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Chen Z, Li Y, Tan X, Nie S, Chen B, Mei X, Wu Z. Dysregulated tryptophan metabolism and AhR pathway contributed to CXCL10 upregulation in stable non-segmental vitiligo. J Dermatol Sci 2024:S0923-1811(24)00133-6. [PMID: 38955622 DOI: 10.1016/j.jdermsci.2024.06.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2024] [Revised: 05/21/2024] [Accepted: 06/14/2024] [Indexed: 07/04/2024]
Abstract
BACKGROUND Tryptophan metabolism dysregulation has been observed in vitiligo. However, drawing a mechanistic linkage between this metabolic disturbance and vitiligo pathogenesis remains challenging. OBJECTIVE Aim to reveal the characterization of tryptophan metabolism in vitiligo and investigate the role of tryptophan metabolites in vitiligo pathophysiology. METHODS LC-MS/MS, dual-luciferase reporter assay, ELISA, qRT-PCR, small interfering RNA, western blotting, and immunohistochemistry were employed. RESULTS Kynurenine pathway activation and KYAT enzyme-associated deviation to kynurenic acid (KYNA) in the plasma of stable non-segmental vitiligo were determined. Using a public microarray dataset, we next validated the activation of kynurenine pathway was related with inflammatory-related genes expression in skin of vitiligo patients. Furthermore, we found that KYNA induced CXCL10 upregulation in keratinocytes via AhR activation. Moreover, the total activity of AhR agonist was increased while the AhR concentration per se was decreased in the plasma of vitiligo patients. Finally, higher KYAT, CXCL10, CYP1A1 and lower AhR expression in vitiligo lesional skin were observed by immunohistochemistry staining. CONCLUSION This study depicts the metabolic and genetic characterizations of tryptophan metabolism in vitiligo and proposes that KYNA, a tryptophan-derived AhR ligand, can enhance CXCL10 expression in keratinocytes.
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Affiliation(s)
- Zile Chen
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yiting Li
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xi Tan
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Shu Nie
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Bin Chen
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Xingyu Mei
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Zhouwei Wu
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
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2
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Kim TK, Slominski RM, Pyza E, Kleszczynski K, Tuckey RC, Reiter RJ, Holick MF, Slominski AT. Evolutionary formation of melatonin and vitamin D in early life forms: insects take centre stage. Biol Rev Camb Philos Soc 2024. [PMID: 38686544 DOI: 10.1111/brv.13091] [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: 11/24/2023] [Revised: 04/11/2024] [Accepted: 04/17/2024] [Indexed: 05/02/2024]
Abstract
Melatonin, a product of tryptophan metabolism via serotonin, is a molecule with an indole backbone that is widely produced by bacteria, unicellular eukaryotic organisms, plants, fungi and all animal taxa. Aside from its role in the regulation of circadian rhythms, it has diverse biological actions including regulation of cytoprotective responses and other functions crucial for survival across different species. The latter properties are also shared by its metabolites including kynuric products generated by reactive oxygen species or phototransfomation induced by ultraviolet radiation. Vitamins D and related photoproducts originate from phototransformation of ∆5,7 sterols, of which 7-dehydrocholesterol and ergosterol are examples. Their ∆5,7 bonds in the B ring absorb solar ultraviolet radiation [290-315 nm, ultraviolet B (UVB) radiation] resulting in B ring opening to produce previtamin D, also referred to as a secosteroid. Once formed, previtamin D can either undergo thermal-induced isomerization to vitamin D or absorb UVB radiation to be transformed into photoproducts including lumisterol and tachysterol. Vitamin D, as well as the previtamin D photoproducts lumisterol and tachysterol, are hydroxylated by cyochrome P450 (CYP) enzymes to produce biologically active hydroxyderivatives. The best known of these is 1,25-dihydroxyvitamin D (1,25(OH)2D) for which the major function in vertebrates is regulation of calcium and phosphorus metabolism. Herein we review data on melatonin production and metabolism and discuss their functions in insects. We discuss production of previtamin D and vitamin D, and their photoproducts in fungi, plants and insects, as well as mechanisms for their enzymatic activation and suggest possible biological functions for them in these groups of organisms. For the detection of these secosteroids and their precursors and photoderivatives, as well as melatonin metabolites, we focus on honey produced by bees and on body extracts of Drosophila melanogaster. Common biological functions for melatonin derivatives and secosteroids such as cytoprotective and photoprotective actions in insects are discussed. We provide hypotheses for the photoproduction of other secosteroids and of kynuric metabolites of melatonin, based on the known photobiology of ∆5,7 sterols and of the indole ring, respectively. We also offer possible mechanisms of actions for these unique molecules and summarise differences and similarities of melatoninergic and secosteroidogenic pathways in diverse organisms including insects.
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Affiliation(s)
- Tae-Kang Kim
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Radomir M Slominski
- Department of Genetics, Genomics, Bioinformatics and Informatics Institute, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
| | - Elzbieta Pyza
- Department of Cell Biology and Imaging, Institute of Zoology and Biomedical Research, Jagiellonian University, Gronostajowa 9, Kraków, 30-387, Poland
| | - Konrad Kleszczynski
- Department of Dermatology, Münster, Von-Esmarch-Str. 58, Münster, 48161, Germany
| | - Robert C Tuckey
- School of Molecular Sciences, The University of Western Australia, Perth, WA, 6009, Australia
| | - Russel J Reiter
- Department of Cell Systems and Anatomy, UT Health, Long School of Medicine, San Antonio, TX, 78229, USA
| | | | - Andrzej T Slominski
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
- Comprehensive Cancer Center, Cancer Chemoprevention Program, University of Alabama at Birmingham, Birmingham, AL, 35294, USA
- VA Medical Center, Birmingham, AL, 35294, USA
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3
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Slominski RM, Chen JY, Raman C, Slominski AT. Photo-neuro-immuno-endocrinology: How the ultraviolet radiation regulates the body, brain, and immune system. Proc Natl Acad Sci U S A 2024; 121:e2308374121. [PMID: 38489380 PMCID: PMC10998607 DOI: 10.1073/pnas.2308374121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/17/2024] Open
Abstract
Ultraviolet radiation (UVR) is primarily recognized for its detrimental effects such as cancerogenesis, skin aging, eye damage, and autoimmune disorders. With exception of ultraviolet B (UVB) requirement in the production of vitamin D3, the positive role of UVR in modulation of homeostasis is underappreciated. Skin exposure to UVR triggers local responses secondary to the induction of chemical, hormonal, immune, and neural signals that are defined by the chromophores and extent of UVR penetration into skin compartments. These responses are not random and are coordinated by the cutaneous neuro-immuno-endocrine system, which counteracts the action of external stressors and accommodates local homeostasis to the changing environment. The UVR induces electrical, chemical, and biological signals to be sent to the brain, endocrine and immune systems, as well as other central organs, which in concert regulate body homeostasis. To achieve its central homeostatic goal, the UVR-induced signals are precisely computed locally with transmission through nerves or humoral signals release into the circulation to activate and/or modulate coordinating central centers or organs. Such modulatory effects will be dependent on UVA and UVB wavelengths. This leads to immunosuppression, the activation of brain and endocrine coordinating centers, and the modification of different organ functions. Therefore, it is imperative to understand the underlying mechanisms of UVR electromagnetic energy penetration deep into the body, with its impact on the brain and internal organs. Photo-neuro-immuno-endocrinology can offer novel therapeutic approaches in addiction and mood disorders; autoimmune, neurodegenerative, and chronic pain-generating disorders; or pathologies involving endocrine, cardiovascular, gastrointestinal, or reproductive systems.
