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Santiesteban-Romero B, Martínez-Ruiz M, Sosa-Hernández JE, Parra-Saldívar R, Iqbal HMN. Microalgae Photo-Protectants and Related Bio-Carriers Loaded with Bioactive Entities for Skin Applications—An Insight of Microalgae Biotechnology. Mar Drugs 2022; 20:md20080487. [PMID: 36005491 PMCID: PMC9409820 DOI: 10.3390/md20080487] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 07/21/2022] [Accepted: 07/26/2022] [Indexed: 02/04/2023] Open
Abstract
Microalgae are photosynthetic organisms known for producing valuable metabolites under different conditions such as extreme temperatures, high salinity, osmotic pressure, and ultraviolet radiation. In recent years, these metabolites have become a trend due to their versatility in applications such as pharmaceuticals, cosmetics, and others. They have even been proposed as an alternative source of bioactive metabolites to avoid the harmful effects on the environment produced by active compounds such as oxybenzone in commercials sunscreens. One of the most studied applications is the use of microalgae for skin care and topical use as cosmeceuticals. With the increasing demand for more environmentally friendly products in cosmetics, microalgae have been further explored in relation to this application. It has been shown that some microalgae are resistant to UV rays due to certain compounds such as mycosporine-like amino acids, sporopollenin, scytonemin, and others. These compounds have different mechanisms of action to mitigate UV damage induced. Still, they all have been proven to confer UV tolerance to microalgae with an absorbance spectrum like the one in conventional sunscreens. This review focuses on the use of these microalgae compounds obtained by UV stimulation and takes advantage of their natural UV-resistant characteristics to potentially apply them as an alternative for UV protection products.
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Affiliation(s)
- Berenice Santiesteban-Romero
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico; (B.S.-R.); (M.M.-R.); (J.E.S.-H.)
| | - Manuel Martínez-Ruiz
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico; (B.S.-R.); (M.M.-R.); (J.E.S.-H.)
- Tecnologico de Monterrey, Institute of Advanced Materials for Sustainable Manufacturing, Monterrey 64849, Mexico
| | - Juan Eduardo Sosa-Hernández
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico; (B.S.-R.); (M.M.-R.); (J.E.S.-H.)
- Tecnologico de Monterrey, Institute of Advanced Materials for Sustainable Manufacturing, Monterrey 64849, Mexico
| | - Roberto Parra-Saldívar
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico; (B.S.-R.); (M.M.-R.); (J.E.S.-H.)
- Tecnologico de Monterrey, Institute of Advanced Materials for Sustainable Manufacturing, Monterrey 64849, Mexico
- Correspondence: (R.P.-S.); (H.M.N.I.)
| | - Hafiz M. N. Iqbal
- Tecnologico de Monterrey, School of Engineering and Sciences, Monterrey 64849, Mexico; (B.S.-R.); (M.M.-R.); (J.E.S.-H.)
- Tecnologico de Monterrey, Institute of Advanced Materials for Sustainable Manufacturing, Monterrey 64849, Mexico
- Correspondence: (R.P.-S.); (H.M.N.I.)
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González S, Aguilera J, Berman B, Calzavara-Pinton P, Gilaberte Y, Goh CL, Lim HW, Schalka S, Stengel F, Wolf P, Xiang F. Expert Recommendations on the Evaluation of Sunscreen Efficacy and the Beneficial Role of Non-filtering Ingredients. Front Med (Lausanne) 2022; 9:790207. [PMID: 35433750 PMCID: PMC9008233 DOI: 10.3389/fmed.2022.790207] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2021] [Accepted: 03/04/2022] [Indexed: 11/23/2022] Open
Abstract
A variety of non-filtering agents have been introduced to enhance sunscreen photoprotection. Most of those agents have only weak erythema protective properties but may be valuable and beneficial in supporting protection against other effects of UV radiation, such as photoimmunosuppression, skin aging, and carcinogenesis, as well as photodermatoses. The question arises how to measure and evaluate this efficacy since standard SPF testing is not appropriate. In this perspective, we aim to provide a position statement regarding the actual value of SPF and UVA-PF to measure photoprotection. We argue whether new or additional parameters and scales can be used to better indicate the protection conferred by these products against the detrimental effects of natural/artificial, UV/visible light beyond sunburn, including DNA damage, photoimmunosuppression and pigmentation, and the potential benefits of the addition of other ingredients beyond traditional inorganic and organic filters to existing sunscreens. Also, we debate the overall usefulness of adding novel parameters that measure photoprotection to reach two tiers of users, that is, the general public and the medical community; and how this can be communicated to convey the presence of additional beneficial effects deriving from non-filtering agents, e.g., biological extracts. Finally, we provide a perspective on new challenges stemming from environmental factors, focusing on the role of the skin microbiome and the role of air pollutants and resulting needs for photoprotection.
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Affiliation(s)
- Salvador González
- Medicine and Medical Specialties Department, University of Alcalá de Henares, Madrid, Spain
- *Correspondence: Salvador González,
| | - José Aguilera
- Dermatological Photobiology Laboratory, Medical Research Center, School of Medicine, University of Málaga, Málaga, Spain
| | - Brian Berman
- Department of Dermatology and Cutaneous Surgery, University of Miami-Florida, Miami, FL, United States
| | | | - Yolanda Gilaberte
- Department of Dermatology, Hospital Universitario Miguel Servet, IIS Aragón, Zaragoza, Spain
| | | | - Henry W. Lim
- Department of Dermatology, Henry Ford Health System, Detroit, MI, United States
| | - Sergio Schalka
- Photoprotection Laboratory, Medicine Skin Research Center, São Paulo, Brazil
| | | | - Peter Wolf
- Department of Dermatology, Medical University of Graz, Graz, Austria
| | - Flora Xiang
- Department of Dermatology, Shanghai Medical College, Huashan Hospital, Fudan University, Shanghai, China
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Andrews DQ, Rauhe K, Burns C, Spilman E, Temkin AM, Perrone-Gray S, Naidenko OV, Leiba N. Laboratory testing of sunscreens on the US market finds lower in vitro SPF values than on labels and even less UVA protection. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2021; 38:224-232. [PMID: 34601762 PMCID: PMC9298345 DOI: 10.1111/phpp.12738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 07/27/2021] [Accepted: 09/26/2021] [Indexed: 12/03/2022]
Abstract
Background New research has attributed increased significance to the causal link between ultraviolet A (UVA) radiation and immunosuppression and carcinogenesis. In the United States, sunscreens are labeled with only their sun protection factor (SPF) and an imprecise term “broad‐spectrum protection.” Sunscreen marketing and efficacy evaluations continue to be based primarily on skin redness (sunburn) or erythema. We sought to evaluate the ultraviolet (UV) protection offered by common sunscreen products on the US market using laboratory‐measured UV‐absorption testing and comparing with computer‐modeled protection and the labeled SPF values. This approach enables an investigation of the relationship between the labeled SPF and measured UVA protection, a factor that is ignored in current regulations. Methods Fifty‐one sunscreen products for sale in the United States with SPF values from 15 to 110 and labeled as providing broad‐spectrum protection were tested using a commercial laboratory. All products were evaluated using the ISO 24443:2012 method for sunscreen effectiveness. The final absorbance spectra were used for analysis of in vitro UV protection. Results In vitro SPF values from laboratory‐measured UV absorption and computer modeling were on average just 59 and 42 percent of the labeled SPF. The majority of products provided significantly lower UVA protection with the average unweighted UVA protection factor just 24 percent of the labeled SPF. Conclusion Regulations and marketplace forces promote sunscreens that reduce sunburn instead of products that provide better, more broad‐spectrum UV protection. The production and use of products with broad spectrum UV protection should be incentivized, removing the emphasis on sunburn protection and ending testing on people.
