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Surber C, Osterwalder U. Response to "Sunscreens: Misconceptions and Misinformation". J Invest Dermatol 2024; 144:1175-1177. [PMID: 38007089 DOI: 10.1016/j.jid.2023.10.024] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2023] [Accepted: 10/17/2023] [Indexed: 11/27/2023]
Affiliation(s)
- Christian Surber
- Department of Dermatology, University Hospital Basel, Basel, Switzerland; Department of Dermatology, University Hospital Zurich, Zurich, Switzerland.
| | - Uli Osterwalder
- International Organization for Standardization (ISO), Basel, Switzerland
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2
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Lee TA, Huang YT, Hsiao PF, Chiu LY, Chern SR, Wu NL. Critical roles of irradiance in the regulation of UVB-induced inflammasome activation and skin inflammation in human skin keratinocytes. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY. B, BIOLOGY 2022; 226:112373. [PMID: 34959183 DOI: 10.1016/j.jphotobiol.2021.112373] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2021] [Revised: 10/30/2021] [Accepted: 12/06/2021] [Indexed: 10/19/2022]
Abstract
UVB dosage is generally regarded as the most critical factor that determines the severity of UVB-induced skin erythema. However, recent studies have demonstrated that different UV irradiances induce varying biological responses in mouse skin even at constant UV doses. UVB-induced inflammasome activation is particularly observed in human skin keratinocytes, which are classified as immunocompetent cells, but not in mouse skin keratinocytes, which do not express sufficient inflammasome complex components. In human skin UVB-induced sunburn reactions, NLRP1 inflammasome activation critically mediates the inflammatory responses. Here, we employed primary human skin keratinocytes to explore the impact of different irradiances of a constant UVB dosage on inflammasome activation and related inflammatory responses. Our findings indicated that low-irradiance UVB induced relatively stronger NLRP1 inflammasome activation, which manifested as more active IL-1β, IL-18 release, and enhanced procaspase-1 cleavage compared to high-irradiance UVB at the same dose. Irradiance did not influence cell lysis or the expression of inflammasome complex proteins including NLRP1, proIL-1β, proIL-18, procaspase-1, and ASC. The UVB-induced TNF-α and cyclooxygenase-2 expression was also relatively higher in keratinocytes exposed to low-irradiance UVB. Low-irradiance UVB also increased reactive oxygen species production. UVB-triggered signaling analysis revealed that low-irradiance UVB resulted in more prominent p38 and JNK activation. Therefore, our findings indicated that, in addition to the role of total dosage, irradiance crucially modulates UVB-elicited inflammation in human skin keratinocytes, thus providing novel insights into human skin photobiology.
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Affiliation(s)
- Te-An Lee
- Department of Urology, Hsinchu MacKay Memorial Hospital, Hsinchu, Taiwan.
| | - Yi-Ting Huang
- Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan; Department of Medicine, MacKay Medical College, New Taipei City, Taiwan.
| | - Pa-Fan Hsiao
- Department of Medicine, MacKay Medical College, New Taipei City, Taiwan; Department of Dermatology, MacKay Memorial Hospital, Taipei, Taiwan; MacKay Junior College of Medicine, Nursing, and Management.
| | - Ling-Ya Chiu
- Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan; Department of Pharmacology, College of Medicine, National Taiwan University, Taipei, Taiwan.
| | - Schu-Rern Chern
- Department of Medical Research, MacKay Memorial Hospital, Taipei, Taiwan.
| | - Nan-Lin Wu
- Department of Medicine, MacKay Medical College, New Taipei City, Taiwan; Department of Dermatology, MacKay Memorial Hospital, Taipei, Taiwan; MacKay Junior College of Medicine, Nursing, and Management; Institute of Biomedical Sciences, Mackay Medical College, New Taipei City, Taiwan.
