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Yancoskie M, Khaleghi R, Gururajan A, Raghunathan A, Gupta A, Diethelm S, Maritz C, Sturla S, Krishnan M, Naegeli H. ASH1L guards cis-regulatory elements against cyclobutane pyrimidine dimer induction. Nucleic Acids Res 2024; 52:8254-8270. [PMID: 38884271 PMCID: PMC11317172 DOI: 10.1093/nar/gkae517] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Revised: 05/29/2024] [Accepted: 06/04/2024] [Indexed: 06/18/2024] Open
Abstract
The histone methyltransferase ASH1L, first discovered for its role in transcription, has been shown to accelerate the removal of ultraviolet (UV) light-induced cyclobutane pyrimidine dimers (CPDs) by nucleotide excision repair. Previous reports demonstrated that CPD excision is most efficient at transcriptional regulatory elements, including enhancers, relative to other genomic sites. Therefore, we analyzed DNA damage maps in ASH1L-proficient and ASH1L-deficient cells to understand how ASH1L controls enhancer stability. This comparison showed that ASH1L protects enhancer sequences against the induction of CPDs besides stimulating repair activity. ASH1L reduces CPD formation at C-containing but not at TT dinucleotides, and no protection occurs against pyrimidine-(6,4)-pyrimidone photoproducts or cisplatin crosslinks. The diminished CPD induction extends to gene promoters but excludes retrotransposons. This guardian role against CPDs in regulatory elements is associated with the presence of H3K4me3 and H3K27ac histone marks, which are known to interact with the PHD and BRD motifs of ASH1L, respectively. Molecular dynamics simulations identified a DNA-binding AT hook of ASH1L that alters the distance and dihedral angle between neighboring C nucleotides to disfavor dimerization. The loss of this protection results in a higher frequency of C->T transitions at enhancers of skin cancers carrying ASH1L mutations compared to ASH1L-intact counterparts.
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Affiliation(s)
- Michelle N Yancoskie
- Institute of Pharmacology and Toxicology, University of Zurich-Vetsuisse, Zurich 8057, Switzerland
| | - Reihaneh Khaleghi
- Institute of Pharmacology and Toxicology, University of Zurich-Vetsuisse, Zurich 8057, Switzerland
| | - Anirvinya Gururajan
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad 500032, India
| | - Aadarsh Raghunathan
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad 500032, India
| | - Aryan Gupta
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad 500032, India
| | - Sarah Diethelm
- Institute of Pharmacology and Toxicology, University of Zurich-Vetsuisse, Zurich 8057, Switzerland
| | - Corina Maritz
- Institute of Pharmacology and Toxicology, University of Zurich-Vetsuisse, Zurich 8057, Switzerland
| | - Shana J Sturla
- Department of Health Sciences and Technology, ETH Zurich, Zurich 8092, Switzerland
| | - Marimuthu Krishnan
- Center for Computational Natural Sciences and Bioinformatics, International Institute of Information Technology, Hyderabad 500032, India
| | - Hanspeter Naegeli
- Institute of Pharmacology and Toxicology, University of Zurich-Vetsuisse, Zurich 8057, Switzerland
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Mansilla-Polo M, López-Davia J, De Unamuno-Bustos B, Martín-Torregrosa D, Abril-Pérez C, Ezzatvar Y, Botella-Estrada R. Skin cancer risk after hematopoietic stem cell transplantation: a systematic review and meta-analysis. Int J Dermatol 2024. [PMID: 38987869 DOI: 10.1111/ijd.17371] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/27/2024] [Revised: 06/19/2024] [Accepted: 06/26/2024] [Indexed: 07/12/2024]
Abstract
