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Kurz B, Klein B, Berneburg M, Meller S. [Ultraviolet radiation in the pathogenesis of lupus erythematosus]. DERMATOLOGIE (HEIDELBERG, GERMANY) 2024; 75:528-538. [PMID: 38916603 DOI: 10.1007/s00105-024-05369-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/16/2024] [Indexed: 06/26/2024]
Abstract
Photosensitivity represents an increased inflammatory reaction to sunlight, which can be observed particularly in the autoimmune disease lupus erythematosus. Cutaneous lupus erythematosus (CLE) can be provoked by ultraviolet (UV) radiation and can cause both acute, nonscarring and chronic, scarring skin changes. In systemic lupus erythematosus, on the other hand, provocation by UV radiation can lead to flare or progression of systemic involvement. The etiology of lupus erythematosus is multifactorial and includes genetic, epigenetic and immunologic mechanisms. In this review, we address the effect of UV radiation on healthy skin and photosensitive skin using the example of lupus erythematosus. We describe possible mechanisms of UV-triggered immune responses that could offer therapeutic approaches. Currently, photosensitivity can only be prevented by avoiding UV exposure itself. Therefore, it is important to better understand the underlying mechanisms in order to develop strategies to counteract the deleterious effects of photosensitivity.
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Affiliation(s)
- Bernadett Kurz
- Klinik und Poliklinik für Dermatologie, Universität Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Deutschland.
| | - Benjamin Klein
- Division of Rheumatology, Department of Internal Medicine, University of Michigan, Ann Arbor, USA
| | - Mark Berneburg
- Klinik und Poliklinik für Dermatologie, Universität Regensburg, Franz-Josef-Strauß-Allee 11, 93053, Regensburg, Deutschland
| | - Stephan Meller
- Klinik und Poliklinik für Dermatologie, Universität Düsseldorf, Düsseldorf, Deutschland
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Morio KA, Sternowski RH, Zeng E, Brogden KA. Antimicrobial Peptides and Biomarkers Induced by Ultraviolet Irradiation Have the Potential to Reduce Endodontic Inflammation and Facilitate Tissue Healing. Pharmaceutics 2022; 14:pharmaceutics14091979. [PMID: 36145725 PMCID: PMC9503046 DOI: 10.3390/pharmaceutics14091979] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Revised: 09/07/2022] [Accepted: 09/13/2022] [Indexed: 11/20/2022] Open
Abstract
Background: Ultraviolet (UV) irradiation can modulate host immune responses and this approach is a novel application for treating endodontic infections and inflammation in root canals. Methods: A dataset of UV-induced molecules was compiled from a literature search. A subset of this dataset was used to calculate expression log2 ratios of endodontic tissue molecules from HEPM cells and gingival fibroblasts after 255, 405, and 255/405 nm UV irradiation. Both datasets were analyzed using ingenuity pathway analysis (IPA, Qiagen, Germantown, MD, USA). Statistical significance was calculated using Fisher’s exact test and z-scores were calculated for IPA comparison analysis. Results: The dataset of 32 UV-induced molecules contained 9 antimicrobial peptides, 10 cytokines, 6 growth factors, 3 enzymes, 2 transmembrane receptors, and 2 transcription regulators. These molecules were in the IPA canonical pathway annotations for the wound healing signaling pathway (9/32, p = 3.22 × 10−11) and communication between immune cells (6/32, p = 8.74 × 10−11). In the IPA disease and function annotations, the 32 molecules were associated with an antimicrobial response, cell-to-cell signaling and interaction, cellular movement, hematological system development and function, immune cell trafficking, and inflammatory response. In IPA comparison analysis of the 13 molecules, the predicted activation or inhibition of pathways depended upon the cell type exposed, the wavelength of the UV irradiation used, and the time after exposure. Conclusions: UV irradiation activates and inhibits cellular pathways and immune functions. These results suggested that UV irradiation can activate innate and adaptive immune responses, which may supplement endodontic procedures to reduce infection, inflammation, and pain and assist tissues to heal.
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Affiliation(s)
| | | | - Erliang Zeng
- Division of Biostatistics and Computational Biology, College of Dentistry, The University of Iowa, Iowa City, IA 52242, USA
| | - Kim A. Brogden
- College of Dentistry, The University of Iowa, Iowa City, IA 52242, USA
- Correspondence:
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Klein B, Kunz M. Current concepts of photosensitivity in cutaneous lupus erythematosus. Front Med (Lausanne) 2022; 9:939594. [PMID: 36091671 PMCID: PMC9452788 DOI: 10.3389/fmed.2022.939594] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2022] [Accepted: 08/10/2022] [Indexed: 11/16/2022] Open
Abstract
Cutaneous lupus erythematosus (CLE) represents a complex autoimmune disease with a broad phenotypic spectrum ranging from acute to chronic destructive cutaneous lesions. Patients with CLE exhibit high photosensitivity and ultraviolet (UV) irradiation can lead to systemic flares in systemic lupus erythematosus. However, the exact mechanisms how UV irradiation enhances cutaneous inflammation in lupus are not fully understood. Recently, new molecular mechanisms of UV-driven immune responses in CLE were identified, offering potential therapeutic approaches. Especially the induction of type I interferons, central cytokines in lupus pathogenesis which are released by various skin cells, have become the focus of current research. In this review, we describe current pathogenic concepts of photosensitivity in lupus erythematosus, including UV-driven activation of intracellular nucleic acid sensors, cellular cytokine production and immune cell activation. Furthermore, we discuss activated pathways contributing to enhanced apoptosis as well as intracellular translocation of autoantigens thereby promoting CLE upon UV light exposure.
