Influence of 17β-Estradiol on 15-Deoxy-Δ12,14 Prostaglandin J2 -Induced Apoptosis in MCF-7 and MDA-MB-231 Cells

  • Yaacob, Nik Soriani (Department of Chemical Pathology, Universiti Sains Malaysia) ;
  • Nasir, Rabail (Department of Chemical Pathology, Universiti Sains Malaysia) ;
  • Norazmi, Mohd Nor (School of Health Sciences, Universiti Sains Malaysia)
  • Published : 2013.11.30


The nuclear receptor, peroxisome proliferator-activated receptor gamma ($PPAR{\gamma}$), is expressed in various cancer cells including breast, prostate, colorectal and cervical examples. An endogenous ligand of $PPAR{\gamma}$, 15-deoxy-${\Delta}^{12,14}$ prostaglandin $J_2$ (PGJ2), is emerging as a potent anticancer agent but the exact mechanism has not been fully elucidated, especially in breast cancer. The present study compared the anticancer effects of PGJ2 on estrogen receptor alpha ($ER{\alpha}$)-positive (MCF-7) and $ER{\alpha}$-negative (MDA-MB-231) human breast cancer cells. Based on the reported signalling cross-talk between $ER{\alpha}$ and $ER{\alpha}$, the effect of the $ER{\alpha}$ ligand, $17{\beta}$-estradiol (E2) on the anticancer activities of PGJ2 in both types of cells was also explored. Here we report that PGJ2 inhibited proliferation of both MCF-7 and MDA-MB-231 cells by inducing apoptotic cell death with active involvement of mitochondria. The presence of E2 potentiated PGJ2-induced apoptosis in MCF-7, but not in MDA-MB-231 cells. The $ER{\alpha}$ antagonist, GW9662, failed to block PGJ2-induced activities but potentiated its effects in MCF-7 cells, instead. Interestingly, GW9662 also proved capable of inducing apoptotic cell death. It can be concluded that E2 enhances $ER{\alpha}$-independent anticancer effects of PGJ2 in the presence of its receptor.


15 deoxy-prostaglandin $J_2$;$17{\beta}$-estradiol;apoptosis;MCF-7;MDA-MB-231;GW9662


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