L-KYN and KYNA were obtained from Sigma Aldrich (St. Louis, MO, USA). L-KYN was dissolved in cell culture medium, whereas KYNA was dissolved in 1 N NaOH, and then phosphate buffered saline (PBS). FICZ, obtained from Tocris Bioscience (Bristol, UK), was dissolved in dimethyl sulfoxide (DMSO). The final concentration of DMSO in cell culture medium dilutions was less than 0.2%. No significant effects of solvents on melanoma and melanocyte cell proliferation and morphology were observed.
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