Hematopoietic stem cell transplantation (HSCT) has improved outcomes for severe hematologic, malignant, and immune disorders, yet poses an increased risk of subsequent malignancies. This study aimed to examine the risk of skin cancer following HSCT and identify potential risk factors. The search was conducted in MEDLINE, EMBASE, and CINAHL databases until December 2023. Cohort studies reporting standardized incidence ratios (SIRs) for post-HSCT skin cancer or investigating risk factors were included. SIRs, or hazard ratios (HRs) with 95% confidence interval (CI), were calculated using random-effects inverse-variance models. Outcome endpoints were SIRs of skin cancer post-HSCT and risk factors, including gender, chronic graft-versus-host disease (cGVHD), voriconazole exposure, and total body irradiation (TBI). Twenty-six studies involving 164,944 HSCT recipients (allogeneic HSCT, n = 68,637; autologous HSCT, n = 95,435; mean age: 38.5 ± 13.8 years; 71,354 females [43.3%]) were analyzed. Overall, SIR for skin cancer post-HSCT was 7.21 (95% CI 3.98-13.08), with SIRs of 2.25 (95% CI: 1.37-3.68) for autologous HSCT, and 10.18 (95% CI 5.07-20.43) for allogeneic HSCT. Risk factors for skin cancer risk included cGVHD (HR = 2.86 [95% CI: 2.01-4.07]), specifically for basal cell and squamous cell carcinoma (SCC) (HR = 1.80 [95% CI: 1.31-2.46] and HR = 3.68 [95% CI: 2.39-5.68], respectively), male gender (HR = 1.56 [95% CI: 1.15-2.13]), especially for SCC (HR = 1.70 [95% CI: 1.03-2.80]), and voriconazole exposure (HR = 2.01 [95% CI: 1.12-3.61]). TBI showed no statistically significant association with subsequent skin cancer (HR = 1.12 [95% CI: 0.73-1.71]). These findings highlight the importance of rigorous skin cancer surveillance and preventive strategies in HSCT recipients, particularly in male individuals undergoing allogeneic transplants and those with identifiable risk factors, to enable early detection and intervention.
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Affiliation(s)
- Miguel Mansilla-Polo
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
- Department of Dermatology, Universitat de València, Valencia, Spain
| | - Javier López-Davia
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
| | - Blanca De Unamuno-Bustos
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
| | - Daniel Martín-Torregrosa
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
| | - Carlos Abril-Pérez
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
| | - Yasmin Ezzatvar
- Department of Nursing, Universitat de València, Valencia, Spain
| | - Rafael Botella-Estrada
- Department of Dermatology, Hospital Universitario y Politécnico La Fe, Valencia, Spain
- Instituto de Investigación Sanitaria (IIS) La Fe, Valencia, Spain
- Department of Dermatology, Universitat de València, Valencia, Spain
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3
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Amador GJ, van Oorschot BK, Liao C, Wu J, Wei D. Functional fibrillar interfaces: Biological hair as inspiration across scales. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2024; 15:664-677. [PMID: 38887525 PMCID: PMC11181169 DOI: 10.3762/bjnano.15.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Accepted: 05/17/2024] [Indexed: 06/20/2024]
Abstract
Hair, or hair-like fibrillar structures, are ubiquitous in biology, from fur on the bodies of mammals, over trichomes of plants, to the mastigonemes on the flagella of single-celled organisms. While these long and slender protuberances are passive, they are multifunctional and help to mediate interactions with the environment. They provide thermal insulation, sensory information, reversible adhesion, and surface modulation (e.g., superhydrophobicity). This review will present various functions that biological hairs have been discovered to carry out, with the hairs spanning across six orders of magnitude in size, from the millimeter-thick fur of mammals down to the nanometer-thick fibrillar ultrastructures on bateriophages. The hairs are categorized according to their functions, including protection (e.g., thermal regulation and defense), locomotion, feeding, and sensing. By understanding the versatile functions of biological hairs, bio-inspired solutions may be developed across length scales.
