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Qin H, Yang J, Jiang H, Huang S, Fu Q, Zhu B, Liu M, Chen G. Effect of 460 nm blue light PBM on human MeWo melanoma cells. JOURNAL OF BIOPHOTONICS 2024; 17:e202400071. [PMID: 38937982 DOI: 10.1002/jbio.202400071] [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: 02/25/2024] [Revised: 05/20/2024] [Accepted: 05/21/2024] [Indexed: 06/29/2024]
Abstract
Photobiomodulation (PBM) using 460 nm blue light has been shown to have an inhibitory effect on skin cancer cells. In this study, we used a continuous LED light source with a wavelength of 460 nm and designed various combinations of power density (ranging from 6.4 to 25.6 mW) and dose (ranging from 0.96 to 30.72 J/cm2) to conduct treatment experiments on MeWo cells to investigate the effects of blue light on MeWo melanoma cells. We are focusing on cell viability, cytotoxicity, mitochondrial function, oxidative stress, and apoptosis. We found that blue light inhibits these melanoma cells through oxidative stress and DNA damage, and this inhibition intensifies at higher irradiance levels. Although the cells initially attempt to resist the stress induced by the treatment, they eventually undergo apoptosis over time. These findings contribute to understanding melanoma's molecular response to blue light PBM, lay the groundwork for future clinical applications.
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Affiliation(s)
- Haokuan Qin
- Academy for Engineering and Technology, Fudan University, China
| | - Jiali Yang
- School of Information Science and Technology, Fudan University, Shanghai, China
| | - Hui Jiang
- Academy for Engineering and Technology, Fudan University, China
| | - Shijie Huang
- School of Information Science and Technology, Fudan University, Shanghai, China
| | - Qiqi Fu
- School of Information Science and Technology, Fudan University, Shanghai, China
| | - Baohua Zhu
- Zhongshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese Medicine, Zhongshan City, China
| | - Muqing Liu
- Academy for Engineering and Technology, Fudan University, China
- School of Information Science and Technology, Fudan University, Shanghai, China
- Zhongshan Fudan Joint Innovation Center, Zhongshan, China
| | - Gaofei Chen
- Zhongshan Hospital of Traditional Chinese Medicine Affiliated to Guangzhou University of Traditional Chinese Medicine, Zhongshan City, China
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2
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Ge Y, Li M, Bai S, Chen C, Zhang S, Cheng J, Wang X. Doxercalciferol alleviates UVB-induced HaCaT cell senescence and skin photoaging. Int Immunopharmacol 2024; 127:111357. [PMID: 38104366 DOI: 10.1016/j.intimp.2023.111357] [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] [Received: 08/19/2023] [Revised: 11/23/2023] [Accepted: 12/07/2023] [Indexed: 12/19/2023]
Abstract
Prolonged or excessive ultraviolet (UV) exposure can lead to premature skin aging. Doxercalciferol (Dox), an analog of vitamin D2, is chiefly used to treat endocrine diseases, cardiovascular diseases, kidney diseases, etc. To date, research on Dox in alleviating photoaging and UV-induced inflammation is scarce. In this research, we evaluated the function of Dox in ultraviolet radiation B (UVB)-induced photoaging and explored the potential mechanism in human keratinocytes (Hacat) and BALB/c mice. First, we established a stable UVB-induced photoaging cell model. Then, we found that the senescence β-galactosidase (SA-β-Gal) positive rate, senescence-related protein (p16), aging-related genes (p21 and p53), senescence-associated secretory phenotype (SASP), inflammatory driving factors (IL-1β and IL-6) and matrix metalloproteinases (MMPs) (MMP1 and MMP9) were upregulated in HaCaT cells after UVB irradiation. At the same time, the effect of UVB on the back skin of BALB/c mice showed a consistent trend. Dox effectively alleviated the aforementioned changes caused by UVB radiation. Mechanistically, we found that UVB activated mitogen-activated protein kinase (MAPK) and nuclear factor kappa B (NF-κB) signaling pathways, and Dox inhibited UVB-activated NF-κB and MAPK. Furthermore, Dox inhibited UVB-induced skin photoaging and damage in mice. In summary, Dox has been improved to inhibit photoaging, which may help to develop therapies to delay skin photoaging.
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Affiliation(s)
- Yuchen Ge
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China
| | - Man Li
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China
| | - Shirui Bai
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China
| | - Cui Chen
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China
| | - Shulin Zhang
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China
| | - Jiamao Cheng
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China.
| | - Xiaobo Wang
- School of Basic Medicine, Dali University, Dali, Yunnan 671000, China.
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Jeong WS, Kong HR, Kim SY, Yeo SH. Exploring the Health Benefits of Yeast Isolated from Traditional Fermented Foods in Korea: Anti-Inflammatory and Functional Properties of Saccharomyces and Non- Saccharomyces Strains. Microorganisms 2023; 11:1503. [PMID: 37375005 DOI: 10.3390/microorganisms11061503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2023] [Revised: 05/26/2023] [Accepted: 06/01/2023] [Indexed: 06/29/2023] Open
Abstract
Traditional yeast (Saccharomyces cerevisiae) has been used for its benefits in various fermentation processes; the benefits of non-Saccharomyces yeast as a material for food, feed, and pharmaceuticals have been studied recently. This study evaluated the anti-inflammatory activity and extracellular functional characteristics of wild-type yeasts isolated from traditional fermented foods (doenjang (common name: soybean paste) and nuruk) in Korea. The viability of the yeast and lipopolysaccharide (LPS)-stimulated RAWBlue™ cells was improved, similar to unstimulated RAWBlue™ cells, and the isolates demonstrated NF-κB inhibitory activity. Yeast suppressed the nitric oxide production in LPS-stimulated RAWBlue™ cells, which was attributed to the inhibition of iNOS or COX-2 mRNA expression depending on the strain. Although there were differences depending on the strain, the production of anti-inflammatory cytokines was reduced in the yeast and LPS-stimulated RAWBlue™ cells, some of which were demonstrated at the mRNA level. In addition, the isolates exhibited high antioxidant and antihypertensive activities (similar to the positive control), which varied depending on the strain. This suggests that yeast can be used for fermentation with enhanced antioxidant and antihypertensive activities. Furthermore, the isolates inhibited the growth of pathogenic Gram-negative bacteria, indicating that yeast can inhibit food spoilage and the growth of pathogenic bacteria during fermentation. Consequently, utilizing raw materials to cultivate yeast strains could be a promising avenue for developing functional foods to prevent and treat inflammatory reactions; such foods may exhibit antioxidant, antihypertensive, and antibacterial properties.
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Affiliation(s)
- Woo-Soo Jeong
- Fermented and Processed Food Science Division, Department of Agrofood Resources, Rural Development Administration, National Institute of Agricultural Sciences, Wanju 55365, Republic of Korea
| | - Ha-Ram Kong
- Fermented and Processed Food Science Division, Department of Agrofood Resources, Rural Development Administration, National Institute of Agricultural Sciences, Wanju 55365, Republic of Korea
| | - So-Young Kim
- Fermented and Processed Food Science Division, Department of Agrofood Resources, Rural Development Administration, National Institute of Agricultural Sciences, Wanju 55365, Republic of Korea
| | - Soo-Hwan Yeo
- Fermented and Processed Food Science Division, Department of Agrofood Resources, Rural Development Administration, National Institute of Agricultural Sciences, Wanju 55365, Republic of Korea
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Fujii J, Soma Y, Matsuda Y. Biological Action of Singlet Molecular Oxygen from the Standpoint of Cell Signaling, Injury and Death. Molecules 2023; 28:molecules28104085. [PMID: 37241826 DOI: 10.3390/molecules28104085] [Citation(s) in RCA: 16] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 05/11/2023] [Accepted: 05/12/2023] [Indexed: 05/28/2023] Open
Abstract
Energy transfer to ground state triplet molecular oxygen results in the generation of singlet molecular oxygen (1O2), which has potent oxidizing ability. Irradiation of light, notably ultraviolet A, to a photosensitizing molecule results in the generation of 1O2, which is thought to play a role in causing skin damage and aging. It should also be noted that 1O2 is a dominant tumoricidal component that is generated during the photodynamic therapy (PDT). While type II photodynamic action generates not only 1O2 but also other reactive species, endoperoxides release pure 1O2 upon mild exposure to heat and, hence, are considered to be beneficial compounds for research purposes. Concerning target molecules, 1O2 preferentially reacts with unsaturated fatty acids to produce lipid peroxidation. Enzymes that contain a reactive cysteine group at the catalytic center are vulnerable to 1O2 exposure. Guanine base in nucleic acids is also susceptible to oxidative modification, and cells carrying DNA with oxidized guanine units may experience mutations. Since 1O2 is produced in various physiological reactions in addition to photodynamic reactions, overcoming technical challenges related to its detection and methods used for its generation would allow its potential functions in biological systems to be better understood.
