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Melanoma Development and Pigment Cell Transformation

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Book cover From Melanocytes to Melanoma
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Abstract

The unique nature of a melanocyte is based on its capacity to respond to ultraviolet (UV) radiation with the production of melanin-containing melanosomes, which subsequently are transferred to adjacent keratinocytes to deliver a protective shield. Besides the specific expression of some melanogenesis-related genes, a melanocyte is equipped with an elevated level of antiapoptotic activities, which seems to enhance the threshold for UV-induced apoptosis in this cell type. A further response to UV exposure of the skin is the induction of mitogenic activities and a subsequent increase in the number of melanocytes, which is reflected in the existence of acquired nevi. Melanocytes originate from cells with a high migratory activity and they can react to UV radiation by migration into deeper dermal layers of the skin. Thus, because antiapoptotic, mitogenic, and migratory activities can easily be induced in a melanocyte, it is a sensitive target for factors disturbing its physiological homeostasis and it might also explain why the transformation of melanocytes leads to such highly aggressive tumor cells.

The coordinated balance of differentiation, proliferation, and apoptosis is a prerequisite for the maintenance of cellular homeostasis. Understanding the signaling pathways and molecules involved in the regulation of melanocyte biology and finding the factors that lead to deregulation and ultimately to the transformation of a pigment cell will help in understanding melanoma development. Today, more and more pigment cell-specific-signaling pathways, whose relevance is also reflected in the genetics of melanoma, have been discovered. In the following chapter, some of the signaling pathways that are important for physiological processes in melanocytes, a nd which have been shown to be deregulated in melanoma cells, are discussed.

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© 2006 Humana Press Inc., Totowa, N.J.

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Wellbrock, C. (2006). Melanoma Development and Pigment Cell Transformation. In: Hearing, V.J., Leong, S.P.L. (eds) From Melanocytes to Melanoma. Humana Press. https://doi.org/10.1007/978-1-59259-994-3_14

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  • DOI: https://doi.org/10.1007/978-1-59259-994-3_14

  • Publisher Name: Humana Press

  • Print ISBN: 978-1-58829-459-3

  • Online ISBN: 978-1-59259-994-3

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