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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; 115:33-41. [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] [MESH Headings] [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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Li Y, Zeng Y, Chen Z, Tan X, Mei X, Wu Z. The role of aryl hydrocarbon receptor in vitiligo: a review. Front Immunol 2024; 15:1291556. [PMID: 38361944 PMCID: PMC10867127 DOI: 10.3389/fimmu.2024.1291556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Accepted: 01/18/2024] [Indexed: 02/17/2024] Open
Abstract
Vitiligo is an acquired autoimmune dermatosis characterized by patchy skin depigmentation, causing significant psychological distress to the patients. Genetic susceptibility, environmental triggers, oxidative stress, and autoimmunity contribute to melanocyte destruction in vitiligo. Due to the diversity and complexity of pathogenesis, the combination of inhibiting melanocyte destruction and stimulating melanogenesis gives the best results in treating vitiligo. The aryl hydrocarbon receptor (AhR) is a ligand-activated transcription factor that can regulate the expression of various downstream genes and play roles in cell differentiation, immune response, and physiological homeostasis maintenance. Recent studies suggested that AhR signaling pathway was downregulated in vitiligo. Activation of AhR pathway helps to activate antioxidant pathways, inhibit abnormal immunity response, and upregulate the melanogenesis gene, thereby protecting melanocytes from oxidative stress damage, controlling disease progression, and promoting lesion repigmentation. Here, we review the relevant literature and summarize the possible roles of the AhR signaling pathway in vitiligo pathogenesis and treatment, to further understand the links between the AhR and vitiligo, and provide new potential therapeutic strategies.
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Affiliation(s)
- Yiting Li
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Yibin Zeng
- Department of Dermatology, Minhang Hospital, Fudan University, Shanghai, China
| | - Zile Chen
- 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
| | - 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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3
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Ogawa T, Ishitsuka Y. NRF2 in the Epidermal Pigmentary System. Biomolecules 2022; 13:biom13010020. [PMID: 36671405 PMCID: PMC9855619 DOI: 10.3390/biom13010020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/20/2022] [Accepted: 12/21/2022] [Indexed: 12/25/2022] Open
Abstract
Melanogenesis is a major part of the environmental responses and tissue development of the integumentary system. The balance between reduction and oxidation (redox) governs pigmentary responses, for which coordination among epidermal resident cells is indispensable. Here, we review the current understanding of melanocyte biology with a particular focus on the "master regulator" of oxidative stress responses (i.e., the Kelch-like erythroid cell-derived protein with cap'n'collar homology-associated protein 1-nuclear factor erythroid-2-related factor 2 system) and the autoimmune pigment disorder vitiligo. Our investigation revealed that the former is essential in pigmentogenesis, whereas the latter results from unbalanced redox homeostasis and/or defective intercellular communication in the interfollicular epidermis (IFE). Finally, we propose a model in which keratinocytes provide a "niche" for differentiated melanocytes and may "imprint" IFE pigmentation.
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Affiliation(s)
- Tatsuya Ogawa
- Department of Dermatology, Faculty of Medicine, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan
| | - Yosuke Ishitsuka
- Department of Dermatology, Osaka University Graduate School of Medicine, 2-2 Yamadaoka, Suita 565-0871, Japan
- Correspondence: ; Tel.: +81-66-879-3031; Fax: +81-66-879-3039
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4
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Grishanova AY, Perepechaeva ML. Aryl Hydrocarbon Receptor in Oxidative Stress as a Double Agent and Its Biological and Therapeutic Significance. Int J Mol Sci 2022; 23:6719. [PMID: 35743162 PMCID: PMC9224361 DOI: 10.3390/ijms23126719] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2022] [Revised: 06/14/2022] [Accepted: 06/14/2022] [Indexed: 12/02/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) has long been implicated in the induction of a battery of genes involved in the metabolism of xenobiotics and endogenous compounds. AhR is a ligand-activated transcription factor necessary for the launch of transcriptional responses important in health and disease. In past decades, evidence has accumulated that AhR is associated with the cellular response to oxidative stress, and this property of AhR must be taken into account during investigations into a mechanism of action of xenobiotics that is able to activate AhR or that is susceptible to metabolic activation by enzymes encoded by the genes that are under the control of AhR. In this review, we examine various mechanisms by which AhR takes part in the oxidative-stress response, including antioxidant and prooxidant enzymes and cytochrome P450. We also show that AhR, as a participant in the redox balance and as a modulator of redox signals, is being increasingly studied as a target for a new class of therapeutic compounds and as an explanation for the pathogenesis of some disorders.