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Affiliation(s)
- Junichi Fujii
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata 990-9585, Japan
| | - Yuya Soma
- Graduate School of Nursing, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan
| | - Yumi Matsuda
- Graduate School of Nursing, Yamagata University Faculty of Medicine, Yamagata 990-9585, Japan
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Characterization of Spontaneous Melanization by Fluorescence Spectroscopy: A Basis for Analytical Application to Biological Substrates. BIOLOGY 2023; 12:biology12030433. [PMID: 36979125 PMCID: PMC10044826 DOI: 10.3390/biology12030433] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 03/07/2023] [Accepted: 03/10/2023] [Indexed: 03/16/2023]
Abstract
Melanin is present in various biological substrates where it may participate in several processes, from innate immunity to the still-unsolved opposite roles in antioxidant protection, including photoprotection and the related ability to interact with light. Melanin–light interaction has also been an important source of inspiration for the development of innovative bioengineering applications. These are based on melanin’s light-energy-absorption ability of its chemically and structurally complex components and precursors, and on the improvement in analytical and diagnostic procedures in biomedicine. In this regard, here, we characterized the fluorescence spectral properties of melanin and of its precursor L-tyrosine in an aqueous solution during spontaneous melanization. Besides the confirmation of the typical fluorescence-emission signature of melanin and L-tyrosine, we provide additional insights on both emission and excitation spectra recorded during melanization. On these bases, we performed a subsequent characterization on the aqueous extracts from two different melanin-containing biological substrates, namely hairs from a domestic black cat and eggs from the Asian tiger mosquito. The results from the mild extraction procedure, purposely applied to obtain only the soluble components, combined with fluorescence spectral analysis are expected to promote further investigation of the melanization processes, particularly in insects.
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Xu N, Li B, Liu Y, Yang C, Tang S, Cho WC, Huang Z. Ferroptosis and triple-negative breast cancer: Potential therapeutic targets. Front Oncol 2022; 12:1017041. [PMID: 36568247 PMCID: PMC9780505 DOI: 10.3389/fonc.2022.1017041] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 11/10/2022] [Indexed: 12/13/2022] Open
Abstract
Purpose Triple-negative breast cancer (TNBC) is an aggressive tumor with poor prognosis, it has higher recurrence and metastatic rates than other breast cancer subtypes. This study aims to investigate biomarkers and potential targets for TNBC related to ferroptosis through data mining and bioinformatics analysis. The findings may provide new insights for treating TNBC. Methods The TNBC patients' data from the Cancer Genome Atlas (TCGA) database were extracted for differential expression and prognosis analysis. Consensus genes obtained by intersecting differential expressed and ferroptosis-related genes was used to establish the prognostic model by the univariate and multivariate Cox analyses. Besides, TNBC data from the Gene Expression Omnibus (GEO) database was used to confirm the reliability of the prognosis model. Moreover, clinical information was analyzed by multifactorial independent analysis to identify independent prognostic factors. The expression of genes constituting the prognostic model was further validated using the Human Protein Atlas (HPA) database. Finally, the Comparative Toxicogenomic Data (CTD) database was used to explore possible treatment drugs for TNBC. Results We obtained 13,245 differential expressed genes, and 177 consensus genes. 98 genes with prognostic implication were obtained by univariable Cox. Then, a prognostic model including 12 ferroptosis-related genes was constructed by multivariable Cox. The area under curve (AUC) value of the prognostic model for TNBC was 0.82. The GEO database validated that the model (AUC = 0.77) could predict the patient outcomes. The staining results of 10 out of 12 prognostic model genes in HPA database showed that their expression was consistent with our predictions. Clinical risk analysis indicated that risk score of patients could act as an independent prognostic factor. Finally, six drugs that may have interaction with 12 ferroptosis-related genes were obtained using the CTD database. Conclusion The prognostic model composed of 12 ferroptosis-related genes could predict the prognosis of TNBC patients, and seven genes (ASNS, LAMP2, CAV1, DPP4, HELLS, TF, ZFP69B) could be potential new therapeutic targets for TNBC, and two drugs (1-methyl-3-isobutylxanthine, rosiglitazone) could act as potential therapeutic drugs for the treatment of TNBC.
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Affiliation(s)
- Na Xu
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong, China,Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - Baohong Li
- Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - Yong Liu
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong, China,Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - Cui Yang
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong, China,Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - Siqi Tang
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong, China,Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China
| | - William C. Cho
- Department of Clinical Oncology, Queen Elizabeth Hospital, Kowloon, Hong Kong SAR, China,*Correspondence: Zunnan Huang, ; William C. Cho,
| | - Zunnan Huang
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan, Guangdong, China,Key Laboratory of Big Data Mining and Precision Drug Design of Guangdong Medical University, Key Laboratory of Computer-Aided Drug Design of Dongguan City, Key Laboratory for Research and Development of Natural Drugs of Guangdong Province, School of Pharmacy, Guangdong Medical University, Dongguan, Guangdong, China,Marine Medical Research Institute of Guangdong Zhanjiang, Zhanjiang, Guangdong, China,*Correspondence: Zunnan Huang, ; William C. Cho,
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7
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Basri DF, Lew LC, Muralitharan RV, Nagapan TS, Ghazali AR. Pterostilbene Inhibits the Melanogenesis Activity in UVB-Irradiated B164A5 Cells. Dose Response 2021; 19:15593258211047651. [PMID: 34840540 PMCID: PMC8619742 DOI: 10.1177/15593258211047651] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Accepted: 09/01/2021] [Indexed: 11/05/2022] Open
Abstract
Pterostilbene is a potent antioxidant and anti-inflammatory agent. However, its chemopreventive effects via anti-tyrosinase activity and inhibitory effects on melanin content have not been reported previously. Hence, this study aimed to investigate the anti-melanogenic activity of pterostilbene on UVB-irradiated B164A5 mouse melanoma cells. The effects of pterostilbene and resveratrol on cell viability were determined by MTT assay, whereas melanin content and tyrosinase assay were employed to assess melanogenesis activity. Western blot analysis was performed to determine the tyrosinase expression. Based on the MTT assay, the IC50 value of pterostilbene on UVB-irradiated B164A5 cells was 34.0 ± 3.43 μM, in comparison to resveratrol (>100 μM). Next, 5 and 10 μM pterostilbene showed a significant dose-dependent inhibition (P < .01) of tyrosinase activity in UVB-irradiated B164A5 cells at 37.14 ± 2.71% and 58.36 ± 6.8%, respectively. The findings from the tyrosinase assay also confirmed the downregulation of tyrosinase expression in UVB-irradiated B164A5 cells as measured by Western blot analysis. Finally, 10 μM pterostilbene showed a significantly decreased melanin content (P < .01) in UVB-irradiated B164A5 cells, at 27.34 ± .98 μg/mL. In conclusion, pterostilbene showed anti-melanogenic activity that was 10 times more potent than resveratrol in the UVB-irradiated B164A5 cell.
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Affiliation(s)
- Dayang Fredalina Basri
- Centre for Diagnostic, Therapeutic & Investigative Studies (CODTIS), Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Leong Chen Lew
- Biomedical Science Program, Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Raveena Vaidheswary Muralitharan
- Centre for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Tava Shelan Nagapan
- Centre for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
| | - Ahmad Rohi Ghazali
- Centre for Toxicology and Health Risk Studies (CORE), Faculty of Health Sciences, Universiti Kebangsaan Malaysia, Jalan Raja Muda Abdul Aziz, 50300 Kuala Lumpur, Malaysia
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Yakimov BP, Shirshin EA, Schleusener J, Allenova AS, Fadeev VV, Darvin ME. Melanin distribution from the dermal-epidermal junction to the stratum corneum: non-invasive in vivo assessment by fluorescence and Raman microspectroscopy. Sci Rep 2020; 10:14374. [PMID: 32873804 PMCID: PMC7463016 DOI: 10.1038/s41598-020-71220-6] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 08/11/2020] [Indexed: 12/11/2022] Open
Abstract
The fate of melanin in the epidermis is of great interest due to its involvement in numerous physiological and pathological processes in the skin. Melanin localization can be assessed ex vivo and in vivo using its distinctive optical properties. Melanin exhibits a characteristic Raman spectrum band shape and discernible near-infrared excited (NIR) fluorescence. However, a detailed analysis of the capabilities of depth-resolved confocal Raman and fluorescence microspectroscopy in the evaluation of melanin distribution in the human skin is lacking. Here we demonstrate how the fraction of melanin at different depths in the human skin in vivo can be estimated from its Raman spectra (bands at 1,380 and 1,570 cm-1) using several procedures including a simple ratiometric approach, spectral decomposition and non-negative matrix factorization. The depth profiles of matrix factorization components specific to melanin, collagen and natural moisturizing factor provide information about their localization in the skin. The depth profile of the collagen-related matrix factorization component allows for precise determination of the dermal-epidermal junction, i.e. the epidermal thickness. Spectral features of fluorescence background originating from melanin were found to correlate with relative intensities of the melanin Raman bands. We also hypothesized that NIR fluorescence in the skin is not originated solely from melanin, and the possible impact of oxidized species should be taken into account. The ratio of melanin-related Raman bands at 1,380 and 1,570 cm-1 could be related to melanin molecular organization. The proposed combined analysis of the Raman scattering signal and NIR fluorescence could be a useful tool for rapid non-invasive in vivo diagnostics of melanin-related processes in the human skin.
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Affiliation(s)
- B P Yakimov
- Faculty of Physics, M.V. Lomonosov Moscow State University, 1-2 Leninskie Gory, Moscow, Russia, 119991
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, Moscow, Russia, 119991
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, Trubetskaya 8-2, Moscow, Russia, 119991
| | - E A Shirshin
- Faculty of Physics, M.V. Lomonosov Moscow State University, 1-2 Leninskie Gory, Moscow, Russia, 119991.
- Institute for Regenerative Medicine, Sechenov First Moscow State Medical University, Trubetskaya 8-2, Moscow, Russia, 119991.
- Institute of Spectroscopy of the Russian Academy of Sciences, Fizicheskaya Str., 5, 108840, Troitsk, Moscow, Russia.
| | - J Schleusener
- Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany
| | - A S Allenova
- Medical Research and Education Center, M.V. Lomonosov Moscow State University, Lomonosovsky Prospect 27/10, Moscow, Russia, 119991
- Division of Immune-Mediated Skin Diseases, Sechenov First Moscow State Medical University, Trubetskaya 8-2, Moscow, Russia, 119991
| | - V V Fadeev
- Faculty of Physics, M.V. Lomonosov Moscow State University, 1-2 Leninskie Gory, Moscow, Russia, 119991
| | - M E Darvin
- Department of Dermatology, Venerology and Allergology, Center of Experimental and Applied Cutaneous Physiology, Charité - Universitätsmedizin Berlin, Corporate Member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health, Charitéplatz 1, 10117, Berlin, Germany.