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Affiliation(s)
- Radomir M. Slominski
- Departments of Genetics, the University of Alabama at Birmingham, Birmingham, AL35294
| | - Jake Y. Chen
- Department of Biomedical Informatics and Data Science, the University of Alabama at Birmingham, Birmingham, AL35294
- Comprehensive Cancer Center, Cancer Chemoprevention Program, University of Alabama at Birmingham, Birmingham, AL35294
| | - Chander Raman
- Department of Dermatology, the University of Alabama at Birmingham, Birmingham, AL35294
| | - Andrzej T. Slominski
- Comprehensive Cancer Center, Cancer Chemoprevention Program, University of Alabama at Birmingham, Birmingham, AL35294
- Department of Dermatology, the University of Alabama at Birmingham, Birmingham, AL35294
- Veteran Administration Medical Center, Birmingham, AL35294
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Ding M, Zhen Z, Ju M, Quzong S, Zeng X, Guo X, Li R, Xu M, Xu J, Li H, Zhang W. Metabolomic profiling between vitiligo patients and healthy subjects in plateau exhibited significant differences with those in plain. Clin Immunol 2023; 255:109764. [PMID: 37683903 DOI: 10.1016/j.clim.2023.109764] [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: 05/13/2023] [Revised: 08/22/2023] [Accepted: 09/03/2023] [Indexed: 09/10/2023]
Abstract
Vitiligo is the most common disorder of depigmentation, which is caused by multiple factors like metabolic abnormality, oxidative stress and the disorders of immune. In recent years, several studies have used untargeted metabolomics to analyze differential metabolites in patients with vitiligo, however, the subjects in these studies were all in plain area. In our study, multivariate analysis indicated a distinct separation between the healthy subjects from plateau and plain areas in electrospray positive and negative ions modes, respectively. Similarly, a distinct separation between vitiligo patients and healthy controls from plateau and plain areas was detected in the two ions modes. Among the identified metabolites, the serum levels of sphingosine 1-phosphate (S1P) were markedly higher in vitiligo patients compare to healthy subjects in plain and markedly higher in healthy subjects in plateau compare to those in plain. There are significant differences in serum metabolome between vitiligo patients and healthy subjects in both plateau and plain areas, as well as in healthy subjects from plateau and plain areas. S1P metabolism alteration may be involved in the pathogenesis of vitiligo.
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Affiliation(s)
- Meilin Ding
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Zha Zhen
- Department of Dermatology and Venereology, People's Hospital of Tibet Autonomous Region, Xizang 850010, China
| | - Mei Ju
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Suolang Quzong
- Department of Dermatology and Venereology, People's Hospital of Tibet Autonomous Region, Xizang 850010, China
| | - Xuesi Zeng
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Xiaoxia Guo
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Rui Li
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Mingming Xu
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China
| | - Jingjing Xu
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China; School of Basic Medicine and Clinical Pharmacy, China Pharmaceutical University, Nanjing 210042, China
| | - Hongyang Li
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China.
| | - Wei Zhang
- Institute of Dermatology, Chinese Academy of Medical Sciences and Peking Union Medical College, Nanjing 210042, China.
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5
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Serotonin (5-HT) 2A Receptor Involvement in Melanin Synthesis and Transfer via Activating the PKA/CREB Signaling Pathway. Int J Mol Sci 2022; 23:ijms23116111. [PMID: 35682806 PMCID: PMC9245606 DOI: 10.3390/ijms23116111] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 04/14/2022] [Accepted: 04/18/2022] [Indexed: 11/17/2022] Open
Abstract
The 5-HT2A serotonin receptor (HTR2A) has been reported to be involved in the serotonin- or serotonin receptor 2A agonist-induced melanogenesis in human melanoma cells. However, the molecular mechanisms underlying HTR2A in regulating melanogenesis remain poorly understood. In this research, cultured mouse melanoma cell line B16F10, human skin, and zebrafish embryos were used to elucidate the downstream signaling of HTR2A in regulating melanogenesis and to verify the potential application of HTR2A in the treatment of pigment-associated cutaneous diseases. We demonstrated that HTR2A antagonists (AT1015 and ketanserin) attenuated the melanogenesis induction of serotonin in both mouse melanoma cells and zebrafish embryos. The agonists of HTR2A (DOI and TCB-2) increased melanin synthesis and transfer in B16F10 cells, human skin tissue, and zebrafish embryos. Furthermore, the HTR2A agonists increased the expression of proteins related to melanosome organization and melanocyte dendrites to facilitate the melanocyte migration and melanosome transport. HTR2A antagonists and genetic knockout of zebrafish htr2aa (the homologue of mammalian HTR2A gene) were also used to clarify that HTR2A mediates serotonin and DOI in regulating melanogenesis. Finally, through small scale screening of the candidate downstream pathway, we demonstrated that HTR2A mediates the melanogenesis induction of its ligands by activating the PKA/CREB signaling pathway. In this research, we further confirmed that HTR2A is a crucial protein to mediate melanocyte function. Meanwhile, this research supports that HTR2A could be designed as a drug target for the development of chemicals to treat cutaneous diseases with melanocytes or melanogenesis abnormality.
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Sevilla A, Chéret J, Slominski RM, Slominski AT, Paus R. Revisiting the role of melatonin in human melanocyte physiology: A skin context perspective. J Pineal Res 2022; 72:e12790. [PMID: 35133682 PMCID: PMC8930624 DOI: 10.1111/jpi.12790] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Revised: 01/24/2022] [Accepted: 02/02/2022] [Indexed: 11/30/2022]
Abstract
The evolutionarily ancient methoxyindoleamine, melatonin, has long perplexed investigators by its versatility of functions and mechanisms of action, which include the regulation of vertebrate pigmentation. Although first discovered through its potent skin-lightening effects in amphibians, melatonin's role in human skin and hair follicle pigmentation and its impact on melanocyte physiology remain unclear. Synthesizing our limited current understanding of this role, we specifically examine its impact on melanogenesis, oxidative biology, mitochondrial function, melanocyte senescence, and pigmentation-related clock gene activity, with emphasis on human skin, yet without ignoring instructive pointers from nonhuman species. Given the strict dependence of melanocyte functions on the epithelial microenvironment, we underscore that melanocyte responses to melatonin are best interrogated in a physiological tissue context. Current evidence suggests that melatonin and some of its metabolites inhibit both, melanogenesis (via reducing tyrosinase activity) and melanocyte proliferation by stimulating melatonin membrane receptors (MT1, MT2). We discuss whether putative melanogenesis-inhibitory effects of melatonin may occur via activation of Nrf2-mediated PI3K/AKT signaling, estrogen receptor-mediated and/or melanocortin-1 receptor- and cAMP-dependent signaling, and/or via melatonin-regulated changes in peripheral clock genes that regulate human melanogenesis, namely Bmal1 and Per1. Melatonin and its metabolites also accumulate in melanocytes where they exert net cyto- and senescence-protective as well as antioxidative effects by operating as free radical scavengers, stimulating the synthesis and activity of ROS scavenging enzymes and other antioxidants, promoting DNA repair, and enhancing mitochondrial function. We argue that it is clinically and biologically important to definitively clarify whether melanocyte cell culture-based observations translate into melatonin-induced pigmentary changes in a physiological tissue context, that is, in human epidermis and hair follicles ex vivo, and are confirmed by clinical trial results. After defining major open questions in this field, we close by suggesting how to begin answering them in clinically relevant, currently available preclinical in situ research models.
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Affiliation(s)
- Alec Sevilla
- Dr. Phillip Frost Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Jérémy Chéret
- Dr. Phillip Frost Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA
| | - Radomir M. Slominski
- Graduate Biomedical Sciences Program, University of Alabama at Birmingham, Birmingham, AL 35294, USA
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Andrzej T. Slominski
- Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
- Pathology Laboratory Service, Veteran Administration Medical Center at Birmingham, Birmingham, AL35294, USA
- Corresponding authors: Ralf Paus, MD, DSc: ; Andrzej T. Slominski, MD, PhD:
| | - Ralf Paus
- Dr. Phillip Frost Department of Dermatology and Cutaneous Surgery, University of Miami Miller School of Medicine, Miami, Florida, USA
- Monasterium Laboratory, Münster, Germany
- CUTANEON – Skin & Hair Innovations, Hamburg, Germany
- Corresponding authors: Ralf Paus, MD, DSc: ; Andrzej T. Slominski, MD, PhD:
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7
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de França E, dos Santos RVT, Baptista LC, Da Silva MAR, Fukushima AR, Hirota VB, Martins RA, Caperuto EC. Potential Role of Chronic Physical Exercise as a Treatment in the Development of Vitiligo. Front Physiol 2022; 13:843784. [PMID: 35360245 PMCID: PMC8960951 DOI: 10.3389/fphys.2022.843784] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Accepted: 02/08/2022] [Indexed: 02/04/2023] Open
Abstract
Vitiligo is an autoimmune disease characterized by progressive skin depigmentation and the appearance of white patches throughout the body caused by significant apoptosis of epidermal melanocytes. Despite not causing any physical pain, vitiligo can originate several psychosocial disorders, drastically reducing patients' quality of life. Emerging evidence has shown that vitiligo is associated with several genetic polymorphisms related to auto-reactivity from the immune system to melanocytes. Melanocytes from vitiligo patients suffer from excess reactive oxygen species (ROS) produced by defective mitochondria besides a poor endogenous antioxidant system (EAS). This redox imbalance results in dramatic melanocyte oxidative stress (OS), causing significant damage in proteins, lipid membranes, and DNA. The damaged melanocytes secret damage-associated molecular pattern (DAMPs), inducing and increasing inflammatory gene expression response that ultimately leads to melanocytes apoptosis. Vitiligo severity has been also associated with increasing the prevalence and incidence of metabolic syndrome (MetS) or associated disorders such as insulin resistance and hypercholesterolemia. Thus, suggesting that in genetically predisposed individuals, the environmental context that triggers MetS (i.e., sedentary lifestyle) may also be an important trigger for the development and severity of vitiligo disease. This paper will discuss the relationship between the immune system and epidermal melanocytes and their interplay with the redox system. Based on state-of-the-art evidence from the vitiligo research, physical exercise (PE) immunology, and redox system literature, we will also propose chronic PE as a potential therapeutic strategy to treat and prevent vitiligo disease progression. We will present evidence that chronic PE can change the balance of inflammatory to an anti-inflammatory state, improve both EAS and the mitochondrial structure and function (resulting in the decrease of OS). Finally, we will highlight clinically relevant markers that can be analyzed in a new research avenue to test the potential applicability of chronic PE in vitiligo disease.
