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Differential Antiproliferative and Apoptotic Response of Sanguinarine for Cancer Cells versus Normal Cells¹

Department of Dermatology [N. A., S. G., M. M. H., H. M.] and Department of Anatomy, School of Medicine [K. M. H.], Case Western Reserve University, Cleveland, Ohio 44106

Sanguinarine, derived from the root of Sanguinaria canadendid, has been shown to possess antimicrobial, anti-inflammatory, and antioxidant properties. Here we compared the antiproliferative and apoptotic potential of sanguinarine against human epidermoid carcinoma (A431) cells and normal human epidermal keratinocytes (NHEKs). Sanguinarine treatment was found to result in a dose-dependent decrease in the viability of A431 cells as well as NHEKs albeit at different levels because sanguinarine-mediated loss of viability occurred at lower doses and was much more pronounced in the A431 carcinoma cells than in the normal keratinocytes. DNA ladder assay demonstrated that compared to vehicle-treated control, sanguinarine treatment of A431 cells resulted in an induction of apoptosis at 1-, 2-, and 5-µM doses. Sanguinarine treatment did not result in the formation of a DNA ladder in NHEKs, even at the very high dose of 10 µM. The induction of apoptosis by sanguinarine was also evident by confocal microscopy after labeling the cells with annexin V. This method also identified necrotic cells, and sanguinarine treatment also resulted in the necrosis of A431 cells. The NHEKs showed exclusively necrotic staining at high doses (2 and 5 µM). We also explored the possibility of cell cycle perturbation by sanguinarine in A431 cells. The DNA cell cycle analysis revealed that sanguinarine treatment did not significantly affect the distribution of cells among the different phases of the cell cycle in A431 cells. We suggest that sanguinarine could be developed as an anticancer drug.

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