Abstract
Melanocyte cultures were obtained from a modification of the keratinocyte culture system MCDB153. Either promelanocytes or mature melanocytes were selected from epidermal cell primary cultures. Pure subcultures of actively dividing melanocytes of both types were grown in a low-serum medium totally deprived of TPA and cholera toxin called melanocyte growth medium (MGM). Early passaged cells from MGM primary cocultures were similar to normal adult human melanocytes in vivo, exhibiting numerous melanosomes, strong dopa positivity and a high dendricity. The ability of MGM to support melanocyte growth was mainly a consequence of its basic composition, combined with a low serum concentration. Bovine pituitary extract significantly enhanced melanocyte growth. Using complete MGM, in the absence of mitogens and keratinocytes, cell growth was maintained, but the differentiation of melanocytes decreased. The presence of keratinocytes was found to promote melanocyte growth. The coculture system used strongly suggests the action of soluble keratinocyte-derived factors. Keratinocyte contact was necessary to sustain melanocyte dendricity and melanization. Melanization and dendricity behaved mostly as independent features when keratinocyte influence was withheld. Our results underline the essential role of keratinocytes in the regulation of melanocyte growth and differentiation in a physiological culture system.
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Read in part before the European Society for Dermatological Research, Turin, 9–12 June 1990
Supported by grants from Laboratoires Pierre Fabre, Castanet Tolosan, France, Laboratoires Roc, Paris, to A.T.
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Donatien, P., Surlève-Bazeille, J.E., Thody, A.J. et al. Growth and differentiation of normal human melanocytes in a TPA-free, cholera toxin-free, low-serum medium and influence of keratinocytes. Arch Dermatol Res 285, 385–392 (1993). https://doi.org/10.1007/BF00372130
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DOI: https://doi.org/10.1007/BF00372130