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Affiliation(s)
| | - Kali Rauhe
- Environmental Working Group, Washington, D.C., USA
| | - Carla Burns
- Environmental Working Group, Washington, D.C., USA
| | | | | | | | | | - Nneka Leiba
- Environmental Working Group, Washington, D.C., USA
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4
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Keurentjes AJ, Jakasa I, van Dijk A, van Putten E, Brans R, John SM, Rustemeyer T, van der Molen HF, Kezic S. Stratum corneum biomarkers after in vivo repeated exposure to sub-erythemal dosages of ultraviolet radiation in unprotected and sunscreen (SPF 50+) protected skin. PHOTODERMATOLOGY PHOTOIMMUNOLOGY & PHOTOMEDICINE 2021; 38:60-68. [PMID: 34278599 DOI: 10.1111/phpp.12717] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 06/16/2021] [Accepted: 07/04/2021] [Indexed: 02/06/2023]
Abstract
BACKGROUND There is a need for non-invasive biomarkers to assess in vivo efficacy of protective measures aiming at reducing ultraviolet radiation (UVR) exposure. Stratum corneum (SC) biomarkers showed to be promising markers for internal UVR dose and immune response. PURPOSE To establish a dose-response relationship for SC biomarkers and explore their suitability for in vivo assessment of the blocking effect of two sunscreens with a high sun protection factor (SPF) (50+). METHODS Twelve volunteers were exposed to a broad-spectrum UVB (280-320 nm), five times a week, during one week. Unprotected back skin was irradiated with 0.24, 0.48, 0.72 and 1.44 standard erythema dose (SED) and sunscreen-protected skin with 3.6 SED. SC samples for determination of the relative amount of cis-urocanic acid (cUCA) and thirteen immunological makers including cytokines and matrix metalloproteinases (MMP) were collected after each irradiation. RESULTS cUCA sharply increased after the first irradiation in a dose-dependent fashion. However, it levelled-off after subsequent exposures and reached a plateau for the highest UV-dose after the third irradiation. None of the immunological markers showed dose-dependency. However, MMP-9, IL-1β and CCL27 increased gradually from baseline during repetitive exposures to the highest UV-dose. Assessed from cUCA, both sunscreens blocked >98% of the applied UV-dose. CONCLUSIONS cUCA is a sensitive, non-invasive marker of the internal UVR dose enabling in vivo assessment of the blocking effect of high SPF sunscreens in the UVB-region. Immunological SC markers show low sensitivity in detecting immune response at sub-erythemal UVR dosages, suggesting they might be suitable only at higher and/or repetitive UVR exposure.
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Affiliation(s)
- Anne Josephine Keurentjes
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
| | - Ivone Jakasa
- Department of Chemistry and Biochemistry, Laboratory for Analytical Chemistry, Faculty of Food Technology and Biotechnology, University of Zagreb, Zagreb, Croatia
| | - Arjan van Dijk
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Edith van Putten
- Center for Environmental Safety and Security, National Institute for Public Health and the Environment (RIVM), Bilthoven, The Netherlands
| | - Richard Brans
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück, Osnabrück, Germany
| | - Swen Malte John
- Department of Dermatology, Environmental Medicine and Health Theory, University of Osnabrück, Osnabrück, Germany.,Institute for Interdisciplinary Dermatological Prevention and Rehabilitation (iDerm) at the University of Osnabrück, Osnabrück, Germany
| | - Thomas Rustemeyer
- Department of Dermatology and Allergology, Amsterdam UMC, Amsterdam, The Netherlands
| | - Henk F van der Molen
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
| | - Sanja Kezic
- Department of Public and Occupational Health, Amsterdam UMC, University of Amsterdam, Amsterdam Public Health research institute, Amsterdam, The Netherlands
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Aguilera J, Vicente-Manzanares M, de Gálvez MV, Herrera-Ceballos E, Rodríguez-Luna A, González S. Booster Effect of a Natural Extract of Polypodium leucotomos (Fernblock®) That Improves the UV Barrier Function and Immune Protection Capability of Sunscreen Formulations. Front Med (Lausanne) 2021; 8:684665. [PMID: 34150816 PMCID: PMC8206277 DOI: 10.3389/fmed.2021.684665] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Accepted: 05/07/2021] [Indexed: 01/11/2023] Open
Abstract
Background: Novel approaches to photoprotection must go beyond classical MED measurements, as discoveries on the effect of UV radiation on skin paints a more complex and multi-pronged scenario with multitude of skin cell types involved. Of these, photoimmunoprotection emerges as a crucial factor that protects against skin cancer and photoaging. A novel immune parameter is enabled by the precise knowledge of the wavelength and dose of solar radiation that induces photoimmunosupression. Natural substances, that can play different roles in photoprotection as antioxidant, immune regulation, and DNA protection as well as its possible ability as sunscreen are the new goals in cosmetic industry. Objective: To analyze the effect of a specific natural extract from Polypodium leucotomos (PLE, Fernblock®), as part of topical sunscreen formulations to protect from photoimmunosuppression, as well as other deleterious biological effects of UV radiation. Methods: The possible sunscreen effect of PLE was analyzed by including 1% (w/w) PLE in four different galenic formulations containing different combinations of UVB and UVA organic and mineral filters. In vitro sun protection factor (SPF), UVA protection factor (UVA-PF), contact hypersensitivity factor (CHS), and human immunoprotection factor (HIF) were estimated following the same protocol as ISO 24443:2012 for in vitro UVA-PF determination. Results: PLE-containing formulations significantly reduced UV radiation reaching to skin. Combination of UVB and UVA filters with PLE increased SPF and UVAPF significantly. PLE also increased UV immune protection, by elevating the contact hypersensitivity factor and the human immunoprotective factor of the sunscreen formulations. Conclusion: This study confirms the double role of PLE in photoprotection. Together to the biological activity shown in previous works, the UV absorption properties of PLE confers a booster effect when it is supplemented in topical sunscreens increasing the protection not only at level of erythema and permanent pigment darkening but also against two photoimmunoprotection factors.
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Affiliation(s)
- Jose Aguilera
- Photobiological Dermatology Laboratory, Department of Dermatology and Medicine, Faculty of Medicine, Medical Research Center, University of Málaga, Málaga, Spain
| | - Miguel Vicente-Manzanares
- Molecular Mechanisms Program, Centro de Investigación del Cáncer and Instituto de Biología Molecular y Celular del Cáncer, Consejo Superior de Investigaciones Científicas-University of Salamanca, Salamanca, Spain
| | - María Victoria de Gálvez
- Photobiological Dermatology Laboratory, Department of Dermatology and Medicine, Faculty of Medicine, Medical Research Center, University of Málaga, Málaga, Spain
| | - Enrique Herrera-Ceballos
- Photobiological Dermatology Laboratory, Department of Dermatology and Medicine, Faculty of Medicine, Medical Research Center, University of Málaga, Málaga, Spain.,Dermatology Service, Hospital Clínico Universitario Virgen de la Victoria, Málaga, Spain
| | | | - Salvador González
- Department of Medicine and Medical Specialties, Alcalá de Henares University, Madrid, Spain
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Kumari H, Eisenhart A, Pajoubpong J, Heinrich F, Beck TL. Investigating partitioning of free versus macrocycle bound guest into a model POPC lipid bilayer. RSC Adv 2020; 10:15148-15153. [PMID: 35495443 PMCID: PMC9052308 DOI: 10.1039/d0ra02850a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2020] [Accepted: 03/31/2020] [Indexed: 01/01/2023] Open
Abstract
We report on the permeation of free and macrocycle-bound avobenzone across a POPC lipid bilayer through combined neutron reflectometry experiments and molecular dynamics simulations. Results indicate that the p-phosphonated calix[8]arene macrocycle limits the avobenzone penetration into the upper leaflet of the membrane. Hence, it could serve as a useful vehicle for safer formulations. We report on the permeation of free and macrocycle-bound avobenzone across a POPC lipid bilayer through combined neutron reflectometry experiments and molecular dynamics simulations.![]()
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Affiliation(s)
- Harshita Kumari
- James L. Winkle College of Pharmacy
- University of Cincinnati
- Cincinnati
- USA
| | | | | | - Frank Heinrich
- Department of Physics
- Carnegie Mellon University
- Pittsburgh
- USA
- Center for Neutron Research
| | - Thomas L. Beck
- Department of Chemistry
- University of Cincinnati
- Cincinnati
- USA
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7
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Abstract
Lupus erythematosus (LE) represents a spectrum of inflammatory autoimmune disease comprising varying clinical entities ranging from primary cutaneous to systemic disease. There is a clear relationship between ultraviolet irradiation (UVR) and the clinical manifestations of LE in both adult and pediatric populations. Although it has been established that UVR exacerbates pre-existing LE, it remains unclear whether UVR induces the development of the disease. This review serves to discuss effective photoprotective measures in LE and describe the pathogenic relationship of UVR and LE.