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Estadt SN, Maz MP, Musai J, Kahlenberg JM. Mechanisms of Photosensitivity in Autoimmunity. J Invest Dermatol 2021; 142:849-856. [PMID: 34167786 DOI: 10.1016/j.jid.2021.05.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 05/06/2021] [Accepted: 05/07/2021] [Indexed: 12/11/2022]
Abstract
Aberrant responses to UV light frequently lead to the formation of skin lesions and the activation of systemic inflammation in some autoimmune diseases, especially systemic lupus erythematosus. Whereas the effects of UV light on the skin have been studied for decades, only recently have some of the mechanisms that contribute to abnormal responses to UV light in patients with autoimmune diseases been uncovered. This review will discuss the biology of UV in the epidermis and discuss the abnormal epidermal and inflammatory mechanisms that contribute to photosensitivity. Further research is required to fully understand how to normalize UV-mediated inflammation in patients with autoimmune diseases.
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Affiliation(s)
- Shannon N Estadt
- Division of Rheumatology, Department of Internal Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Graduate Program in Immunology, Medical School, University of Michigan, Ann Arbor, Michigan, USA
| | - Mitra P Maz
- Division of Rheumatology, Department of Internal Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Graduate Program in Immunology, Medical School, University of Michigan, Ann Arbor, Michigan, USA
| | - Jon Musai
- Division of Rheumatology, Department of Internal Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA
| | - J Michelle Kahlenberg
- Division of Rheumatology, Department of Internal Medicine, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA; Department of Dermatology, Michigan Medicine, University of Michigan, Ann Arbor, Michigan, USA.
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5
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Omer SAE, Badi RM, Garelnabi MEM, Altayeb OA, Hussein MO, Fadul EA, Saeed AM. Effects of acute and chronic exposure to natural sunlight and UVB on CD4/CD8 ratio and circulating pro-inflammatory and anti-inflammatory cytokine levels in mice. SCIENTIFIC AFRICAN 2019. [DOI: 10.1016/j.sciaf.2019.e00102] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Abstract
Background: Apoptosis, or programmed cell death, is an essential physiological process that controls cell numbers during physiological processes, and eliminates abnormal cells that can potentially harm an organism. Objective: This review summarizes our current state of knowledge of apoptosis induction in skin by UV radiation. Methods: A review of the literature was undertaken focusing on cell death in the skin secondary to UV radiation. Results: It is evident that a number of apoptotic pathways, both intrinsic and extrinsic, are induced following exposure to damaging UV radiation. Conclusion: Although our understanding of the apoptotic processes is gradually increasing, many important aspects remain obscure. These include interconnections between pathways, wavelength-specific differences and cell type differences.
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Affiliation(s)
- Jeffrey Chow
- Department of Laboratory Medicine and Pathology, 4B1.19 Walter C Mackenzie Health Science Centre, University of Alberta, 8440-112th Street, Edmonton, AB, CanadaT6G 2B7
| | - Victor A. Tron
- Department of Laboratory Medicine and Pathology, 4B1.19 Walter C Mackenzie Health Science Centre, University of Alberta, 8440-112th Street, Edmonton, AB, CanadaT6G 2B7
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Le Clair MZ, Cockburn MG. Tanning bed use and melanoma: Establishing risk and improving prevention interventions. Prev Med Rep 2016; 3:139-44. [PMID: 27419006 PMCID: PMC4929140 DOI: 10.1016/j.pmedr.2015.11.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
PURPOSE Exposure to ultraviolet radiation (UVR) from indoor tanning devices is thought to cause melanoma and other negative health consequences. Despite these findings, the practice of indoor tanning in the United States remains prevalent. In this paper we aim to present a clear discussion of the relationship between indoor tanning and melanoma risk, and to identify potential strategies for effective melanoma prevention by addressing indoor tanning device use. BASIC PROCEDURES We reviewed relevant literature on the risks of indoor tanning, current indoor tanning legislation, and trends in indoor tanning and melanoma incidence. Study was conducted at the University of Southern California, Los Angeles, CA between the years of 2014 and 2015. MAIN FINDINGS Our findings reaffirm the relationship between indoor tanning and melanoma risk, and suggest a widespread public misunderstanding of the negative effects of indoor tanning. PRINCIPAL CONCLUSIONS This review argues for an aggressive initiative to reduce indoor tanning in the United States, to design prevention efforts tailored towards specific high risk groups, and the need to better inform the public of the risks of indoor tanning.
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Affiliation(s)
- Marie Z. Le Clair
- Keck School of Medicine, University of Southern California, 2001 N. Soto St., Los Angeles, CA 90089, USA
| | - Myles G. Cockburn
- Department of Preventive Medicine, Keck School of Medicine, University of Southern California, 2001 N. Soto St., Los Angeles, CA 90089, USA
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Kim EJ, Kim YK, Kim MK, Kim S, Kim JY, Lee DH, Chung JH. UV-induced inhibition of adipokine production in subcutaneous fat aggravates dermal matrix degradation in human skin. Sci Rep 2016; 6:25616. [PMID: 27161953 PMCID: PMC4861907 DOI: 10.1038/srep25616] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2015] [Accepted: 04/20/2016] [Indexed: 12/18/2022] Open
Abstract
Ultraviolet (UV) exposure to the human skin reduces triglycerides contents and lipid synthesis in the subcutaneous (SC) fat. Because adiponectin and leptin are the most abundant adipokines from the SC fat, we aim to investigate how they interact with UV exposure and skin aging. The expressions of adiponectin and leptin were significantly decreased in SC fat of sun-exposed forearm skin, in comparison with that of sun-protected buttock skin of the same elderly individuals, indicating that chronic UV exposure decreases both adipokines. Acute UV irradiation also decreased the expressions of adiponectin and leptin in SC fat. The expressions of adiponectin receptor 1/2 and leptin receptor were significantly decreased in the dermis as well as in SC fat. Moreover, while exogenous adiponectin and leptin administration prevented UV- and TNF-α induced matrix metalloproteinase (MMP)-1 expression, they also increased UV- and TNF-α induced reduction of type 1 procollagen production. Silencing of adiponectin, leptin or their receptors led to an increased MMP-1 and a decreased type 1 procollagen expression, which was reversed by treatment with recombinant human adiponectin or leptin. In conclusion, UV exposure decreases the expression of adiponectin and leptin, leading to the exacerbation of photoaging by stimulating MMP-1 expression and inhibiting procollagen synthesis.
