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Cyclin D1 and cyclin D3 show divergent responses to distinct mitogenic stimulation

Alexandra A Anderson1, Emma S Child, Aarathi Prasad

  • 1Division of Cell and Molecular Biology, Imperial College London, London, UK.

Journal of Cellular Physiology
|May 12, 2010
PubMed

Insights

Stimulating cell growth with different compounds causes distinct changes in D-type cyclins. Phorbol esters boost cyclin D1 via MAPK, while forskolin increases cyclin D3 through mTor, impacting cell cycle regulation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • D-type cyclins and their associated cyclin-dependent kinases (cdks) are key regulators of cell cycle progression.
  • Understanding the precise regulation of D-type cyclins is crucial for comprehending cell proliferation and its dysregulation in diseases like cancer.

Purpose of the Study:

  • To investigate the differential effects of phorbol esters and forskolin on the expression, localization, and activation of cyclin D1 and cyclin D3.
  • To elucidate the signaling pathways (MAPK, PKA, mTor) involved in these distinct cellular responses.

Main Methods:

  • Utilized Swiss 3T3 cells to study mitogenesis induction.
  • Applied phorbol esters and forskolin to stimulate distinct signaling pathways.
  • Analyzed changes in protein levels, localization, and activation states of cyclin D1 and cyclin D3.
  • Investigated the roles of MAPK, cAMP-dependent protein kinase A (PKA), and mTor signaling.

Main Results:

  • Phorbol ester stimulation (via protein kinase C) induced S phase entry, dependent on MAPK activation, and increased cyclin D1 levels and activation.
  • Forskolin stimulation (via PKA) induced mitogenesis independent of MAPK but dependent on mTor, specifically increasing cyclin D3 levels and activation.
  • Demonstrated divergent regulation of cyclin D1 and cyclin D3 in response to different mitogenic stimuli.

Conclusions:

  • Cell cycle regulation by D-type cyclins is more complex than previously understood, with distinct stimuli eliciting specific cyclin responses.
  • The differential regulation of cyclin D1 and cyclin D3 by specific signaling pathways offers potential therapeutic targets in cancers characterized by D-cyclin overexpression.

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