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Affiliation(s)
- Jusleen Ahluwalia
- Department of Dermatology, University of California, San Diego School of Medicine, La Jolla, USA
| | - Amanda Marsch
- Department of Dermatology, University of California, San Diego School of Medicine, La Jolla, USA
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8
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Raffa RB, Pergolizzi JV, Taylor R, Kitzen JM. Sunscreen bans: Coral reefs and skin cancer. J Clin Pharm Ther 2018; 44:134-139. [PMID: 30484882 DOI: 10.1111/jcpt.12778] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 09/18/2018] [Accepted: 10/19/2018] [Indexed: 12/24/2022]
Abstract
WHAT IS KNOWN AND OBJECTIVE Hawaii will ban two major ingredients of sunscreens. This article reviews the reasons and future directions. Hawaii recently enacted legislation that will ban the use of two major ingredients of the majority of commonly used sunscreens. The reason for the ban is the ingredients' putative deleterious impact on marine ecosystems, particularly coral reefs. But sunscreens also save lives by decreasing the risk of UV-induced skin cancers. We review both sides of the issue and potential implications for the healthcare system. COMMENT Coral reefs consist of organisms in delicate equilibria that are susceptible to small changes in their surroundings. Recent natural and man-made disruptions, direct or indirect, such as changes in ocean temperature and chemistry, ingress of invasive species, pathogens, pollution and deleterious fishing practices, have been blamed for the poor health, or even the outright destruction, of some coral reefs. The most popular sunscreen products contain two ingredients-oxybenzone and octinoxate-that have also been implicated in coral toxicity and will be banned. This creates a healthcare dilemma: Will the protection of coral reefs result in an increase in human skin cancers? WHAT IS NEW AND CONCLUSION Concentration estimates and mechanism studies support an association-direct or indirect (via promotion of viral infection)-of sunscreens with bleaching of coral reefs. A ban on the two most common sunscreen ingredients goes into effect in Hawaii on January 1, 2021. Proponents suggest that this is a trend, just the first of many such bans worldwide; opponents warn of a dire increase in human skin cancers. As a result, alternative sunscreen compounds are being sought.
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Affiliation(s)
- Robert B Raffa
- University of Arizona College of Pharmacy, Tucson, Arizona.,Temple University School of Pharmacy, Philadelphia, Pennsylvania.,Neumentum, Inc., Palo Alto, California
| | - Joseph V Pergolizzi
- Neumentum, Inc., Palo Alto, California.,NEMA Research, Inc., Naples, Florida
| | | | - Jan M Kitzen
- Kitzen Pharmaceutical Consulting, Collegeville, Pennsylvania
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Bostom AG, Merhi B, Walker J, Robinson-Bostom L. More than skin deep? Potential nicotinamide treatment applications in chronic kidney transplant recipients. World J Transplant 2016; 6:658-664. [PMID: 28058215 PMCID: PMC5175223 DOI: 10.5500/wjt.v6.i4.658] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Revised: 10/03/2016] [Accepted: 11/02/2016] [Indexed: 02/05/2023] Open
Abstract
Non-melanoma cutaneous carcinomas, or skin cancers, predominantly squamous cell carcinomas (SCCs), are the most common malignancies occurring in kidney transplant recipients (KTRs). Squamous cell carcinoma risk is dramatically elevated in KTRs, occurring at rates of up 45-250 times those reported in general populations. New non-melanoma skin cancers in KTRs with a prior non-melanoma skin cancer also develop at 3-times the rate reported in non-KTRs with the same clinical history. The unique aggressiveness of SCCs in KTRs increases patient morbidity, due to the high rate of new lesions requiring treatment, frequently surgical excision. Oral nicotinamide shows promise in the chemoprevention of the especially aggressive non-melanoma skin cancers which occur in KTRs. This benefit might be conferred via its inhibition of sirtuin enzymatic pathways. Nicotinamide’s concurrent hypophosphatemic effect may also partially ameliorate the disturbed calcium-phosphorus homeostasis in these patients-a putative risk factor for mortality, and graft failure. Conceivably, a phase 3 trial of nicotinamide for the prevention of non-melanoma skin cancers in KTRs, lasting at least 12-mo, could also incorporate imaging and laboratory measures which assess nicotinamide’s impact on subclinical cardiovascular and chronic kidney disease risk, and progression.
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Abstract
A well-established link between ultraviolet exposure and the carcinogenesis of keratinocyte carcinomas exists. Despite increased sun protection efforts, skin cancer remains the most common cancer in the USA. Numerous studies on the topic of chemoprevention investigate alternative topical, oral, and injectable agents to reduce skin cancer incidence in those at risk. Such agents include sunscreen, numerous vitamins and minerals, difluoromethylornithine, non-steroidal anti-inflammatory drugs, various peptides, field therapy, statins, and polyphenols. In this focused review, we discuss the risks and benefits of chemoprotective agents reported in clinical studies conducted in humans. We report several agents that may reduce skin cancer incidence in those at risk.
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11
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Abstract
The North American public maintains an attitude that equates the acquisition of a suntan with health. However, prolonged exposure to ultraviolet radiation from the sun can lead to sunburn, premature skin aging, immunosuppression, and skin cancer. Misconceptions about the risks of tanning beds and the effectiveness of sunscreens are common. The public must be better informed about the importance of and the need for effective sun protection by means of clothing and hats, the proper use of sunscreen, and the avoidance of prolonged sun exposure during the time of maximal solar insolation.