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Affiliation(s)
- Eun Ju Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Yeon Kyung Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Min-Kyoung Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Sungsoo Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Jin Yong Kim
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Dong Hun Lee
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea
| | - Jin Ho Chung
- Department of Dermatology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Laboratory of Cutaneous Aging Research, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Human-Environment Interface Biology, Seoul National University, Seoul, Republic of Korea.,Institute on Aging, Seoul National University, Seoul, Republic of Korea
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A comparative study of UV-induced cell signalling pathways in human keratinocyte-derived cell lines. Arch Dermatol Res 2013; 305:817-33. [PMID: 24071771 DOI: 10.1007/s00403-013-1412-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 09/01/2013] [Accepted: 09/06/2013] [Indexed: 01/01/2023]
Abstract
Ultraviolet (UV) radiation can activate the p38 mitogen-activated protein kinase (MAPK), Jun N-terminal kinase (JNK) and nuclear factor-κB (NFκB) pathways in skin cells. HaCaT cells are widely used as a primary keratinocyte substitute to study these pathways. However, like most squamous cell carcinomas (SCCs), it contains a dysfunctional p53. It is unclear if HaCaT cells activate these signalling pathways similarly to SCC cells (Colo16) or to primary human epidermal keratinocytes (HEK). In this study, the UV activation (UVA, UVB, UVA+B, UVB+A) of p38 MAPK, JNK and NFκB pathways, and TNFα secretion by HEK, HaCaT and Colo16 cells were investigated. The signalling pathway activation was UV-type and dose-dependent with UVB+A radiation inducing a high p38 and JNK activation. HaCaT cells exhibited 2- to 4-fold higher activity of the p38 (771% at 60 min) and JNK (794% at 30 min) pathways following UVB+A radiation than did HEK cells (p38: 367% at 15 min and JNK: 184% at 30 min). While both HaCaT and Colo16 cells did not activate the NFκB pathway, Colo16 cells had a lower p38 and higher JNK activity than HaCaT cells. Irradiated HaCaT cells produced less TNFα (UVB: 3.5 pg/ml), while HEK cells produced the most (UVB: 1,296 pg/ml). When co-exposed to IL1α, irradiated HaCaT had the greatest fold of TNFα release (UVB: 16.2-fold, UVA+B: 8.9-fold and UVB+A: 6.1-fold). The pattern of activation and TNFα secretion of HaCaT cells mirrored that of Colo16 cells. It is likely that the presence of molecular alterations in HaCaT cells may be responsible for its different responses to that seen for HEK cells. The results of this study suggest caution in using HaCaT cells as a substitute for normal keratinocytes in investigating UV-induced cells signalling pathways.
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Ghosh R, Guha D, Bhowmik S, Karmakar S. Antioxidant enzymes and the mechanism of the bystander effect induced by ultraviolet C irradiation of A375 human melanoma cells. Mutat Res 2013; 757:83-90. [PMID: 23845763 DOI: 10.1016/j.mrgentox.2013.06.022] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2012] [Revised: 06/12/2013] [Accepted: 06/30/2013] [Indexed: 11/30/2022]
Abstract
Irradiated cells generate dynamic responses in non-irradiated cells; this signaling phenomenon is known as the bystander effect (BE). Factors secreted by the irradiated cells communicate some of these signals. Conditioned medium from UVC-irradiated A375 human melanoma cells was used to study the BE. Exposure of cells to conditioned medium induce cell-cycle arrest at the G2/M transition. Although conditioned medium treatment, by itself, did not alter cell viability, treated cells were more resistant to the lethal action of UVC or H2O2. This protective effect of conditioned medium was lost within 8h. Apoptotic or autophagic cell death was not involved in this resistance. Exposure to conditioned medium did not influence the rate of DNA repair, as measured by NAD(+) depletion. The activities of catalase and superoxide dismutase were elevated in cells exposed to conditioned medium, but returned to normal levels by 8h post-treatment. These results indicate a close correlation between BE-stimulated antioxidant activity and cellular sensitivity. Cell-cycle arrest and stimulation of antioxidant activity may account for the resistance to killing that was observed in bystander cells exposed to UVC or H2O2 treatment and are consistent with the role of the BE as a natural defense function triggered by UVC irradiation.
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Affiliation(s)
- Rita Ghosh
- Department of Biochemistry and Biophysics, University of Kalyani, Kalyani 741235, West Bengal, India.
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12
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Vostalova J, Rajnochova Svobodova A, Galandakova A, Sianska J, Dolezal D, Ulrichova J. Differential modulation of inflammatory markers in plasma and skin after single exposures to UVA or UVB radiation in vivo. Biomed Pap Med Fac Univ Palacky Olomouc Czech Repub 2013; 157:137-45. [PMID: 23733148 DOI: 10.5507/bp.2013.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2012] [Accepted: 04/30/2013] [Indexed: 01/09/2023] Open
Abstract
BACKGROUND Solar light generates inflammatory responses in exposed skin. These effects are generally attributed to UVB light. However, skin is expose d to a huge quantum of UVA photons as UVA is a predominant part of sunlight and the radiation used in tanning beds. We examined the effects of a single exposure to UVA and UVB wavebands on cytokine levels in skin and plasma, myeloperoxidase (MPO) activity, expression of inducible nitric oxide synthase (iNOS) and cyclooxygenase 2 (COX-2) in skin. METHODS Hairless mice were irradiated with either UVA (10 or 20 J/cm²) or UVB (200 or 800 mJ/cm²). The effects were assessed after 4/24 h. Plasma cytokine levels were evaluated using a Bio-Plex cytokine assay. Cytokine, iNOS and COX-2 levels in skin were determined by Western blot. Skin MPO activity was monitored spectrophotometrically. RESULTS UVB induced up-regulation of interleukin-1β (IL-1β) and interleukin-6 (IL-6) and decrease in interleukin-10 (IL-10) mainly after 4 h. In contrast, UVA caused increase in levels of tumor necrosis factor-alpha (TNF-α) and IL-6 after 4 h and up-regulated IL-10 and interleukin-12 (IL-12) after 24 h. The increase in MPO activity from infiltrated leucocytes was observed only in UVB irradiated animals. iNOS was up-regulated 4 h after UVA and UVB treatment. No significant effect on COX-2 expression was detected. CONCLUSIONS UVA and UVB light affected several inflammatory markers. For individual waveband, changes in plasma parameters did not correlate with those in skin. Thus evaluation of plasma samples cannot simply be replaced by determination in skin specimens and vice versa.