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Affiliation(s)
| | - Maria L. Perepechaeva
- Federal Research Center of Fundamental and Translational Medicine, Institute of Molecular Biology and Biophysics, Timakova Str. 2, 630117 Novosibirsk, Russia;
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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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6
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Harris KL, Thomson RES, Gumulya Y, Foley G, Carrera-Pacheco SE, Syed P, Janosik T, Sandinge AS, Andersson S, Jurva U, Bodén M, Gillam EMJ. Ancestral sequence reconstruction of a cytochrome P450 family involved in chemical defence reveals the functional evolution of a promiscuous, xenobiotic-metabolizing enzyme in vertebrates. Mol Biol Evol 2022; 39:6593376. [PMID: 35639613 PMCID: PMC9185370 DOI: 10.1093/molbev/msac116] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The cytochrome P450 family 1 enzymes (CYP1s) are a diverse family of hemoprotein monooxygenases, which metabolize many xenobiotics including numerous environmental carcinogens. However, their historical function and evolution remain largely unstudied. Here we investigate CYP1 evolution via the reconstruction and characterization of the vertebrate CYP1 ancestors. Younger ancestors and extant forms generally demonstrated higher activity toward typical CYP1 xenobiotic and steroid substrates than older ancestors, suggesting significant diversification away from the original CYP1 function. Caffeine metabolism appears to be a recently evolved trait of the CYP1A subfamily, observed in the mammalian CYP1A lineage, and may parallel the recent evolution of caffeine synthesis in multiple separate plant species. Likewise, the aryl hydrocarbon receptor agonist, 6-formylindolo[3,2-b]carbazole (FICZ) was metabolized to a greater extent by certain younger ancestors and extant forms, suggesting that activity toward FICZ increased in specific CYP1 evolutionary branches, a process that may have occurred in parallel to the exploitation of land where UV-exposure was higher than in aquatic environments. As observed with previous reconstructions of P450 enzymes, thermostability correlated with evolutionary age; the oldest ancestor was up to 35 °C more thermostable than the extant forms, with a 10T50 (temperature at which 50% of the hemoprotein remains intact after 10 min) of 71 °C. This robustness may have facilitated evolutionary diversification of the CYP1s by buffering the destabilizing effects of mutations that conferred novel functions, a phenomenon which may also be useful in exploiting the catalytic versatility of these ancestral enzymes for commercial application as biocatalysts.
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Affiliation(s)
- Kurt L Harris
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Raine E S Thomson
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Yosephine Gumulya
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Gabriel Foley
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Saskya E Carrera-Pacheco
- Centro de Investigación Biomédica, Facultad de Ciencias de la Salud Eugenio Espejo, Universidad UTE, Quito 170147, Ecuador
| | - Parnayan Syed
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Tomasz Janosik
- RISE Research Institutes of Sweden, Division Bioeconomy and Health, Chemical Process and Pharmaceutical Development, Södertälje, Sweden
| | - Ann-Sofie Sandinge
- DMPK, Early Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, Astrazeneca, Gothenburg, Sweden
| | - Shalini Andersson
- Discovery Sciences, BioPharmaceuticals R&D, Astrazeneca, Gothenburg, Sweden
| | - Ulrik Jurva
- DMPK, Early Cardiovascular, Renal and Metabolism, BioPharmaceuticals R&D, Astrazeneca, Gothenburg, Sweden
| | - Mikael Bodén
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
| | - Elizabeth M J Gillam
- School of Chemistry and Molecular Biosciences, The University of Queensland, St. Lucia, Brisbane, 4072 Australia
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7
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Vogeley C, Rolfes KM, Krutmann J, Haarmann-Stemmann T. The Aryl Hydrocarbon Receptor in the Pathogenesis of Environmentally-Induced Squamous Cell Carcinomas of the Skin. Front Oncol 2022; 12:841721. [PMID: 35311158 PMCID: PMC8927079 DOI: 10.3389/fonc.2022.841721] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/09/2022] [Indexed: 01/05/2023] Open
Abstract