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Affiliation(s)
- Guillermo J Amador
- Experimental Zoology Group, Department of Animal Sciences, Wageningen University & Research, De Elst 1, 6708 WD Wageningen, Netherlands
| | - Brett Klaassen van Oorschot
- Experimental Zoology Group, Department of Animal Sciences, Wageningen University & Research, De Elst 1, 6708 WD Wageningen, Netherlands
| | - Caiying Liao
- School of Aeronautics and Astronautics, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, China
| | - Jianing Wu
- School of Aeronautics and Astronautics, Shenzhen Campus of Sun Yat-sen University, Shenzhen, 518107, China
| | - Da Wei
- Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
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4
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Uyama M. Recent Progress in Hair Science and Trichology. J Oleo Sci 2024; 73:825-837. [PMID: 38825536 DOI: 10.5650/jos.ess23203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024] Open
Abstract
Hair is important to our appearance as well as to protect our heads. Human hair mainly consists of proteins (80-85%), melanin pigments (0-5%), water (10-13%), and lipids (1-6%). The physicochemical properties of hair have been studied for over 100 years. However, they are not yet thoroughly understood. In this review, recent progress and the latest findings are summarized from the following three perspectives: structural characteristics, delivery and distribution of active ingredients, and hair as a template. The structural characteristics of hair have been mainly investigated by microscopic and/or spectroscopic techniques such as atomic force microscopy integrated with infrared spectroscopy (AFM-IR) and rheological measurements. The distribution of active ingredients has been generally evaluated through techniques such as nanoscale secondary ion mass spectrometry (NanoSIMS). And finally, attempts to explore the potential of hair to be used as a substrate for flexible device fabrication will be introduced.
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Collier V, Patel J, Chiu CY, Fowke JH, Patel TS, Liu-Smith F. Distinctive lower incidence rates of cutaneous melanoma on the hips and lower extremities of men. Clin Exp Dermatol 2023; 48:1333-1340. [PMID: 37467730 DOI: 10.1093/ced/llad236] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 06/14/2023] [Accepted: 07/05/2023] [Indexed: 07/21/2023]
Abstract
BACKGROUND Cutaneous melanomas (CMs) are more frequently found on the trunk in men, and on the hip and lower extremities (legs) in women. This discrepancy has been attributed to greater exposure to ultraviolet (UV) radiation of women's legs due to their dressing habits. OBJECTIVES To understand the sex difference in the bodily distribution of CMs, especially those on the legs. METHODS This was a cancer registry-based cohort study. CM incidences, relative tumour density and tumour mutational burdens (TMBs) were compared among different body sites in different sex and racial groups using the SEER (Surveillance, Epidemiology, and End Results) and TCGA SKCM (The Cancer Genome Atlas skin cutaneous melanoma) databases. RESULTS White men had lower rates and lower relative tumour density (RTD) of CMs on their legs compared with the rest of their body sites, or compared with White women. Men classified by SEER into racial groups other than White did not show such a trend. White women had comparable RTDs among different body sites. The ratios between the 'White' and the 'other' groups were used to evaluate the approximate effect of sun exposure at different body sites, which further validated a distinct protective effect of men's legs in melanoma. TMB on leg melanomas was lower than on other sites in both sexes. CONCLUSIONS The legs of both sexes in White patients show lower RTDs and lower levels of TMB, suggesting a weaker association with UV exposure. Furthermore, White men are especially protected against CM on their legs, suggesting an unknown intrinsic protective factor as compared with women.
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Affiliation(s)
| | | | - Chi-Yang Chiu
- Department of Preventative Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | - Jay H Fowke
- Department of Preventative Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
| | | | - Feng Liu-Smith
- Department of Dermatology
- Department of Preventative Medicine, University of Tennessee Health Science Center, Memphis, TN, USA
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6
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JOURDAIN R, MOGA A, MAGIATIS P, FONTANIÉ M, VELEGRAKI A, PAPADIMOU C, RAHOUL V, GUÉNICHE A, CHOPRA T, GAITANIS G. Malassezia restricta-mediated Lipoperoxidation: A Novel Trigger in Dandruff. Acta Derm Venereol 2023; 103:adv00868. [PMID: 36789756 PMCID: PMC9944333 DOI: 10.2340/actadv.v103.4808] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 01/19/2023] [Indexed: 02/16/2023] Open
Abstract
Dandruff is a common scalp disorder with multiple microbial and host-related factors contributing to its aetiology, including alterations in scalp sebum. Despite existing evidence that the yeast Malassezia restricta plays a key role in the onset of dandruff, the interplay of these factors is poorly understood. Recently, squalene monohydroperoxide and malondialdehyde were established as biomarkers of dandruff-afflicted scalp, highlighting the role of sebum lipoperoxidation in the triggering and maintenance of dandruff, although its mechanism of action is unknown. The current study provides evidence that M. restricta mediates sebum peroxidation, leading to production of squalene monohydroperoxide and malondialdehyde. Furthermore, in vitro data show that these lipoperoxidation products act on epidermal cells and alter the skin barrier. These results support the role of Malassezia restricta-induced lipoperoxides as triggers of dandruff, which suggests that blocking their production could be a novel anti-dandruff treatment approach.
