Melatonin receptors in human uveal melanocytes and melanoma cells

Previous work has demonstrated that melatonin inhibits growth of cultured human uveal melanoma cells. The goal of this study was to determine the expression of mRNA encoding the melatonin receptor subtypes and the effect of specific melatonin receptor agonists on cell growth of uveal melanoma cells and melanocytes. RNA expression of the human melatonin Mel 1a and Mel 1b receptor subtypes was determined by reverse transcription‐polymerase chain reaction (RT‐PCR) amplification of RNA isolated from two melanoma cell lines and from one cell line of normal melanocytes. PCR‐amplified cDNA encoding the Mel 1b melatonin receptor subtype, but not the Mel 1a subtype, was detected in reverse‐transcribed RNA obtained from both normal uveal melanocytes and melanoma cell lines. Uveal melanoma cells and melanocytes were cultured for 24 hr, then melatonin or one of its membrane receptor agonists, 6‐chloromelatonin (Mel 1a–1b ) or S‐20098 (Mel 1b ) or its putative nuclear agonist, CGP‐52608 (Mel 2 ), was added to the medium. After 5 days, the cells were detached, counted, and compared to untreated controls. Melatonin and its membrane receptor agonists (Mel 1a–1b and Mel 1b ), but not its putative nuclear receptor agonist (Mel 2 ), inhibited the growth of uveal melanoma cells, but not normal melanocytes, at very low concentrations. In uveal melanoma cells, the expression of RNA encoding the Mel 1b receptor suggests that the growth inhibiting effect of melatonin on uveal melanoma cells is related to activation of the melatonin Mel 1b membrane receptor. Furthermore, the expression of RNA encoding melatonin receptors in normal uveal melanocytes suggests that melatonin may play a role in the function of these cells.