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Affiliation(s)
- Elias de França
- Human Movement Laboratory, São Judas University, São Paulo, Brazil
- Departamento de Biociências, Universidade Federal de São Paulo, São Paulo, Brazil
| | | | - Liliana C. Baptista
- Faculty of Sport, Research Centre in Physical Activity, Health and Leisure, University of Porto, Porto, Portugal
- Center for Exercise Medicine, University of Alabama at Birmingham, Birmingham, AL United States
- Targeted Exercise, Microbiome and Aging Laboratory, University of Alabama, Birmingham, AL United States
| | - Marco A. R. Da Silva
- Faculty of Sport Sciences and Physical Education, University of Coimbra, Coimbra, Portugal
- Department of Physical Education, Universidade da Amazônia, Belém, Brazil
| | - André R. Fukushima
- Centro Universitário das Américas – FAM, São Paulo, Brazil
- Faculdade de Ciências da Saúde – IGESP – FASIG, São Paulo, Brazil
| | | | - Raul A. Martins
- Faculty of Sport Sciences and Physical Education, University of Coimbra, Coimbra, Portugal
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Sun MC, Xu XL, Du Y, Lou XF, Wang W, You YC, Liu D, Jin FY, Qi J, Zhu MX, Zhu LW, Wang J, Du YZ. Biomimetic Melanosomes Promote Orientation-Selective Delivery and Melanocyte Pigmentation in the H 2O 2-Induced Vitiligo Mouse Model. ACS NANO 2021; 15:17361-17374. [PMID: 34662120 DOI: 10.1021/acsnano.1c05321] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Extremely limited drug retention and depigmentation represent the greatest barriers against vitiligo treatment advancement. Here, inspired by biological melanosomes, the primary melanin transporter, we developed biomimetic melanosomes to combat reactive oxygen species (ROS)-mediated melanocyte damage and depigmentation. Briefly, methylprednisolone (MPS) and melanin-mimicking polydopamine (PDA) were encapsulated inside lysine-proline-valine (KPV)-modified deformable liposomes (KPV-Lipos). Owing to their phospholipid bilayer flexibility and the specific affinity for melanocortin 1 receptor (MC1R), KPV-Lipos exhibited 1.43-fold greater skin deposition than traditional liposomes. The binding of KPV and its receptor also contributed to activating the cAMP-tyrosinase (TYR) signaling pathway, improving the endogenous melanin content. In addition, PDA mimicked melanosomes as it effectively increased the exogenous melanin content and scavenged ROS. Meanwhile, MPS inhibited inflammatory cytokine secretion, limiting the depigmented area. Ultimately, the biomimetic melanosomes affected the skin color of mice with H2O2-induced vitiligo. These melanosomes show potential as a universal platform for the self-supply of melanin by self-driven melanin synthesis with exogenous supplementation. Furthermore, this study offers ideas for the production of artificial packed melanosome substitutes for melanocyte-related diseases.
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Affiliation(s)
- Ming-Chen Sun
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xiao-Ling Xu
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yan Du
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Xue-Fang Lou
- School of Medicine, Zhejiang University City College, Hangzhou 310015, China
| | - Wei Wang
- Department of Pharmaceutics, Hangzhou Third Hospital, Hangzhou 310009, China
| | - Yu-Chan You
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Di Liu
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Fei-Yang Jin
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jing Qi
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Min-Xia Zhu
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Lu-Wen Zhu
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Jun Wang
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
| | - Yong-Zhong Du
- Institute of Pharmaceutics, College of Pharmaceutical Sciences, Zhejiang University, Hangzhou 310058, China
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9
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Dubreuil MM, Morgens DW, Okumoto K, Honsho M, Contrepois K, Lee-McMullen B, Traber GM, Sood RS, Dixon SJ, Snyder MP, Fujiki Y, Bassik MC. Systematic Identification of Regulators of Oxidative Stress Reveals Non-canonical Roles for Peroxisomal Import and the Pentose Phosphate Pathway. Cell Rep 2021; 30:1417-1433.e7. [PMID: 32023459 DOI: 10.1016/j.celrep.2020.01.013] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Revised: 10/07/2019] [Accepted: 01/02/2020] [Indexed: 12/13/2022] Open
Abstract
Reactive oxygen species (ROS) play critical roles in metabolism and disease, yet a comprehensive analysis of the cellular response to oxidative stress is lacking. To systematically identify regulators of oxidative stress, we conducted genome-wide Cas9/CRISPR and shRNA screens. This revealed a detailed picture of diverse pathways that control oxidative stress response, ranging from the TCA cycle and DNA repair machineries to iron transport, trafficking, and metabolism. Paradoxically, disrupting the pentose phosphate pathway (PPP) at the level of phosphogluconate dehydrogenase (PGD) protects cells against ROS. This dramatically alters metabolites in the PPP, consistent with rewiring of upper glycolysis to promote antioxidant production. In addition, disruption of peroxisomal import unexpectedly increases resistance to oxidative stress by altering the localization of catalase. Together, these studies provide insights into the roles of peroxisomal matrix import and the PPP in redox biology and represent a rich resource for understanding the cellular response to oxidative stress.
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Affiliation(s)
- Michael M Dubreuil
- Program in Cancer Biology, Stanford University, Stanford, CA 94305-5120, USA; Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA
| | - David W Morgens
- Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA
| | - Kanji Okumoto
- Department of Biology, Faculty of Sciences, Graduate School of Systems Life Sciences, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan; Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Masanori Honsho
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan
| | - Kévin Contrepois
- Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA
| | | | | | - Ria S Sood
- Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA
| | - Scott J Dixon
- Program in Cancer Biology, Stanford University, Stanford, CA 94305-5120, USA; Department of Biology, Stanford University, 327 Campus Drive, Stanford, CA 94305, USA; Chemistry, Engineering, and Medicine for Human Health (ChEM-H), Stanford University, Stanford, CA 94305-5120, USA
| | - Michael P Snyder
- Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA
| | - Yukio Fujiki
- Division of Organelle Homeostasis, Medical Institute of Bioregulation, Kyushu University, 3-1-1 Maidashi, Higashi-ku, Fukuoka 812-8582, Japan.
| | - Michael C Bassik
- Program in Cancer Biology, Stanford University, Stanford, CA 94305-5120, USA; Department of Genetics, Stanford University, Stanford, CA 94305-5120, USA; Chemistry, Engineering, and Medicine for Human Health (ChEM-H), Stanford University, Stanford, CA 94305-5120, USA.
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10
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Worrede A, Douglass SM, Weeraratna AT. The dark side of daylight: photoaging and the tumor microenvironment in melanoma progression. J Clin Invest 2021; 131:143763. [PMID: 33720046 DOI: 10.1172/jci143763] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Continued thinning of the atmospheric ozone, which protects the earth from damaging ultraviolet radiation (UVR), will result in elevated levels of UVR reaching the earth's surface, leading to a drastic increase in the incidence of skin cancer. In addition to promoting carcinogenesis in skin cells, UVR is a potent extrinsic driver of age-related changes in the skin known as "photoaging." We are in the preliminary stages of understanding of the role of intrinsic aging in melanoma, and the tumor-permissive effects of photoaging on the skin microenvironment remain largely unexplored. In this Review, we provide an overview of the impact of UVR on the skin microenvironment, addressing changes that converge or diverge with those observed in intrinsic aging. Intrinsic and extrinsic aging promote phenotypic changes to skin cell populations that alter fundamental processes such as melanogenesis, extracellular matrix deposition, inflammation, and immune response. Given the relevance of these processes in cancer, we discuss how photoaging might render the skin microenvironment permissive to melanoma progression.