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Affiliation(s)
- Jason K. Rivers
- From the Department of Dermatology, Faculty of Medicine, University of British Columbia, and Skin Care Centre, Vancouver General Hospital, Vancouver, BC; Division of Dermatology, McGill University, Royal Victoria Hospital, Montréal, PQ; and Division of Dermatology, University of Montréal, Sainte-Justine Hospital, Montréal, PQ
| | - Beatrice Wang
- From the Department of Dermatology, Faculty of Medicine, University of British Columbia, and Skin Care Centre, Vancouver General Hospital, Vancouver, BC; Division of Dermatology, McGill University, Royal Victoria Hospital, Montréal, PQ; and Division of Dermatology, University of Montréal, Sainte-Justine Hospital, Montréal, PQ
| | - Danielle Marcoux
- From the Department of Dermatology, Faculty of Medicine, University of British Columbia, and Skin Care Centre, Vancouver General Hospital, Vancouver, BC; Division of Dermatology, McGill University, Royal Victoria Hospital, Montréal, PQ; and Division of Dermatology, University of Montréal, Sainte-Justine Hospital, Montréal, PQ
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12
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Sola Y, Lorente J. Contribution of UVA irradiance to the erythema and photoaging effects in solar and sunbed exposures. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2014; 143:5-11. [PMID: 25579807 DOI: 10.1016/j.jphotobiol.2014.10.024] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 10/10/2014] [Accepted: 10/14/2014] [Indexed: 01/19/2023]
Abstract
Even though UVA irradiance had not been considered detrimental to human skin for years, nowadays it is recognized for its role in photoaging and other biological responses. The ratio UVA/UVB is about 17 at a solar zenith angle (SZA) of 20° and it is almost constant up to 60° when it rapidly increases since the UVB wavelengths (280-320nm) are more attenuated than the UVA waveband (320-400nm). For a constant SZA, the ratio increases with the ozone content. The UVA component of the solar erythemal irradiance ranges from 20% at 20° to 30% at 60°, whereas it varies from 50% to 80% in the two different types of measured sunbeds. Moreover, the different spectral distribution of the lamps used for artificial tanning leads frequently to high UVA doses. The biological responses related to skin photoaging (skin sagging and elastosis) could be around fourfold the equivalent solar irradiance at midday in summer midlatitudes and they can be important in unprotected UVA exposures to sunbeds. The UVA dose accumulated during the time required in reaching 1 minimum erythemal dose (MED) increases with the SZA since the exposure durations are longer. Indeed, seasonal differences in the mean UVA dose are observed due to variations in the ozone content that results in longer exposure times without erythema. Although an artificial tanning session is usually shorter than one hour, the UVA dose from sunbeds during the time for 1 MED for skin type II (250Jm(-2)) can be 2-4 times larger than the solar dose, depending on the lamp spectral emission.
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Affiliation(s)
- Yolanda Sola
- Dept. Astronomy and Meteorology, University of Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain.
| | - Jerónimo Lorente
- Dept. Astronomy and Meteorology, University of Barcelona, Martí i Franquès 1, E-08028 Barcelona, Spain
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13
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Abstract
Living on a sun-drenched planet has necessitated adaption to and protection from the harmful effects of solar ultraviolet (UV) radiation, particularly skin cancer. However, convincing epidemiological and recent empirical evidence also supports a protective effect of UV against a range of diseases including multiple sclerosis, asthma and cardiovascular disease. Despite years of research attention into the biological effects of sunlight exposure, we are still far from being able to fully answer the question: How much sunlight is enough? This is probably because the answer is dependent on many complex and interacting variables. Many talented researchers are focused on exploring whether UV-induced vitamin D explains some of these effects. This perspectives article proposes an alternative hypothesis, namely that targeting UV-induced immune suppression by affecting the activation of regulatory cells and molecules will be of therapeutic benefit.
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Affiliation(s)
- Scott N Byrne
- Cellular Photoimmunology Group, Discipline of Infectious Diseases and Immunology, Sydney Medical School, University of Sydney, Australia.
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15
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Kociolek MG, Casbohm JS. Benzisoxazole 2-oxides as novel UV absorbers and photooxidation inhibitors. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Jerry S. Casbohm
- School of Science; Penn State Erie, The Behrend College; Erie Pennsylvania USA
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16
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Fourtanier A, Moyal D, Seite S. UVA filters in sun-protection products: regulatory and biological aspects. Photochem Photobiol Sci 2012; 11:81-9. [DOI: 10.1039/c1pp05152k] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Halliday GM, Byrne SN, Damian DL. Ultraviolet A Radiation: Its Role in Immunosuppression and Carcinogenesis. ACTA ACUST UNITED AC 2011; 30:214-21. [DOI: 10.1016/j.sder.2011.08.002] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2011] [Accepted: 08/07/2011] [Indexed: 11/29/2022]
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Norval M, Halliday GM. The consequences of UV-induced immunosuppression for human health. Photochem Photobiol 2011; 87:965-77. [PMID: 21749399 DOI: 10.1111/j.1751-1097.2011.00969.x] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Exposure to UV radiation can cause suppression of specific immune responses. The pathways leading to the down-regulation are complex, starting from the absorption of UV photons by chromophores in the skin and ending with local and systemic changes in immune mediators, the generation of T and B regulatory cells and inhibition of effector and memory T cell activation. The consequences for human health are thought to be both beneficial and adverse. The former are illustrated by protection against polymorphic light eruption, and possible protection against T cell-mediated autoimmune diseases and asthma. The latter are illustrated by skin cancer, cutaneous lupus erythematosus and infectious diseases including vaccination. Many outstanding questions remain in this rapidly developing and controversial area, not least what advice to give the general public regarding their sun exposure. While considerable advances have been made in the development of strategies that preserve the health benefits of sunlight exposure and decrease its detrimental effects, further research is required before optimal levels of protection are achieved.
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Affiliation(s)
- Mary Norval
- Biomedical Sciences, University of Edinburgh, Edinburgh, Scotland.
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Ghazeeri G, Abdullah L, Abbas O. Immunological differences in women compared with men: overview and contributing factors. Am J Reprod Immunol 2011; 66:163-9. [PMID: 21749547 DOI: 10.1111/j.1600-0897.2011.01052.x] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
CITATION Ghazeeri G, Abdullah L, Abbas O. Immunological differences in women compared with men: overview and contributing factors. Am J Reprod Immunol 2011; 66: 163-169 Gender differences in the innate and adaptive immune systems have long been observed in humans. These immunological differences in immune function manifest as diverse susceptibilities to different types of infections and varied risks of developing autoimmune disorders and maybe even, cancers. Several factors contribute to the development of this immunological dimorphism including sex hormones, genetic makeup, environmental causes, and more recently microchimerism. Although the aim behind this sexual immune dimorphism is still unclear, it is tempting to believe that the higher risk of developing autoimmune diseases in women somehow serves the higher evolutionary goal of reproduction and creating new life.
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Affiliation(s)
- Ghina Ghazeeri
- Department of Obstetrics & Gynecology, American University of Beirut-Medical Center, Beirut, Lebanon
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Damian DL, Matthews YJ, Phan TA, Halliday GM. An action spectrum for ultraviolet radiation-induced immunosuppression in humans. Br J Dermatol 2011; 164:657-9. [PMID: 21375518 DOI: 10.1111/j.1365-2133.2010.10161.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The immune-suppressive effects of sunlight play a central role in skin carcinogenesis. Ultraviolet (UV) B radiation is highly immunosuppressive even at suberythemal doses, and longwave UVA is now also recognized to cause immunosuppression in humans. The relative contributions of UVA and UVB to immunosuppression by incidental daily sun exposure are, however, unclear. OBJECTIVES We previously determined wavelength dependencies for immunosuppression by UVB and UVA wavebands in humans. We now aimed to calculate relative and solar immune-suppressive effectiveness across the UVB and UVA spectra. METHODS We used the nickel model of recall contact hypersensitivity to determine UV immunosuppression dose responses and minimum immune suppression doses (MISDs) at 11 narrowbands from 289 to 392 nm. The relative immune-suppressive effectiveness of each narrowband was then determined as 1/MISD vs. wavelength. This curve was multiplied by the solar spectrum to show the relative immune-suppressive effectiveness of each waveband in sunlight. RESULTS We found peaks of immune-suppressive effectiveness in the UVB waveband at 300 nm and in the UVA at 370 nm. Because of the far greater amount of longwave UVA in sunlight, the relative solar immune-suppressive effectiveness of UVA was threefold higher than that of UVB at doses equivalent to sun exposure from normal daily activities. CONCLUSIONS Longwave UVA, which abuts the visible light spectrum and is less effectively filtered by sunscreens than UVB, is likely to be the largest contributor to immunosuppression resulting from incidental daily sun exposure.
