK's subcellular localization mechanisms is key to its function.

Purpose of the Study:

  • To investigate the mechanisms regulating ILK's subcellular localization.
  • To determine the role of ILK nuclear localization in epidermal keratinocyte proliferation.
  • To identify key regulators of ILK subcellular distribution.

Main Methods:

  • Investigated ILK nuclear import via N-terminal sequences and nuclear pore complexes.
  • Studied ILK nuclear export through a CRM1-dependent pathway.
  • Assessed the effect of ILKAP on ILK export and keratinocyte proliferation.

Main Results:

  • ILK is actively imported into the nucleus via its N-terminus and nuclear pore complexes.
  • CRM1-dependent pathway mediates rapid nuclear export of ILK.
  • ILKAP enhances ILK export, reducing nuclear ILK levels.
  • Nuclear ILK correlates with increased keratinocyte DNA synthesis, inhibited by ILKAP.

Conclusions:

  • ILK subcellular localization is a critical regulator of keratinocyte proliferation.
  • ILKAP and CRM1 are pivotal modulators of ILK subcellular distribution and activity.
  • Targeting ILK localization offers potential therapeutic strategies for keratinocyte-related conditions.

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