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Eumelanin and pheomelanin concentrations in human epidermis before and after UVB irradiation

Lookup NU author(s): Emeritus Professor Brian Diffey

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Abstract

Pheomelanin is widely thought to be causally related to susceptibility to the harmful effects of ultraviolet radiation: epidemiological studies show that those with a higher ratio of pheomelanin to eumelanin in hair have higher rates of melanoma, and work in mouse and cell culture shows that pheomelanin generates excess free radicals after UVR exposure. By contrast, based on measurements of eumelanin and pheomelanin in human skin, before and following irradiation, we now report that both pheomelanin and eumelanin are positively related to skin colour, and by inference, inversely with cancer susceptibility. The ratio of melanin classes is similar in people with widely different cancer rates and UVR sensitivity. Although our numbers are small, our results extend previous work in man, and lead us to speculate that factors other than the amount of pheomelanin may be important in determining UVR susceptibility in persons with red hair.

Publication metadata

Author(s): Hennessy A, Oh C, Diffey B, Wakamatsu K, Ito S, Rees J

Publication type: Article

Publication status: Published

Journal: Pigment Cell & Melanoma Research

Year: 2005

Volume: 18

Issue: 3

Pages: 220-223

ISSN (print): 1755-1471

ISSN (electronic): 1755-148X

Publisher: Wiley-Blackwell Publishing, Inc.

URL: http://dx.doi.org/10.1111/j.1600-0749.2005.00233.x

DOI: 10.1111/j.1600-0749.2005.00233.x

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