Peter Schroeder, Juergen Lademann, Maxim E

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Infrared Radiation-Induced Matrix Metalloproteinase in Human Skin: Implications for Protection  Peter Schroeder, Juergen Lademann, Maxim E. Darvin, Helger Stege, Corinna Marks, Susanne Bruhnke, Jean Krutmann  Journal of Investigative Dermatology  Volume 128, Issue 10, Pages 2491-2497 (October 2008) DOI: 10.1038/jid.2008.116 Copyright © 2008 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 IRA radiation increases MMP-1 expression in vivo in human skin. (a) Punch biopsies were taken 24hours after exposure to IRA (360Jcm−2) or sham irradiation from healthy human skin. MMP-1 mRNA expression was analyzed by semi-quantitative real-time PCR. Data are means of two measurements per sample of three volunteers (Table 1, volunteer nos. 1–3). (b) Salt-split skin samples were prepared from punch biopsies obtained from IRA (360Jcm−2) and sham-irradiated human skin 24hours post exposure and analyzed by semi-quantitative real-time PCR for MMP-1 mRNA expression. Data are means of two measurements from two volunteers (Table 1, volunteer nos. 4 and 5). (c) Punch biopsies were taken from IRA (720Jcm−2) and sham-irradiated gluteal skin 48hours after exposure, homogenized, and analyzed for MMP-1 protein by western blotting. Data are from one volunteer (Table 1, volunteer no. 7). (d) Punch biopsies were taken from IRA (720Jcm−2) or sham-irradiated skin 48hours after exposure and salt-split skin samples were prepared for western blot analysis of MMP-1 protein expression. Data represent one of three volunteers (Table 1, volunteer nos. 8–10). (e) Punch biopsies were taken from IRA (360Jcm−2) or sham-treated skin 24hours after exposure. Cryosections were prepared and analyzed by immunohistochemistry for MMP-1 and TIMP-1 protein expression. Data represent one of four volunteers (Table 1, volunteer nos. 11–14). Journal of Investigative Dermatology 2008 128, 2491-2497DOI: (10.1038/jid.2008.116) Copyright © 2008 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 IRA decreases skin antioxidants in vivo. Healthy human volunteers (n=9) were irradiated with 360Jcm−2 IRA or sham-treated. Five minutes and 24hours post exposure, skin antioxidant levels were measured by Raman spectroscopy. Data are means±SEM of nine volunteers. *Significantly different to pretreatment (P<0.05). Journal of Investigative Dermatology 2008 128, 2491-2497DOI: (10.1038/jid.2008.116) Copyright © 2008 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 Inhibition of IRA-induced MMP-1 upregulation in cultured human skin fibroblasts by antioxidants. (a, b) Primary human dermal fibroblasts from three different donors were incubated with no antioxidants (−), 10μM ascorbic acid (Vit C), 1μM α-tocopherol (Vit E), 10μM epigallocatechingallat (EGCG), 100μM (−)-epicatechin (EC), or 100μM phenylpropionic acid for 24hours, exposed to IRA (360Jcm−2) radiation, and incubated with the respective antioxidant for another 24hours. MMP-1 expression was measured by real-time PCR; relative upregulation was defined as upregulation in the absence of antioxidants set to 100%. Data are means±SEM of three independent experiments; average MMP-1 upregulation in the absence of antioxidant was 2.2±0.4-fold. (b) Cells were incubated with the antioxidant mixture at the indicated concentrations and treated as described before. MMP-1 mRNA expression was analyzed 24hours after IRA exposure by real-time PCR. Data are means±SEM of nine independent experiments; average MMP-1 upregulation in the absence of antioxidant was 5.3±1.3-fold. Journal of Investigative Dermatology 2008 128, 2491-2497DOI: (10.1038/jid.2008.116) Copyright © 2008 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 IRA radiation-induced upregulation of MMP-1 can be inhibited in human skin through topical application of antioxidants. Nine healthy volunteers (Table 3) were treated with a topical preparation containing 1% antioxidant mixture 20minutes before irradiation (IRA 720Jcm−2). Twenty-four hours post irradiation, punch biopsies were taken and MMP-1 and TIMP-1 expression was analyzed by real-time PCR. Six volunteers showed significant (>2-fold) IRA-induced upregulation of MMP-1, but not of TIMP-1 mRNA steady-state levels. For these six individuals, the relative increase of the MMP-1/TIMP-1 ratio was calculated based on the increase in MMP-1/TIMP-1 ratio in the absence of antioxidant treatment, which was set as 100%. Data are means±SEM of six volunteers. Journal of Investigative Dermatology 2008 128, 2491-2497DOI: (10.1038/jid.2008.116) Copyright © 2008 The Society for Investigative Dermatology, Inc Terms and Conditions