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Related Experiment Videos

STAT3 activation accompanies keratinocyte differentiation

P J Hauser1, D Agrawal, J Hackney

  • 1Department of Cell Biology, Vanderbilt University, Nashville, Tennessee 37240, USA.

Cell Growth & Differentiation : the Molecular Biology Journal of the American Association for Cancer Research
|October 28, 1998
PubMed
Summary

Signal transducers and activators of transcription 3 (STAT3) activation is crucial for keratinocyte differentiation and cell cycle exit. Its regulation is linked to cell cycle machinery, specifically p27kip1, impacting differentiation markers.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Signal transducers and activators of transcription (STAT) factors regulate cell differentiation and cell cycle.
  • STAT3 plays roles in various cell types during differentiation and cell cycle exit.

Purpose of the Study:

  • To investigate STAT3 activation during growth arrest and differentiation in primary murine keratinocytes.
  • To explore the relationship between STAT3 activation and the cell cycle machinery, particularly p27kip1.

Main Methods:

  • Studied STAT3 DNA binding activity in quiescent and mitogenically stimulated keratinocytes.
  • Examined STAT3 activity in keratinocytes induced to differentiate by suspension culturing.
  • Investigated the role of p27kip1 in STAT3 activation using antisense oligonucleotides and p27kip1-deficient keratinocytes.

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Main Results:

  • STAT3 activation was detected in quiescent keratinocytes, down-regulated by mitogens, and reaccumulated during re-quiescence.
  • STAT3 activity was induced by suspension culturing, which promotes keratinocyte differentiation.
  • STAT3 induction was absent in immortalized MK cells that do not differentiate.
  • Inhibition of p27kip1 accumulation led to loss of STAT3 activation and delayed keratinocyte differentiation.

Conclusions:

  • STAT3 activation is tightly linked to keratinocyte growth status and cell cycle withdrawal.
  • Alterations in the cell cycle machinery, specifically involving p27kip1, are necessary for proper STAT3 up-regulation during keratinocyte differentiation.
  • STAT3 activity is a key regulator of keratinocyte differentiation, influenced by cell cycle events.