Curcumin sensitizes non-small cell lung cancer cell anoikis through reactive oxygen species-mediated Bcl-2 downregulation

Apoptosis : an International Journal on Programmed Cell Death
Varisa PongrakhananonPithi Chanvorachote

Abstract

Anoikis, an apoptosis triggered by loss of cell anchorage, has been shown to be a principal mechanism of inhibition of tumor metastasis. Recently, anti-apoptotic Bcl-2 and Cav-1 proteins have been demonstrated to be highly associated with tumor metastasis and apoptosis resistance. Curcumin, a major active component of turmeric, Curcuma longa, has been shown to inhibit neoplastic evolution and tumor progression; however, the underlying mechanisms are unclear. In this study, we investigated the effect of curcumin on cell anoikis as a possible mechanism of anti-tumorigenic action of curcumin, and evaluated the potential role of Bcl-2 and Cav-1 in this process. Our results showed that ectopic expression of either Bcl-2 or Cav-1 induced anoikis resistance of lung carcinoma H460 cells. Curcumin downregulated Bcl-2 protein during anoikis and sensitized the cells to detachment-induced apoptosis, whereas it had no significant effect on Cav-1 protein expression. Bcl-2 down-regulation as well as anoikis enhancement by curcumin were inhibited by superoxide anion scavenger, Mn(III)tetrakis(4-benzoic acid) porphyrin chloride, but were unaffected by other ROS scavengers including catalase and deferoxamine, suggesting that superoxide anion is ...Continue Reading

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