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Affiliation(s)
- D L Damian
- Discipline of Dermatology, Bosch Institute, The University of Sydney at Royal Prince Alfred Hospital, Camperdown, Sydney, NSW, Australia.
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Matthews YJ, Halliday GM, Phan TA, Damian DL. Wavelength dependency for UVA-induced suppression of recall immunity in humans. J Dermatol Sci 2010; 59:192-7. [DOI: 10.1016/j.jdermsci.2010.07.005] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2010] [Revised: 03/18/2010] [Accepted: 07/12/2010] [Indexed: 11/29/2022]
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Wu Y, Matsui MS, Chen JZS, Jin X, Shu CM, Jin GY, Dong GH, Wang YK, Gao XH, Chen HD, Li YH. Antioxidants add protection to a broad-spectrum sunscreen. Clin Exp Dermatol 2010; 36:178-87. [DOI: 10.1111/j.1365-2230.2010.03916.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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Abstract
Sun protective measures can reduce numbers of both precancerous actinic keratoses and cutaneous squamous cell carcinomas within relatively short periods of time even in high-risk populations. Sunscreens, which tend to provide greater protection against shortwave UVB than against longer wavelength UVA radiation, can however provide only partial protection from the mutagenic and immune suppressive effects of sunlight. In large part, this reflects poor compliance with proper sunscreen application and reapplication. Skin cancer is by far the most common malignancy in Caucasian populations, and additional strategies to reduce the morbidity and economic burden of this disease are now urgently needed. Nicotinamide, the amide form of vitamin B3, is an inexpensive agent which is used for a variety of dermatological applications with little or no toxicity even at high doses. Nicotinamide has photoprotective effects against carcinogenesis and immune suppression in mice, and is photoimmunoprotective in humans when used as a lotion or orally. UV irradiation depletes keratinocytes of cellular energy and nicotinamide, which is a precursor of nicotinamide adenine dinucleotide, may act at least in part by providing energy repletion to irradiated cells.
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Affiliation(s)
- Diona L Damian
- Dermatology, Gloucester House Level 3, University of Sydney at Royal Prince Alfred Hospital Camperdown, NSW, 2050, Australia.
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Matthews YJ, Halliday GM, Phan TA, Damian DL. A UVB Wavelength Dependency for Local Suppression of Recall Immunity in Humans Demonstrates a Peak at 300nm. J Invest Dermatol 2010; 130:1680-4. [DOI: 10.1038/jid.2010.27] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Park J, Halliday GM, Surjana D, Damian DL. Nicotinamide prevents ultraviolet radiation-induced cellular energy loss. Photochem Photobiol 2010; 86:942-8. [PMID: 20492562 DOI: 10.1111/j.1751-1097.2010.00746.x] [Citation(s) in RCA: 85] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
UV radiation is carcinogenic by causing mutations in the skin and also by suppressing cutaneous antitumor immunity. We previously found nicotinamide (vitamin B3) to be highly effective at reducing UV-induced immunosuppression in human volunteers, with microarray studies on in vivo irradiated human skin suggesting that nicotinamide normalizes subsets of apoptosis, immune function and energy metabolism-related genes that are downregulated by UV exposure. Using human adult low calcium temperature keratinocytes, we further investigated nicotinamide's effects on cellular energy metabolism. We found that nicotinamide prevented UV-induced cellular ATP loss and protected against UV-induced glycolytic blockade. To determine whether nicotinamide alters the effects of UV-induced oxidative stress posttranslationally, we also measured UV-induced reactive oxygen species (ROS). Nicotinamide had no effect on ROS formation, and at the low UV doses used in these studies, equivalent to ambient daily sun exposure, there was no evidence of apoptosis. Hence, nicotinamide appears to exert its UV protective effects on the skin via its role in cellular energy pathways.
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Affiliation(s)
- Joohong Park
- Discipline of Dermatology, Bosch Institute, Sydney Cancer Centre at Royal Prince Alfred Hospital, University of Sydney, Camperdown, New South Wales, Australia
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Abstract
The Sun Protection Factor (SPF) is a very popular instrument in the marketing of sunscreens. Unfortunately it is often not understood how sunscreens work and where the limitations of the SPF are. A lot of aspects of the SPF are confusing, e.g. the race for higher and higher numbers, the effect on SPF when less sunscreen is applied and if sunscreen should be used at all because they may block the Vitamin D synthesis. All this has a negative impact on compliance by the consumer or patient which is the most important influence factor in sun protection. This paper explains how sunscreens work, how the SPF is determined and where the limitations of the current methods exist. The dynamic view of 'UV radiation applied' and the 'UV dose transmitted' through the sunscreen onto the skin as well as onto a substrate in vitro help in the understanding and are also promising approaches in the in vitro assessment. A variation of the in vitro assessment of a sunscreen is the in silico calculation based on the absorption spectrum of the UV filters and an assumption about the irregular sunscreen film on the skin. The sunscreen simulator program can be used to determine how the SPF is affected by applying smaller amounts of sunscreen. Besides the SPF, UVA protection is also discussed. The degree of UVA protection determines the quality of the overall UV protection, whereas the SPF is an indication of the quantity of protection. Furthermore other protection factors such as IPF, iSPF, RSF and p53, and the inhibition of the Vitamin D3 synthesis by sunscreens are also discussed. In conclusion it is shown that the accuracy and robustness of the SPF and other Protection Factors will improve significantly with the availability of true broad-spectrum sunscreens rather than conventional UVB-biased sunscreens, because uniform protection profiles lead to protection independent of the action spectrum of the endpoint and the UV-radiation source.
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Abstract
We proposed the term photoeducation in 1988(1) to integrate the basic concepts of sun protection in one word: why, how, when, and how much one should protect the skin from the harmful effects of ultraviolet radiation (UVR). Subsequent use of the word expanded the concept further, emphasizing the positive and negative role of sunlight in man and nature.
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Affiliation(s)
- Fernando M Stengel
- Department of Dermatology, Cemic Medical Institute, Buenos Aires, Argentina.
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Sivapirabu G, Yiasemides E, Halliday G, Park J, Damian D. Topical nicotinamide modulates cellular energy metabolism and provides broad-spectrum protection against ultraviolet radiation-induced immunosuppression in humans. Br J Dermatol 2009; 161:1357-64. [DOI: 10.1111/j.1365-2133.2009.09244.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Nahar J, Tickle KS, Ali ABMS, Chen YPP. Significant Cancer Prevention Factor Extraction: An Association Rule Discovery Approach. J Med Syst 2009; 35:353-67. [DOI: 10.1007/s10916-009-9372-8] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2009] [Accepted: 08/24/2009] [Indexed: 01/24/2023]
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Camouse MM, Domingo DS, Swain FR, Conrad EP, Matsui MS, Maes D, Declercq L, Cooper KD, Stevens SR, Baron ED. Topical application of green and white tea extracts provides protection from solar-simulated ultraviolet light in human skin. Exp Dermatol 2009; 18:522-6. [PMID: 19492999 DOI: 10.1111/j.1600-0625.2008.00818.x] [Citation(s) in RCA: 76] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND Tea polyphenols have been found to exert beneficial effects on the skin via their antioxidant properties. AIMS We sought to determine whether topical application of green tea or white tea extracts would prevent simulated solar radiation-induced oxidative damages to DNA and Langerhans cells that may lead to immune suppression and carcinogenesis. METHODS Skin samples were analysed from volunteers or skin explants treated with white tea or green tea after UV irradiation. In another group of patients, the in vivo immune protective effects of green and white tea were evaluated using contact hypersensitivity to dinitrochlorobenzene. RESULTS Topical application of green and white tea offered protection against detrimental effects of UV on cutaneous immunity. Such protection is not because of direct UV absorption or sunscreen effects as both products showed a sun protection factor of 1. There was no significant difference in the levels of protection afforded by the two agents. Hence, both green tea and white tea are potential photoprotective agents that may be used in conjunction with established methods of sun protection.
