Matthias Lüftl, Martin Röcken, Gerd Plewig, Klaus Degitz 

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PUVA Inhibits DNA Replication, but not Gene Transcription at Nonlethal Dosages  Matthias Lüftl, Martin Röcken, Gerd Plewig, Klaus Degitz  Journal of Investigative Dermatology  Volume 111, Issue 3, Pages 399-405 (September 1998) DOI: 10.1046/j.1523-1747.1998.00316.x Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 PUVA inhibits proliferation of HL60 and HaCaT cells. Proliferative activity of HL60 (A) and HaCaT (B) cells 24 h after PUVA measured as [3H]thymidine incorporation as described in Materials and Methods. Results are expressed as percentage of proliferative activity of untreated control cells. One representative out of two (HL60) or four (HaCaT) experiments is shown. Journal of Investigative Dermatology 1998 111, 399-405DOI: (10.1046/j.1523-1747.1998.00316.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 PUVA does not inhibit baseline or induced c-jun mRNA expression. Total cellular RNA was isolated from untreated HL60 cells and from HL60 cells 2 and 6 h after PUVA. Additionally, cells were incubated with 100 ng PMA per ml for 2 and 6 h either as the sole treatment or immediately after PUVA. RNA was electrophoresed and analyzed by northern blot hybridization using a [32P]-labeled c-jun cDNA probe. A PCR product amplified from a glyceraldehyde-3-phosphate dehydrogenase cDNA (GAPDH) is shown as a control for loading uniformity. Lane 1, untreated control cells;lane 2, 500 ng per ml 8-MOP;lane 3, 0.25 J UVA per cm2;lane 4, PUVA (500 ng 8-MOP per ml + 0.05 J UVA per cm2);lane 5, PUVA (500 ng 8-MOP per ml + 0.25 J UVA per cm2);lane 6, PMA;lane 7, PUVA (500 ng 8-MOP per ml + 0.05 J UVA per cm2) + PMA;lane 8, PUVA (500 ng 8-MOP per ml + 0.25 J UVA per cm2) + PMA. Journal of Investigative Dermatology 1998 111, 399-405DOI: (10.1046/j.1523-1747.1998.00316.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 3 PUVA does not inhibit baseline or induced ICAM-1 mRNA expression. (A) Total cellular RNA was isolated from untreated HL60 cells and from treated cells 6 h after PUVA. Additionally, cells were incubated with 100 ng PMA per ml or 100 U IFN-γ per ml immediately after PUVA. RNA was electrophoresed and analyzed by northern blot hybridization using a [32P]-labeled ICAM-1 cDNA probe. A PCR product amplified from a glyceraldehyde-3-phosphate dehydrogenase cDNA (GAPDH) is shown as a control for loading uniformity. Lane 1, untreated control cells;lane 2, 500 ng 8-MOP per ml;lane 3, 0.25 J UVA per cm2;lane 4, PUVA 500 ng 8-MOP per ml + 0.05 J UVA per cm2;lane 5, PUVA 500 ng 8-MOP per ml + 0.25 J UVA per cm2;lane 6, IFN-γ;lane 7, PUVA (500 ng 8-MOP per ml + 0.25 J UVA per cm2) + IFN-γ;lane 8, untreated control cells;lane 9, PMA;lane 10, PUVA (500 ng 8-MOP per ml + 0.25 J UVA per cm2) + PMA. (B) Total cellular RNA was isolated from untreated and from PUVA-treated HaCaT cells 6 h after PUVA. Lanes 1 and 2, untreated control cells;lane 3, PUVA 500 ng 8-MOP per ml + 0.05 J UVA per cm2;lane 4, PUVA (500 ng 8-MOP per ml + 0.25 J UVA per cm2);lane 5, PUVA (500 ng 8-MOP per ml + 1.0 J UVA per cm2);lane 6, IFN-γ;lane 7, PUVA (500 ng 8-MOP per ml + 1.0 J UVA per cm2) + IFN-γ. Journal of Investigative Dermatology 1998 111, 399-405DOI: (10.1046/j.1523-1747.1998.00316.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 4 PUVA does not inhibit baseline and induced ICAM-1 cell surface expression in HaCaT cells. Analysis by immunofluorescence flow cytometry as described under Materials and Methods using an IgG1 isotype control (IGG1) and an anti-ICAM-1 monoclonal antibody (ICAM-1). PUVA conditions were 500 ng 8-MOP per ml and 0.5 J UVA per cm2. (A) Analysis of untreated (CONTROL) and treated (PUVA) cells 24 h after PUVA. (B) Analysis of HaCaT cells treated with 100 U IFN-γ per ml either as the sole treatment (IFN-G) or immediately after PUVA (PUVA + IFN-G). One representative of five experiments is displayed. Journal of Investigative Dermatology 1998 111, 399-405DOI: (10.1046/j.1523-1747.1998.00316.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 5 PUVA does not activate DNA binding of NFκB. (a) Nuclear extracts were prepared as described in Materials and Methods from untreated cells or from cells 1 h after PUVA treatment. Extracts were incubated with a 32P-labeled double-stranded oligonucleotide containing an NFκB or an SP1 consensus motif. Incubation was followed by electrophoresis on a nondenaturing polyacrylamide gel. Specific NFκB-binding complexes are marked by arrows. Experiments with HL60 cells: lane 1, untreated controls;lane 2, PUVA (100 ng 8-MOP per ml + 0.25 J UVA per cm2);lane 3, PUVA (500 ng 8-MOP per ml + 0.5 J UVA per cm2);lane 4, 10 ng TNF-α per ml (incubation for 1 h prior to extraction). Experiments with HaCaT cells: lane 1, untreated controls;lane 2, 500 ng 8-MOP per ml;lane 3, 1.0 J UVA per cm2;lane 4, PUVA (500 ng 8-MOP per ml + 0.5 J UVA per cm2);lane 5, PUVA (500 ng 8-MOP per ml + 1.0 J UVA per cm2);lane 6, 10 ng TNF-α per ml (incubation for 1 h prior to extraction). (b) Competition studies with extracts from HaCaT cells (incubated with 10 ng TNF-α per ml for 1 h prior to extraction). Lane 1, no competition;lane 2, competition with 50 ng of an unlabeled double-stranded oligonucleotide containing an AP1 consensus-binding motif (irrelevant DNA sequence);lane 3, competition with 50 ng of unlabeled identical double-stranded NFκB oligonucleotide;lane 4, competition with 0.5 ng of unlabeled identical double-stranded NFκB oligonucleotide. Specific binding complexes are marked by arrows. Journal of Investigative Dermatology 1998 111, 399-405DOI: (10.1046/j.1523-1747.1998.00316.x) Copyright © 1998 The Society for Investigative Dermatology, Inc Terms and Conditions