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Affiliation(s)
| | | | - Prokopios MAGIATIS
- National and Kapodistrian University of Athens, Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, Athens
| | | | | | - Chrysanthi PAPADIMOU
- National and Kapodistrian University of Athens, Department of Pharmacognosy and Natural Products Chemistry, Faculty of Pharmacy, Athens
| | | | | | | | - George GAITANIS
- University of Ioannina, Department of Dermatology, Ioannina, Greece,DELC Clinic, Biel, Switzerland
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Marro M, Moccozet L, Vernez D. Assessing Human Eye Exposure to UV Light: A Narrative Review. Front Public Health 2022; 10:900979. [PMID: 35875046 PMCID: PMC9300719 DOI: 10.3389/fpubh.2022.900979] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2022] [Accepted: 04/22/2022] [Indexed: 11/13/2022] Open
Abstract
Exposure to ultraviolet light is associated with several ocular pathologies. Understanding exposure levels and factors is therefore important from a medical and prevention perspective. A review of the current literature on ocular exposure to ultraviolet light is conducted in this study. It has been shown that ambient irradiance is not a good indicator of effective exposure and current tools for estimating dermal exposure have limitations for the ocular region. To address this, three methods have been developed: the use of anthropomorphic manikins, measurements through wearable sensors and numerical simulations. The specific objective, limitations, and results obtained for the three different methods are discussed.
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Affiliation(s)
- Michele Marro
- Computer Science Center, University of Geneva, Geneva, Switzerland
| | - Laurent Moccozet
- Computer Science Center, University of Geneva, Geneva, Switzerland
| | - David Vernez
- Center for Public Health and Primary Care Medicine (Unisanté), University of Lausanne, Lausanne, Switzerland
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8
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Goodenow D, Greer AJ, Cone SJ, Gaddameedhi S. Circadian effects on UV-induced damage and mutations. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2022; 789:108413. [PMID: 35690416 PMCID: PMC9188652 DOI: 10.1016/j.mrrev.2022.108413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Revised: 02/09/2022] [Accepted: 02/14/2022] [Indexed: 10/19/2022]
Abstract
Skin cancer is the most diagnosed type of cancer in the United States, and while most of these malignancies are highly treatable, treatment costs still exceed $8 billion annually. Over the last 50 years, the annual incidence of skin cancer has steadily grown; therefore, understanding the environmental factors driving these types of cancer is a prominent research-focus. A causality between ultraviolet radiation (UVR) exposure and skin cancer is well-established, but exposure to UVR alone is not necessarily sufficient to induce carcinogenesis. The emerging field of circadian biology intersects strongly with the physiological systems of the mammalian body and introduces a unique opportunity for analyzing mechanisms of homeostatic disruption. The circadian clock refers to the approximate 24-hour cycle, in which protein levels of specific clock-controlled genes (CCGs) fluctuate based on the time of day. Though these CCGs are tissue specific, the skin has been observed to have a robust circadian clock that plays a role in its response to UVR exposure. This in-depth review will detail the mechanisms of the circadian clock and its role in cellular homeostasis. Next, the skin's response to UVR exposure and its induction of DNA damage and mutations will be covered - with an additional focus placed on how the circadian clock influences this response through nucleotide excision repair. Lastly, this review will discuss current models for studying UVR-induced skin lesions and perturbations of the circadian clock, as well as the impact of these factors on human health.
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Affiliation(s)
- Donna Goodenow
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27606, USA
| | - Adam J Greer
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27606, USA
| | - Sean J Cone
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27606, USA
| | - Shobhan Gaddameedhi
- Department of Biological Sciences, North Carolina State University, Raleigh, NC 27606, USA; Center for Human Health and the Environment, North Carolina State University, Raleigh, NC 27606, USA.