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Affiliation(s)
- Jitka Vostalova
- Department of Medical Chemistry and Biochemistry, Faculty of Medicine and Dentistry, Palacky University Olomouc, Czech Republic
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Ghosh R, Guha D, Bhowmik S. UV Released Factors Induce Antioxidant Defense in A375 Cells. Photochem Photobiol 2012; 88:708-16. [DOI: 10.1111/j.1751-1097.2012.01105.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Pruritus in cutaneous T-cell lymphoma: a review. J Am Acad Dermatol 2012; 67:760-8. [PMID: 22285672 DOI: 10.1016/j.jaad.2011.12.021] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2011] [Revised: 12/12/2011] [Accepted: 12/20/2011] [Indexed: 12/21/2022]
Abstract
BACKGROUND Pruritus can be a distressing and even debilitating symptom for patients with cutaneous T-cell lymphoma (CTCL). To date, few studies have evaluated the pathophysiology of this symptom. Because of this, therapy for pruritus in CTCL has mainly relied on those therapies that target and treat the lymphoma. For patients living with CTCL that relapses or becomes refractory to treatment, and who continue to experience severe itch, this lymphoma-targeted treatment may not be enough to combat their pruritus. Therefore, other itch-targeted therapies are needed for use in this disease. OBJECTIVE We sought to evaluate the current evidence regarding the mechanism of action and treatments for pruritus associated with CTCL. METHODS An explicit and thorough search was restricted to all peer-reviewed literature available through MEDLINE (1950 to September 2011) and PubMed. Search terms used were "pruritus," "cutaneous T-cell lymphoma," "CTCL," "mycosis fungoides," "MF," and "Sézary syndrome." All studies that involved pruritus in CTCL, mycosis fungoides, or Sézary syndrome were evaluated by all 3 authors. RESULTS The current literature helps to identify therapies and possible mechanisms for treating patients with CTCL-associated pruritus. LIMITATION Most studies were preclinical. Only studies involving mechanisms of action or treatment were included. CONCLUSION A guideline is necessary to assist in the treatment of pruritus in CTCL and additional studies are necessary to uncover the exact mechanism or mechanisms of action.
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Reeve VE, Tyrrell RM, Allanson M, Domanski D, Blyth L. The role of interleukin-6 in UVA protection against UVB-induced immunosuppression. J Invest Dermatol 2008; 129:1539-46. [PMID: 19110542 DOI: 10.1038/jid.2008.377] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The proinflammatory cytokine IL-6 is released in the skin following UVB irradiation, but its potential for photoimmune modulation remains unclear. This study utilizes IL-6-deficient mice to demonstrate that IL-6 does not contribute to the normal contact hypersensitivity response, nor to its systemic suppression by UVB radiation or cis-urocanic acid. In contrast, IL-6 was required for the attenuation of UVB- or cis-urocanic acid-induced immunosuppression by sequential or concomitant UVA irradiation. The IL-6 was essential for several reactions previously established to be relevant for UVA photoimmune protection, namely the induction of heme oxygenase-1 (HO-1), the activity of its product carbon monoxide in activating guanylyl cyclase, and the consequent elevation of cutaneous cyclic guanosine monophosphate concentration. In addition, IL-6-deficient mouse skin had an elevated constitutive overexpression of HO activity, apparently not associated with photoimmune protection. This suggested that both the cutaneous level of HO activity, and the receptiveness of the HO-1 gene to stressors like UVA, normally controlled by promoter-binding repressor proteins, may also be under IL-6 control. Thus IL-6 has an important photoimmune protective function through interaction at several levels in the pathway determining the immunologically advantageous actions of UVA radiation. This may constitute a valuable endogenous antiphotocarcinogenic regulatory mechanism.
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Affiliation(s)
- Vivienne E Reeve
- Faculty of Veterinary Science, University of Sydney, Sydney, Australia.
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16
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UVB and proinflammatory cytokines synergistically activate TNF-alpha production in keratinocytes through enhanced gene transcription. J Invest Dermatol 2008; 129:994-1001. [PMID: 19005488 DOI: 10.1038/jid.2008.332] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
UVB irradiation potently induces cytokines in the skin, including IL-1alpha and tumor necrosis factor-alpha (TNF-alpha). The mechanism for TNF-alpha induction in UVB-irradiated keratinocytes is not clear. In this study, we explored the effects of UVB and cytokines, alone or in combination in human keratinocytes. Keratinocytes were sham- or UVB-irradiated with 30 mJ cm(-2), and then incubated in the absence or presence of IFN-alpha2b, TNF-alpha, or IL-1alpha. UVB and IL-1alpha treatment synergistically enhanced TNF-alpha secretion and mRNA levels in human keratinocytes, similar to the findings reported previously in human fibroblasts. Exogenous recombinant TNF-alpha up-regulates its own mRNA level. However, addition of IFN-alpha2b did not show any additive effect on TNF-alpha mRNA induction. To understand the regulation of TNF-alpha mRNA by UVB, with or without IL-1alpha, we examined the transcription rate and half-life of TNF-alpha mRNA. Treatment of keratinocytes with IL-1alpha or UVB alone increased TNF-alpha gene transcription 4- to 5-fold over sham treatment, and TNF-alpha gene transcription increased 11-fold in cells treated with UVB plus IL-1alpha over sham. UVB with IL-1alpha did not enhance the half-life of TNF-alpha mRNA over that seen with UVB alone. In conclusion, TNF-alpha expression in primary keratinocytes is upregulated transcriptionally by UVB and IL-1alpha.