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Affiliation(s)
- Asurayya Worrede
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Stephen M Douglass
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA
| | - Ashani T Weeraratna
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland, USA.,Sidney Kimmel Cancer Center, Johns Hopkins School of Medicine, Baltimore, Maryland, USA
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11
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A New Insight into the Potential Role of Tryptophan-Derived AhR Ligands in Skin Physiological and Pathological Processes. Int J Mol Sci 2021; 22:ijms22031104. [PMID: 33499346 PMCID: PMC7865493 DOI: 10.3390/ijms22031104] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 01/15/2021] [Accepted: 01/19/2021] [Indexed: 12/31/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) plays a crucial role in environmental responses and xenobiotic metabolism, as it controls the transcription profiles of several genes in a ligand-specific and cell-type-specific manner. Various barrier tissues, including skin, display the expression of AhR. Recent studies revealed multiple roles of AhR in skin physiology and disease, including melanogenesis, inflammation and cancer. Tryptophan metabolites are distinguished among the groups of natural and synthetic AhR ligands, and these include kynurenine, kynurenic acid and 6-formylindolo[3,2-b]carbazole (FICZ). Tryptophan derivatives can affect and regulate a variety of signaling pathways. Thus, the interest in how these substances influence physiological and pathological processes in the skin is expanding rapidly. The widespread presence of these substances and potential continuous exposure of the skin to their biological effects indicate the important role of AhR and its ligands in the prevention, pathogenesis and progression of skin diseases. In this review, we summarize the current knowledge of AhR in skin physiology. Moreover, we discuss the role of AhR in skin pathological processes, including inflammatory skin diseases, pigmentation disorders and cancer. Finally, the impact of FICZ, kynurenic acid, and kynurenine on physiological and pathological processes in the skin is considered. However, the mechanisms of how AhR regulates skin function require further investigation.
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12
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Cui X, Su G, Zhang L, Yi S, Cao Q, Zhou C, Kijlstra A, Yang P. Integrated omics analysis of sweat reveals an aberrant amino acid metabolism pathway in Vogt-Koyanagi-Harada disease. Clin Exp Immunol 2020; 200:250-259. [PMID: 32222072 PMCID: PMC7232003 DOI: 10.1111/cei.13435] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/19/2020] [Accepted: 03/19/2020] [Indexed: 12/27/2022] Open
Abstract
Vogt-Koyanagi-Harada (VKH) disease is an autoimmune disease leading to visual impairment. Its pathogenic mechanisms remain poorly understood. Our purpose was to investigate the distinctive protein and metabolic profiles of sweat in patients with VKH disease. In the present study, proteomics and metabolomics analysis was performed on 60 sweat samples (30 VKH patients and 30 normal controls) using liquid chromatography tandem mass spectrometry. Parallel reaction monitoring (PRM) analysis was used to validate the results of our omics analysis. In total, we were able to detect 716 proteins and 175 metabolites. Among them, 116 proteins (99 decreased and 17 increased) were observed to be significantly different in VKH patients when compared to controls. Twenty-one differentially expressed metabolites were identified in VKH patients, of which 18 included choline, L-tryptophan, betaine and L-serine were reduced, while the rest were increased. Our multi-omics strategy reveals an important role for the amino acid metabolic pathway in the pathogenesis of VKH disease. Significant differences in proteins and metabolites were identified in the sweat of VKH patients and, to some extent, an aberrant amino acid metabolism pathway may be a pathogenic factor in the pathogenesis of VKH disease.
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Affiliation(s)
- X. Cui
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - G. Su
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - L. Zhang
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - S. Yi
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - Q. Cao
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - C. Zhou
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
| | - A. Kijlstra
- University Eye Clinic MaastrichtMaastrichtthe Netherlands
| | - P. Yang
- The First Affiliated Hospital of Chongqing Medical UniversityChongqing Key Laboratory of Ophthalmology and Chongqing Eye InstituteChongqingChina
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Fang W, Tang L, Wang G, Lin J, Liao W, Pan W, Xu J. Molecular Hydrogen Protects Human Melanocytes from Oxidative Stress by Activating Nrf2 Signaling. J Invest Dermatol 2020; 140:2230-2241.e9. [PMID: 32234461 DOI: 10.1016/j.jid.2019.03.1165] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 02/28/2019] [Accepted: 03/06/2019] [Indexed: 01/03/2023]
Abstract
Oxidative stress is proven to be critical for the initiation and progression of vitiligo. Molecular hydrogen (H2) possesses potent antioxidant activity and has been shown to protect against various oxidative stress-related diseases. In this study, we first investigated the effects and mechanisms of H2 in human melanocytes damaged by hydrogen peroxide. We initially found that H2 reduced intracellular ROS accumulation and malondialdehyde levels in both vitiligo specimens and hydrogen peroxide-treated melanocytes in vitro in a concentration- and time-dependent manner, concomitant with the enhancement of antioxidant enzyme activity. Correspondingly, H2 reversed hydrogen peroxide-induced apoptosis and dysfunction in both normal and vitiligo melanocytes. H2 protected mitochondrial morphology and function in melanocytes under stress and promoted the activation of Nrf2 signaling, whereas Nrf2 deficiency abolished the protective effect of H2 against hydrogen peroxide-induced oxidative damage. Furthermore, H2 positively modulated β-catenin in hydrogen peroxide-treated melanocytes, and the β-catenin pathway was implicated in H2-induced Nrf2 activation. Collectively, our results indicate that H2 could be a promising therapeutic agent for vitiligo treatment via attenuating oxidative damage, and its beneficial effect in human melanocytes might involve Wnt/β-catenin-mediated activation of Nrf2 signaling.
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Affiliation(s)
- Wei Fang
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai, China; The Shanghai Institute of Dermatology, Shanghai, China; Shanghai Key Laboratory of Molecular Medical Mycology, Department of Dermatology, Changzheng Hospital, Shanghai, China
| | - Luyan Tang
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai, China; The Shanghai Institute of Dermatology, Shanghai, China
| | - Guizhen Wang
- Emergency room, Shanghai Tenth People's Hospital of Tongji University, Shanghai, China
| | - Jinran Lin
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai, China
| | - Wanqing Liao
- Shanghai Key Laboratory of Molecular Medical Mycology, Department of Dermatology, Changzheng Hospital, Shanghai, China
| | - Weihua Pan
- Shanghai Key Laboratory of Molecular Medical Mycology, Department of Dermatology, Changzheng Hospital, Shanghai, China
| | - Jinhua Xu
- Department of Dermatology, Huashan Hospital, Fudan University, Shanghai, China; The Shanghai Institute of Dermatology, Shanghai, China.
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Slominski AT, Kim TK, Kleszczyński K, Semak I, Janjetovic Z, Sweatman T, Skobowiat C, Steketee JD, Lin Z, Postlethwaite A, Li W, Reiter RJ, Tobin DJ. Characterization of serotonin and N-acetylserotonin systems in the human epidermis and skin cells. J Pineal Res 2020; 68:e12626. [PMID: 31770455 PMCID: PMC7007327 DOI: 10.1111/jpi.12626] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Revised: 11/15/2019] [Accepted: 11/16/2019] [Indexed: 12/14/2022]
Abstract
Tryptophan hydroxylase (TPH) activity was detected in cultured epidermal melanocytes and dermal fibroblasts with respective Km of 5.08 and 2.83 mM and Vmax of 80.5 and 108.0 µmol/min. Low but detectable TPH activity was also seen in cultured epidermal keratinocytes. Serotonin and/or its metabolite and precursor to melatonin, N-acetylserotonin (NAS), were identified by LC/MS in human epidermis and serum. Endogenous epidermal levels were 113.18 ± 13.34 and 43.41 ± 12.45 ng/mg protein for serotonin (n = 8/8) and NAS (n = 10/13), respectively. Their production was independent of race, gender, and age. NAS was also detected in human serum (n = 13/13) at a concentration 2.44 ± 0.45 ng/mL, while corresponding serotonin levels were 295.33 ± 17.17 ng/mL (n = 13/13). While there were no differences in serum serotonin levels, serum NAS levels were slightly higher in females. Immunocytochemistry studies showed localization of serotonin to epidermal and follicular keratinocytes, eccrine glands, mast cells, and dermal fibrocytes. Endogenous production of serotonin in cultured melanocytes, keratinocytes, and dermal fibroblasts was modulated by UVB. In conclusion, serotonin and NAS are produced endogenously in the epidermal, dermal, and adnexal compartments of human skin and in cultured skin cells. NAS is also detectable in human serum. Both serotonin and NAS inhibited melanogenesis in human melanotic melanoma at concentrations of 10-4 -10-3 M. They also inhibited growth of melanocytes. Melanoma cells were resistant to NAS inhibition, while serotonin inhibited cell growth only at 10-3 M. In summary, we characterized a serotonin-NAS system in human skin that is a part of local neuroendocrine system regulating skin homeostasis.
