Melanoma, the most serious yet uncommon type of cancer, originates in melanocytes. Risk factors include UV radiation, genetic factors, tanning lamps and beds. Here, we described the synthesis and selective anti melanoma activity of [3,2-b]indole fused 18β-glycyrrhetinic acid, a derivative of 18β-glycyrrhetinic acid in murine B16F10 and A375 human melanoma cell lines. Among the 14 molecules, GPD-12 showed significant selective cytotoxic activity against A375 and B16F10 cell lines with IC50 of 13.38 μM and 15.20 μM respectively. GPD 12 induced the formation of reactive oxygen species in A375 cells that could trigger oxidative stress mediated cell death as is evident from the increased expression of apoptosis related proteins such as caspase-9 and caspase-3 and the increased ratio of Bax to Bcl2. The results showed that GPD 12 can be used as an effective therapeutic agent against melanoma.
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