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Mechanoregulation of proliferation

Xiaogang Jiang1, Paul F Austin, Robert A Niederhoff

  • 1Division of Urology and Alvin J Siteman Cancer Center, Washington University School of Medicine, St Louis, MO 63110, USA.

Molecular and Cellular Biology
|July 15, 2009
PubMed

Insights

Mechanical tension drives cell proliferation by upregulating Skp2, a key protein degradation regulator. This process involves calcium-NFATc1 signaling, integrating mechanical and growth factor pathways to control cell growth.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cell proliferation is essential for tissue development and repair.
  • Mechanical forces play a crucial role in regulating cellular functions, including proliferation.
  • The integration of mechanical signals with growth factor pathways in cell proliferation remains incompletely understood.

Purpose of the Study:

  • To investigate the role of Skp2 in the smooth muscle proliferative response to mechanical tension.
  • To elucidate the mechanisms by which mechanical tension regulates Skp2.
  • To identify the signaling pathways involved in the mechanoregulation of cell proliferation.

Main Methods:

  • Studied smooth muscle cells under varying mechanical tension.
  • Utilized Western blotting and quantitative PCR to assess Skp2 levels.
  • Employed calcium imaging and chromatin immunoprecipitation assays to investigate NFATc1 activity.
  • Performed gene silencing experiments to determine the necessity of NFATc1 and Skp2.

Main Results:

  • Increased mechanical tension upregulated Skp2 expression in smooth muscle cells.
  • Skp2 upregulation was critical for the proliferative response to mechanical tension.
  • Mechanical tension regulated Skp2 transcription, distinct from growth factor-mediated protein stability.
  • Calcium-regulated transcription factor NFATc1 mediated the effect of mechanical tension on Skp2 transcription.

Conclusions:

  • Skp2 acts as a crucial integration point for mechanical tension and growth factor signals in regulating cell proliferation.
  • The calcium-NFATc1-Skp2 signaling axis is a critical pathway in the mechanoregulation of smooth muscle proliferation.
  • Understanding this pathway offers potential therapeutic targets for diseases involving aberrant cell proliferation.

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