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3
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The effects of UVB irradiance on aberrant epidermal proliferation: Novel insights on how to improve currently available sunscreens. Life Sci 2022; 288:120181. [PMID: 34843737 DOI: 10.1016/j.lfs.2021.120181] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2021] [Revised: 11/12/2021] [Accepted: 11/21/2021] [Indexed: 11/23/2022]
Abstract
AIMS Sunscreen use, which prolonged the time required to develop sunburn by reducing the irradiance (mW/cm2) of the UVB radiation, is thought to protect the skin from developing cancers. Recently, in addition to fluence (mJ/cm2), irradiance of the UVB radiation was demonstrated to play an important role leading to photocarcinogenesis of the skin. After equivalent fluence of UVB exposure, enhanced aberrant keratinocyte proliferation contributes significantly to the photocarcinogenic capacity of low irradiance (LI) UVB as compared to its high irradiance (HI) UVB counterpart. However, the mechanism involved remains unclear. MAIN METHODS Relevant cell and animal models were employed to investigate the effects of equivalent UVB fluence administered at HI or LI on keratinocyte proliferation. Additionally, the mechanisms involved were also explored. KEY FINDINGS We found that at equivalent fluence, LIUVB induces significantly higher reactive oxidative species (ROS) production, cell proliferation, as well as phosphorylated AKT (pAKT) expression in both cell and animal models as compare to its HIUVB counterpart. Pretreating cultured keratinocytes with antioxidant or AKT inhibitor significantly reduced the UVB-induced ROS, cell proliferation, and pAKT expression. Additionally, these pretreatments abrogate the difference between the LI and HIUVB treated keratinocytes. Similar findings were noted using animal model treated with AKT inhibitor. SIGNIFICANCE In summary, at equivalent fluence, LIUVB induces significantly more aberrant epidermal proliferation via enhanced ROS and pAKT signaling. Reducing UVB-induced AKT phosphorylation presents a novel strategy to improve the protective capacity of the currently available sunscreens.
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Iida M, Tazaki A, Deng Y, Chen W, Yajima I, Kondo-Ida L, Hashimoto K, Ohgami N, Kato M. A unique system that can sensitively assess the risk of chemical leukoderma by using murine tail skin. CHEMOSPHERE 2019; 235:713-718. [PMID: 31279121 DOI: 10.1016/j.chemosphere.2019.06.185] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 06/18/2019] [Accepted: 06/24/2019] [Indexed: 06/09/2023]
Abstract
Chemical leukoderma is a patchy hypopigmentation in the skin. Phenol derivatives such as raspberry ketone have been reported to cause the development of occupationally induced leukoderma. Recently, 2% (w/w) rhododenol, a reduced form of raspberry ketone used in a skin-lightning agent, also caused the development of leukoderma in >16,000 users, about 2% of all users, in Asian countries including Japan. However, a method for assessing the risk of leukoderma caused by 2% rhododenol has not been established despite the fact that the development of leukoderma caused by 30% rhododenol was previously shown in animal experiments. Establishment of a novel technique for risk assessment of leukoderma in humans caused by external treatment with chemicals is needed to prevent a possible future chemical disaster. This study demonstrated that external treatment with 2% rhododenol and the same concentration of raspberry ketone caused the development of leukoderma in murine tail skin without exception with significant decreases in the amount of melanin and number of melanocytes in the epidermis. Thus, a novel in vivo technique that can assess the risk of leukoderma caused by 2% rhododenol was developed. The unique technique using tail skin has the potential to prevent chemical leukoderma in the future.
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Affiliation(s)
- Machiko Iida
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Akira Tazaki
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Yuqi Deng
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Wei Chen
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Ichiro Yajima
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Lisa Kondo-Ida
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Kazunori Hashimoto
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Nobutaka Ohgami
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan
| | - Masashi Kato
- Department of Occupational and Environmental Health, Nagoya University Graduate School of Medicine, 65 Tsurumai-cho, Showa-ku, Nagoya, Aichi, 466-8550, Japan.