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Affiliation(s)
- Melissa M Camouse
- Department of Dermatology, University Hospitals Case Medical Center Cleveland, OH 44106, USA
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Yiasemides E, Sivapirabu G, Halliday GM, Park J, Damian DL. Oral nicotinamide protects against ultraviolet radiation-induced immunosuppression in humans. Carcinogenesis 2008; 30:101-5. [DOI: 10.1093/carcin/bgn248] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
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Halliday GM, Norval M, Byrne SN, Huang XX, Wolf P. The effects of sunlight on the skin. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.ddmec.2008.04.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Halliday GM, Rana S. Waveband and dose dependency of sunlight-induced immunomodulation and cellular changes. Photochem Photobiol 2008; 84:35-46. [PMID: 18173699 DOI: 10.1111/j.1751-1097.2007.00212.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Both the UVB and UVA wavebands within sunlight are immunosuppressive. This article reviews the relationship between wavebands and dose in UV-induced immunosuppression mainly concentrating on responses in humans. It also contrasts the effects of UVB and UVA on cellular changes involved in immunosuppression. Over physiological sunlight doses to which humans can be exposed during routine daily living or recreational pursuits, both UVA and UVB suppress immunity. While there is a linear dose relationship with UVB commencing at doses less than half of what is required to cause sunburn, UVA has a bell-shaped dose response over the range to which humans can be realistically exposed. At doses too low for either waveband to be suppressive, interactions between UVA and UVB augment each other, enabling immunosuppression to occur. At doses beyond where UVA is immunosuppressive, it still contributes to sunlight-induced immunosuppression via this interaction with UVB. While there is little research comparing the mechanisms by which UVB, UVA and their interactions can cause immunosuppression, it is likely that different chromophores and early molecular events are involved. There is evidence that both wavebands disrupt antigen presentation and effect T cell responses. Different individuals are likely to have different immunomodulatory responses to sunlight.
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Affiliation(s)
- Gary M Halliday
- Dermatology Research Laboratories, Melanoma and Skin Cancer Research Institute and Bosch Institute, University of Sydney, Sydney, NSW, Australia.
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35
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Damian DL, Patterson CRS, Stapelberg M, Park J, Barnetson RSC, Halliday GM. UV radiation-induced immunosuppression is greater in men and prevented by topical nicotinamide. J Invest Dermatol 2007; 128:447-54. [PMID: 17882270 DOI: 10.1038/sj.jid.5701058] [Citation(s) in RCA: 146] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
UV radiation-induced immunosuppression augments cutaneous carcinogenesis. The incidence of skin cancer continues to increase despite increased use of sunscreens, which are less effective at preventing immunosuppression than sunburn. Using the Mantoux reaction as a model of skin immunity, we investigated the effects of solar-simulated (ss) UV and its component UVA and UVB wavebands and tested the ability of topical nicotinamide to protect from UV-induced immunosuppression. Healthy, Mantoux-positive volunteers were UV-irradiated on their backs, with 5% nicotinamide or vehicle applied to different sites in a randomized, double-blinded manner. Subsequent Mantoux testing at irradiated and adjacent unirradiated sites enabled measurement of UV-induced immunosuppression with and without nicotinamide. Suberythemal ssUV caused significant immunosuppression, although component UVB and UVA doses delivered independently did not. Men were immunosuppressed by ssUV doses three times lower than those required to immunosuppress women. This may be an important cause of the higher skin cancer incidence and mortality observed in men. Topical nicotinamide prevented immunosuppression, with gene chip microarrays suggesting that the mechanisms of protection may include alterations in complement, energy metabolism and apoptosis pathways. Nicotinamide is a safe and inexpensive compound that could be added to sunscreens or after-sun lotions to improve protection from immunosuppression. immunosuppression.JID JOURNAL CLUB ARTICLE: For questions, answers, and open discussion about this article, please go to http://network.nature.com/group/jidclub
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Affiliation(s)
- Diona L Damian
- Department of Dermatology, Melanoma and Skin Cancer Research Institute, Sydney Cancer Centre, University of Sydney, Royal Prince Alfred Hospital, Camperdown, New South Wales, Australia.
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Ullrich SE, Nghiem DX, Khaskina P. Suppression of an established immune response by UVA--a critical role for mast cells. Photochem Photobiol 2007; 83:1095-100. [PMID: 17880504 PMCID: PMC2515596 DOI: 10.1111/j.1751-1097.2007.00184.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Exposing experimental animals or human volunteers to UVA II (320-340 nm) radiation after immunization suppresses immunologic memory and the elicitation of delayed-in-time hypersensitivity reactions. Previous studies indicated that the mechanisms underlying UVA-induced immune suppression are similar to those described for UVB-induced immune suppression, i.e. transferred by T regulatory cells, overcome by repairing DNA damage, neutralizing interleukin (IL)-10 activity, or injecting recombinant IL-12. Here we continued our examination of the mechanisms involved in UVA II-induced suppression. Antibodies to cis-urocanic acid blocked UVA-induced immune suppression. Treating UVA-irradiated mice with histamine receptor antagonists, calcitonin gene-related peptide (CGRP) receptor antagonists or platelet activating factor receptor antagonists blocked immune suppression in UVA-irradiated mice. In light of the fact that cis-urocanic acid and CGRP target mast cells, which can then release platelet activating factor and histamine, we measured UVA-induced immune suppression in mast cell-deficient mice. No immune suppression was noted in UVA-irradiated mast cell-deficient mice. These findings indicate that exposure to UVA II activates many of the same immune regulatory factors activated by UVB to induce immune suppression. Moreover, they indicate that mast cells play a critical role in UVA-induced suppression of secondary immune reactions.
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Affiliation(s)
- Stephen E Ullrich
- Department of Immunology and the Center for Cancer Immunology Research, University of Texas MD Anderson Cancer Center, Houston, TX, USA.
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37
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Holmes C, Foley P, Freeman M, Chong AH. Solar keratosis: epidemiology, pathogenesis, presentation and treatment. Australas J Dermatol 2007; 48:67-74; quiz 75-6. [PMID: 17535191 DOI: 10.1111/j.1440-0960.2007.00339.x] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Solar keratosis is a common problem encountered by dermatologists, particularly in Australia. Solar keratosis is most commonly found on sun-exposed areas such as the scalp, face and forearms. UV radiation is thought to be the major aetiological factor, with age, immunosuppression and human papillomavirus being important contributing factors. Solar keratosis usually presents as a discrete, variably erythematous and irregular lesion with a scaly surface. Although the exact rate of malignant transformation to squamous cell carcinoma is unknown, the majority of squamous cell carcinomas appear to arise from within solar keratosis. For this reason, solar keratosis is commonly treated and, consequently, an increasing number of therapeutic options is now available. Traditional therapies, such as liquid nitrogen cryotherapy, are still popular, but newer choices, such as photodynamic therapy and imiquimod cream, are now providing further options with similar efficacy and superior adverse effect profiles, albeit at a higher cost.