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17
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Bashir MM, Sharma MR, Werth VP. TNF-α production in the skin. Arch Dermatol Res 2008; 301:87-91. [DOI: 10.1007/s00403-008-0893-7] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2008] [Accepted: 08/22/2008] [Indexed: 10/21/2022]
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Abstract
Although the normal cornea is devoid of vasculature and lymphatics, there are still several immune-mediated corneal conditions that can occur in dogs and cats. An overview of corneal immunology is presented. Diseases of dogs, including chronic superficial keratitis, superficial punctate keratitis, and canine adenovirus endotheliitis, as well as feline diseases, including eosinophilic keratitis and herpesvirus-related conditions, are discussed.
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Affiliation(s)
- Stacy E Andrew
- Georgia Veterinary Specialists, 455 Abernathy Road NE, Atlanta, GA 30328, USA
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Cytokine profile in human skin in response to experimental inflammation, noxious stimulation, and administration of a COX-inhibitor: a microdialysis study. Pain 2008; 139:15-27. [PMID: 18396374 DOI: 10.1016/j.pain.2008.02.028] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2007] [Revised: 01/12/2008] [Accepted: 02/25/2008] [Indexed: 11/20/2022]
Abstract
Animal studies have documented a critical role for cytokines in cell signaling events underlying inflammation and pain associated with tissue injury. While clinical reports indicate an important role of cytokines in inflammatory pain, methodological limitations have made systematic human studies difficult. This study examined the utility of a human in vivo bioassay combining microdialysis with multiplex immunoassay techniques for measuring cytokine arrays in tissue. The first experiment measured cytokines in interstitial fluid collected from non-inflamed and experimentally inflamed skin (UVB). The effects of noxious heat on cytokine release were also assessed. The second experiment examined whether anti-hyperalgesic effects of the COX-inhibitor ibuprofen were associated with decreased tissue levels of the pro-inflammatory cytokines IL-1 beta and IL-6. In the first experiment, inflammation significantly increased IL-1 beta, IL-6, IL-8, IL-10, G-CSF, and MIP-1 beta. Noxious heat but not experimental inflammation significantly increased IL-7 and IL-13. In the second experiment, an oral dose of 400 and 800 mg ibuprofen produced similar anti-hyperalgesic effects suggesting a ceiling effect. Tissue levels of IL-1 beta and IL-6 were not affected after the 400mg dose but decreased significantly (44+/-32% and 38+/-13%) after the 800 mg dose. These results support the utility of explored method for tracking cytokines in human tissue and suggest that anti-hyperalgesic and anti-inflammatory effects of ibuprofen are at least partially dissociated. The data further suggest that high clinical doses of ibuprofen exert anti-inflammatory effects by down-regulating tissue cytokine levels. Explored human bioassay is a promising tool for studying the pathology and pharmacology of inflammatory and chronic pain conditions.
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Evaluation of beneficial and adverse effects of glucocorticoids on a newly developed full-thickness skin model. Toxicol In Vitro 2008; 22:747-59. [DOI: 10.1016/j.tiv.2007.11.022] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2007] [Revised: 11/13/2007] [Accepted: 11/28/2007] [Indexed: 11/21/2022]
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21
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Reeve VE, Domanski D, Slater M. Radiation sources providing increased UVA/UVB ratios induce photoprotection dependent on the UVA dose in hairless mice. Photochem Photobiol 2006; 82:406-11. [PMID: 16613492 DOI: 10.1562/2005-09-29-ra-703] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
In studies involving mice in which doses of UVA (320-400 nm) and UVB (290-320 nm) radiation were administered alone or combined sequentially, we observed a protective effect of UVA against UVB-induced erythema/edema and systemic suppression of contact hypersensitivity. The UVA immunoprotection was mediated by the induction of the stress enzyme heme oxygenase-1 (HO-1) in the skin, protection of the cutaneous Th1 cytokines interferon-gamma (IFN-gamma) and IL-12 and inhibition of the UVB-induced expression of the Th2 cytokine IL-10. In this study, we seek evidence for an immunological waveband interaction when UVA and UVB are administered concurrently to hairless mice as occurs during sunlight exposure in humans. A series of spectra providing varying ratios of UVA/UVB were developed, with the UVA ratio increased to approximately 3.5 times the UVA component in solar simulated UV (SSUV). We report that progressively increasing the UVA component of the radiation while maintaining a constant UVB dose resulted in a reduction of both the erythema/edema reaction and the degree of systemic immunosuppression, as measured as contact hypersensitivity. The UVA-enhanced immunoprotection was abrogated in mice treated with a specific HO enzyme inhibitor. UVA-enhanced radiation also upregulated the expression of cutaneous IFN-gamma and IL-12 and inhibited expression of both IL-6 and IL-10, compared with the activity of SSUV. The results were consistent with the previously characterized mechanisms of photoprotection by the UVA waveband alone and suggest that the UVA component of solar UV may have beneficial properties for humans.
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Affiliation(s)
- Vivienne E Reeve
- Faculty of Veterinary Science, University of Sydney, Sydney, Australia.