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Lan CCE, Hung YT, Fang AH, Ching-Shuang W. Effects of irradiance on UVA-induced skin aging. J Dermatol Sci 2019; 94:220-228. [PMID: 30956032 DOI: 10.1016/j.jdermsci.2019.03.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Revised: 03/22/2019] [Accepted: 03/24/2019] [Indexed: 10/27/2022]
Abstract
BACKGROUND Ultraviolet A (UVA) radiation is the most relevant component of solar radiation-induced skin aging. Sunscreens were used to minimize the harmful effects of UV radiation on our skin by reducing UV irradiance. We previously found that at equivalent fluence, UVB radiation at low irradiance (LI) has higher photocarcinogenic potential as compared to its high irradiance (HI) counterpart. OBJECTIVES To examine the effects of equivalent fluence of UVA radiation administered at different irradiance on photoaging. METHODS Both the hairless mice (SKH-1) and human dermal fibroblasts were irradiated with high irradiance UVA (HIUVA) or low irradiance UVA (LIUVA; 50% irradiance of HIUVA) at equivalent fluence. Parameters related to skin photoaging were evaluated. RESULTS For hairless mice receiving equivalent fluence of UVA radiation, LIUVA treated mice showed prominent skin aging as compared to its HIUVA treated counterpart. In addition, LIUVA radiation induced higher reactive oxygen species (ROS) production and c-Jun N-terminal kinases (JNK) phosphorylation as compared to their HIUVA treated counterparts. Pretreatment with N-acetylcysteine (NAC) abrogate the difference between HI and LIUVA radiation on fibroblasts in terms of intracellular ROS, JNK phosphorylation, MMP-1 expression and type I collagen expression. CONCLUSION UVA radiation administered at LI (a scenario similar to sunscreen use) led to more severe aging process as compared to its HI counterpart. Unexpected negative effect may be imposed on the skin if sunscreen use is accompanied by longer duration spent under the sun.
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Affiliation(s)
- Cheng-Che E Lan
- Department of Dermatology, Kaohsiung Medical University Hospital, and College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Yu-Ting Hung
- Department of Medical Laboratory Science and Biotechnology, College of Health Science, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ai-Hui Fang
- Department of Microbiology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Wu Ching-Shuang
- Department of Medical Laboratory Science and Biotechnology, College of Health Science, Kaohsiung Medical University, Kaohsiung, Taiwan; Institute of Biomedical Sciences, National Sun Yat-Sen University, Kaohsiung, Taiwan.
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6
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Lai HC, Lin CS, Wu CS, Lan CCE. The impact of irradiance on UVB-induced cutaneous immunosuppression: Implications on administering most efficient phototherapy. J Dermatol Sci 2019; 93:116-122. [PMID: 30709685 DOI: 10.1016/j.jdermsci.2019.01.003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 12/26/2018] [Accepted: 01/08/2019] [Indexed: 01/01/2023]
Abstract
BACKGROUND Ultraviolet B (UVB) is commonly used for treating dermatologic conditions. Recently, high irradiance UVB (HIUVB) has been suggested to be more effective for treating skin conditions as compared to its low irradiance (LI) counterpart. The biological impact of UVB radiation emitted at different irradiance on cutaneous immunity remains obscure. OBJECTIVE This study aimed to explore the impacts of UVB radiation administered at equivalent fluence (mJ/cm2) but different irradiance (mW/cm2) on cutaneous immune response. METHODS Cultured bone marrow derived dendritic cell (BMDC) were treated with equivalent fluence of UVB radiation with HIUVB or LIUVB. The phenotypic and functional alterations of BMDCs were documented. Animal models were used to validate the in vitro results in vivo and explore the mechanisms involved. RESULTS After equivalent fluence of UVB radiation, the HIUVB treated BMDC showed significantly lower MHCII and CD86 expressions, reduced capacity to stimulate T cell proliferation, and enhanced activation of aryl hydrocarbon receptor (AhR)-activated genes as compared to control while their LIUVB treated counterpart showed no significant change. Using animal model, the HIUVB induced significantly higher immune suppressive effect in mice as compared to their LIUVB counterpart after equivalent fluence of UVB treatment. The superior immune suppressive effect of HIUVB over LIUVB radiation was not observed when similar experiments were performed using AhR-deficient mice. CONCLUSION We propose irradiance played an important role modulating UVB-induced cutaneous immune suppression. Future works on UVB phototherapy, both clinical and research, should incorporate this important parameter into consideration.