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Affiliation(s)
- Andrzej T. Slominski
- Department of Dermatology, University of Alabama at Birmingham, and Birmingham, AL, USA
- Department of Dermatology,VA Medical Center; Birmingham, AL, USA
| | - Tae-Kang Kim
- Department of Dermatology, University of Alabama at Birmingham, and Birmingham, AL, USA
| | - Konrad Kleszczyński
- Department of Dermatology, University of Münster, Von-Esmarch-Str. 58, 48149 Münster, Germany
| | - Igor Semak
- Department of Biochemistry, Belarusian State University, Minsk, Belarus
| | - Zorica Janjetovic
- Department of Dermatology, University of Alabama at Birmingham, and Birmingham, AL, USA
| | | | - Cezary Skobowiat
- Department of Pharmacodynamics and Molecular Pharmacology, Faculty of Pharmacy, Collegium Medicum, Nicolaus Copernicus University, Bydgoszcz, Poland
| | | | - Zongtao Lin
- Departments of Pharmaceutical Sciences, Memphis, TN 38163, USA
| | - Arnold Postlethwaite
- Departments of Medicine, Division of Rheumatology, University of Tennessee Health Science Center, Memphis, TN 38163, USA
- Departments of VA Medical Center, Memphis, TN 38163, USA
| | - Wei Li
- Departments of Pharmaceutical Sciences, Memphis, TN 38163, USA
| | - Russel J. Reiter
- Department of Cellular and Structural Biology, UT Health Science Center, San Antonio, TX, USA
| | - Desmond J. Tobin
- The Charles Institute of Dermatology, University College Dublin, Dublin, Ireland
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15
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Vallerand IA, Lewinson RT, Parsons LM, Hardin J, Haber RM, Lowerison MW, Barnabe C, Patten SB. Vitiligo and major depressive disorder: A bidirectional population-based cohort study. J Am Acad Dermatol 2018; 80:1371-1379. [PMID: 30528503 DOI: 10.1016/j.jaad.2018.11.047] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2018] [Revised: 10/19/2018] [Accepted: 11/21/2018] [Indexed: 12/30/2022]
Abstract
BACKGROUND Vitiligo patients often report their mental health has an effect on their skin. However, it is unknown as to whether a common mental disorder, such as major depressive disorder (MDD), can also precipitate the onset of vitiligo. OBJECTIVE Evaluate a bidirectional relationship between MDD and vitiligo using The Health Improvement Network database. METHODS Incident MDD and referent cohorts were followed until the development of vitiligo. Also, incident vitiligo and referent cohorts were followed until the development of MDD. Cox proportional hazards models were used, and numerous covariates were adjusted for. RESULTS In adjusted models, MDD patients (n = 405,397) were at a 64% increased risk for vitiligo (hazard ratio 1.64, 95% confidence interval [CI] 1.43-1.87, P < .0001) compared with the referent cohort (n = 5,739,048). This risk was decreased in patients using antidepressants. Compared with the referent cohort (n = 6,137,696), patients with vitiligo (n = 7104) that were <30 years of age at diagnosis had a higher risk of developing MDD than patients ≥30 years of age (hazard ratio 1.31, 95% CI 1.14-1.50, P < .0001 vs 1.22, 95% CI 1.08-1.37, P = .001, respectively). LIMITATIONS This study did not evaluate the severity of MDD or vitiligo on outcome development. CONCLUSION These results highlight the burden of depression in patients with vitiligo and support the possible existence of pathophysiological connections between these 2 conditions.
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Affiliation(s)
- Isabelle A Vallerand
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada.
| | - Ryan T Lewinson
- Division of Dermatology, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Laurie M Parsons
- Division of Dermatology, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Jori Hardin
- Division of Dermatology, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Richard M Haber
- Division of Dermatology, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Mark W Lowerison
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada; Clinical Research Unit, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Cheryl Barnabe
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada; Department of Medicine, Cumming School of Medicine, University of Calgary, Calgary, Canada
| | - Scott B Patten
- Department of Community Health Sciences, Cumming School of Medicine, University of Calgary, Calgary, Canada; Department of Psychiatry, Cumming School of Medicine, University of Calgary, Calgary, Canada
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16
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Ma J, Li S, Zhu L, Guo S, Yi X, Cui T, He Y, Chang Y, Liu B, Li C, Jian Z. Baicalein protects human vitiligo melanocytes from oxidative stress through activation of NF-E2-related factor2 (Nrf2) signaling pathway. Free Radic Biol Med 2018; 129:492-503. [PMID: 30342186 DOI: 10.1016/j.freeradbiomed.2018.10.421] [Citation(s) in RCA: 64] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 08/26/2018] [Accepted: 10/09/2018] [Indexed: 12/30/2022]
Abstract
Vitiligo is a complex disorder characterized by patchy loss of skin pigmentation due to abnormal melanocyte function. Overwhelming evidences have suggested that oxidative stress plays a major role in the loss of melanocytes thereby mediating the onset and progression of vitiligo. The nuclear factor erythroid 2-like factor 2 (Nrf2) is a master regulator of cellular redox homeostasis and the activation of Nrf2 signaling pathway is impaired in the vitiligo melanocytes. Baicalein, as flavonoid extracted from the Scutellaria baicalensis, has been proved to possess the ability to activate Nrf2 signaling pathway in other cell types and mouse model. Our previous data found that baicalein exerts a cytoprotective role in H2O2-induced apoptosis in human melanocytes cell line (PIG1). Based on these founding, we hypothesized that baicalein activates Nrf2 signaling pathway, alleviates H2O2-induced mitochondrial dysfunction and cellular damage, thereby protecting human vitiligo melanocytes from oxidative stress. In the present study, we found that baicalein effectively inhibited H2O2-induced cytotoxicity and apoptosis in human vitiligo melanocytes (PIG3V). Further results demonstrated that baicalein promoted Nrf2 nucleus translocation as well as up-regulated the expression of Nrf2 and its target gene, heme oxygenase-1 (HO-1). Moreover, the protective effects of baicalein against H2O2-induced cellular damage and apoptosis as well as mitochondrial dysfunction were abolished by Nrf2 knockdown. Additionally, we observed that Nrf2 knockdown suppressed proliferation and increased the sensitivity of PIG3V cells to H2O2 treatment. Finally, we explored the mechanism of baicalein associated with Nrf2 activation and found that the phosphorylation of Nrf2 as well as ERK1/2and PI3K/AKT signaling were not involved in the baicalein-induced activation of Nrf2. Taken together, these data clearly suggest that baicalein enhances cellular antioxidant defense capacity of human vitiligo melanocytes through the activation of the Nrf2 signaling pathway, providing beneficial evidence for the application of baicalein in the vitiligo treatment.
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Affiliation(s)
- Jingjing Ma
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Shuli Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Longfei Zhu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Sen Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Tingting Cui
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Yuanmin He
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Yuqian Chang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China
| | - Bangmin Liu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China.
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China.
| | - Zhe Jian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, No. 127 Changlexi Road, Xi'an 710032, Shaanxi, China.
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17
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Melatonin: A Cutaneous Perspective on its Production, Metabolism, and Functions. J Invest Dermatol 2018; 138:490-499. [PMID: 29428440 DOI: 10.1016/j.jid.2017.10.025] [Citation(s) in RCA: 180] [Impact Index Per Article: 30.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Revised: 10/05/2017] [Accepted: 10/17/2017] [Indexed: 02/07/2023]
Abstract
Melatonin, an evolutionarily ancient derivative of serotonin with hormonal properties, is the main neuroendocrine secretory product of the pineal gland. Although melatonin is best known to regulate circadian rhythmicity and lower vertebrate skin pigmentation, the full spectrum of functional activities of this free radical-scavenging molecule, which also induces/promotes complex antioxidative and DNA repair systems, includes immunomodulatory, thermoregulatory, and antitumor properties. Because this plethora of functional melatonin properties still awaits to be fully appreciated by dermatologists, the current review synthesizes the main features that render melatonin a promising candidate for the management of several dermatoses associated with substantial oxidative damage. We also review why melatonin promises to be useful in skin cancer prevention, skin photo- and radioprotection, and as an inducer of repair mechanisms that facilitate the recovery of human skin from environmental damage. The fact that human skin and hair follicles not only express functional melatonin receptors but also engage in substantial, extrapineal melatonin synthesis further encourages one to systematically explore how the skin's melatonin system can be therapeutically targeted in future clinical dermatology and enrolled for preventive medicine strategies.