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22
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Abstract
BACKGROUND Apoptosis, or programmed cell death, is an essential physiological process that controls cell numbers during physiological processes, and eliminates abnormal cells that can potentially harm an organism. OBJECTIVE This review summarizes our current state of knowledge of apoptosis induction in skin by UV radiation. METHODS A review of the literature was undertaken focusing on cell death in the skin secondary to UV radiation. RESULTS It is evident that a number of apoptotic pathways, both intrinsic and extrinsic, are induced following exposure to damaging UV radiation. CONCLUSION Although our understanding of the apoptotic processes is gradually increasing, many important aspects remain obscure. These include interconnections between pathways, wavelength-specific differences and cell type differences.
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Affiliation(s)
- Jeffrey Chow
- Department of Laboratory Medicine and Pathology, 4B1.19 Walter C Mackenzie Health Science Centre, University of Alberta, Edmonton, AB, Canada
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Pastila R, Leszczynski D. Ultraviolet A exposure might increase metastasis of mouse melanoma: a pilot study. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2005; 21:183-90. [PMID: 15998366 DOI: 10.1111/j.1600-0781.2005.00156.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND The major sources of long-wave ultraviolet A radiation (UVA; 320-400 nm) exposure are extensive sunbathing and tanning in solaria. While the carcinogenic effects of mid-wave ultraviolet B radiation (UVB; 280-320 nm) are well recognized, the potentially hazardous effects of UVA are less understood. Several studies have shown that a variety of physiological processes in the cell are modified by UVA exposure, some of which might be involved in the regulation of tumor metastasis. In this study we suggest that UVA radiation could lead to the increase of metastatic capability of melanoma cells in mice. METHOD/RESULT A pilot in vivo study was executed using C57BL/6 mice and syngeneic B16 melanoma cell lines. Mice were intravenously (i.v.) injected with either B16-F1 or B16-F10 melanoma cells into the tail vein and then immediately exposed to UVA. Fourteen days after melanoma injection, lungs were collected and the quantity and quality of metastases were determined under a dissecting microscope. As an outcome of the pilot study we observed that i.v. injected melanoma cells formed more lung metastases in the UVA-exposed mice in comparison with the control mice. CONCLUSION This result suggests that the UVA exposure of mice, with melanoma cells present in blood circulation, increases the formation of melanoma metastases in lungs. Further studies should determine whether a similar pro-metastatic effect, as observed in mice, could occur in humans and whether other than melanoma tumors might be susceptible.
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Affiliation(s)
- Riikka Pastila
- Department of Research and Environmental Surveillance, STUK-Radiation and Nuclear Safety Authority, Helsinki, Finland.
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24
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Abstract
Skin cancer is a large and growing problem in the United States. Sun and other ultraviolet (UV) light exposures play a key role in the development of skin cancer. Pediatricians can play an important role in counseling patients and are in a position to help educate children and their families about skin cancer. The purpose of this review is to familiarize pediatricians with the magnitude of the skin cancer problem and the evidence that ultraviolet light exposure, particularly indoor tanning, contributes to this problem. We reviewed the literature on ultraviolet light and skin cancer (based on a MEDLINE search of articles using the headings "ultraviolet light" and "skin cancer") and found that skin cancer is the most rapidly growing cause of cancer deaths in the United State. There is strong epidemiologic evidence for the relationship between UV exposure and nonmelanoma skin cancer and growing evidence for the relationship between indoor tanning and melanoma. We recommend that pediatricians counsel children and their parents about UV protection. Measures such as use of sunscreen and hats for outdoor play, both at home and in school, should be encouraged.
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Affiliation(s)
- Farah R Abdulla
- Center for Dermatology Research, Department of Dermatology, Wake Forest University School of Medicine, Winston-Salem, North Carolina 27157-1071, USA
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25
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Brenner M, Degitz K, Besch R, Berking C. Differential expression of melanoma-associated growth factors in keratinocytes and fibroblasts by ultraviolet A and ultraviolet B radiation. Br J Dermatol 2005; 153:733-9. [PMID: 16181453 DOI: 10.1111/j.1365-2133.2005.06780.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Besides the direct DNA-damaging effects of ultraviolet (UV) radiation on cells, indirect effects on the microenvironment of the skin may facilitate melanoma development. A stimulation of growth factor production by cells in the immediate environment of melanocytes may lead to a paracrine activation and proliferation of melanocytes that in turn become more susceptible to transformation. OBJECTIVES We investigated whether the expression of growth factors for melanocytes can be modulated in keratinocytes and fibroblasts by UVA or UVB. METHODS After irradiation with different doses of UVA or UVB, protein expression of basic fibroblast growth factor (bFGF), endothelin (ET)-1, transforming growth factor (TGF)-beta1, platelet-derived growth factor (PDGF)-AA, stem cell factor (SCF) and hepatocyte growth factor (HGF) was analysed by quantitative enzyme-linked immunosorbent assay. The mRNA expression of bFGF and ET-1 was analysed by quantitative real-time reverse transcriptase-polymerase chain reaction. RESULTS In keratinocytes, UVB and UVA increased bFGF protein levels up to 2.6-fold. This increase was paralleled by elevated mRNA levels. UVB also induced ET-1 protein up to 1.8-fold, while UVA led to an 80% decrease. Secreted TGF-beta1 and PDGF-AA were downregulated by UVA by less than 50%, while there was no significant alteration by UVB. Secreted SCF was not changed significantly by UVA or UVB. In fibroblasts, bFGF protein levels were increased 11-64-fold by UVA and 34-61-fold by UVB. This was paralleled by elevated mRNA levels for bFGF up to 2.7-fold. HGF protein was stimulated by UVA up to 2.8-fold and by UVB up to 6.7-fold, while TGF-beta1 protein was increased up to 2.7-fold by UVB and 1.7-fold by UVA. CONCLUSIONS UVA and UVB can stimulate and inhibit the production of growth factors for melanocytes in keratinocytes and fibroblasts dependent on the cell type and wavelength. We show for the first time that UVA and UVB can activate bFGF, HGF and TGF-beta1 in fibroblasts, while bFGF was the most inducible factor both in fibroblasts and in keratinocytes. The induction of bFGF and HGF in fibroblasts by UVA suggests that stroma cells in the dermis may be involved in the UV activation of melanocytes via paracrine ways and thus promote melanoma development.
