Plumbagin, a naphthaquinone derivative induces apoptosis in BRCA 1/2 defective castrate resistant prostate cancer cells as well as prostate cancer stem-like cells

Eventhough the role of BRCA1/2 in hereditary prostatic cancer is being unleashed at a rapid rate; their optimal clinical management remains undefined. Cancer stem cells are thought to be responsible for cancer chemoresistance and relapse, thus they represent a significant concern for cancer prognosis and therapy. In this study, we have analyzed the effect of Plumbagin (PB) and structurally related naphthaquinones on BRCA1/2 silenced prostate cancer cells and the ability of PB to target stem cells. Our cell proliferation studies showed that both PC-3 and DU145 cells were more sensitive to PB, though all the compounds induced mitochondrial potential loss, DNA fragmentation and morphological changes which are indicative of apoptosis. Both BRCA1/2 siRNA transfected PC-3 and DU145 cells exhibited increased sensitivity to PB. Gene expression profiling post PB treatment in BRCA1/2 silenced cells revealed that PB has a putative role in tumor suppression in BRCA defective cancers. Using flow cytometric analysis we have proved that PB has the putative ability to directly target CSCs. Overall studies suggest that PB’s antitumour mechanisms holds promise for novel therapeutic approaches against BRCA mutated cancers as well as CSCs.

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