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Affiliation(s)
- Cara Holmes
- Skin and Cancer Foundation, Carlton, Australia.
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38
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Stoebner PE, Poosti R, Djoukelfit K, Martinez J, Meunier L. Decreased human epidermal antigen-presenting cell activity after ultraviolet A exposure: dose–response effects and protection by sunscreens. Br J Dermatol 2007; 156:1315-20. [PMID: 17535231 DOI: 10.1111/j.1365-2133.2007.07895.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND Ultraviolet (UV) exposure of human skin causes immunosuppression that contributes to the growth of skin cancer. The contribution of UVA in these processes is still a matter of debate. OBJECTIVES The purpose of our study was first to find a dose-response effect of UVA exposure on human epidermal antigen-presenting cell (APC) activity and to evaluate the protective capacity of two sunscreen formulations against a high level of acute UVA exposure. We also tried to evaluate the protective capacity afforded by the same sunscreens against UVA-induced clinical changes such as redness and pigmentation. METHODS The functional assessment of the alloantigen-presenting capacity of epidermal cells prepared from skin keratotome samples 3 days after UVA exposure was measured with a mixed epidermal cell-lymphocyte reaction (MECLR) in each healthy volunteer (n = 16). Redness and pigmentation were assessed by chromametry 24 h after exposure to a single UVA dose. RESULTS In vivo UVA exposure to 15, 30 and 60 J cm(-2) resulted in a dose-dependent decrease in purified allogeneic T cell (CD4+ T cells) proliferation induced by UVA-irradiated epidermal cells. The epidermal APC function was significantly decreased with a suberythemal exposure corresponding to 15 J cm(-2). The decrease, partial and not statistically different between 30 and 60 J cm(-2), exhibits a plateau-response effect. There was no correlation between the decrease of the epidermal APC function and the intensity of erythema and persistent pigment darkening. Both sunscreen formulations strongly inhibited the UVA-induced reduction of MECLR at 90 J cm(-2). CONCLUSION Our results clearly demonstrate that UVA impairs the APC activity of the epidermal cells and thus may contribute to UV-induced immunosuppression in humans. They also indicate that erythema and immunosuppression have different dose-response curves in the UVA range. The two sunscreen formulations afforded a significant protection against the decrease in epidermal APC activity induced by exposure to a high UVA dose (90 J cm(-2)).
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Affiliation(s)
- P E Stoebner
- Service de Dermatologie, CHU Caremeau, Place du Pr. Debre, 30029 Nîmes cedex 09, France
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Friedmann AC, Halliday GM, Barnetson RS, Reeve VE, Walker C, Patterson CRS, Damian DL. The Topical Isoflavonoid NV-07α Reduces Solar-simulated UV-induced Suppression of Mantoux Reactions in Humans¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2004.tb00107.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Friedmann AC, Halliday GM, Barnetson RS, Reeve VE, Walker C, Patterson CRS, Damian DL. The topical isoflavonoid NV-07alpha reduces solar-simulated UV-induced suppression of Mantoux reactions in humans. Photochem Photobiol 2006; 80:416-21. [PMID: 15623323 DOI: 10.1562/0031-8655(2004)080<0416:ttinrs>2.0.co;2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
UV radiation suppresses delayed-type hypersensitivity responses to intradermally injected tuberculin purified protein derivative in Mantoux-positive individuals. The effect of the topically administered isoflavonoid NV-07alpha, a synthetic derivative of the isoflavonoid equol, on UV-induced suppression of Mantoux reactions was assessed in 18 healthy Mantoux-positive volunteers. A single, fixed dose of solar-simulated UV radiation was delivered to the volunteers' lower backs. Different concentrations of NV-07alpha or its vehicle were applied to different sites within the irradiated field immediately after UV exposure and again 24 h later. Forty-eight hours after irradiation, Mantoux testing was performed at both the irradiated sites and adjacent, unirradiated sites. The intensity of Mantoux reactions was measured 72 h later with a reflectance erythema meter and by measuring the diameter of each reaction. Although lower concentrations of NV-07alpha (0.5 and 2 mM) did not prevent UV immunosuppression, 4 mM NV-07alpha partially but significantly attenuated UV-induced suppression of Mantoux-induced erythema. Minimal erythema doses were also determined for sites treated with NV-07alpha or its vehicle immediately after UV exposure. NV-07alpha had no significant effects on UV erythema. We conclude that 4 mM NV-07alpha prevented the suppressive effects of UV radiation on Mantoux responses in humans but did not affect UV-induced erythema at the concentrations used.
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Affiliation(s)
- Adam C Friedmann
- Dermatology, Melanoma and Skin Cancer Research Institute, Sydney Cancer Centre, University of Sydney at Royal Prince Alfred Hospital, New South Wales, Australia
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Tyrrell RM, Reeve VE. Potential protection of skin by acute UVA irradiation—From cellular to animal models. PROGRESS IN BIOPHYSICS AND MOLECULAR BIOLOGY 2006; 92:86-91. [PMID: 16620921 DOI: 10.1016/j.pbiomolbio.2006.02.002] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The UVA (320-380 nm) component of sunlight has oxidizing properties which may be deleterious to skin cells and tissue but can also lead to the strong up-regulation of the heme-catabolizing enzyme, heme oxygenase-1. This enzyme has well-established antioxidant actions in cells as well as anti-inflammatory properties in mammals. There is also evidence from rodent models that this enzyme is responsible for the UVA-mediated protection against UVB-induced immunosuppression that occurs in skin. The relevance of these findings to acute and chronic effects of sunlight including skin carcinogenesis is currently under investigation as are the potential implications for sunlight protection in humans.
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Affiliation(s)
- R M Tyrrell
- Department of Pharmacy and Pharmacology University of Bath, BA2 7AY, UK.
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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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Furio L, Berthier-Vergnes O, Ducarre B, Schmitt D, Peguet-Navarro J. UVA Radiation Impairs Phenotypic and Functional Maturation of Human Dermal Dendritic Cells. J Invest Dermatol 2005; 125:1032-8. [PMID: 16297206 DOI: 10.1111/j.0022-202x.2005.23904.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
There is now strong evidence that the ultraviolet A (UVA) part of the solar spectrum contributes to the development of skin cancers. Its effect on the skin immune system, however, has not been fully investigated. Here, we analyzed the effects of UVA radiation on dermal dendritic cells (DDC), which, in addition, provided further characterization of these cells. Dermal sheets were obtained from normal human skin and irradiated, or not, with UVA at 2 or 12 J per cm2. After a 2 d incubation, the phenotype of emigrant cells was analyzed by double immunostaining and flow cytometry. Results showed that migratory DDC were best characterized by CD1c expression and that only few cells co-expressed the Langerhans cell marker Langerin. Whereas the DC extracted from the dermis displayed an immature phenotype, emigrant DDC showed increased expression of HLA-DR and acquired co-stimulation and maturation markers. We showed here that UVA significantly decreased the number of viable emigrant DDC, a process related to increased apoptosis. Furthermore, UVA irradiation impaired the phenotypic and functional maturation of migrating DDC into potent antigen-presenting cells, in a concentration-dependent manner. The results provide further evidence that UVA are immunosuppressive and suggest an additional mechanism by which solar radiation impairs immune response.