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Markiewicz E, Idowu OC. Melanogenic Difference Consideration in Ethnic Skin Type: A Balance Approach Between Skin Brightening Applications and Beneficial Sun Exposure. Clin Cosmet Investig Dermatol 2020; 13:215-232. [PMID: 32210602 PMCID: PMC7069578 DOI: 10.2147/ccid.s245043] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Accepted: 02/13/2020] [Indexed: 12/20/2022]
Abstract
Human skin demonstrates a striking variation in tone and color that is evident among multiple demographic populations. Such characteristics are determined predominantly by the expression of the genes controlling the quantity and quality of melanin, which can alter significantly due to the presence of small nucleotide polymorphism affecting various steps of the melanogenesis process and generally linked to the lighter skin phenotypes. Genetically determined, constitutive skin color is additionally complemented by the facultative melanogenesis and tanning responses; with high levels of melanin and melanogenic factors broadly recognized to have a protective effect against the UVR-induced molecular damage in darker skin. Long-term sun exposure, together with a genetic makeup responsible for the ability to tan or the activity of constitutive melanogenic factors, triggers defects in pigmentation across all ethnic skin types. However, sun exposure also has well documented beneficial effects that manifest at both skin homeostasis and the systemic level, such as synthesis of vitamin D, which is thought to be less efficient in the presence of high levels of melanin or potentially linked to the polymorphism in the genes responsible for skin darkening triggered by UVR. In this review, we discuss melanogenesis in a context of constitutive pigmentation, defined by gene polymorphism in ethnic skin types, and facultative pigmentation that is not only associated with the capacity to protect the skin against photo-damage but could also have an impact on vitamin D synthesis through gene polymorphism. Modulating the activities of melanogenic genes, with the focus on the markers specifically altered by polymorphism combined with differential requirements of sun exposure in ethnic skin types, could enhance the applications of already existing skin brightening factors and provide a novel approach toward improved skin tone and health in personalized skincare.
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Affiliation(s)
- Ewa Markiewicz
- Hexis Lab Limited, The Core, Newcastle Helix, Newcastle Upon Tyne NE4 5TF, UK
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10
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Cecchi T, Pezzella A, Di Mauro E, Cestola S, Ginsburg D, Luzi M, Rigucci A, Santato C. On the antioxidant activity of eumelanin biopigments: a quantitative comparison between free radical scavenging and redox properties. Nat Prod Res 2019; 34:2465-2473. [DOI: 10.1080/14786419.2018.1542391] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
| | - Alessandro Pezzella
- Dipartimento di Scienze Chimiche, Universita` di Napoli Federico II, Napoli, Italy
| | - Eduardo Di Mauro
- Department of Engineering Physics, Polytechnique Montreal, Montreal, Quebec, Canada
| | | | | | | | | | - Clara Santato
- Department of Engineering Physics, Polytechnique Montreal, Montreal, Quebec, Canada
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11
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Del Bino S, Duval C, Bernerd F. Clinical and Biological Characterization of Skin Pigmentation Diversity and Its Consequences on UV Impact. Int J Mol Sci 2018; 19:ijms19092668. [PMID: 30205563 PMCID: PMC6163216 DOI: 10.3390/ijms19092668] [Citation(s) in RCA: 135] [Impact Index Per Article: 22.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2018] [Revised: 07/24/2018] [Accepted: 07/27/2018] [Indexed: 12/27/2022] Open
Abstract
Skin color diversity is the most variable and noticeable phenotypic trait in humans resulting from constitutive pigmentation variability. This paper will review the characterization of skin pigmentation diversity with a focus on the most recent data on the genetic basis of skin pigmentation, and the various methodologies for skin color assessment. Then, melanocyte activity and amount, type and distribution of melanins, which are the main drivers for skin pigmentation, are described. Paracrine regulators of melanocyte microenvironment are also discussed. Skin response to sun exposure is also highly dependent on color diversity. Thus, sensitivity to solar wavelengths is examined in terms of acute effects such as sunburn/erythema or induced-pigmentation but also long-term consequences such as skin cancers, photoageing and pigmentary disorders. More pronounced sun-sensitivity in lighter or darker skin types depending on the detrimental effects and involved wavelengths is reviewed.
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Affiliation(s)
- Sandra Del Bino
- L'Oréal Research and Innovation, 1 avenue Eugène Schueller, 93601 Aulnay-sous-Bois, France.
| | - Christine Duval
- L'Oréal Research and Innovation, 1 avenue Eugène Schueller, 93601 Aulnay-sous-Bois, France.
| | - Françoise Bernerd
- L'Oréal Research and Innovation, 1 avenue Eugène Schueller, 93601 Aulnay-sous-Bois, France.
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12
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Kim Y, Lee S, Ryu JH, Yoon KD, Shin SS. Effect of Aurea Helianthus stem extract on anti-melanogenesis. Biosci Biotechnol Biochem 2018; 82:1871-1879. [PMID: 30146944 DOI: 10.1080/09168451.2018.1506311] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
Aurea Helianthus (AH), also known as wild confederate rose or golden sunflower, is a curative herb. It has been used as a medicinal material in China due to its anti-inflammatory, immune regulatory, and anti-oxidant activities. However, its melanogenic effect on skin has not been sufficiently investigated. In this study, we tested whether AH has melanogenic inhibitory activities for the development of effective skin whitening agent. The extract showed inhibition of melanin synthesis and reduced the oxidation of 3, 4-dihydroxyphenilalanine (DOPA) to o-dopaquinone. Additionally, AH downregulated the levels of microphthalmia-associated transcription factor (MITF), tyrosinase and tyrosinase related proteins (TRPs), suggesting that AH has inhibitory effects on melanogenesis. Analysis of the components of AH showed that it contained paprazine and trans-N-feruloyltyramine (FA). We confirmed that the effect of AH resulted from paprazine and FA. Therefore, AH might have potential as an effective candidate for skin whitening.
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Affiliation(s)
- Yehyang Kim
- a Natural Products and Materials Research Institute , SK bioland, Cheongju-si , Korea
| | - Sohun Lee
- a Natural Products and Materials Research Institute , SK bioland, Cheongju-si , Korea
| | - Ji Hye Ryu
- a Natural Products and Materials Research Institute , SK bioland, Cheongju-si , Korea
| | - Kee Dong Yoon
- b College of Pharmacy , The Catholic University , Bucheon , Korea
| | - Song Seok Shin
- a Natural Products and Materials Research Institute , SK bioland, Cheongju-si , Korea
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13
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Anti-melanogenic effect of gomisin N from Schisandra chinensis (Turcz.) Baillon (Schisandraceae) in melanoma cells. Arch Pharm Res 2017; 40:807-817. [DOI: 10.1007/s12272-017-0903-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 02/15/2017] [Indexed: 11/25/2022]
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14
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Galván I, Palacios D, Negro JJ. The bare head of the Northern bald ibis ( Geronticus eremita) fulfills a thermoregulatory function. Front Zool 2017; 14:15. [PMID: 28265294 PMCID: PMC5333446 DOI: 10.1186/s12983-017-0201-5] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2017] [Accepted: 02/24/2017] [Indexed: 11/18/2022] Open
Abstract
Background Dark pigments provide animals with several adaptive benefits such as protection against ultraviolet (UV) radiation and mechanical abrasion, but may also impose several constraints like a high absorbance of solar radiation. Endotherms, with relatively constant and high body temperatures, may be especially prone to thermoregulatory limitations if dark coloured and inhabiting hot environments. It is therefore expected that adaptations have specifically evolved because of these limitations. Bare, highly vascularised head skin may have evolved in birds with dark plumage from hot geographical regions because of favouring heat dissipation. Using the Northern bald ibis (Geronticus eremita) as a model species, we measured the surface temperature (Tsurf) of the head, the bill and the black feathered body of 11 birds along ambient temperatures (Ta) ranging from 21 to 42.5 °C employing thermal imaging. Results While Tsurf of the bill and the feathered body was only slightly above Ta, head Tsurf was considerably higher, by up to 12 °C. Estimated values of heat loss followed similar variations. We also found that the red colour intensity of the head of ibises increased with head Tsurf, suggesting that birds are capable of controlling blood flow and the thermoregulatory function of the head. Conclusions These findings are consistent with the hypothesis that bare skin has evolved in dark pigmented birds inhabiting hot environments because of their ability to dissipate heat. Electronic supplementary material The online version of this article (doi:10.1186/s12983-017-0201-5) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Ismael Galván
- Department of Evolutionary Ecology, Doñana Biological Station - CSIC, 41092 Sevilla, Spain
| | - Daniel Palacios
- Department of Zoology, University of Córdoba, 14071 Córdoba, Spain
| | - Juan José Negro
- Department of Evolutionary Ecology, Doñana Biological Station - CSIC, 41092 Sevilla, Spain
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15
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Lee KW, Ryu HW, Oh SS, Park S, Madhi H, Yoo J, Park KH, Kim KD. Depigmentation of α-melanocyte-stimulating hormone-treated melanoma cells by β-mangostin is mediated by selective autophagy. Exp Dermatol 2016; 26:585-591. [PMID: 27714857 DOI: 10.1111/exd.13233] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/27/2016] [Indexed: 01/07/2023]
Abstract
Melanogenesis is a key pathway for the regulation of skin pigmentation and the development of skin-lightening/skin-whitening drugs or cosmetics. In this study, we found that β-mangostin from seedcases of Garcinia mangostana inhibited α-melanocyte-stimulating hormone (α-MSH)-mediated melanogenesis in B16F10 melanoma cells and a three-dimensional human skin model. β-Mangostin significantly inhibited the protein level of tyrosinase induced by α-MSH in UPS (ubiquitin proteasome system)-independent and lysosome-dependent manner. The inhibition of autophagy by 3-methyladenine treatment or ATG5 knockdown effectively recovered premelanosome protein as well as tyrosinase degraded by the β-mangostin treatment. However, rapamycin, a representative non-selective autophagy inducer, triggered autophagy in α-MSH-stimulated cells, which was characterized by a considerable decrease in p62, but it was unable to inhibit melanogenesis. Melanosome-engulfing autophagosomes were observed using transmission electron microscopy. Furthermore, previously formed melanin could be degraded effectively in an autophagy-dependent manner in β-mangostin-treated cells. Taken together, our results suggest that β-mangostin inhibits the melanogenesis induced by α-MSH via an autophagy-dependent mechanism, and thus, the depigmentation effect of β-mangostin may depend on autophagy targeted at the melanosome rather than non-selective autophagy.
