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Induction of G1 phase arrest and apoptosis in MDA-MB-231 breast cancer cells by troglitazone, a synthetic peroxisome proliferator-activated receptor γ (PPARγ) ligand
- Induction of G1 phase arrest and apoptosis in MDA-MB-231 breast cancer cells by troglitazone, a synthetic peroxisome proliferator-activated receptor γ (PPARγ) ligand
- Yu H.-N.; Lee Y.-R.; Noh E.-M.; Lee K.-S.; Kim J.-S.; Song E.-K.; Han M.-K.; Lee Y.-C.; Kwon K.-B.; Lee S.-J.; Youn H.J.; Jung S.H.
- Ewha Authors
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- Cell Biology International
- vol. 32, no. 8, pp. 906 - 912
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- Peroxisome proliferator-activated receptor γ (PPARγ) ligands inhibit cell proliferation and induce apoptosis in cancer cells. Here we wished to determine whether the PPARγ ligand induces apoptosis and cell cycle arrest of the MDA-MB-231 cell, an estrogen receptor α negative breast cancer cell line. The treatment of MDA-MB-231 cell with PPARγ ligands was shown to induce inhibition of cell growth in a dose-dependent manner as determined by MTT assay. Cell cycle analysis showed a G1 arrest in MDA-MB-231 cells exposed to troglitazone. An apoptotic effect by troglitazone demonstrated that apoptotic cells elevated by 2.5-fold from the control level at 10 μM, to 3.1-fold at 50 μM and to 3.5-fold at 75 μM. Moreover, troglitazone treatment, applied in a dose-dependent manner, caused a marked decrease in pRb, cyclin D1, cyclin D2, cyclin D3, Cdk2, Cdk4 and Cdk6 expression as well as a significant increase in p21 and p27 expression. These results indicate that troglitazone causes growth inhibition, G1 arrest and apoptotic death of MDA-MB-231 cells. © 2008 International Federation for Cell Biology.
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