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18
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Xie Z, Zhang M, Xiong W, Wan HY, Zhao XC, Xie T, Lei H, Lin ZC, Luo DS, Liang XL, Chen YH. Immunotolerant indoleamine-2,3-dioxygenase is increased in condyloma acuminata. Br J Dermatol 2017; 177:809-817. [PMID: 28132413 DOI: 10.1111/bjd.15356] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/22/2017] [Indexed: 01/06/2023]
Abstract
BACKGROUND The tryptophan-depleting enzyme indoleamine-2,3-dioxygenase (IDO) is critical for the regulation of immunotolerance and plays an important role in immune-associated skin diseases. OBJECTIVES To analyse the level of IDO in condyloma acuminata (CA) and its role in this condition. METHODS IDO expression was assessed in the skin and peripheral blood of healthy controls and patients with CA. To assess the role of skin IDO in immunity, the ability of isolated epidermal cells to metabolize tryptophan and the influence on polyclonal T-cell mitogen (PHA)-stimulated T-cell proliferation were explored. RESULTS IDO median fluorescence intensities in peripheral blood mononuclear cells from patients with CA were similar to those from healthy controls. Immunohistochemistry showed that IDO+ cells were rare in normal skin and the control skin of patients with CA, but were greatly accumulated in wart tissue. Most fluorescence signals of IDO+ cells did not overlap with those of CD1a+ Langerhans cells. Human papillomavirus (HPV) DNA probe in situ hybridization showed a large number of IDO+ cells in the HPV- site. Keratinocytes in the skin of healthy controls and the circumcised skin of patients with CA could minimally transform tryptophan into kynurenine, but IDO-competent epidermal cells from warts could transform tryptophan. In addition, these IDO-competent epidermal cells could inhibit PHA-stimulated T-cell proliferation. The addition of an IDO inhibitor, 1-methyl-d-tryptophan, restored the inhibited T-cell proliferation. CONCLUSIONS Abnormally localized high IDO expression might be involved in the formation of a local immunotolerant microenvironment.
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Affiliation(s)
- Z Xie
- Department of Dermatology, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - M Zhang
- Department of Gastroenterology, the Sixth Affiliated Hospital, Sun Yat-sen University, Guangzhou, China
| | - W Xiong
- Division of Urology and Transplantation, Department of Surgery, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - H Y Wan
- Department of Dermatology, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - X C Zhao
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China.,Nanfang Medical University, Guangzhou, China
| | - T Xie
- Department of Dermatology, Guangdong Provincial Hospital of Chinese Hospital, Guangzhou, China
| | - H Lei
- Department of Dermatology, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - Z C Lin
- Department of Dermatology, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - D S Luo
- Department of Dermatology, Sichuan Academy of Medical Science & Sichuan Provincial People's Hospital, Chengdu, China
| | - X L Liang
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
| | - Y H Chen
- Division of Nephrology, Guangdong General Hospital, Guangdong Academy of Medical Sciences, Guangzhou, China
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19
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He Y, Li S, Zhang W, Dai W, Cui T, Wang G, Gao T, Li C. Dysregulated autophagy increased melanocyte sensitivity to H 2O 2-induced oxidative stress in vitiligo. Sci Rep 2017; 7:42394. [PMID: 28186139 PMCID: PMC5301258 DOI: 10.1038/srep42394] [Citation(s) in RCA: 78] [Impact Index Per Article: 11.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 01/10/2017] [Indexed: 11/09/2022] Open
Abstract
In vitiligo, melanocytes are particularly vulnerable to oxidative stress owing to the pro-oxidant state generated during melanin synthesis and to the genetic antioxidant defects. Autophagy is a controlled self-digestion process which can protect cells against oxidative damage. However, the exact role of autophagy in vitiligo melanocytes in response to oxidative stress and the mechanism involved are still not clear. To determine the implications of autophagy for melanocyte survival in response to oxidative stress, we first detected the autophagic flux in normal melanocytes exposure to H2O2, and found that autophagy was significantly enhanced in normal melanocytes, for protecting cells against H2O2-induced oxidative damage. Nevertheless, vitiligo melanocytes exhibited dysregulated autophagy and hypersensitivity to H2O2-induced oxidative injury. In addition, we confirmed that the impairment of Nrf2-p62 pathway is responsible for the defects of autophagy in vitiligo melanocytes. Noteworthily, upregulation of the Nrf2-p62 pathway or p62 reduced H2O2-induced oxidative damage of vitiligo melanocytes. Therefore, our data demonstrated that dysregulated autophagy owing to the impairment of Nrf2-p62 pathway increase the sensitivity of vitiligo melanocytes to oxidative stress, thus promote the development of vitiligo. Upregulation of p62-dependent autophagy may be applied to vitiligo treatment in the future.
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Affiliation(s)
- Yuanmin He
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Shuli Li
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Weigang Zhang
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Wei Dai
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Tingting Cui
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Gang Wang
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Tianwen Gao
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Chunying Li
- Department of Dermatology, Xijing hospital, Fourth Military Medical University, Xi'an, Shaanxi, China
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20
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Castaño C, Vignoni M, Vicendo P, Oliveros E, Thomas AH. Degradation of tyrosine and tryptophan residues of peptides by type I photosensitized oxidation. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2016; 164:226-235. [DOI: 10.1016/j.jphotobiol.2016.09.024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Revised: 09/13/2016] [Accepted: 09/15/2016] [Indexed: 10/21/2022]
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21
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Song C, Peng W, Yin S, Zhao J, Fu B, Zhang J, Mao T, Wu H, Zhang Y. Melatonin improves age-induced fertility decline and attenuates ovarian mitochondrial oxidative stress in mice. Sci Rep 2016; 6:35165. [PMID: 27731402 PMCID: PMC5059725 DOI: 10.1038/srep35165] [Citation(s) in RCA: 96] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2016] [Accepted: 09/26/2016] [Indexed: 12/21/2022] Open
Abstract
Increasing evidence shows that melatonin protected against age-related mitochondrial oxidative damage. However, the protective effects of melatonin against ovarian aging has not been explored. Young Kunming females (aged 2–3 months) were fed with melatonin added to drinking water for 6 or 12 months (mo). We found that long-term (12 mo) melatonin treatment significantly reduced ovarian aging, as indicated by substantial increases in litter size, pool of follicles, and telomere length as well as oocyte quantity and quality. Melatonin treatment suppressed ovarian mitochondrial oxidative damage by decreasing mitochondrial reactive oxygen species (mROS) generation, inhibiting apoptosis, repressing collapse of mitochondrial membrane potential and preserving respiratory chain complex activities. Female mice fed with melatonin had enhanced mitochondrial antioxidant activities, thus reducing the risk of mitochondrial oxidative damage cause by free radicals. Notably, melatonin treatment enhanced SIRT3 activity but not the protein expression level, and increased the binding affinity of FoxO3a to the promoters of both superoxide dismutase 2 (SOD2) and catalase (CAT). In conclusion, melatonin exerted protection against aging-induced fertility decline and maintenance of mitochondrial redox balance.
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Affiliation(s)
- Chao Song
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Wei Peng
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Songna Yin
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Jiamin Zhao
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Beibei Fu
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Jingcheng Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Tingchao Mao
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Haibo Wu
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
| | - Yong Zhang
- College of Veterinary Medicine, Northwest A&F University, Yangling 712100, Shaanxi, China.,Key Laboratory of Animal Biotechnology, Ministry of Agriculture, Northwest A&F University, Yangling 712100, Shaanxi, China
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22
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RamaKrishnan AM, Sankaranarayanan K. Understanding autoimmunity: The ion channel perspective. Autoimmun Rev 2016; 15:585-620. [PMID: 26854401 DOI: 10.1016/j.autrev.2016.02.004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2016] [Accepted: 01/29/2016] [Indexed: 12/11/2022]
Abstract
Ion channels are integral membrane proteins that orchestrate the passage of ions across the cell membrane and thus regulate various key physiological processes of the living system. The stringently regulated expression and function of these channels hold a pivotal role in the development and execution of various cellular functions. Malfunction of these channels results in debilitating diseases collectively termed channelopathies. In this review, we highlight the role of these proteins in the immune system with special emphasis on the development of autoimmunity. The role of ion channels in various autoimmune diseases is also listed out. This comprehensive review summarizes the ion channels that could be used as molecular targets in the development of new therapeutics against autoimmune disorders.
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Affiliation(s)
| | - Kavitha Sankaranarayanan
- AU-KBC Research Centre, Madras Institute of Technology, Anna University, Chrompet, Chennai 600 044, India.