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Affiliation(s)
- Ki Won Lee
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Hyung Won Ryu
- Natural Medicine Research Center, KRIBB, Cheongwon, Korea
| | - Sang-Seok Oh
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Soojong Park
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Hamadi Madhi
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Jiyun Yoo
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Ki-Hun Park
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea
| | - Kwang Dong Kim
- Division of Applied Life Science (BK21 Plus), Gyeongsang National University, Jinju, Korea.,PMBBRC, Gyeongsang National University, Jinju, Korea
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16
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Böhm M, Hill HZ. Ultraviolet B, melanin and mitochondrial DNA: Photo-damage in human epidermal keratinocytes and melanocytes modulated by alpha-melanocyte-stimulating hormone. F1000Res 2016; 5:881. [PMID: 27303631 PMCID: PMC4890311 DOI: 10.12688/f1000research.8582.1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 05/04/2016] [Indexed: 02/01/2023] Open
Abstract
Alpha-melanocyte-stimulating hormone (alpha-MSH) increases melanogenesis and protects from UV-induced DNA damage. However, its effect on mitochondrial DNA (mtDNA) damage is unknown. We have addressed this issue in a pilot study using human epidermal keratinocytes and melanocytes incubated with alpha-MSH and irradiated with UVB. Real-time touchdown PCR was used to quantify total and deleted mtDNA. The deletion detected encompassed the common deletion but was more sensitive to detection. There were 4.4 times more mtDNA copies in keratinocytes than in melanocytes. Irradiation alone did not affect copy numbers. Alpha-MSH slightly increased copy numbers in both cell types in the absence of UVB and caused a similar small decrease in copy number with dose in both cell types. Deleted copies were nearly twice as frequent in keratinocytes as in melanocytes. Alpha-MSH reduced the frequency of deleted copies by half in keratinocytes but not in melanocytes. UVB dose dependently led to an increase in the deleted copy number in alpha-MSH-treated melanocytes. UVB irradiation had little effect on deleted copy number in alpha-MSH-treated keratinocytes. In summary, alpha-MSH enhances mtDNA damage in melanocytes presumably by increased melanogenesis, while α-MSH is protective in keratinocytes, the more so in the absence of irradiation.
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Affiliation(s)
- Markus Böhm
- Department of Dermatology, University of Münster, Münster, Germany
| | - Helene Z Hill
- Department of Radiology, Rutgers New Jersey Medical School, Newark, NJ, USA
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17
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Jeong YM, Ha JH, Noh GY, Park SN. Inhibitory effects of mung bean ( Vigna radiata L.) seed and sprout extracts on melanogenesis. Food Sci Biotechnol 2016; 25:567-573. [PMID: 30263307 PMCID: PMC6049183 DOI: 10.1007/s10068-016-0079-6] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 11/12/2015] [Accepted: 11/19/2015] [Indexed: 10/22/2022] Open
Abstract
Inhibitory effect against melanogenesis and the in vitro tyrosinase inhibitory activity of ethyl acetate (EtOAc) and methylene chloride fractions of 80% methanol extracts of mung bean (Vigna radiata L.) seeds and sprouts were determined. EtOAc extract fractions from mung bean sprouts germinated for 12 h (33.5%), 1 day (56.5%), and 2 days (47.9%) inhibited melanogenesis more effectively than arbutin (16.3%). The in vitro tyrosinase inhibitory activity was higher in an EtOAc extract fraction from mung bean sprouts germinated for 2 days (70.5%). EtOAc extract fractions from mung bean sprouts germinated for 1 day showed excellent whitening effects due to the flavone vitexin. Extracts from mung bean sprouts germinated for 1 day can be used as a novel whitening cosmeceutical ingredient.
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Affiliation(s)
- Yoo Min Jeong
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, Seoul, 01811 Korea
| | - Ji Hoon Ha
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, Seoul, 01811 Korea
| | - Geun Young Noh
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, Seoul, 01811 Korea
| | - Soo Nam Park
- Department of Fine Chemistry, Cosmetic R&D Center, Seoul National University of Science and Technology, Seoul, 01811 Korea
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18
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Solano F. Photoprotectionversusphotodamage: updating an old but still unsolved controversy about melanin. POLYM INT 2016. [DOI: 10.1002/pi.5117] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- F Solano
- Department of Biochemistry and Molecular Biology B and Research Group for Molecular Control of Cell Proliferation, School of Medicine and IMIB; University of Murcia; 30100 Murcia Spain
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19
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You JC, Jung HS, Kim HS, Lee JH, Moh SH. The Effect of Roots Extract from Potentilla chinensis as Cosmeceutical Material. ACTA ACUST UNITED AC 2016. [DOI: 10.3839/jabc.2016.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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20
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Del Bino S, Ito S, Sok J, Nakanishi Y, Bastien P, Wakamatsu K, Bernerd F. Chemical analysis of constitutive pigmentation of human epidermis reveals constant eumelanin to pheomelanin ratio. Pigment Cell Melanoma Res 2015; 28:707-17. [PMID: 26285058 DOI: 10.1111/pcmr.12410] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 08/13/2015] [Indexed: 01/17/2023]
Abstract
The skin constitutive pigmentation is given by the amount of melanin pigment, its relative composition (eu/pheomelanin) and distribution within the epidermis, and is largely responsible for the sensitivity to UV exposure. Nevertheless, a precise knowledge of melanins in human skin is lacking. We characterized the melanin content of human breast skin samples with variable pigmentations rigorously classified through the Individual Typology Angle (ITA) by image analysis, spectrophotometry after solubilization with Soluene-350 and high-performance liquid chromatography (HPLC) after chemical degradation. ITA and total melanin content were found correlated, ITA and PTCA (degradation product of DHICA melanin), and TTCA (degradation product of benzothiazole-type pheomelanin) as well but not 4-AHP (degradation product of benzothiazine-type pheomelanin). Results revealed that human epidermis comprises approximately 74% of eumelanin and 26% pheomelanin, regardless of the degree of pigmentation. They also confirm the low content of photoprotective eumelanin among lighter skins thereby explaining the higher sensitivity toward UV exposure.
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Affiliation(s)
| | - Shosuke Ito
- Department of Chemistry, Fujita Health University School of Health Sciences, Toyoake, Aichi, Japan
| | - Juliette Sok
- L'Oréal Research and Innovation, Aulnay-sous-Bois, France
| | - Yukiko Nakanishi
- Department of Chemistry, Fujita Health University School of Health Sciences, Toyoake, Aichi, Japan
| | | | - Kazumasa Wakamatsu
- Department of Chemistry, Fujita Health University School of Health Sciences, Toyoake, Aichi, Japan
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21
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Pericentral Hydroxychloroquine Retinopathy in Korean Patients. Ophthalmology 2015; 122:1252-6. [DOI: 10.1016/j.ophtha.2015.01.014] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2014] [Revised: 01/08/2015] [Accepted: 01/15/2015] [Indexed: 11/21/2022] Open
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22
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Guin T, Cho JH, Xiang F, Ellison CJ, Grunlan JC. Water-Based Melanin Multilayer Thin Films with Broadband UV Absorption. ACS Macro Lett 2015; 4:335-338. [PMID: 35596342 DOI: 10.1021/acsmacrolett.5b00080] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Natural melanin is difficult to process due to its poor solubility and poorly understood structure. Synthetic melanin has been produced more recently, which is dispersible in mildly alkaline water and has many of the same properties of natural melanin. In this study, thin films of synthetic melanin and poly(allylamine hydrochloride) were deposited layer-by-layer from dilute aqueous solutions in ambient conditions. This is likely the first time melanin has been deposited from water to produce a functional nanocoating. These films display broadband UV light absorption, absorbing over 63% of incident light that is most damaging to human eyes with a thickness of 108 nm. In an effort to demonstrate the utility of these melanin-based nanocoatings, a 30 bilayer film is shown to increase the useful life of a conductive poly(3,4-ethylenedioxythiophene)/poly(styrenesulfonate) (PEDOT/PSS) film by 550%. This novel method of depositing melanin should open the door to a variety of useful applications.
