Solar-Simulated Ultraviolet Radiation-Induced Upregulation of the Melanocortin-1 Receptor, Proopiomelanocortin, and α-Melanocyte-Stimulating Hormone in.

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Solar-Simulated Ultraviolet Radiation-Induced Upregulation of the Melanocortin-1 Receptor, Proopiomelanocortin, and α-Melanocyte-Stimulating Hormone in Human Epidermis In Vivo André Rougier Journal of Investigative Dermatology Volume 122, Issue 2, Pages 468-476 (February 2004) DOI: 10.1046/j.0022-202X.2004.22239.x Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Upregulation of MC-1R, POMC, and IL-10 mRNA after UV irradiation in vivo. The volar aspects of the forearm of five healthy volunteers were left unirradiated (control) or were irradiated with 2×MED using a solar simulator. Suction blisters were induced 3 h or 6 h after irradiation, and total RNA from epidermal roofs was subjected to reverse transcriptase–PCR. (a) Amplification products of MC-1R, POMC, IL-10, and β-actin were separated on agarose gels, and (b) evaluated densitometrically to semiquantify mRNA expression. Results are expressed as β-actin normalized relative mRNA levels (mean±SD) of five different experiments. *p<0.05 versus control. The absence of superscript means the differences were not statistically significant. Journal of Investigative Dermatology 2004 122, 468-476DOI: (10.1046/j.0022-202X.2004.22239.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Broad-spectrum sunscreen prevents upregulation of POMC and IL-10 mRNA after UV irradiation in vivo. The volar aspects of the forearm of three volunteers were left unirradiated (control) or were irradiated with 2×MED using a solar simulator. The irradiated area was either left untreated or treated with Anthélios XL or its common vehicle control. Suction blisters were induced 24 h after irradiation, and total mRNA from epidermal roofs was subjected to reverse transcriptase–PCR. Amplification products of POMC, IL-10, and β-actin were separated on agarose gels. One representative set of data of three different experiments is shown. Journal of Investigative Dermatology 2004 122, 468-476DOI: (10.1046/j.0022-202X.2004.22239.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Upregulated α-MSH and IL-10 levels in suction blister fluid after UV irradiation. Suction blisters were induced 24 h after in vivo UV irradiation of human skin using a solar simulator or were left unirradiated. Suction blister fluids were collected, and (a) α-MSH and (b) IL-10 were determined using a specific radioimmunoassay or enzyme immunoassay, respectively. Results are presented as fold induction (mean±SD) of three individual experiments. p<0.05 (control vs UV vs sunscreen). Journal of Investigative Dermatology 2004 122, 468-476DOI: (10.1046/j.0022-202X.2004.22239.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 UV-induced expression of MC-1R in human epidermis. Suction blisters were induced (b) 24 h after in vivo UV irradiation using a solar simulator or (a) were left nonirradiated, epidermal roofs were isolated, and deparaffinized sections were stained with an antibody against MC-1R. Bound antibodies were detected by the immunoperoxidase technique (red staining). Significant MC-1R immunostaining was observed in the epidermis (E) only after UV irradiation (arrows; b) but not in nonirradiated epidermis (a). However, MC-1R immunoreactivity was occasionally detected in scattered dendritic cells (a, large arrowheads), which were identified as Langerhans cells by CD1 immunostaining (not shown). Scale bar=25 μm. Journal of Investigative Dermatology 2004 122, 468-476DOI: (10.1046/j.0022-202X.2004.22239.x) Copyright © 2004 The Society for Investigative Dermatology, Inc Terms and Conditions