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Affiliation(s)
- M Brenner
- Department of Dermatology, Ludwig-Maximilian University, Frauenlobstrasse 9-11, D-80337 Munich, Germany
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26
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Burd A, Zhu N, Poon VKM. A study of Q-switched Nd:YAG laser irradiation and paracrine function in human skin cells. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2005; 21:131-7. [PMID: 15888129 DOI: 10.1111/j.1600-0781.2005.00155.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND AND OBJECTIVES This preliminary laboratory-based study looks at the paracrine release from human skin cells subject to sublethal Q-switched Nd:YAG 532 nm laser irradiation. STUDY DESIGN/MATERIALS AND METHODS Human dermal fibroblast and keratinocyte cultures were exposed to sublethal energy using the Nd:YAG 532 nm laser. Altered gene expression was then screened using RT-PCR for a range of paracrine factors known to affect melanogenesis, basic fibroblast growth factor (b-FGF), hepatocyte growth factor (HGF), stem cell factor (SCF), melanocyte stimulating hormone (MSH), endothelin-1 (ET-1), interleukin-6 (IL-6), tumor necrosis factor-alpha (TNF-alpha) and protease-activated receptor-2 (PAR-2). Enzyme-linked immunosorbent assay (ELISA) was used to confirm protein production. Conditioned medium was used to assess altered melanogenesis in a melanoma cell line. RESULTS Fibroblasts exposed to sublethal radiation showed upregulation of b-FGF, HGF and SCF. This contrasts with keratinocytes which showed upregulation of IL-6. Elevated protein levels of b-FGF and SCF were confirmed by ELISA assay. Conditioned fibroblast medium was shown to stimulate melanogenesis in a melanoma cell line. CONCLUSIONS This preliminary laboratory study reports, for the first time, specific gene upregulation using the Q-switched Nd:YAG 532 nm laser.
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Affiliation(s)
- Andrew Burd
- Division of Plastic and Reconstructive Surgery, Department of Surgery, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, Hong Kong.
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Di Girolamo N, Chui J, Coroneo MT, Wakefield D. Pathogenesis of pterygia: role of cytokines, growth factors, and matrix metalloproteinases. Prog Retin Eye Res 2004; 23:195-228. [PMID: 15094131 DOI: 10.1016/j.preteyeres.2004.02.002] [Citation(s) in RCA: 198] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Pterygium is a common ocular surface disease apparently only observed in humans. Chronic UV exposure is a widely accepted aetiological factor in the pathogenesis of this disease and this concept is supported by epidemiological data, ray tracing models and histopathological changes that share common features with UV damaged skin. The mechanism(s) of pterygium formation is incompletely understood. Recent data have provided evidence implicating a genetic component, anti-apoptotic mechanisms, cytokines, growth factors, extracellular matrix remodelling (through the actions of matrix metalloproteinases), immunological mechanisms and viral infections in the pathogenesis of this disease. In this review, the current knowledge on pterygium pathogenesis is summarised, highlighting recent developments. In addition, we provide novel data further demonstrating the complexity of this intriguing disease.
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Affiliation(s)
- Nick Di Girolamo
- Department of Pathology, Inflammatory Diseases Research Unit, School of Medical Sciences, University of New South Wales, Sydney 2052, Australia.
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28
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Friedrich M, Holzmann R, Sterry W, Wolk K, Truppel A, Piazena H, Schonbein C, Sabat R, Asadullah K. Ultraviolet B Radiation-Mediated Inhibition of Interferon-γ-Induced Keratinocyte Activation Is Independent of Interleukin-10 and Other Soluble Mediators But Associated with Enhanced Intracellular Suppressors of Cytokine-Signaling Expression. J Invest Dermatol 2003; 121:845-52. [PMID: 14632204 DOI: 10.1046/j.1523-1747.2003.12482.x] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Ultraviolet irradiation represents a well-established treatment modality for inflammatory skin diseases. The aim of this study was to investigate the mechanisms of ultraviolet B radiation-induced keratinocyte insensitivity towards interferon-gamma. Flow cytometric analyses indicated that ultraviolet B radiation temporarily inhibits the interferon-gamma-induced activation of primary keratinocyte and HaCaT cells as measured by reduced intercellular adhesion molecule-1 (CD54) and HLA-DR upregulation. Western blot experiments have suggested that this is mediated by the ultraviolet B radiation-induced inhibition of signal transduction and transcription factor-1 phosphorylation. Neither interleukin-10 neutralization nor interleukin-10 addition had any effect on the ultraviolet B radiation-induced inhibition of interferon-gamma induced intercellular adhesion molecule-1 expression. Furthermore, the supernatant from ultraviolet B-irradiated cells failed to inhibit the interferon-gamma-induced CD54 and HLA-DR upregulation in nonradiated HaCaT cells. Moreover, irradiated cells from whom the supernatant was withdrawn 4 h after irradiation still showed a diminished interferon-gamma-induced response after 24 h. Thus, not soluble but intracellular factors might be involved in the ultraviolet B radiation-induced inhibition of interferon-gamma-induced keratinocyte activation. Therefore, we analyzed the expression of members of suppressors of cytokine-signaling (SOCS) molecules using real-time polymerase chain reaction. We found a fast and strong upregulation of SOCS1 and SOCS3 but not of SOCS2 after ultraviolet B radiation. Similarly, ultraviolet B radiation induced the expression of these particular SOCS molecules in lesional psoriatic skin. As SOCS molecules are known inhibitors of signal transduction and transcription factor phosphorylation, which is essential for interferon-gamma-induced intercellular adhesion molecule-1 and HLA-DR upregulation, this may explain the interferon-gamma unresponsiveness after ultraviolet B radiation.