Cutaneous squamous cell carcinoma (SCC) is one of the most frequent malignancies in humans and academia as well as public authorities expect a further increase of its incidence in the next years. The major risk factor for the development of SCC of the general population is the repeated and unprotected exposure to ultraviolet (UV) radiation. Another important risk factor, in particular with regards to occupational settings, is the chronic exposure to polycyclic aromatic hydrocarbons (PAH) which are formed during incomplete combustion of organic material and thus can be found in coal tar, creosote, bitumen and related working materials. Importantly, both exposomal factors unleash their carcinogenic potential, at least to some extent, by activating the aryl hydrocarbon receptor (AHR). The AHR is a ligand-dependent transcription factor and key regulator in xenobiotic metabolism and immunity. The AHR is expressed in all cutaneous cell-types investigated so far and maintains skin integrity. We and others have reported that in response to a chronic exposure to environmental stressors, in particular UV radiation and PAHs, an activation of AHR and downstream signaling pathways critically contributes to the development of SCC. Here, we summarize the current knowledge about AHR's role in skin carcinogenesis and focus on its impact on defense mechanisms, such as DNA repair, apoptosis and anti-tumor immune responses. In addition, we discuss the possible consequences of a simultaneous exposure to different AHR-stimulating environmental factors for the development of cutaneous SCC.
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Affiliation(s)
- Christian Vogeley
- IUF - Leibniz-Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Katharina M Rolfes
- IUF - Leibniz-Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Jean Krutmann
- IUF - Leibniz-Research Institute for Environmental Medicine, Düsseldorf, Germany
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8
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Research Progress on Targeted Antioxidant Therapy and Vitiligo. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2022; 2022:1821780. [PMID: 35320978 PMCID: PMC8938057 DOI: 10.1155/2022/1821780] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/19/2021] [Accepted: 01/22/2022] [Indexed: 12/14/2022]
Abstract
Vitiligo is a common acquired depigmenting disease characterized by the loss of functional melanocytes and epidermal melanin. Vitiligo has a long treatment cycle and slow results, which is one of the most difficult challenges for skin diseases. Oxidative stress plays an important role as an initiating and driving factor in the pathogenesis of vitiligo. Antioxidant therapy has recently become a research hotspot in vitiligo treatment. A series of antioxidants has been discovered and applied to the treatment of vitiligo, which has returned satisfactory results. This article briefly reviews the relationship between oxidative stress and vitiligo. We also describe the progress of targeted antioxidant therapy in vitiligo, with the aim of providing a reference for new drug development and treatment options for this condition.
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9
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Rannug A. 6-Formylindolo[3,2-b]carbazole, a Potent Ligand for the Aryl Hydrocarbon Receptor Produced Both Endogenously and by Microorganisms, can Either Promote or Restrain Inflammatory Responses. FRONTIERS IN TOXICOLOGY 2022; 4:775010. [PMID: 35295226 PMCID: PMC8915874 DOI: 10.3389/ftox.2022.775010] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Accepted: 01/11/2022] [Indexed: 12/13/2022] Open
Abstract
The aryl hydrocarbon receptor (AHR) binds major physiological modifiers of the immune system. The endogenous 6-formylindolo[3,2-b]carbazole (FICZ), which binds with higher affinity than any other compound yet tested, including TCDD, plays a well-documented role in maintaining the homeostasis of the intestines and skin. The effects of transient activation of AHR by FICZ differ from those associated with continuous stimulation and, depending on the dose, include either differentiation into T helper 17 cells that express proinflammatory cytokines or into regulatory T cells or macrophages with anti-inflammatory properties. Moreover, in experimental models of human diseases high doses stimulate the production of immunosuppressive cytokines and suppress pathogenic autoimmunity. In our earlier studies we characterized the formation of FICZ from tryptophan via the precursor molecules indole-3-pyruvate and indole-3-acetaldehyde. In the gut formation of these precursor molecules is catalyzed by microbial aromatic-amino-acid transaminase ArAT. Interestingly, tryptophan can also be converted into indole-3-pyruvate by the amino-acid catabolizing enzyme interleukin-4 induced gene 1 (IL4I1), which is secreted by host immune cells. By thus generating derivatives of tryptophan that activate AHR, IL4I1 may have a role to play in anti-inflammatory responses, as well as in a tumor escape mechanism that reduces survival in cancer patients. The realization that FICZ can be produced from tryptophan by sunlight, by enzymes expressed in our cells (IL4I1), and by microorganisms as well makes it highly likely that this compound is ubiquitous in humans. A diurnal oscillation in the level of FICZ that depends on the production by the fluctuating number of microbes might influence not only intestinal and dermal immunity locally, but also systemic immunity.