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23
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Oxidized tyrosinase: A possible antigenic stimulus for non-segmental vitiligo autoantibodies. J Dermatol Sci 2015; 79:203-13. [DOI: 10.1016/j.jdermsci.2015.06.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 12/07/2014] [Accepted: 06/18/2015] [Indexed: 12/23/2022]
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24
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Barygina V, Becatti M, Lotti T, Moretti S, Taddei N, Fiorillo C. Treatment with low-dose cytokines reduces oxidative-mediated injury in perilesional keratinocytes from vitiligo skin. J Dermatol Sci 2015; 79:163-70. [DOI: 10.1016/j.jdermsci.2015.05.003] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2015] [Accepted: 05/11/2015] [Indexed: 01/08/2023]
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25
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Effect of thioridazine on antioxidant status of HEMn-DP melanocytes. Naunyn Schmiedebergs Arch Pharmacol 2015; 388:1097-104. [PMID: 26105001 PMCID: PMC4561062 DOI: 10.1007/s00210-015-1144-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Accepted: 06/05/2015] [Indexed: 01/11/2023]
Abstract
Thioridazine as an antipsychotic agent was extensively used to treat various psychotic disorders, e.g. schizophrenia. However, the therapy with this drug can induce serious side effects such as extrapyramidal symptoms or ocular and skin disorders, which mechanisms are still not fully established. To gain inside the molecular mechanisms underlying thioridazine toxicity, we examined the effect of this drug on cell viability, antioxidant defence system as well as melanogenesis in normal human melanocytes. It was demonstrated that thioridazine induces concentration-dependent loss in cell viability. The value of EC50 was calculated to be 2.24 μM. To study the effect of thioridazine on antioxidant defence system in melanocytes, the level of hydrogen peroxide and the activities of antioxidant enzymes superoxide dismutase, catalase and glutathione peroxidase were determined. The drug in concentrations of 0.1, 0.25, 1.0 and 2.5 μM caused changes in cellular antioxidant defence system indicating the induction of oxidative stress. It was also shown that the analysed neuroleptic in concentrations of 1.0 and 2.5 μM significantly inhibited melanogenesis. The observed changes in cell viability, antioxidant defence system and melanization in normal human melanocytes after thioridazine treatment may explain an important role of reactive oxygen species as well as melanin in mechanisms involved in this drug side effects directed on pigmented tissues.
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26
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He J, Li X, Li Y, Ren B, Sun J, Zhang W, Li W. Lack of association between the 389C>T polymorphism (rs769217) in the catalase (CAT) gene and the risk of vitiligo: An update by meta-analysis. Australas J Dermatol 2014; 56:180-5. [PMID: 25139332 DOI: 10.1111/ajd.12204] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2013] [Accepted: 06/02/2014] [Indexed: 02/03/2023]
Affiliation(s)
- Jie He
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Xiaoyan Li
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Yunhui Li
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Bocheng Ren
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Jian Sun
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Wei Zhang
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
| | - Wancheng Li
- First Affiliated Hospital of Chengdu Medical College; Chengdu China
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27
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Denat L, Kadekaro AL, Marrot L, Leachman SA, Abdel-Malek ZA. Melanocytes as instigators and victims of oxidative stress. J Invest Dermatol 2014; 134:1512-1518. [PMID: 24573173 PMCID: PMC4418514 DOI: 10.1038/jid.2014.65] [Citation(s) in RCA: 229] [Impact Index Per Article: 22.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 01/08/2014] [Accepted: 01/15/2014] [Indexed: 12/30/2022]
Abstract
Epidermal melanocytes are particularly vulnerable to oxidative stress owing to the pro-oxidant state generated during melanin synthesis, and to the intrinsic antioxidant defenses that are compromised in pathologic conditions. Melanoma is thought to be oxidative stress driven, and melanocyte death in vitiligo is thought to be instigated by a highly pro-oxidant state in the epidermis. We review the current knowledge about melanin and the redox state of melanocytes, how paracrine factors help counteract oxidative stress, the role of oxidative stress in melanoma initiation and progression and in melanocyte death in vitiligo, and how this knowledge can be harnessed for melanoma and vitiligo treatment.
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Affiliation(s)
- Laurence Denat
- L'OREAL Research and Innovation, Aulnay-sous-Bois, France
| | - Ana L Kadekaro
- Department of Dermatology, University of Cincinnati, Cincinnati, Ohio, USA
| | - Laurent Marrot
- L'OREAL Research and Innovation, Aulnay-sous-Bois, France
| | - Sancy A Leachman
- Department of Dermatology, Oregon Health Sciences University, Portland, Oregon, USA
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28
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Wu HL, Pang SL, Liu QZ, Wang Q, Cai MX, Shang J. 5-HT1A/1B receptors as targets for optimizing pigmentary responses in C57BL/6 mouse skin to stress. PLoS One 2014; 9:e89663. [PMID: 24586946 PMCID: PMC3931828 DOI: 10.1371/journal.pone.0089663] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2013] [Accepted: 01/21/2014] [Indexed: 02/05/2023] Open
Abstract
Stress has been reported to induce alterations of skin pigmentary response. Acute stress is associated with increased turnover of serotonin (5-hydroxytryptamine; 5-HT) whereas chronic stress causes a decrease. 5-HT receptors have been detected in pigment cells, indicating their role in skin pigmentation. To ascertain the precise role of 5-HT in stress-induced pigmentary responses, C57BL/6 mice were subjected to chronic restraint stress and chronic unpredictable mild stress (CRS and CUMS, two models of chronic stress) for 21 days, finally resulting in abnormal pigmentary responses. Subsequently, stressed mice were characterized by the absence of a black pigment in dorsal coat. The down-regulation of tyrosinase (TYR) and tyrosinase-related proteins (TRP1 and TRP2) expression in stressed skin was accompanied by reduced levels of 5-HT and decreased expression of 5-HT receptor (5-HTR) system. In both murine B16F10 melanoma cells and normal human melanocytes (NHMCs), 5-HT had a stimulatory effect on melanin production, dendricity and migration. When treated with 5-HT in cultured hair follicles (HFs), the increased expression of melanogenesis-related genes and the activation of 5-HT1A, 1B and 7 receptors also occurred. The serum obtained from stressed mice showed significantly decreased tyrosinase activity in NHMCs compared to that from nonstressed mice. The decrease in tyrosinase activity was further augmented in the presence of 5-HTR1A, 1B and 7 antagonists, WAY100635, SB216641 and SB269970. In vivo, stressed mice received 5-HT precursor 5-hydroxy-l-tryptophan (5-HTP), a member of the class of selective serotonin reuptake inhibitors (fluoxetine; FX) and 5-HTR1A/1B agonists (8-OH-DPAT/CP94253), finally contributing to the normalization of pigmentary responses. Taken together, these data strongly suggest that the serotoninergic system plays an important role in the regulation of stress-induced depigmentation, which can be mediated by 5-HT1A/1B receptors. 5-HT and 5-HTR1A/1B may constitute novel targets for therapy of skin hypopigmentation disorders, especially those worsened with stress.
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Affiliation(s)
- Hua-Li Wu
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
| | - Si-Lin Pang
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
| | - Qiong-Zhen Liu
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
| | - Qian Wang
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
| | - Min-Xuan Cai
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
| | - Jing Shang
- New Drug Screening Center, China Pharmaceutical University, Nanjing, China
- * E-mail:
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29
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Affiliation(s)
- K.U. Schallreuter
- Institute for Pigmentary Disorders in Association with EM Arndt University; Greifswald Germany
- Centre for Skin Sciences; School of Life Sciences; University of Bradford; Bradford U.K
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30
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Laddha NC, Dwivedi M, Gani AR, Shajil EM, Begum R. Involvement of superoxide dismutase isoenzymes and their genetic variants in progression of and higher susceptibility to vitiligo. Free Radic Biol Med 2013; 65:1110-1125. [PMID: 24036105 DOI: 10.1016/j.freeradbiomed.2013.08.189] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/26/2013] [Revised: 08/06/2013] [Accepted: 08/29/2013] [Indexed: 02/07/2023]
Abstract
Oxidative stress has been implicated as the initial triggering event in vitiligo pathogenesis leading to melanocyte destruction. Here, we report a significant increase in oxidative stress in vitiligo patients as evidenced by high lipid peroxidation levels suggesting an imbalance in the antioxidant enzyme system as reported in our previous studies. This study examined the role of the enzymatic antioxidant SOD, which converts the pro-oxidant superoxide into H2O2, in vitiligo pathogenesis. The activity of three isoforms of SOD, i.e., SOD1, SOD2, and SOD3, was significantly higher in vitiligo patients. To identify the underlying mechanism for the increase in activities of SOD isoforms, we explored the SOD1, SOD2, and SOD3 genes for their genetic variations and transcript levels. The SOD2 Thr58Ile (rs35289490) and Leu84Phe (rs11575993) polymorphisms were significantly associated with vitiligo patients, and the Val16Ala (rs4880) polymorphism was associated with active vitiligo patients. Interestingly, SOD2 activity was contributed by these polymorphisms along with its increase in transcript levels in patients. SOD3 activity was associated with the Arg213Gly (rs8192291) polymorphism. The SOD3 transcript levels were also increased in patients, which might contribute to the increased SOD3 activity. However, we could not establish the genotype-phenotype correlation for SOD1 as we could not detect any novel or reported SNPs in SOD1. In addition, both transcript and protein levels of SOD1 were unchanged between patients and controls, though SOD1 activity was increased in patients. Activities of SOD isoforms also correlated with progression of the disease as the activity was higher in active cases of vitiligo compared to stable cases. Here, we report that SOD2 and SOD3 polymorphisms may be genetic risk factors for susceptibility and progression of vitiligo and hence the genetic makeup of an individual may form a basis for the effective treatment of the disease. Overall, our results suggest that increased activity of SOD isoforms under the influence of genetic factors may lead to accumulation of H2O2 in cytoplasmic, mitochondrial, and extracellular compartments resulting in oxidative damage to the melanocytes.