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Affiliation(s)
- Laetitia Furio
- Université Claude Bernard Lyon1, Laboratoire EA 37-32, Clinique Dermatologique, Pavillon R, Hôpital E. Herriot, Lyon, France
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Poon TSC, Barnetson RSC, Halliday GM. Sunlight-Induced Immunosuppression in Humans Is Initially Because of UVB, Then UVA, Followed by Interactive Effects. J Invest Dermatol 2005; 125:840-6. [PMID: 16185286 DOI: 10.1111/j.0022-202x.2005.23894.x] [Citation(s) in RCA: 67] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Solar-simulated ultraviolet radiation (ssUV) suppresses immunity in humans. The ultraviolet B (UVB) waveband is recognized as immunosuppressive; however the relative significance of UVA to ssUV immunosuppression is unknown. We created dose and time-response curves for UVB-, UVA-, and ssUV-induced suppression of memory immunity to nickel in humans. UVB caused immunosuppression within 24 h. UVA immunosuppression required 48 h and was normalized by 72 h. UVB alone accounts for ssUV immunosuppression at 24 h, but both UVB and UVA contributed at 48 h. By 72 h neither waveband accounted for ssUV immunosuppression. An interaction between these wavebands was therefore the major contributor. To confirm this dose-response curves were used to determine immune protection factors (IPF) for sunscreens with nickel challenge 72 h following ssUV. A sunscreen with good UVA protection had an IPF twice that of a poor UVA protector, despite providing similar protection from sunburn. Thus UVA was a major contributor to ssUV-induced immunosuppression at 72 h but only with the cooperation of UVB. Hence, UVB initiates immunosuppressive signals within 24 h, followed by UVA at 48 h, then an interaction between UVB and UVA. By 72 h following ssUV exposure, neither UVB nor UVA, but an interaction between them is the major cause of sunlight-induced immunosuppression.
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Affiliation(s)
- Terence S C Poon
- Discipline of Medicine (Dermatology), Melanoma and Skin Cancer Research Institute, Sydney Cancer Centre, Royal Prince Alfred Hospital at the University of Sydney, Sydney, NSW, Australia
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Fourtanier A, Moyal D, Maccario J, Compan D, Wolf P, Quehenberger F, Cooper K, Baron E, Halliday G, Poon T, Seed P, Walker SL, Young AR. Measurement of Sunscreen Immune Protection Factors in Humans: A Consensus Paper. J Invest Dermatol 2005; 125:403-9. [PMID: 16117779 DOI: 10.1111/j.0022-202x.2005.23857.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
It is increasingly accepted that sunscreens should protect against ultraviolet radiation (UVR)-induced immunosuppression, with an index of protection that can be compared with the sun protection factor (SPF). Five groups of immunoprotection researchers met to discuss the status of immune protection factor (IPF) evaluation in human skin in vivo. Current methods rely on a suncreen's inhibition of UVR-induced local suppression of the contact hypersensitivity (CHS) response or the delayed-type hypersensitivity (DTH) response, using either the induction or the elicitation arms of these responses. The induction arm of the CHS response has the advantage of being sensitive to a single sub-erythemal exposure of solar-simulating radiation (SSR) that allows a direct comparison with the SPF. This approach, which necessitates sensitization, requires a large number of volunteers and is too labor intensive and time consuming to become a routine method. The elicitation arm of the CHS or DTH responses exploits prior sensitization to contact or recall antigens and has the advantage of being possible to apply on small groups of volunteers. Some current protocols, however, require repeat SSR exposures, which invalidates a direct comparison with SPF that is based on a single exposure. There is a need for a new simpler method of IPF that will have to be validated against existing models.
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Abstract
UNLABELLED Many agents affect the transmission of ultraviolet light to human skin. These include naturally occurring photoprotective agents (ozone, pollutants, clouds, and fog), naturally occurring biologic agents (epidermal chromophores), physical photoprotective agents (clothing, hats, make-ups, sunglasses, and window glass), and ultraviolet light filters (sunscreen ingredients and sunless tanning agents). In addition, there are agents that can modulate the effects of ultraviolet light on the skin (antioxidants and others). All of the above are reviewed in this article. LEARNING OBJECTIVE At the conclusion of this learning activity, participants should be able to provide an overview of all aspects of photoprotection.
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McLoone P, Simics E, Barton A, Norval M, Gibbs NK. An Action Spectrum for the Production of cis-Urocanic Acid in Human Skin In Vivo. J Invest Dermatol 2005; 124:1071-4. [PMID: 15854050 DOI: 10.1111/j.0022-202x.2005.23731.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Urocanic acid (UCA) is present at millimolar concentrations in mammalian epidermis and undergoes photoisomerization from the naturally occurring trans-isomer to the cis-isomer on exposure to ultraviolet radiation (UVR). Cis-UCA causes downregulation of various immune responses in mouse and human experimental models and has been proposed as both a chromophore and a mediator of UV-induced immune suppression. In this study, the wavelength dependence from 260-340 nm for trans to cis-UCA photoisomerization in human skin was analyzed in five healthy volunteers. The resulting action spectrum demonstrated maximal cis-UCA production in the UVB spectral region of 280-310 nm. This spectral peak is red-shifted to longer wavelengths compared with the erythemal action spectrum. The cis-UCA action spectrum can be used to predict the ability of sunscreens to protect against UVR-induced cis-UCA formation and may assist in explaining discrepancies between sunscreens' abilities to protect against erythema and photoimmunosuppression.
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Affiliation(s)
- Pauline McLoone
- Medical Microbiology, University of Edinburgh, Edinburgh, UK
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Hofmann-Wellenhof R, Smolle J, Roschger A, Strunk D, Hubmer M, Hoffmann C, Quehenberger F, Horn M, Kerl H, Wolf P. Sunburn Cell Formation, Dendritic Cell Migration, and Immunomodulatory Factor Production After Solar-Simulated Irradiation of Sunscreen-Treated Human Skin Explants In Vitro. J Invest Dermatol 2004; 123:781-7. [PMID: 15373785 DOI: 10.1111/j.0022-202x.2004.23322.x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Using human skin explants, we investigated the effects of two different sunscreen preparations containing a chemical UVB filter alone [sun protection factor (SPF) 5.2] or UVA+UVB filter [SPF 6.2] on sunburn cell formation, dendritic cell (DC) migration, CD86- and CD1a-positive cell number, and tumor necrosis factor alpha (TNFalpha) and interleukin (IL)-1, IL-10, and IL-12 production in the skin after irradiation with different doses of solar-simulated UV radiation. Sunscreen- or placebo-treated skin explants were irradiated with solar-simulated UV radiation at 0.5, 1, and 2 minimal erythematous dose equivalents (MEDE) (as determined in an in vivo human study) multiplied by the SPF of the placebo or sunscreens. After irradiation, skin explants were floated on RMPI medium for 48 h. Cells that had emigrated and the skin explants were histologically analyzed, and the soluble mediators were measured in the supernatants by ELISA. Exposure to UV radiation led to concentration-dependent increases in sunburn cell formation and TNFalpha production but a concentration-dependent decrease in DC migration and CD86- and CD1a-positive cell number in the epidermis. Both chemical sunscreens protected against those alterations. The immunoprotective capacity of the sunscreens correlated with their SPF but was independent of the sunscreens' UVA protection capacity, suggesting that UVA is not a major factor for immunosuppression under the conditions used in the model. UV irradiation did not significantly affect the vitality of emigrated DC; the expression of HLA, CD80, and lag on emigrated cells; the number of CD1a-positive cells in the dermis; or the production of IL-1, IL-10, and IL-12. We conclude that our model may be useful in determining the immunoprotective capacity of sunscreens.
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Herzinger T, Plewig G, Röcken M. Use of sunscreens to protect against ultraviolet-induced lupus erythematosus. ACTA ACUST UNITED AC 2004; 50:3045-6. [PMID: 15457474 DOI: 10.1002/art.20426] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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