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10
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Rannug JU. Which are the Keystones in the Dynamic AHR-CYP1A1 Signaling Network? J Invest Dermatol 2021; 142:1758-1760. [PMID: 34740583 DOI: 10.1016/j.jid.2021.10.022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2021] [Revised: 10/26/2021] [Accepted: 10/28/2021] [Indexed: 11/30/2022]
Affiliation(s)
- John Ulf Rannug
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, Stockholm, Sweden.
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11
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Rolfes KM, Sondermann NC, Vogeley C, Dairou J, Gilardino V, Wirth R, Meller S, Homey B, Krutmann J, Lang D, Nakamura M, Haarmann-Stemmann T. Inhibition of 6-formylindolo[3,2-b]carbazole metabolism sensitizes keratinocytes to UVA-induced apoptosis: Implications for vemurafenib-induced phototoxicity. Redox Biol 2021; 46:102110. [PMID: 34418602 PMCID: PMC8379514 DOI: 10.1016/j.redox.2021.102110] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Revised: 08/16/2021] [Accepted: 08/16/2021] [Indexed: 11/24/2022] Open
Abstract
Ultraviolet (UV) B irradiation of keratinocytes results in the formation of the tryptophan photoproduct 6-formylindolo[3,2-b]carbazole (FICZ) which is a high-affinity ligand for the aryl hydrocarbon receptor (AHR). The resulting activation of AHR signaling induces the expression of cytochrome P450 (CYP) 1A1 which subsequently metabolizes FICZ. Importantly, FICZ is also a nanomolar photosensitizer for UVA radiation. Here, we assess whether a manipulation of the AHR-CYP1A1 axis in human epidermal keratinocytes affects FICZ/UVA-induced phototoxic effects and whether this interaction might be mechanistically relevant for the phototoxicity of the BRAF inhibitor vemurafenib. Treatment of keratinocytes with an AHR agonist enhanced the CYP1A1-catalyzed metabolism of FICZ and thus prevented UVA photosensitization, whereas an inhibition of either AHR signaling or CYP1A1 enzyme activity resulted in an accumulation of FICZ and a sensitization to UVA-induced oxidative stress and apoptosis. Exposure of keratinocytes to vemurafenib resulted in the same outcome. Specifically, CYP phenotyping revealed that vemurafenib is primarily metabolized by CYP1A1 and to a lesser degree by CYP2J2 and CYP3A4. Hence, vemurafenib sensitized keratinocytes to UVA-induced apoptosis by interfering with the CYP1A1-mediated oxidative metabolism of FICZ. In contrast to this pro-apoptotic effect, a treatment of UVB-damaged keratinocytes with vemurafenib suppressed apoptosis, a process which might contribute to the skin carcinogenicity of the drug. Our results provide insight into the mechanisms responsible for the photosensitizing properties of vemurafenib and deliver novel information about its metabolism which might be relevant regarding potential drug-drug interactions. The data emphasize that the AHR-CYP1A1 axis contributes to the pathogenesis of cutaneous adverse drug reactions.
