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Rottlerin inhibits the nuclear factor kappaB/cyclin-D1 cascade in MCF-7 breast cancer cells

C Torricelli1, V Fortino, E Capurro

  • 1Department of Physiology, University of Siena, via Aldo Moro, 7-53100 Siena, Italy. torricellic@unisi.it

Life Sciences
|February 12, 2008
PubMed

Insights

Rottlerin inhibits cancer cell proliferation by blocking NF-kappaB activation, independent of protein kinase C (PKC). This leads to decreased cyclin-D1 expression, suggesting a novel therapeutic target for cancer growth arrest.

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • Protein Kinase C (PKC) activation by phorbol 12-myristate 13-acetate (PMA) is known to induce growth arrest in MCF-7 cells.
  • The specific mechanisms underlying PKC-mediated growth arrest require further elucidation.
  • Rottlerin, a PKCdelta inhibitor, was observed to independently inhibit cell proliferation.

Purpose of the Study:

  • To investigate the antiproliferative effects of Rottlerin in MCF-7 cells.
  • To elucidate the molecular mechanisms by which Rottlerin inhibits cell proliferation.
  • To determine the role of NF-kappaB and cyclin-D1 in Rottlerin-induced growth arrest.

Main Methods:

  • Western blotting analysis of cytoplasmic/nuclear extracts.
  • Analysis of cell-cycle inhibitors (p21, p27) and cyclin-D1 protein and mRNA levels.
  • Investigation of signaling pathways including ERK, Akt, and NF-kappaB.
  • Assessment of Rottlerin's effect on calcium-induced CaMKII autophosphorylation.

Main Results:

  • Rottlerin blocked NF-kappaB activation by reducing phospho-IkappaBalpha and p65 nuclear migration, independent of PKC, Akt, and ERK.
  • Rottlerin caused a significant decrease in cyclin-D1 protein and mRNA levels.
  • The antiproliferative effect was not mediated by p21 or p27.
  • Preliminary data suggest Rottlerin interferes with NF-kappaB via inhibition of CaMKII autophosphorylation.

Conclusions:

  • Rottlerin exhibits antiproliferative activity in MCF-7 cells through a mechanism independent of classical PKC signaling.
  • Rottlerin inhibits cell proliferation by down-regulating cyclin-D1 via NF-kappaB inhibition.
  • The findings suggest a potential role for Rottlerin or related compounds in cancer therapy by targeting the NF-kappaB/cyclin-D1 pathway, possibly through CaMKII.

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