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Marro M, Moccozet L, Vernez D. Modeling the protective role of human eyelashes against ultraviolet light exposure. Comput Biol Med 2021; 141:105135. [PMID: 34959113 DOI: 10.1016/j.compbiomed.2021.105135] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Revised: 11/27/2021] [Accepted: 12/10/2021] [Indexed: 11/17/2022]
Abstract
The role of eyelashes in ocular radiation protection has been hypothesized for some time. There is however no quantitative knowledge of the shading they provide. The ocular protection provided by eyelashes is investigated in this study. A numerical model able to simulate an arbitrary source of light to illuminate a 3-dimensional head model with realistic details was used for this purpose. The eyelashes' filtering effect was studied for various light incidence angles, diameter and density of cilia. Using average values provided by literature to define their characteristics, we found that eyelashes reduce ultraviolet light received by the cornea by about 12-14%, with maximum values of 24%. These results suggest that the eyelashes can be an important element of the human eye protection system and their role should be further investigated.
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Affiliation(s)
- Michele Marro
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize, 1227, Carouge, CH, Switzerland.
| | - Laurent Moccozet
- University of Geneva, Centre Universitaire d'informatique, Battelle, Batiment A, 7 Route de Drize, 1227, Carouge, CH, Switzerland.
| | - David Vernez
- University of Lausanne, Center for Public Health and Primary Care Medicine (Unisanté), 44 Rue du Bugnon, 1011, Lausanne, CH, Switzerland.
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10
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Hodnik JJ, Jankovec M, Ježek J, Krušič Ž, Mitterhofer S, Starič J. Minimal Erythema Dose Determination in Holstein Friesian Cattle. Front Vet Sci 2021; 8:757452. [PMID: 34790714 PMCID: PMC8591259 DOI: 10.3389/fvets.2021.757452] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2021] [Accepted: 10/04/2021] [Indexed: 11/13/2022] Open
Abstract
Cattle on pasture are continuously exposed to solar UV radiation, which has been associated with biological effects such as sunburn, photosensitization, squamous cell carcinoma, and cutaneous vitamin D3 production. The minimal erythema dose (MED) required to produce first-degree sunburn (erythema) is poorly researched in cattle. Since cattle are naturally covered with dense hair coats, the MED is influenced by the UV protection offered by the hair. The objective of this study was to determine the MED on intact-hair-covered (MED-H) and shaved white skin (MED-S) of Holstein Friesian cattle. Twenty-one Holstein Friesian cows and heifers were MED tested using a narrowband UV-B LED light (peak irradiance at 292 nm) on eight hair-covered and eight shaved areas over white skin previously unexposed to direct sunlight. Erythema was visually assessed after 24 h. The mean MED-H and MED-S were 5,595 and 329 J/m2, respectively. Heifers had a higher MED-H compared to cows, 7,600 and 4,969 J/m2, respectively. The mean UV transmittance of white cattle hair was 6.7%. MED-H was correlated with hair length (Spearman's rho = 0.76). A linear regression model showed that each millimeter of hair coat length increased the MED-H by 316 J/m2. In conclusion, this study provides a MED testing protocol for cattle and reports standardized values of MED for cattle on intact-hair-covered and shaved areas.
