Ultraviolet radiation (UVR) has been implicated as a major environmental factor in the pathogenesis of photoaging and skin cancers including melanoma. Hypermelanosis induced by UVR has been previously suggested to associate with melanomageneis, although the role of UVR in the development of melanoma is complicated since melanogenesis may depend on several factors such as skin type, genetic infl...

Melanin in the nail bed in patients with skin type VI has been suggested to afford some protection against photo-onycholysis. We report a case of a 16-year-old male patient with skin type VI with onycholysis following PUVA treatment for hypopigmented mycosis fungoides. Symptoms resolved with the application of topical steroid.

BACKGROUND Allogeneic skin grafts onto C57BL/6 mice are rejected, and the rejected skin is replaced by surrounding skin with black hair. In contrast, syngeneic skin grafts are tolerated, and gray hair grows on the grafts. METHODS To explore the mechanism of gray hair growing on the tolerated skin grafts, we prepared full-thickness skin (2-cm square) autografts, 2 (2 cm + 2 cm) horizontal or v...

Terrestrial solar ultraviolet radiation (UVR) exerts both beneficial and adverse effects on human skin. Epidemiological studies show a lower incidence of skin cancer in people with pigmented skins compared to fair skins. This is attributed to photoprotection by epidermal melanin, as is the poorer vitamin D status of those with darker skins. We summarize a wide range of photobiological responses...

a 3.5 month-old girl was admitted with silvery gray hair, light  colored skin, recurrent diarrhea, chest infections, hepatosplenomegaly, episodes of pancytopenia, and hemophagocytosis in the bone marrow. light microscopy of hair showed characteristic large and irregular clumps of melanin in the middle of hair shaft. peripheral blood smear examination did not show giant granules in granulocytes....

Individualswith darker skin types comprise themajority of the global population. By the year 2050, the United States census data suggest that at least 50% of Americans will represent darker racial ethnic groups. There are myriad cutaneous advantages associated with deeply pigmented skin. The unique photoprotective effects of increased epidermal melanin minimize photodamage and decrease the inci...

We previously developed a quantitative autoradiographic tech nique with special forceps for measuring unscheduled DNA synthesis (UDS) in mouse skin after treatment with ultraviolet light in vivo. By this method, we investigated the relationship between the protective role of melanin and UV-induced DNA repair in black-and-white guinea pigs. Flat areas containing a sharp border between pigmented ...

We previously developed a quantitative autoradiographic technique with special forceps for measuring unscheduled DNA synthesis (UDS) in mouse skin after treatment with ultraviolet light in vivo. By this method, we investigated the relationship between the protective role of melanin and UV-induced DNA repair in black-and-white guinea pigs. Flat areas containing a sharp border between pigmented a...

BACKGROUND Panax ginseng has been used to prolong longevity and is believed to be useful for improving skin complexion. Ginsenosides are the most active components isolated from ginseng, and ginsenoside Rg3 (G-Rg3) in particular has been demonstrated to possess antioxidative, antitumorigenic, and anti-inflammatory properties. The aim of this study was to examine the ability of G-Rg3 to inhibit ...

Resveratrol (1), a naturally occurring stilbene compound, has been suggested as a potential whitening agent with strong inhibitory activity on melanin synthesis. However, the use of resveratrol in cosmetics has been limited due to its chemical instability and poor bioavailability. Therefore, resveratrol derivatives were prepared to improve bioavailability and anti-melanogenesis activity. Nine r...