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Geraniol (1), olivetol (2), cannabinoids (3 and 4) and 5-fluorou.a.il (5). were tested for their growth inhibitory effects against SK-MEL-3 cell lines using two different 3-(4,5-dimethylthiazol- 2yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) assay and sulforhodamine B protein (SRB) assay. These compounds showed inhibitory activity in vitro in the micromolar range against SK-MEL-3 cell lines. In general, the antitumor activity of these compounds (1, 2, 3, 4 and 5) was in a dose-dependent over the micromolar concentration range . The comparison of values of these compounds in tumor cell lines shows that their susceptibility to these compounds decrease in the following order : OLVTL > CBG > CBD > 5-FU > CRNL in MTT assay, CBG > OLVTL > CBD > GRNL > 5-FU in SRB assay. Cannabinoids (3 and 4) and 5-fluorouracil (5) were tested for their cytotoxic effects on NIH 373 fibroblasts using two different MTT assay and SRB assay. These compounds exhibited potent cytotoxic activities in vitro in the micromolar range against NIH 373 fibroblasts. In general, the cytotoxic activities of these compounds (3, 4 and 5) were in a dose-dependent over the micromolar concentration range . The comparison of values of these compounds on NIH 373 fibroblasts shows that their susceptibility to these compounds decrease on the following order ; CBD > 5-FU > CBG in MTT assay and SRB assay. Cannabigerol (3) was shown the least cytotoxic activity on NIH 373 fibroblasts. Cannabigerol (3) exhibited the most growth-inhibitory activity against SK-MEL-3 cell lines.
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