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Affiliation(s)
- Jaka Jakob Hodnik
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Marko Jankovec
- Laboratory of Photovoltaics and Optoelectronics, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Jožica Ježek
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
| | - Žiga Krušič
- Department of Neurology, General Hospital Celje, Celje, Slovenia
| | - Stefan Mitterhofer
- Laboratory of Photovoltaics and Optoelectronics, Faculty of Electrical Engineering, University of Ljubljana, Ljubljana, Slovenia
| | - Jože Starič
- Clinic for Reproduction and Large Animals-Section for Ruminants, Veterinary Faculty, University of Ljubljana, Ljubljana, Slovenia
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11
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Huang X, Protheroe MD, Al-Jumaily AM, Paul SP, Chalmers AN. Effect of hair removal on solar UV transmission into skin and implications for melanoma skin cancer development. JOURNAL OF THE OPTICAL SOCIETY OF AMERICA. A, OPTICS, IMAGE SCIENCE, AND VISION 2020; 37:807-812. [PMID: 32400714 DOI: 10.1364/josaa.387558] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
Melanoma is the severest type of skin cancer. As distinct from many other cancer types, the incidence of melanoma has been increasing steadily over the last century. Discovering new risk factors of melanoma will not only raise public awareness but also potentially contribute to the improvement of skin cancer protection in the future. Nowadays, the tendency of shaving skin hair is becoming increasingly popular for aesthetic purposes. However, human hair serves several functions, one of which is ultraviolet (UV) protection for the skin. What is more, stem cells found in the follicles of hair could be the origin of melanoma upon exposure to ultraviolet radiation. Therefore, it is of interest to investigate the effect of shaving on solar UV transmission in the skin. To achieve that, two groups of skin models are constructed in TracePro software: one with unaltered hair and one with shaved hair. The UV transport in the models is simulated using the Monte Carlo method and the absorptions in the stem cells layer are compared. It is found that shaving will increase the UV transmission to the follicular stem cells to a certain degree. More specifically, shaving limbs will generally increase the solar UV transmission from about 5% to 20% in the UV wavelength range.
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12
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Pawlowski S, Petersen-Thiery M. Sustainable Sunscreens: A Challenge Between Performance, Animal Testing Ban, and Human and Environmental Safety. THE HANDBOOK OF ENVIRONMENTAL CHEMISTRY 2020. [DOI: 10.1007/698_2019_444] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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13
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14
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Igoe DP, Amar A, Schouten P, Parisi AV, Turner J. Assessment of Biologically Effective Solar Ultraviolet Exposures for Court Staff and Competitors During a Major Australian Tennis Tournament. Photochem Photobiol 2019; 95:1461-1467. [DOI: 10.1111/php.13132] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 06/09/2019] [Accepted: 06/10/2019] [Indexed: 01/05/2023]
Affiliation(s)
- Damien P. Igoe
- Faculty of Health, Environment and Sciences University of Southern Queensland Toowoomba Qld Australia
| | - Abdurazaq Amar
- Faculty of Health, Environment and Sciences University of Southern Queensland Toowoomba Qld Australia
| | - Peter Schouten
- Faculty of Health, Environment and Sciences University of Southern Queensland Toowoomba Qld Australia
| | - Alfio V. Parisi
- Faculty of Health, Environment and Sciences University of Southern Queensland Toowoomba Qld Australia
| | - Joanna Turner
- Faculty of Health, Environment and Sciences University of Southern Queensland Toowoomba Qld Australia
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Abstract
BACKGROUND Primary cutaneous umbilical melanoma is rare. Thorough information regarding its characteristics and treatment, including use of sentinel lymph node biopsy (SLNB) staging, is difficult to obtain. The unique anatomy of the umbilicus adds to the complexity of diagnosing and treating melanoma at this site. OBJECTIVE To improve understanding of diagnosis and treatment of primary cutaneous umbilical melanoma through presenting 7 new cases and reviewing 39 cases in the literature. MATERIALS AND METHODS The University of Michigan melanoma database query and review of the literature regarding reported cases of primary umbilical melanoma. RESULTS In 7 new and 39 previously reported cases of primary cutaneous umbilical melanoma, we describe signs and symptoms, histopathologic features, differential diagnosis, relevant anatomical considerations, and definitive treatment including SLNB when applicable. CONCLUSION Our series, combined with a thorough literature review and compilation of findings, provides a better understanding and appreciation of melanoma in the unique anatomical site of the umbilicus, with a reminder to carefully examine the umbilicus during a full skin examination in patients at risk of melanoma. Primary umbilical melanoma presents and can be appropriately treated similarly to cutaneous melanoma in other sites, with attention to relevant anatomy.