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Affiliation(s)
- Naresh C Laddha
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India
| | - Mitesh Dwivedi
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India
| | - Amina R Gani
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India
| | - E M Shajil
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India
| | - Rasheedunnisa Begum
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, Gujarat 390002, India.
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31
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Thomas AH, Serrano MP, Rahal V, Vicendo P, Claparols C, Oliveros E, Lorente C. Tryptophan oxidation photosensitized by pterin. Free Radic Biol Med 2013; 63:467-75. [PMID: 23747929 DOI: 10.1016/j.freeradbiomed.2013.05.044] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 05/22/2013] [Accepted: 05/30/2013] [Indexed: 10/26/2022]
Abstract
Pterins are normal components of cells and they have been previously identified as good photosensitizers under UV-A irradiation, inducing DNA damage and oxidation of nucleotides. In this work, we have investigated the ability of pterin (Ptr), the parent compound of oxidized pterins, to photosensitize the oxidation of another class of biomolecules, amino acids, using tryptophan (Trp) as a model compound. Irradiation of Ptr in the UV-A spectral range (350 nm) in aerated aqueous solutions containing Trp led to the consumption of the latter, whereas the Ptr concentration remained unchanged. Concomitantly, hydrogen peroxide (H₂O₂) was produced. Although Ptr is a singlet oxygen ((1)O₂) sensitizer, the degradation of Trp was inhibited in O₂-saturated solutions, indicating that a (1)O₂-mediated process (type II oxidation) was not an important pathway leading to Trp oxidation. By combining different analytical techniques, we could establish that a type I photooxidation was the prevailing mechanism, initiated by an electron transfer from the Trp molecule to the Ptr triplet excited state, yielding the corresponding radical ions (Trp(·+)/Trp(-H)· and Ptr(·-)). The Trp reaction products that could be identified by UPLC-mass spectrometry are in agreement with this conclusion.
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Affiliation(s)
- Andrés H Thomas
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas, Departamento de Química, Facultad de Ciencias Exactas, Universidad Nacional de La Plata, CCT La Plata-CONICET, Boulevard 113 y 64, 1900 La Plata, Argentina
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32
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Esser C, Bargen I, Weighardt H, Haarmann-Stemmann T, Krutmann J. Functions of the aryl hydrocarbon receptor in the skin. Semin Immunopathol 2013; 35:677-91. [PMID: 23949496 DOI: 10.1007/s00281-013-0394-4] [Citation(s) in RCA: 131] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2013] [Accepted: 07/16/2013] [Indexed: 12/13/2022]
Abstract
Among other functions, the skin serves as the barrier against the environment and provides vital protection from physical or chemical harm and from infection. Skin cells express the aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor and sensor of environmental chemicals; at the same time, AHR ligands are abundant in skin from exogenous or endogenous sources. For example, solar radiation, in particular ultraviolet (UV) B, generates AHR ligands from tryptophan in the skin. Recent evidence has shown that AHR is involved in the (patho)physiology of skin including the regulation of skin pigmentation, photocarcinogenesis, and skin inflammation. We here provide a state-of-the-art summary of work which relates to the role of the AHR in (1) adaptive responses against environmental challenges such as UVB or topical chemicals and (2) intrinsic developmental roles for homeostasis of skin cells and (3) skin immunity. We also discuss the existing evidence that AHR antagonists or AHR ligands may be used for the prevention and/or treatment of skin disease.
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Affiliation(s)
- Charlotte Esser
- Leibniz-Research Institute for Environmental Medicine (IUF), Auf'm Hennekamp 50, 40225, Dusseldorf, Germany,
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33
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Schallreuter KU, Salem MAEL, Holtz S, Panske A. Basic evidence for epidermal H2O2/ONOO(-)-mediated oxidation/nitration in segmental vitiligo is supported by repigmentation of skin and eyelashes after reduction of epidermal H2O2 with topical NB-UVB-activated pseudocatalase PC-KUS. FASEB J 2013; 27:3113-22. [PMID: 23629861 DOI: 10.1096/fj.12-226779] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Nonsegmental vitiligo (NSV) is characterized by loss of inherited skin color. The cause of the disease is still unknown despite accumulating in vivo and in vitro evidence of massive epidermal oxidative stress via H2O2 and peroxynitrite (ONOO(-)) in affected individuals. The most favored hypothesis is based on autoimmune mechanisms. Strictly segmental vitiligo (SSV) with dermatomal distribution is a rare entity, often associated with stable outcome. Recently, it was documented that this form can be associated with NSV (mixed vitiligo). We here asked the question whether ROS and possibly ONOO(-) could be players in the pathogenesis of SSV. Our in situ results demonstrate for the first time epidermal biopterin accumulation together with significantly decreased epidermal catalase, thioredoxin/thioreoxin reductase, and MSRA/MSRB expression. Moreover, we show epidermal ONOO(-) accumulation. In vivo FT-Raman spectroscopy reveals the presence of H2O2, methionine sulfoxide, and tryptophan metabolites; i.e., N-formylkynurenine and kynurenine, implying Fenton chemistry in the cascade (n=10). Validation of the basic data stems from successful repigmentation of skin and eyelashes in affected individuals, regardless of SSV or segmental vitiligo in association with NSV after reduction of epidermal H2O2 (n=5). Taken together, our contribution strongly supports H2O2/ONOO-mediated stress in the pathogenesis of SSV. Our findings offer new treatment intervention for lost skin and hair color.
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Affiliation(s)
- Karin U Schallreuter
- Institute for Pigmentary Disorders, E. M. Arndt University, Greifswald, Germany.
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34
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Ruksha TG, Aksenenko MB, Sergeyeva YY, Fefelova YA. Skin melanoma: from systematic biology to the personalized therapy. VESTNIK DERMATOLOGII I VENEROLOGII 2013. [DOI: 10.25208/vdv555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Systematic biology is a new field of biomedicine based on the integrative approach to molecular mechanisms of the operation of living systems including in case of the development of pathological processes. In this connection, up-to-date therapeutic approaches to skin melanoma treatment can be considered on the basis of key changes in intermolecular interactions taking place during tumor development.
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35
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KOMINA AV, KOROSTILEVA KA, GYRYLOVA SN, BELONOGOV RN, RUKSHA TG. Interaction Between Single Nucleotide Polymorphism in Catalase Gene and Catalase Activity Under the Conditions of Oxidative Stress. Physiol Res 2012; 61:655-8. [DOI: 10.33549/physiolres.932333] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
Abstract
Catalase is an antioxidant enzyme the activity of which is crucial for the protection against damage caused by reactive oxygen species. The –262C>T polymorphism in the promoter region of catalase gene was found to be associated with altered catalase levels. In this study, peripheral blood mononuclear cells catalase activity was measured after H2O2-induced oxidative stress. C/T and T/T genotypes were associated with the decrease of catalase levels in contrast to C/C donors who had elevated catalase activity in the presence of 0.4 and 0.7 mM H2O2. Genotype-dependent response of catalase activity to oxidative stress might be related to the predisposition of catalase mutant allele carriers to disorders mediated by oxidative stress.
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Affiliation(s)
| | | | | | | | - T. G. RUKSHA
- Department of Pathophysiology, Krasnoyarsk State Medical University Named After V. F. Voino-Yasenetsky, Russian Federation Ministry for Health and Social Development, Krasnoyarsk, Russia
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