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Affiliation(s)
- Katharina M Rolfes
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
| | - Natalie C Sondermann
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
| | - Christian Vogeley
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
| | - Julien Dairou
- Laboratoire de Chimie et Biochimie Pharmacologiques et Toxicologiques, CNRS, UMR 8601, Université de Paris, F-75006, Paris, France
| | - Viola Gilardino
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
| | - Ragnhild Wirth
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
| | - Stephan Meller
- Department of Dermatology, Medical Faculty, Heinrich-Heine-University, 40225, Düsseldorf, Germany
| | - Bernhard Homey
- Department of Dermatology, Medical Faculty, Heinrich-Heine-University, 40225, Düsseldorf, Germany
| | - Jean Krutmann
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany; Medical Faculty, Heinrich-Heine-University, 40225, Düsseldorf, Germany
| | - Dieter Lang
- Bayer AG, Drug Metabolism and Pharmacokinetics, Research Center, 42096, Wuppertal, Germany
| | - Motoki Nakamura
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany; Department of Environmental and Geriatric Dermatology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, 467-8601, Japan
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12
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Trajectory Shifts in Interdisciplinary Research of the Aryl Hydrocarbon Receptor-A Personal Perspective on Thymus and Skin. Int J Mol Sci 2021; 22:ijms22041844. [PMID: 33673338 PMCID: PMC7918350 DOI: 10.3390/ijms22041844] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Revised: 02/08/2021] [Accepted: 02/10/2021] [Indexed: 12/13/2022] Open
Abstract
Identifying historical trajectories is a useful exercise in research, as it helps clarify important, perhaps even “paradigmatic”, shifts in thinking and moving forward in science. In this review, the development of research regarding the role of the transcription factor “aryl hydrocarbon receptor” (AHR) as a mediator of the toxicity of environmental pollution towards a link between the environment and a healthy adaptive response of the immune system and the skin is discussed. From this fascinating development, the opportunities for targeting the AHR in the therapy of many diseases become clear.
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13
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Liu B, Xie Y, Mei X, Sun Y, Shi W, Wu Z. Reciprocal regulation of interleukin-17A and interleukin-22 secretion through aryl hydrocarbon receptor activation in CD4 + T cells of patients with vitiligo. Exp Ther Med 2020; 21:158. [PMID: 33456525 PMCID: PMC7792475 DOI: 10.3892/etm.2020.9589] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Accepted: 02/28/2020] [Indexed: 02/06/2023] Open
Abstract
Previous studies have shown the participation of the cytokines interleukin (IL) 17A and IL22 in the development of vitiligo. The aryl hydrocarbon receptor (AhR) functions in the pathogenesis of vitiligo and can modulate cytokine production. The aim of the present study was to determine the relationship between AhR activation and the secretion of IL17A and IL22 in CD4+ T cells in vitiligo. A total of 20 newly diagnosed patients with progressive, unstable vitiligo and 20 healthy controls were recruited. CD4+ T cells and skin samples were collected. Immunohistochemistry, ELISA, reverse transcription-quantitative PCR, western blotting and RNA interference experiments were performed. The expression of AhR was significantly lower in the CD4+ T cells and skin, both lesional and nonlesional, of patients with vitiligo compared with healthy subjects. AhR expression was markedly lower in nonlesional compared with lesional skin of patients with vitiligo. The expression levels of IL17A and IL22 were significantly higher in patients with vitiligo compared with healthy subjects. Knockdown of AhR significantly increased the production of IL17A and markedly decreased IL22 levels in the CD4+ T cells of patients with vitiligo. Ginkgo biloba extract EGb 761 activated AhR, inhibited IL17A secretion and enhanced IL22 release in the CD4+ T cells of patients with vitiligo. In conclusion, reduced AhR expression is associated with progressive, unstable vitiligo. Activation of AhR with G. biloba extract EGb 761 may have therapeutic potential for decreasing IL17A levels and increasing IL22 levels in patients with vitiligo.