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Affiliation(s)
- Tyler Guin
- Department of Chemical Engineering, Texas A&M University, 3122 TAMU, College Station, Texas 77843, United States
| | | | - Fangming Xiang
- Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, Texas 77843, United States
| | | | - Jaime C. Grunlan
- Department of Mechanical Engineering, Texas A&M University, 3123 TAMU, College Station, Texas 77843, United States
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23
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Avril MF, Bahadoran P, Cabaret O, Caron O, de la Fouchardière A, Demenais F, Desjardins L, Frébourg T, Hammel P, Leccia MT, Lesueur F, Mahé E, Martin L, Maubec E, Remenieras A, Richard S, Robert C, Soufir N, Stoppa-Lyonnet D, Thomas L, Vabres P, Bressac-de Paillerets B. [Recommendations for genetic testing and management of individuals genetically at-risk of cutaneous melanoma]. Ann Dermatol Venereol 2014; 142:26-36. [PMID: 25600792 DOI: 10.1016/j.annder.2014.09.606] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 07/08/2014] [Accepted: 09/01/2014] [Indexed: 11/19/2022]
Abstract
Cutaneous melanoma is a multifactorial disease resulting from both environmental and genetic factors. Five susceptibility genes have been identified over the past years, comprising high-risk susceptibility genes (CDKN2A, CDK4, and BAP1 genes) and intermediate-risk susceptibility genes (MITF, and MC1R genes). The aim of this expert consensus was to define clinical contexts justifying genetic analyses, to describe the conduct of these analyses, and to propose surveillance recommendations. Given the regulatory constraints, it is recommended that dermatologists work in tandem with a geneticist. Genetic analysis may be prescribed when at least two episodes of histologically proven invasive cutaneous melanoma have been diagnosed before the age of 75 years in two 1st or 2nd degree relatives or in the same individual. The occurrence in the same individual or in a relative of invasive cutaneous melanoma with ocular melanoma, pancreatic cancer, renal cancer, mesothelioma or a central nervous system tumour are also indications for genetic testing. Management is based upon properly managed photoprotection and dermatological monitoring according to genetic status. Finally, depending on the mutated gene and the familial history, associated tumour risks require specific management (e.g. ocular melanoma, pancreatic cancer). Due to the rapid progress in genetics, these recommendations will need to be updated regularly.
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Affiliation(s)
- M-F Avril
- Service de dermatologie, groupe hospitalier Cochin-Saint-Vincent-de-Paul, AP-HP, pavillon Tarnier, 89, rue d'Assas, 75006 Paris, France
| | - P Bahadoran
- Inserm U895, service de dermatologie, hôpital Archet 2, CHU, 151, route Saint-Antoine-Ginestiere, BP 79, 06200 Nice cedex 3, France
| | - O Cabaret
- Service de génétique, département de biologie et pathologie médicales, Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif cedex, France
| | - O Caron
- Consultation d'oncogénétique, Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif, France
| | - A de la Fouchardière
- Département de biopathologie, centre Léon-Bérard, 28, rue Laennec, 69008 Lyon, France
| | - F Demenais
- Inserm, UMR946, variabilité génétique et maladies humaines, fondation Jean-Dausset, CEPH, 27, rue Juliette-Dodu, 75010 Paris, France
| | - L Desjardins
- Service d'ophtalmologie, institut Curie, 26, rue d'Ulm, 75231 Paris cedex 05, France
| | - T Frébourg
- Inserm U1079, service de génétique, CHU de Rouen, IRIB, faculté de médecine et de pharmacie, 22, boulevard Gambetta, 76183 Rouen cedex, France
| | - P Hammel
- Service de gastro-entérologie-pancréatologie, hôpital Beaujon, AP-HP, 100, boulevard du Général-Leclerc, 92118 Clichy cedex, France
| | - M-T Leccia
- Service de dermatologie, CHU Michallon, BP 217, 38043 Grenoble cedex 9, France
| | - F Lesueur
- Inserm U900, équipe épidémiologie génétique des cancers, institut Curie, 26, rue d'Ulm, 75248 Paris cedex 05, France
| | - E Mahé
- Service de dermatologie, centre hospitalier Victor-Dupouy, 69, rue du Lieutenant-Colonel-Prud'hon, 95107 Argenteuil cedex, France
| | - L Martin
- Service de dermatologie, CHU d'Angers, université d'Angers, 4, rue Larrey, 49933 Angers cedex 9, France
| | - E Maubec
- Inserm, UMR946, variabilité génétique et maladies humaines, fondation Jean-Dausset, CEPH, 27, rue Juliette-Dodu, 75010 Paris, France; Service de dermatologie, hôpital Bichat, AP-HP, 46, rue Henri-Huchard, 75018 Paris, France
| | - A Remenieras
- Département d'oncologie génétique, institut Paoli-Calmettes, 232, boulevard Saint-Marguerite, 13273 Marseille cedex 9, France
| | - S Richard
- Service d'urologie, hôpital Bicêtre, Centre expert national cancers rares INCa PREDIR, 78, rue du Général-Leclerc, 94275 Le Kremlin-Bicêtre cedex, France
| | - C Robert
- Service de dermatologie, Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif, France
| | - N Soufir
- Inserm U976, laboratoire de génétique moléculaire, unité fonctionnelle de génétique, hôpital Xavier-Bichat-Claude-Bernard, AP-HP, Paris 7 université, 75018 Paris, France
| | - D Stoppa-Lyonnet
- Inserm U830, service de génétique, département de biologie des tumeurs, institut Curie, 26, rue d'Ulm, 75231 Paris cedex 05, France
| | - L Thomas
- Service de dermatologie, centre hospitalier Lyon Sud, université Lyon 1, 165, chemin du Grand-Revoyet, 69495 Pierre-Bénite cedex, France
| | - P Vabres
- Service de dermatologie, CHU de Dijon, BP 77908, 21079 Dijon cedex, France
| | - B Bressac-de Paillerets
- Service de génétique, département de biologie et pathologie médicales, Gustave-Roussy, 114, rue Édouard-Vaillant, 94805 Villejuif cedex, France.
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Meierjohann S. Oxidative stress in melanocyte senescence and melanoma transformation. Eur J Cell Biol 2013; 93:36-41. [PMID: 24342719 DOI: 10.1016/j.ejcb.2013.11.005] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 11/15/2013] [Accepted: 11/15/2013] [Indexed: 10/26/2022] Open
Abstract
Melanoma is a severe type of skin cancer with a high metastasis potential and poor survival rates once metastasized. The causes of melanoma formation are multifactorial and not fully understood. Several signaling cascades such as the RAS/RAF/ERK1/2 pathway, the PI3K/AKT pathway, RAC1 and NF-κB are involved in melanoma initiation and progression. Reactive oxygen species (ROS) are induced by these signal transduction cascades, and they play a fundamental role in melanomagenic processes. Cells derived from the melanocytic lineage are particularly sensitive to an increase in ROS, and thus, melanoma cells rely on efficient antioxidant measures. This review summarizes the causes and consequences of ROS generation in melanocytes and melanoma and discusses the potential of pro-oxidant therapy in melanoma treatment.
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Affiliation(s)
- Svenja Meierjohann
- University of Wurzburg, Department of Physiological Chemistry I, Biocenter, Am Hubland, 97074, Wurzburg, Germany; Comprehensive Cancer Center Mainfranken, University Clinic Würzburg, 97078, Würzburg, Germany.
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25
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Wünsche J, Cicoira F, Graeff CFO, Santato C. Eumelanin thin films: solution-processing, growth, and charge transport properties. J Mater Chem B 2013; 1:3836-3842. [DOI: 10.1039/c3tb20630k] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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26
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Löfgren S, Michael R, Söderberg PG. Impact of iris pigment and pupil size in ultraviolet radiation cataract in rat. Acta Ophthalmol 2012; 90:44-8. [PMID: 20346084 DOI: 10.1111/j.1755-3768.2010.01871.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
PURPOSE To investigate the effect of iris pigment and pupil size in ultraviolet radiation (UVR)-induced cataract. METHODS Brown-Norway rats (pigmented) and Fischer-344 rats (non-pigmented) were unilaterally exposed in vivo to 5 kJ/m(2) UVR. Each strain was split into two groups, each receiving either mydriatic (tropicamide) or miotic (pilocarpine) eye-drops. One week after exposure, the degree of ocular inflammation and damage in the anterior segment was determined. The lenses were extracted, photographed and the degree of forward light scattering (cataract) was quantified. RESULTS The cataract types differed between the two strains. All Fischer rats developed macroscopically identifiable UVR cataract while only 41% of Brown-Norway rats did so. All groups except the miotic Brown-Norway developed significant light scattering. The Fischer rats developed 3-4-fold more lens light scattering than the Brown-Norway rats. The miotic Fischer group exhibited significantly more light scattering than the mydriatic Fischer group. There was no significant difference in light scattering between the two Brown-Norway groups. There was a correlation between ocular inflammation and degree of light scattering, with Brown-Norway rats exhibiting less inflammation and lens light scattering. CONCLUSIONS Pigmented rats develop less UVR cataract and less ocular inflammation than non-pigmented rats. Pupil size plays a smaller role in UVR cataract development in pigmented rats than in non-pigmented. The role of UVR-induced ocular inflammation in cataract development is still ambiguous.
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Affiliation(s)
- Stefan Löfgren
- Karolinska Institutet, St. Erik's Eye Hospital, Stockholm, Sweden.
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27
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Fernandez AA, Paniker L, Garcia R, Mitchell DL. Recent advances in sunlight-induced carcinogenesis using the Xiphophorus melanoma model. Comp Biochem Physiol C Toxicol Pharmacol 2012; 155:64-70. [PMID: 21457786 PMCID: PMC3164944 DOI: 10.1016/j.cbpc.2011.03.007] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2011] [Revised: 03/23/2011] [Accepted: 03/23/2011] [Indexed: 01/25/2023]
Abstract
Unlike breast and prostate cancers, the nature and sequence of critical genetic and epigenetic events involved in the initiation and progression of melanoma are not well understood. A contributing factor to this dilemma, especially given our current understanding of the importance of UV light in melanoma etiology, is the lack of quality UV-inducible melanoma animal models. In this study we elaborate on the capability of UV light to induce cutaneous malignant melanomas (CMM) in Xiphophorus fishes, which were previously found to develop melanomas after acute neonatal UVB irradiation. In two separate tumorigenesis experiments, we exposed adult Xiphophorus hybrids to either acute UVB irradiations (5 consecutive daily treatments) or chronic solar irradiations (continuous UVA/UVB treatment for 9 months). Acute adult UVB irradiation resulted in the significant induction of melanomas, and moreover, this induction rate is equivalent to that of animals exposed to acute neonatal UVB irradiation. This study represents the first evidence that acute adult UVB irradiation, in the absence of any early life exposures, induces CMM. Similar to the findings conducted on other divergent melanoma models, including HGF/SF transgenic mice and Monodelphis domestica, prolonged chronic solar UV was not a factor in melanomagenesis.
