Abstract
In order to characterise the distribution and role of stem cell factor (SCF), a recently-reported growth factor for normal melanocytes, we carried out an immunohistochemical study on benign and malignant melanocytic tumours with a comparison with the presence of its receptor c-Kit proto-oncogene product (c-KIT). In normal skin, SCF was mainly observed in endothelial cells of blood vessels but not frequently in basal melanocytes, whereas c-KIT was predominantly localised in tissue mast cells. In benign neoplastic melanocytes (common melanocytic naevi), localisation of SCF and c-KIT was complementary: SCF was mostly found in dermal naevus cells while c-KIT was revealed in epidermal naevus cells, although the expression of the latter antigen was not frequent. Malignant melanoma cells showed less frequent expression of these antigens than those in benign lesions. Of five cultured melanoma cell lines, SCF was observed in only one, and c-KIT was not found in any melanoma cells. No quantitative or qualitative alterations assessed by Western blot analysis were induced in the presence of phenotypic modifiers (sodium butyrate and HMBA). Present data suggest that loss of SCF expression in neoplastic melanocytes is commonly associated with malignant transformation of pigment cells rather than loss of its receptor c-KIT.
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Takahashi, H., Saitoh, K., Kishi, H. et al. Immunohistochemical localisation of stem cell factor (SCF) with comparison of its receptor c-Kit proto-oncogene product (c-KIT) in melanocytic tumours. Vichows Archiv A Pathol Anat 427, 283–288 (1995). https://doi.org/10.1007/BF00203396
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DOI: https://doi.org/10.1007/BF00203396