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Affiliation(s)
- Hsiao-Chi Lai
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Chang-Shen Lin
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Ching-Shuang Wu
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Cheng-Che E Lan
- Graduate Institute of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Dermatology, Kaohsiung Medical University Hospital and Department of Dermatology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.
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Ferguson B, Handoko HY, Mukhopadhyay P, Chitsazan A, Balmer L, Morahan G, Walker GJ. Different genetic mechanisms mediate spontaneous versus UVR-induced malignant melanoma. eLife 2019; 8:e42424. [PMID: 30681412 PMCID: PMC6428585 DOI: 10.7554/elife.42424] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 01/25/2019] [Indexed: 12/23/2022] Open
Abstract
Genetic variation conferring resistance and susceptibility to carcinogen-induced tumorigenesis is frequently studied in mice. We have now turned this idea to melanoma using the collaborative cross (CC), a resource of mouse strains designed to discover genes for complex diseases. We studied melanoma-prone transgenic progeny across seventy CC genetic backgrounds. We mapped a strong quantitative trait locus for rapid onset spontaneous melanoma onset to Prkdc, a gene involved in detection and repair of DNA damage. In contrast, rapid onset UVR-induced melanoma was linked to the ribosomal subunit gene Rrp15. Ribosome biogenesis was upregulated in skin shortly after UVR exposure. Mechanistically, variation in the 'usual suspects' by which UVR may exacerbate melanoma, defective DNA repair, melanocyte proliferation, or inflammatory cell infiltration, did not explain melanoma susceptibility or resistance across the CC. Instead, events occurring soon after exposure, such as dysregulation of ribosome function, which alters many aspects of cellular metabolism, may be important.
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Affiliation(s)
- Blake Ferguson
- Drug Discovery GroupQIMR Berghofer Medical Research InstituteHerstonAustralia
| | - Herlina Y Handoko
- Drug Discovery GroupQIMR Berghofer Medical Research InstituteHerstonAustralia
| | - Pamela Mukhopadhyay
- Drug Discovery GroupQIMR Berghofer Medical Research InstituteHerstonAustralia
| | - Arash Chitsazan
- Drug Discovery GroupQIMR Berghofer Medical Research InstituteHerstonAustralia
| | - Lois Balmer
- Centre for Diabetes ResearchHarry Perkins Institute of Medical ResearchPerthAustralia
- School of Medical and Health SciencesEdith Cowan UniversityJoondalupAustralia
| | - Grant Morahan
- Centre for Diabetes ResearchHarry Perkins Institute of Medical ResearchPerthAustralia
| | - Graeme J Walker
- Drug Discovery GroupQIMR Berghofer Medical Research InstituteHerstonAustralia
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Irradiance-dependent UVB Photocarcinogenesis. Sci Rep 2016; 6:37403. [PMID: 27869214 PMCID: PMC5116611 DOI: 10.1038/srep37403] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 10/27/2016] [Indexed: 01/08/2023] Open
Abstract
Ultraviolet B (UVB) radiation from the sun may lead to photocarcinogenesis of the skin. Sunscreens were used to protect the skin by reducing UVB irradiance, but sunscreen use did not reduce sunburn episodes. It was shown that UVB-induced erythema depends on surface exposure but not irradiance of UVB. We previously showed that irradiance plays a critical role in UVB-induced cell differentiation. This study investigated the impact of irradiance on UVB-induced photocarcinogenesis. For hairless mice receiving equivalent exposure of UVB radiation, the low irradiance (LI) UVB treated mice showed more rapid tumor development, larger tumor burden, and more keratinocytes harboring mutant p53 in the epidermis as compared to their high irradiance (HI) UVB treated counterpart. Mechanistically, using cell models, we demonstrated that LI UVB radiation allowed more keratinocytes harboring DNA damages to enter cell cycle via ERK-related signaling as compared to its HI UVB counterpart. These results indicated that at equivalent exposure, UVB radiation at LI has higher photocarcinogenic potential as compared to its HI counterpart. Since erythema is the observed sunburn at moderate doses and use of sunscreen was not found to associate with reduced sunburn episodes, the biological significance of sunburn with or without sunscreen use warrants further investigation.
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