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Affiliation(s)
- André A Fernandez
- The University of Texas MD Anderson Cancer Center, Department of Carcinogenesis, 1808 Park Road 1C, Smithville, TX 78957, USA.
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Mitchell D, Fernandez A. The photobiology of melanocytes modulates the impact of UVA on sunlight-induced melanoma. Photochem Photobiol Sci 2012; 11:69-73. [DOI: 10.1039/c1pp05146f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Onojafe IF, Adams DR, Simeonov DR, Zhang J, Chan CC, Bernardini IM, Sergeev YV, Dolinska MB, Alur RP, Brilliant MH, Gahl WA, Brooks BP. Nitisinone improves eye and skin pigmentation defects in a mouse model of oculocutaneous albinism. J Clin Invest 2011; 121:3914-23. [PMID: 21968110 DOI: 10.1172/jci59372] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2011] [Accepted: 08/03/2011] [Indexed: 11/17/2022] Open
Abstract
Mutation of the tyrosinase gene (TYR) causes oculocutaneous albinism, type 1 (OCA1), a condition characterized by reduced skin and eye melanin pigmentation and by vision loss. The retinal pigment epithelium influences postnatal visual development. Therefore, increasing ocular pigmentation in patients with OCA1 might enhance visual function. There are 2 forms of OCA1, OCA-1A and OCA-1B. Individuals with the former lack functional tyrosinase and therefore lack melanin, while individuals with the latter produce some melanin. We hypothesized that increasing plasma tyrosine concentrations using nitisinone, an FDA-approved inhibitor of tyrosine degradation, could stabilize tyrosinase and improve pigmentation in individuals with OCA1. Here, we tested this hypothesis in mice homozygous for either the Tyrc-2J null allele or the Tyrc-h allele, which model OCA-1A and OCA-1B, respectively. Only nitisinone-treated Tyrc-h/c-h mice manifested increased pigmentation in their fur and irides and had more pigmented melanosomes. High levels of tyrosine improved the stability and enzymatic function of the Tyrc-h protein and also increased overall melanin levels in melanocytes from a human with OCA-1B. These results suggest that the use of nitisinone in OCA-1B patients could improve their pigmentation and potentially ameliorate vision loss.
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Affiliation(s)
- Ighovie F Onojafe
- Unit on Pediatric, Developmental, and Genetic Eye Disease, National Eye Institute, NIH, Bethesda, Maryland 20892, USA
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Saha A, Arora R, Yakovlev VV, Burke JM. Raman microspectroscopy of melanosomes: the effect of long term light irradiation. JOURNAL OF BIOPHOTONICS 2011; 4:805-813. [PMID: 21800432 DOI: 10.1002/jbio.201100008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2011] [Revised: 06/16/2011] [Accepted: 06/17/2011] [Indexed: 05/31/2023]
Abstract
Melanosomes are long lived organelles in retinal pigment epithelium cells and are primarily responsible for photoprotection. However, with aging or prolong light radiation, the function of melanosomes diminishes, which may be due to photobleaching of melanin pigments present in melanosomes. In this study, melanosomes were isolated from the retinal pigment epithelium cells and exposed to green light (532 nm), and the chemical changes were monitored using Raman microspectroscopy. Photochemical changes were recorded for different power levels and exposure times. The threshold power and the rate for irreversible photobleaching of melanosomes were calculated by fitting the experimental data with a proposed model.
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Affiliation(s)
- Anushree Saha
- School of Medicine, Case Western Reserve University, 2085 Adelbert Road, OH 44106, USA.
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Affiliation(s)
- Mikhail Y. Berezin
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
| | - Samuel Achilefu
- Department of Radiology, Washington University School of Medicine, 4525 Scott Ave, St. Louis, USA, Tel. 314-747-0701, 314-362-8599, fax 314-747-5191
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Kim JH, Sim GS, Bae JT, Oh JY, Lee GS, Lee DH, Lee BC, Pyo HB. Synthesis and anti-melanogenic effects of lipoic acid-polyethylene glycol ester. J Pharm Pharmacol 2010; 60:863-70. [DOI: 10.1211/jpp.60.7.0007] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Abstract
To develop a new potent anti-melanogenic agent, we have conjugated lipoic acid (LA) to poly (ethylene) glycol (PEG) of molecular weight 2000 and examined the effects on inhibition of tyrosinase activity and melanin synthesis in B16F10 melanoma cells. The water-soluble LA-PEG 2000 was synthesized from LA and methylated PEG by an esterification reaction in the presence of 1-ethyl-3-(3-dimethylaminopropyl)-carbodiimide. Synthetic LA-PEG 2000 was confirmed by IR and 1H-NMR spectroscopy. The new conjugate is a highly water-soluble molecule, which has lower cell cytotoxicity than LA. Treatment with LA-PEG 2000 significantly suppressed the biosynthesis of melanin by up to 63% at 0.25 mm and reduced tyrosinase activity by up to 80% at 0.50 mm in B16F10 melanoma cells. Furthermore, Western blot and RT-PCR studies indicated that treatment with LA-PEG 2000 decreased the level of tyrosinase, which is a melanogenic enzyme. Taken together, these results suggest that LA-PEG 2000 may inhibit melanin biosynthesis by down-regulating levels and expression of tyrosinase activity. Therefore, LA-PEG 2000 can be used effectively as a new agent to inhibit mel-anogenesis, with lower cytotoxicity than LA (parent molecule) in B16F10 melanoma cells.
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Affiliation(s)
- Jin-Hwa Kim
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Gwan-Sub Sim
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Jun-Tae Bae
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Jung-Young Oh
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Geun-Su Lee
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Dong-Hwan Lee
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
| | - Bum-Chun Lee
- Department of Biochemistry and Molecular Biology, Faculty of Medicine, Tupper Medical Building, Dalhousie University, 5850 College St., Halifax, Nova Scotia B3H 1×5, Canada
| | - Hyeong-Bae Pyo
- R&D Center, Hanbul Cosmetics Co. Ltd, 72-7, Yongsung-ri, Samsung-myun, Umsung-kun, Chungbuk 369-834, Korea
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Eichhorn R, Wessler G, Scholz M, Leupold D, Stankovic G, Buder S, Stücker M, Hoffmann K. Early diagnosis of melanotic melanoma based on laser-induced melanin fluorescence. JOURNAL OF BIOMEDICAL OPTICS 2009; 14:034033. [PMID: 19566326 DOI: 10.1117/1.3155511] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Because of the increasing incidence of skin cancer, interest in using the autofluorescence of skin tissue as a noninvasive tool for early diagnosis is enforced. Focus is especially on malignant melanotic melanoma. On the basis of a newly developed method to selectively excite melanin fluorescence of skin tissue by stepwise two-photon excitation with nanosecond laser pulses at 810 nm, we have investigated information from this melanin fluorescence with respect to the differentiation of pigmented lesions. A distinct difference in the melanin fluorescence spectrum of malignant melanoma (including melanoma in situ) when compared to that of benign melanocytic lesions (i.e., common nevi) has been found for freshly excised samples as well as for histopathological samples. There is also specific fluorescence from dysplastic nevi. In this way, early detection of malignant melanoma is possible.
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Smit NPM, van Nieuwpoort FA, Marrot L, Out C, Poorthuis B, van Pelt H, Meunier JR, Pavel S. Increased melanogenesis is a risk factor for oxidative DNA damage--study on cultured melanocytes and atypical nevus cells. Photochem Photobiol 2008; 84:550-5. [PMID: 18435613 DOI: 10.1111/j.1751-1097.2007.00242.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Melanin synthesis is an oxygen-dependent process that acts as a potential source of reactive oxygen species (ROS) inside pigment-forming cells. The synthesis of the lighter variant of melanin, pheomelanin, consumes cysteine and this may limit the capacity of the cellular antioxidative defense. We show that tyrosine-induced melanogenesis in cultured normal human melanocytes (NHM) is accompanied by increased production of ROS and decreased concentration of intracellular glutathione. Clinical atypical (dysplastic) nevi (DN) regularly contain more melanin than do normal melanocytes (MC). We also show that in these cultured DN cells three out of four exhibit elevated synthesis of pheomelanin and this is accompanied by their early senescence. By using various redox-sensitive molecular probes, we demonstrate that cultured DN cells produce significantly more ROS than do normal MC from the same donor. Our experiments employing single-cell gel electrophoresis (comet assay) usually reveal higher fragmentation of DNA in DN cells than in normal MC. Even if in some cases the normal alkaline comet assay shows no differences in DNA fragmentation between DN cells and normal MC, the use of the comet assay with formamidopyrimidine DNA glycosylase can disclose that the DNA of the cultured DN cells harbor more oxidative damage than the DNA of normal MC from the same person.
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Affiliation(s)
- Nico P M Smit
- Department of Clinical Chemistry, Leiden University Medical Center, Leiden, The Netherlands.
