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Identification of genes specifically regulated in human melanoma cells

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Abstract

In order to improve the characterization of human malignant melanoma cells and their variant gene expression in vitro, a search for specifically regulated genes was performed. Four melanoma cell lines (M5, MEWO, IGR39, SKMEL13) and newly cultured normal human melanocytes were included in a comparative hybridization (differential screening) of a human melanoma cDNA-library. Six cDNAs were isolated showing a stronger expression (four genes) or a weaker expression (two genes) in melanoma cells than in normal human melanocytes. Quantification of the expression patterns of the two repressed genes in Northern blots revealed general expression in all melanocyte cultures examined, no expression in three cell lines (M5, IGR39, SKMEL13) and weak expression in MEWO. The four induced genes were found to be only weakly expressed in normal human melanocytes, but showed an elevated expression in all of the four melanoma cell lines tested. Thus, using the technique of differential screening, consistent gene regulation at the messenger RNA level was identified, which distinguishes the four melanoma cell lines tested from normal melanocytes. We conclude from the expression patterns that specific gene regulation in melanoma cells in vitro is characterized both by strong repression of some melanocyte genes, as well as by the induction of other genes, but there was no indication of new expression of genes specific for melanoma cells. Because of the uniform induction or repression in different melanoma cell lines, it is conceivable that the cloned genes may be involved in the malignant transformation of melanocytic cells.

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Eberle, J., Garbe, C. & Orfanos, C.E. Identification of genes specifically regulated in human melanoma cells. Arch Dermatol Res 287, 421–427 (1995). https://doi.org/10.1007/BF00373422

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