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The appearance, density and distribution of melanocytes in human embryonic and fetal skin revealed by the anti-melanoma monoclonal antibody, HMB-45

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Summary

The presence, densities, and patterns of distribution of melanocytes in the epidermis of human embryos and fetuses, ranging in age from 40 d to 140 d estimated gestational age (EGA), were studied using the HMB-45 monoclonal antibody that recognizes an antigen in melanoma cells and fetal melanocytes. Immunostained sections of skin and epidermal sheets revealed dendritic melanocytes within the basal or intermediate layers of 50 d EGA and older skin. Melanocytes could not be identified by immunostaining or electron microscopy in younger (40–50 d EGA) epidermis or in cultured epidermal cells from these specimens. However, skin from a 45 d EGA embryo grown in organ culture for 11 d stained positively with HMB-45, suggesting that melanocytes are present at that age either in the epidermis or dermis of the explant. Double-labeling experiments using ATPase and HMB-45 confirmed the specificity of HMB-45 for melanocytes and demonstrated that melanocytes and Langerhans cells are nonoverlapping populations. Melanocytes were present in the embryonic epidermis in relatively high numbers (mean value of ∼1050 cells/mm2); they increased in density to ∼2300 cells/mm2 during the late first trimester and early second trimester, then declined during later stages of development to a density of ∼800 cells/mm2, within the range of values for the newborn child and young adult. Equivalent numbers of melanocytes were recognized by silver staining and with the HMB-45 antibody in an 87 d EGA test sample, indicating that HMB-45 reacted with the total melanocytic population. Melanocytes appeared to be distributed in epidermal sheets in a regular pattern. Statistical tests used to evaluate the randomness of a population revealed a tendency toward a non-random distribution in specimens younger than 80 d EGA, just prior to appendage formation and epidermal stratification into multiple layers, however there was variability in the degree of randomness for any given age. The results of this study have closed the gap in timing between the conclusion of neural crest formation and migration (around 6 weeks) and the appearance of melanocytes in the skin between 40–50 d EGA.

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Authors and Affiliations

  1. Department of Biological Structure, University of Washington School of Medicine, 98195, Seattle, WA, USA

    Karen A. Holbrook, Robert A. Underwood & Hugh Kimball

  2. Department of Medicine (Dermatology), University of Washington School of Medicine, 98195, Seattle, WA, USA

    Karen A. Holbrook

  3. Department of Pathology, St. Louis University, MO, USA

    Arthur M. Vogel

  4. Department of Pathology, University of Washington School of Medicine, 98195, Seattle, WA, USA

    Allen M. Gown

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  1. Karen A. Holbrook
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  2. Robert A. Underwood
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  3. Arthur M. Vogel
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  4. Allen M. Gown
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  5. Hugh Kimball
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Holbrook, K.A., Underwood, R.A., Vogel, A.M. et al. The appearance, density and distribution of melanocytes in human embryonic and fetal skin revealed by the anti-melanoma monoclonal antibody, HMB-45. Anat Embryol 180, 443–455 (1989). https://doi.org/10.1007/BF00305119

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