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35
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Yamaguchi Y, Beer JZ, Hearing VJ. Melanin mediated apoptosis of epidermal cells damaged by ultraviolet radiation: factors influencing the incidence of skin cancer. Arch Dermatol Res 2008; 300 Suppl 1:S43-50. [PMID: 17985102 DOI: 10.1007/s00403-007-0807-0] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Ultraviolet (UV)-induced skin cancers, including melanomas and basal/squamous cell carcinomas, occur more frequently in individuals with fair skin than in those with dark skin. Melanin plays an important role in protecting the skin against UV radiation and levels of melanin correlate inversely with amounts of DNA damage induced by UV in human skin of different racial/ethnic groups. The objectives of this study are to review recent progress in our understanding of mechanisms underlying differences in cancer incidence in skins of different colors, particularly between Black and White skin. More specifically, we review DNA damage and apoptosis in various types of skin before and after exposure to UV in our human study protocols using a single UV dose, either one minimal erythema dose (MED) or a similar low dose of 180-200 J/m2. Our data and other published reports indicate that several major mechanisms underlie the increased rates of photocarcinogenesis in fair/light skin. First, UV-induced DNA damage in the lower epidermis (including keratinocyte stem cells and melanocytes) is more effectively prevented in darker skin. Second, rates of repair of DNA damage can differ significantly in individuals. Third, UV-induced apoptosis to remove potentially precancerous cells is significantly greater in darker skin. These results suggest that pigmented epidermis is an efficient UV filter and that UV damaged cells are removed more efficiently in darker skin. The combination of decreased DNA damage and more efficient removal of UV-damaged cells may play a critical role in the decreased photocarcinogenesis seen in individuals with darker skin.
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Affiliation(s)
- Yuji Yamaguchi
- Pigment Cell Research Section, Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA.
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36
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Riesz JJ, Gilmore JB, McKenzie RH, Powell BJ, Pederson MR, Meredith P. Transition dipole strength of eumelanin. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2007; 76:021915. [PMID: 17930073 DOI: 10.1103/physreve.76.021915] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/07/2007] [Indexed: 05/25/2023]
Abstract
We report the transition dipole strength of eumelanin (the principal human photoprotective pigment) in the ultraviolet and visible. We have used both theoretical (density functional) and experimental methods to show that eumelanin is not an unusually strong absorber amongst organic chromophores. This is somewhat surprising given its role as a photoprotectant, and suggests that the dark coloring in vivo (and in vitro) of the eumelanin pigment is a concentration effect. Furthermore, by observing the polymerization of a principle precursor (5,6-dihydroxyindole-2-carboxylic acid) into the full pigment, we observe that eumelanin exhibits a small amount (approximately 20%) of hyperchromism (i.e., the reaction process enhances the light absorption ability of the resultant macromolecule relative to its monomeric precursor). These results have significant implications for our understanding of the photophysics of these important functional biomolecules. In particular, they appear to be consistent with the recently proposed chemical disorder secondary structure model of eumelanins.
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Affiliation(s)
- J J Riesz
- Condensed Matter Physics Group, Physics Department, University of Queensland, St. Lucia, Brisbane, QLD 4072, Australia.
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37
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Yoon HS, Kim JK, Kim SJ. The inhibitory effect on the melanin synthesis in B16/F10 mouse melanoma cells by Sasa quelpaertensis leaf extract. ACTA ACUST UNITED AC 2007. [DOI: 10.5352/jls.2007.17.6.873] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Liu Y, Hong L, Wakamatsu K, Ito S, Adhyaru B, Cheng CY, Bowers CR, Simon JD. Comparison of Structural and Chemical Properties of Black and Red Human Hair Melanosomes¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb01532.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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39
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Meador JA, Walter RB, Mitchell DL. Induction, Distribution and Repair of UV Photodamage in the Platyfish, Xiphophorus signum¶. Photochem Photobiol 2007. [DOI: 10.1562/0031-8655(2000)0720260idarou2.0.co2] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Marrot L, Belaïdi JP, Jones C, Perez P, Meunler JR. Molecular Responses to Stress Induced in Normal Human Caucasian Melanocytes in Culture by Exposure to Simulated Solar UV¶. Photochem Photobiol 2007. [DOI: 10.1111/j.1751-1097.2005.tb00196.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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41
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Miyamura Y, Coelho SG, Wolber R, Miller SA, Wakamatsu K, Zmudzka BZ, Ito S, Smuda C, Passeron T, Choi W, Batzer J, Yamaguchi Y, Beer JZ, Hearing VJ. Regulation of human skin pigmentation and responses to ultraviolet radiation. ACTA ACUST UNITED AC 2007; 20:2-13. [PMID: 17250543 DOI: 10.1111/j.1600-0749.2006.00358.x] [Citation(s) in RCA: 161] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Pigmentation of human skin is closely involved in protection against environmental stresses, in particular exposure to ultraviolet (UV) radiation. It is well known that darker skin is significantly more resistant to the damaging effects of UV, such as photocarcinogenesis and photoaging, than is lighter skin. Constitutive skin pigmentation depends on the amount of melanin and its distribution in that tissue. Melanin is significantly photoprotective and epidermal cells in darker skin incur less DNA damage than do those in lighter skin. This review summarizes current understanding of the regulation of constitutive human skin pigmentation and responses to UV radiation, with emphasis on physiological factors that influence those processes. Further research is needed to characterize the role of skin pigmentation to reduce photocarcinogenesis and to develop effective strategies to minimize such risks.
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Affiliation(s)
- Yoshinori Miyamura
- Laboratory of Cell Biology, National Cancer Institute, National Institutes of Health, Bethesda, MD, USA
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Liu Y, Hong L, Wakamatsu K, Ito S, Adhyaru B, Cheng CY, Bowers CR, Simon JD. Comparison of structural and chemical properties of black and red human hair melanosomes. Photochem Photobiol 2005; 81:135-44. [PMID: 15504086 DOI: 10.1562/2004-08-03-ra-259.1] [Citation(s) in RCA: 134] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Melanosomes in black and red human hair are isolated and characterized by various chemical and physical techniques. Different yields of 4-amino-hydroxyphenolanaline by HI hydrolysis (a marker for pheomelanin) and pyrrole-2,3,5-tricarboxylic acid by KMnO(4)/H(+) oxidation (a marker for eumelanin) indicate that the melanosomes in black hair are eumelanosomes, whereas those in red hair are mainly pheomelanosomes. Atomic force microscopy reveals that eumelanosomes and pheomelanosomes have ellipsoidal and spherical shapes, respectively. Eumelanosomes maintain structural integrity upon extraction from the keratin matrix, whereas pheomelanosomes tend to fall apart. The black-hair eumelanosomes have an average of 14.6 +/- 0.5% amino acids content, which is attributed to the internal proteins entrapped in the melanosomes granules. The red-hair melanosomes contain more than 44% of amino acid content even after extensive proteolytic digestion. This high content of amino acids and the poorly reserved integrity of red-hair melanosomes suggest that some proteins are possibly covalently bonded with the melanin constituents in addition to those that are entrapped inside the melanin species. Soluene solubilization assay indicates the absorbance of melanin per gram of sample, adjusted for the amino acid content, is a factor of 2.9 greater for the black-hair melanosomes than the red-hair melanosomes. Metal analysis reveals significant amounts of diverse heavy metal ions bound to the two types of melanosomes. The amount of Cu(II) and Zn(II) are similar but Fe(III) content is four times higher in the red-hair melanosomes. (13)C solid-state nuclear magnetic resonance spectra and infrared spectra are presented and are shown to be powerful techniques for discerning differences in the amino acid contents, the 5,6-dihydroxyindole-2-carboxylic acid:5,6-dihydroxyindole ratio, and the degree of cross-linking in the pigment. Excellent agreement is observed between these spectral results and the chemical degradation data.
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Affiliation(s)
- Yan Liu
- Department of Chemistry, Duke University, Durham, NC 27708, USA
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Asplund A, Gustafsson AC, Wikonkal NM, Sela A, Leffell DJ, Kidd K, Lundeberg J, Brash DE, Pontén F. PTCH codon 1315 polymorphism and risk for nonmelanoma skin cancer. Br J Dermatol 2005; 152:868-73. [PMID: 15888139 DOI: 10.1111/j.1365-2133.2005.06464.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND The PTCH tumour suppressor gene is involved in the development of nearly all basal cell carcinomas (BCCs) of the skin and a fraction of squamous cell carcinomas (SCCs). A nonconservative Pro/Leu nucleotide polymorphism within PTCH exon 23 at codon 1315 was recently reported to be potentially important for the development of breast epithelial cell cancers. Objectives Accordingly, the status of PTCH codon 1315 was analysed for a possible association with the development of nonmelanoma skin cancers (NMSCs) in a pilot study. Because skin cancer risk is affected by specific population-dependent phenotypes such as skin and hair colour, codon 1315 was also analysed for normal allele frequency variation in human populations having differing extents of eumelanin vs. phaeomelanin. METHODS The single nucleotide polymorphism in codon 1315 of the human PTCH gene was analysed in genomic DNA from six different populations comprising 472 blood samples and from 170 patients in four different categories with NMSC. Polymerase chain reaction and pyrosequencing were used to determine the allele frequencies. Allelic loss was furthermore determined in tumours following microdissection. RESULTS The Pro/Pro genotype frequency ranged from 30% to 65% between populations, with a significant trend for a reduced frequency of the Pro/Pro genotype in populations having lighter pigmentation (P = 0.020). Pro/Pro frequency showed an increasing trend with increasing tumour case severity (P = 0.027). In 260 samples from 180 Swedish patients with NMSC and a control group of 96 healthy ethnically matched volunteers, no statistically significant pairwise differences between groups were detected in the PTCH codon 1315 allelic distribution, neither was a difference seen for multiple or early onset cases of BCC in the Swedish population. In Swedish patients with single tumours, allelic loss (loss of heterozygosity) was observed in 20 of 30 (67%) patients with BCC and four of 22 (18%) patients with SCC, with no preference in the allele lost. In contrast, the Pro/Pro genotype was frequent in seven U.S. patients having multiple independent BCCs. One of these patients was heterozygous, enabling allelic loss studies. Of 20 independent tumours, 11 had lost an allele; 10 of the 11 had lost Leu, suggesting nonrandom loss that favoured retention of Pro (P = 0.0059). CONCLUSIONS Our results indicate an association between the eumelanin-to-phaeomelanin shift and a shift from the Pro/Pro genotype to Leu-containing genotypes. Failure to lose Pro during the shift to phaeomelanin may be associated with an increased population risk for BCC and increased individual risk for multiple BCC. During development of a tumour, the effect of Pro may be magnified by loss of the Leu allele.