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Affiliation(s)
- Markus Friedrich
- Department for Dermatology and Allergology, Medical School Charité, Humboldt University Berlin, Berlin, Germany
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Kosmadaki MG, Yaar M, Arble BL, Gilchrest BA. UV induces VEGF through a TNF-alpha independent pathway. FASEB J 2003; 17:446-8. [PMID: 12551841 DOI: 10.1096/fj.02-0379fje] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Vascular endothelial growth factor (VEGF) is a potent keratinocyte-derived angiogenic factor. Prior reports suggest that following UV irradiation VEGF in keratinocytes is induced primarily by tumor necrosis factor (TNF)- alpha, a cytokine synthesized and secreted by keratinocytes after UV irradiation. We investigated whether blocking TNF-alpha binding to its receptors would inhibit UV-induced VEGF expression and secretion in the keratinocyte-derived line SCC-12F. Irradiation with physiologic UV doses (30 mJ/cm2) substantially induced VEGF mRNA in this cell line, as expected, and mRNA induction was followed by increased VEGF in medium conditioned by UV-irradiated cells. Also as expected, TNF-alpha induced VEGF expression and secretion in a dose-dependent manner. Addition of a hexapeptide (Ac-KWIIVW-NH2), known to block TNF-alpha binding to its receptors, abrogated this TNF-alpha effect on VEGF mRNA induction. However, addition of the peptide to cells immediately after UV irradiation did not substantially affect VEGF mRNA induction or secretion into the medium. Our results suggest that VEGF induction after UV irradiation is mediated by multiple mechanisms and that blocking a single pathway does not affect the response.
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Affiliation(s)
- Maria G Kosmadaki
- Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts 02118, USA.
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Palmer H, Ohta M, Watanabe M, Suzuki T. Oxidative stress-induced cellular damage caused by UV and methyl viologen in Euglena gracilis and its suppression with rutin. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2002; 67:116-29. [PMID: 12031812 DOI: 10.1016/s1011-1344(02)00271-3] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The effects of ultraviolet radiation (UV-A: 320-400 nm and UV-B: 280-320 nm) and methyl viologen (MV) single or combined exposure, on the cell growth, viability and morphology of two strains of the unicellular flagellate Euglena gracilis, using the Z strain as a plant model and the achlorophyllous mutant SMZ strain as an animal model were investigated. Cell growth was not affected by MV only, whereas UV-A or UV-B single and combined exposure with MV inhibited the cell growth or decreased the viability. The SMZ strain had a higher number of abnormal cells than the Z strain after the third dose of UV-B was delivered simultaneously with MV. The abnormal cell number decreased when E. gracilis SMZ cells were preincubated with 100 microM rutin prior to the UV-B and MV exposure. There were higher abnormal cell numbers with groups exposed to UV rather than MV single exposure. Combined exposure to UV-B and 200 microM MV induced the highest levels of TBARS in both strains, and with the supplementation of rutin these high levels were suppressed. These results suggest that UV-A or UV-B irradiation alone or combined with MV cause considerable oxidative damage in E. gracilis cells, and rutin supplementation may suppress their adverse effects.
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Affiliation(s)
- Helen Palmer
- Laboratory of Food Wholesomeness, Department of Life Sciences, Graduate School of Fisheries Science, Hokkaido University, 3-1-1 Minato, Hakodate 041-8611, Japan
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31
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Farkas B, Magyarlaki M, Csete B, Nemeth J, Rabloczky G, Bernath S, Literáti Nagy P, Sümegi B. Reduction of acute photodamage in skin by topical application of a novel PARP inhibitor. Biochem Pharmacol 2002; 63:921-32. [PMID: 11911844 DOI: 10.1016/s0006-2952(01)00929-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
The ultraviolet (UV) components of sunlight induce damage to the DNA in skin cells, which is considered to be the initiating step in the harmful biological effects of UV radiation. Repair of DNA damage results in the formation of single-strand DNA breaks, which activate the nuclear poly(ADP-ribose) polymerase (PARP). Overactivation of PARP worsens the oxidative cell damage and impairs the energy metabolism, raising the possibility that moderation of PARP activation following DNA damage may protect skin cells from UV radiation. The topical effects of the novel PARP inhibitor O-(3-pyperidino-2-hydroxy-1-propyl) pyridine-3-carboxylic acid amidoxime monohydrochloride (BGP-15M) were investigated on UV-induced skin damage in a hairless mouse model. For evaluation of the UV-induced acute photodamage to the skin and the potential protective effect of BGP-15M, DNA injury was detected by measuring the formation of single-strand DNA breaks and counting the resulting sunburn (apoptotic) cells. The ADP-ribosylation of PARP was assessed by Western blot analysis and then quantified. In addition, the UV-induced immunosuppression was investigated by the immunostaining of tumor necrosis factor alpha and interleukin-10 expressions in epidermal cells. The signs of inflammation were examined clinically and histochemically. Besides its primary effect in decreasing the activity of nuclear PARP, topically applied BGP-15M proved to be protective against solar and artificial UV radiation-induced acute skin damage. The DNA injury was decreased (P<0.01). An inhibition of immunosuppression was observed by down-regulation of the epidermal production of cytokines IL-10 and TNFalpha. In the mouse skin, clinical or histological signs of UV-induced inflammation could not be observed. These data suggest that BGP-15M directly interferes with UV-induced cellular processes and modifies the activity of PARP. The effects provided by topical application of the new PARP-regulator BGP-15M indicate that it may be a novel type of agent in photoprotection of the skin.
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Affiliation(s)
- Beatrix Farkas
- Department of Dermatology, Faculty of Medicine, University of Pecs, Kodaly u. 20, H-7624, Pecs, Hungary.
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