This anti-proliferative 3, 3- (3, 5-DCPBC) effect corresponds to an average of the relative fluorescence of 1 1, compared to 4.9 of the DMSO control at the same time point (Figure 3a). (EGFR), proto-oncogene cellular sarcoma (c-SRC) and simultaneously suppressed phosphorylation of key downstream effectors and signaling pathways known to enforce melanoma progression. We also uncovered the non-toxic nature of this compound against human melanocytes, the benign counterpart of malignant melanoma cells. In aggregate, we here report for the first time a novel anti-melanoma drug candidate that not only suppresses cellular functions, key for melanoma progression but simultaneously targets multiple phosphor-tyrosine kinases. This is a clinically relevant advancement, and thus 3, 3- (3, 5-DCPBC) may hold the unique therapeutic potential to be further tested in preclinical Rabbit polyclonal to ZAP70 and clinical studies. 2. Results 2.1. 3, 3-(3, 5-DCPBC) Induceds Cytotoxicity in Metastatic and Non-Metastatic Melanoma Cells 3, 3- (3, 5-DCPBC) was synthesized using two molecules of 4-hydroxy coumarin and 3, 5-dichlorbenzaldehyde in a condensation reaction [30,31], as shown in Figure 1a. Cytotoxicity of 3, 3- (3, 5-DCPBC) was further assessed employing the MTT assay, where the activity of NADPH oxidoreductase served as a measure for the extent of cellular toxicity. The results were compared with the optical density determined for non-treated control cells (20% FBS DMEM) or dimethyl sulfoxide (DMSO). We found a concentration and time-dependent increase in cytotoxicity in A375 melanoma cells upon treatment with 3, 3- (3, 5-DCPBC) (Figure 1b,c). While 90% of A375 melanoma cells were viable after incubation with 0.1 M of 3, 3- (3, 5-DCPBC) for 24 h, it depicts cytotoxicity of more than 50% of melanoma cells upon incubation at concentrations of 1 Estramustine phosphate sodium 1, 10, and 100 M for 24 h (Figure 1b). Cytotoxicity studies of 3, 3- (3, 5-DCPBC) on WM-115 and metastatic SK-MEL-28 melanoma cells show similar results (Figure 1d,e). Open in a separate window Figure 1 Synthesis of 3, 3- (3, 5-DCPBC) and its cytotoxic effects on different melanoma cells. (a) Scheme depicting the synthesis of 3, 3- (3, 5-DCPBC) using 3, 5-dichlrobenzaldehyde with 4-hydroxy coumarin in the presence of tetra ethyl ammonium bromide (TEAB). (bCh) Cytotoxic effect of 3, 3- (3, 5-DCPBC) on metastatic melanoma cells, non-metastatic melanoma cells, primary melanocytes, the benign counterpart of melanoma cells, and fibroblasts at the indicated concentrations (0.1, 1 M and 10 M) and time point (12 and 24 h). M2 medium for melanocytes and DMEM for fibroblasts served as controls (g,h). An equal concentration of DMSO dissolved in growth media for melanocytes (M2) and fibroblasts (DMEM) was used as DMSO controls (g,h). Data are presented as a percentage of control (= 3) S. D. DMSO, Estramustine phosphate sodium Dimethyl sulfoxide. To explore the specificity of 3, 3- (3, 5-DCPBC) for its cytotoxicity on melanoma cells, the cytotoxicity of 3, 3- (3, 5-DCPBC) was further assessed on human melanocytes (NHEM) and fibroblasts (FF95). Of note, 3, 3- (3, 5-DCPBC) did not show any cytotoxicity on human melanocytes (NHEM) and fibroblast (FF95) at 12 and 24 h (Figure 1g,h). 2.2. 3, 3- (3, 5-DCPBC) Inhibits the Migration of Melanoma Cells Since cell migration is critical in cancer and melanoma progression [32,33], inhibition of melanoma cell migration is of prime importance. Multi-chamber Transwell? migration assays were employed to assess the effect of 3, 3- (3, 5-DCPBC) on random and directed migration of metastatic Estramustine phosphate sodium melanoma (A375, SK-MEL-28) and non-metastatic melanoma (WM-115) cells. The suppressive effect of 3, 3- (3, 5-DCPBC) was first tested at three concentrations (0.1, 1, and 10 M) for 4 h on the directed migration of A375 melanoma cells. Of note, 3, 3- (3, 5-DCPBC) effectively suppressed the directed migration of A375 melanoma cells at all concentrations in a dose-dependent manner (Figure 2a). Type-IV collagen and 20% FBS served as strong chemoattractants (positive controls). 3, 3- (3, 5-DCPBC) impressively inhibited directed A375 melanoma cell migration induced by Estramustine phosphate sodium 20% FBS (Figure 2a,b). Of note, 3, 3- (3, 5-DCPBC) suppressed A375 melanoma cell migration by 93.1% at a concentration of 1 1 M compared to the control (Figure 2a, middle panel). Representative photomicrographs of the bottom side of the perforated membranes confirm these results (Figure 2b). These data imply that.