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16
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Panzella L, Ebato A, Napolitano A, Koike K. The Late Stages of Melanogenesis: Exploring the Chemical Facets and the Application Opportunities. Int J Mol Sci 2018; 19:E1753. [PMID: 29899264 PMCID: PMC6032422 DOI: 10.3390/ijms19061753] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 06/08/2018] [Accepted: 06/08/2018] [Indexed: 11/16/2022] Open
Abstract
In the last decade, the late stages of melanin biosynthesis involving the oxidative polymerization of 5,6-dihydroxyindole (DHI) and 5,6-dihydroxyindole-2-carboxylic acid (DHICA) have been extensively investigated. Most of the information derived from a biomimetic approach in which the oxidation of melanogenic indoles was carried out under conditions mimicking those occurring in the biological environment. Characterization of the early oligomers allowed for drawing a structural picture of DHI and DHICA melanins, providing also an interpretative basis for the different properties exhibited by these pigments, e.g., the chromophore and the antioxidant ability. The improved knowledge has opened new perspectives toward the exploitation of the unique chemistry of melanins and its precursors in cosmetic and health care applications. A noticeable example is the development of an innovative hair dyeing system that is based on the marked ease of DHI to give rise to black melanin on air oxidation under slightly alkaline conditions. The advantage of this method for a step-wise coverage of gray hair with a natural shade pigmentation on repeated treatment with a DHI-based formulation with respect to traditional dyes is presented. A variant of DHICA melanin combining solubility in water-miscible organic solvents, an intense chromophore in the UltraViolet-A UV-A region, and a marked antioxidant potency was evaluated as an ingredient for cosmetic formulations.
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Affiliation(s)
- Lucia Panzella
- Department of Chemical Sciences, University of Naples "Federico II", I-80126 Naples, Italy.
| | - Atsuko Ebato
- Hair Care Products Research Laboratories, Kao Corporation, Tokyo 131-8501, Japan.
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples "Federico II", I-80126 Naples, Italy.
| | - Kenzo Koike
- Hair Care Products Research Laboratories, Kao Corporation, Tokyo 131-8501, Japan.
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Jourdain R, Moga A, Vingler P, El Rawadi C, Pouradier F, Souverain L, Bastien P, Amalric N, Breton L. Exploration of scalp surface lipids reveals squalene peroxide as a potential actor in dandruff condition. Arch Dermatol Res 2016; 308:153-63. [PMID: 26842231 PMCID: PMC4796319 DOI: 10.1007/s00403-016-1623-1] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Revised: 12/21/2015] [Accepted: 01/12/2016] [Indexed: 01/17/2023]
Abstract
Dandruff is a common but complex disorder with three major contributing factors: (1) individual predisposition, (2) scalp sebum and (3) Malassezia yeast colonization. To obtain further insights into the role of sebum in dandruff biogenesis, we analyzed scalp lipid species in a cohort of ten dandruff-free (control) and ten dandruff-afflicted volunteers by gas chromatography coupled to mass spectrometry. Lipid peroxidation levels and biochemical markers of oxidative stress were also assessed. Squalene, a major sebum component, was significantly more peroxidized in dandruff-affected scalps, resulting in significantly higher ratios of squalene monohydroperoxide (SQOOH)/squalene. This was observed when comparing dandruff-affected zones of dandruff subjects to both their non-affected zones and control subjects. In addition, other biomarkers such as malondialdehyde indicated that oxidative stress levels were raised on dandruff scalps. Surprisingly, differences regarding either free or bound fatty acids were fairly rare and minor. Certain novel findings, especially squalene peroxidation levels, were then confirmed in a validation cohort of 24 dandruff-affected subjects, by comparing dandruff-affected and non-dandruff zones from the same individuals. As SQOOH can induce both keratinocyte inflammatory responses and hyperproliferation in vitro, we hypothesized that increased SQOOH could be considered as a new etiological dandruff factor via its ability to impair scalp barrier function. Our results also indicated that Malassezia could be a major source of squalene peroxidation on the scalp.
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Affiliation(s)
| | | | | | | | | | - Luc Souverain
- L'OREAL Research and Innovation, Aulnay-sous-Bois, France
| | | | | | - Lionel Breton
- L'OREAL Research and Innovation, Aulnay-sous-Bois, France
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