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Affiliation(s)
- A Asplund
- Department of Biotechnology, Royal Institute of Technology, AlbaNova University Centre, Roslagstullsbacken 21, 106 91 Stockholm, Sweden
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Chan JL, Ehrlich A, Lawrence RC, Moshell AN, Turner ML, Kimball AB. Assessing the role of race in quantitative measures of skin pigmentation and clinical assessments of photosensitivity. J Am Acad Dermatol 2005; 52:609-15. [PMID: 15793510 DOI: 10.1016/j.jaad.2004.03.051] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
BACKGROUND Given the increasing demographic diversity in the United States, clarifying relationships between race, color, ethnicity, and disease processes is critical. OBJECTIVES We sought to examine the correlation between objective measures of skin pigmentation, racial identification, and physician-diagnosed and self-reported skin phototypes. METHODS A total of 558 participants (76 nonwhite) were evaluated. A subset underwent spectrometric readings and digital photography of the upper aspect of the inner arm. Self-identified race was compared with 7 measures of pigmentation. RESULTS Race correlates best with physician-diagnosed skin phototype (r = 0.55, P < .01), whereas self-reported skin phototype, spectrometry, and colorimetry correlate poorly with race (r = 0.28, < 0.40, and r > -0.31, respectively, P < .01). Associations between race and subjective measures strengthen among patients with darker skin. CONCLUSION Objective measures of pigmentation fail to correlate well with race, whereas race correlates moderately with physician-diagnosed skin phototype. Including objective methods of analyzing skin color may reduce subjective influences of race in assessing photosensitivity and potential risk for skin cancer.
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Affiliation(s)
- Joanna L Chan
- Department of Dermatology, Stanford University Medical Center, Stanford, California, USA
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Marrot L, Belaïdi JP, Jones C, Perez P, Meunier JR. Molecular Responses to Stress Induced in Normal Human Caucasian Melanocytes in Culture by Exposure to Simulated Solar UV¶. Photochem Photobiol 2005. [DOI: 10.1562/2004-10-13-ra-343.1] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Harbour JW, Brantley MA, Hollingsworth H, Gordon M. Association between choroidal pigmentation and posterior uveal melanoma in a white population. Br J Ophthalmol 2004; 88:39-43. [PMID: 14693770 PMCID: PMC1771924 DOI: 10.1136/bjo.88.1.39] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND/AIMS It is well known that light skin pigmentation is a risk factor for cutaneous melanoma. The aim of this study was to investigate the analogous association between choroidal pigmentation and posterior uveal melanoma. METHODS Cross sectional study of 65 consecutive patients diagnosed with posterior uveal melanoma (melanoma group) and 218 consecutive patients referred for general retinal evaluation (control group). All patients were white. A clinical grading system for estimating choroidal pigmentation was developed and histologically validated in seven patients. RESULTS Melanoma patients with light iris colour were significantly more likely to have darker choroidal pigmentation than controls (p = 0.005). Darker choroidal pigmentation was associated histologically with increased density of choroidal melanocytes (p = 0.005). CONCLUSIONS Increased choroidal pigmentation, as a result of an increase in the density of pigmented choroidal melanocytes, is not protective but may actually be a risk factor for the development of posterior uveal melanoma in white patients. This finding may have implications for understanding the pathogenesis of uveal melanoma.
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Affiliation(s)
- J W Harbour
- Department of Ophthalmology and Visual Sciences, Washington University School of Medicine, Box 8069, 660 S. Euclid Avenue, St Louis, MO 63110, USA.
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Marrot L, Belaïdi JP, Jones C, Perez P, Riou L, Sarasin A, Meunier JR. Molecular responses to photogenotoxic stress induced by the antibiotic lomefloxacin in human skin cells: from DNA damage to apoptosis. J Invest Dermatol 2003; 121:596-606. [PMID: 12925221 DOI: 10.1046/j.1523-1747.2003.12422.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Photo-unstable chemicals sometimes behave as phototoxins in skin, inducing untoward clinical side-effects when exposed to sunlight. Some drugs, such as psoralens or fluoroquinolones, can damage genomic DNA, thus increasing the risk of photocarcinogenesis. Here, lomefloxacin, an antibiotic from the fluoroquinolone family known to be involved in skin tumor development in photoexposed mice, was studied using normal human skin cells in culture: fibroblasts, keratinocytes, and Caucasian melanocytes. When treated cells were exposed to simulated solar ultraviolet A (320-400 nm), lomefloxacin induced damage such as strand breaks and pyrimidine dimers in genomic DNA. Lomefloxacin also triggered various stress responses: heme-oxygenase-1 expression in fibroblasts, changes in p53 status as shown by the accumulation of p53 and p21 proteins or the induction of MDM2 and GADD45 genes, and stimulation of melanogenesis by increasing the tyrosinase activity in melanocytes. Lomefloxacin could also lead to apoptosis in keratinocytes exposed to ultraviolet A: caspase-3 was activated and FAS-L gene was induced. Moreover, keratinocytes were shown to be the most sensitive cell type to lomefloxacin phototoxic effects, in spite of the well-established effectiveness of their antioxidant equipment. These data show that the phototoxicity of a given drug can be driven by different mechanisms and that its biologic impact varies according to cell type.
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Affiliation(s)
- Laurent Marrot
- Genotoxicity Group, L'Oreal Research, 1 avenue Eugene Schueller, 93600 Aulnay-sous-bois, France.
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Sturm RA, Duffy DL, Box NF, Chen W, Smit DJ, Brown DL, Stow JL, Leonard JH, Martin NG. The role of melanocortin-1 receptor polymorphism in skin cancer risk phenotypes. PIGMENT CELL RESEARCH 2003; 16:266-72. [PMID: 12753400 DOI: 10.1034/j.1600-0749.2003.00041.x] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We have examined melanocortin-1 receptor (MC1R) variant allele frequencies in the general population and in a collection of adolescent dizygotic and monozygotic twins to determine statistical associations of pigmentation phenotypes with increased skin cancer risk. This included hair and skin color, freckling, mole count and sun exposed skin reflectance. Nine variants were studied and designated as either strong R (OR = 63; 95% CI 32-140) or weak r (OR = 5; 95% CI 3-11) red hair alleles. Penetrance of each MC1R variant allele was consistent with an allelic model where effects were multiplicative for red hair but additive for skin reflectance. To assess the interaction of the brown eye color gene BEY2/OCA2 on the phenotypic effects of variant MC1R alleles we imputed OCA2 genotype in the twin collection. A modifying effect of OCA2 on MC1R variant alleles was seen on constitutive skin color, freckling and mole count. In order to study the individual effects of these variants on pigmentation phenotype we have established a series of human primary melanocyte strains genotyped for the MC1R receptor. These include strains which are MC1R wild-type consensus, variant heterozygotes, and homozygotes for strong R alleles Arg151Cys and Arg160Trp. Ultrastructural analysis demonstrated that only consensus strains contained stage III and IV melanosomes in their terminal dendrites whereas Arg151Cys and Arg160Trp homozygous strains contained only immature stage I and II melanosomes. Such genetic association studies combined with the functional analysis of MC1R variant alleles in melanocytic cells should provide a link in understanding the association between pigmentary phototypes and skin cancer risk.
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Affiliation(s)
- Richard A Sturm
- Institute for Molecular Bioscience, University of Queensland, Brisbane, Queensland, Australia.
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Abstract
Ocular morphology is specifically directed at facilitating the transmittance of visible light to the retina for the purposes of photoreceptor absorption and phototransduction, thereby initiating the process of vision. By absorbing excess radiation, melanin significantly enhances this process. It can also act as a photoprotector by quenching reactive oxygen species and other radicals produced as a result of the high oxygen dependency of the retina for its metabolism. However, melanin also binds numerous pharmaceuticals, a process that can result in ocular toxicity. Although our understanding of this binding remains somewhat limited, melanin chemistry, its distribution, and other factors influencing binding appear to play a significant role in predisposing ocular tissues, such as the choroid and retinal pigment epithelium, to toxicological insult. Many of the drugs that have been identified as causing these effects are known photosensitizers in which radiation plays a significant role in eliciting the pathologies. The phototoxic effects range from minor histological/chemical changes, which do not impact the quality of vision, to pigmentary retinopathies, which could potentially involve the loss of sight. Such effects, resulting from photosensitizer-drug binding to melanin, are to be separated from toxic effects, such as some ganglion cell abnormalities, that result from pharmaceuticals affecting ocular tissues directly.
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Affiliation(s)
- Pierrette Dayhaw-Barker
- Hafter Light and Laser Institute, Pennsylvania College of Optometry, Elkins Park, Pennsylvania 19027, USA.
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Melanocyte destruction and repigmentation in vitiligo: A model for nerve cell damage and regrowth. J Biomed Sci 2002. [DOI: 10.1007/bf02254984] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022] Open
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