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Affiliation(s)
- Baoyi Liu
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China.,Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Yongyi Xie
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China.,Department of Dermatology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200080, P.R. China
| | - Xingyu Mei
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China
| | - Yue Sun
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China
| | - Weimin Shi
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China
| | - Zhouwei Wu
- Department of Dermatology, Shanghai General Hospital, Shanghai Jiaotong University, Shanghai 200080, P.R. China
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Ding Q, Tian Y, Wang X, Li P, Su D, Wu C, Zhang W, Tang B. Oxidative Damage of Tryptophan Hydroxylase-2 Mediated by Peroxisomal Superoxide Anion Radical in Brains of Mouse with Depression. J Am Chem Soc 2020; 142:20735-20743. [PMID: 33237755 DOI: 10.1021/jacs.0c09576] [Citation(s) in RCA: 47] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Depression is intimately linked with oxidative stress in the brains. Peroxisome plays vital roles in the regulation of intracellular redox balance by keeping reactive oxygen species (ROS) homeostasis. Available evidence indicates a possible relationship between peroxisomal ROS and depression. Even so, the underlying modulation mechanisms of peroxisomal ROS in depression are still rudimentary due to the limitations of the existing detecting methods. Hence, we developed a two-photon fluorescent probe TCP for the real-time visualization of the first produced ROS superoxide anion radical (O2•-) in peroxisome. Using the two-photon fluorescence imaging, we found that peroxisomal O2•- rose during oxidative stress in the mouse brains, resulting in the inactivation of catalase (CAT). Subsequently, the intracellular H2O2 level elevated, which further oxidized tryptophan hydroxylase-2 (TPH2). Then the decrease contents of TPH2 caused the dysfunction of 5-hydroxytryptamine (5-HT) system in the mouse brains, eventually leading to depression-like behaviors. Our work provides evidence of a peroxisomal O2•- mediated signaling pathway in depression, which will conduce to pinpoint potential targets for the treatment of depression.
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Affiliation(s)
- Qi Ding
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Ying Tian
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Xin Wang
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Ping Li
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Di Su
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Chuanchen Wu
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Wen Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
| | - Bo Tang
- College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institutes of Biomedical Sciences, Shandong Normal University, Jinan 250014, People's Republic of China
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15
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Phelan-Dickinson SJ, Palmer BC, Chen Y, DeLouise LA. The UVR Filter Octinoxate Modulates Aryl Hydrocarbon Receptor Signaling in Keratinocytes via Inhibition of CYP1A1 and CYP1B1. Toxicol Sci 2020; 177:188-201. [PMID: 32603427 DOI: 10.1093/toxsci/kfaa091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Ultraviolet radiation (UVR) is a consistent part of the environment that has both beneficial and harmful effects on human health. UVR filters in the form of commercial sunscreens have been widely used to reduce the negative health effects of UVR exposure. Despite their benefit, literature suggests that some filters can penetrate skin and have off-target biological effects. We noted that many organic filters are hydrophobic and contain aromatic rings, making them potential modulators of Aryl hydrocarbon Receptor (AhR) signaling. We hypothesized that some filters may be able to act as agonists or antagonists on the AhR. Using a luciferase reporter cell line, we observed that the UVR filter octinoxate potentiated the ability of the known AhR ligand, 6-formylindolo[3,2-b]carbazole (FICZ), to activate the AhR. Cotreatments of keratinocytes with octinoxate and FICZ lead to increased levels of cytochrome P4501A1 (CYP1A1) and P4501B1 (CYP1B1) mRNA transcripts, in an AhR-dependent fashion. Mechanistic studies revealed that octinoxate is an inhibitor of CYP1A1 and CYP1B1, with IC50 values at approximately 1 µM and 586 nM, respectively. In vivo topical application of octinoxate and FICZ also elevated CYP1A1 and CYP1B1 mRNA levels in mouse skin. Our results show that octinoxate is able to indirectly modulate AhR signaling by inhibiting CYP1A1 and CYP1B1 enzyme function, which may have important downstream consequences for the metabolism of various compounds and skin integrity. It is important to continue studying the off-target effects of octinoxate and other UVR filters, because they are used on skin on a daily basis world-wide.
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Affiliation(s)
| | - Brian C Palmer
- Department of Environmental Medicine, University of Rochester Medical Center, New York 14642
| | - Yue Chen
- Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627
| | - Lisa A DeLouise
- Department of Environmental Medicine, University of Rochester Medical Center, New York 14642.,Department of Biomedical Engineering, University of Rochester, Rochester, New York 14627.,Department of Dermatology, University of Rochester Medical Center, Rochester, New York 14642
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16
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Rannug A. How the AHR Became Important in Intestinal Homeostasis-A Diurnal FICZ/AHR/CYP1A1 Feedback Controls Both Immunity and Immunopathology. Int J Mol Sci 2020; 21:ijms21165681. [PMID: 32784381 PMCID: PMC7461111 DOI: 10.3390/ijms21165681] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 08/05/2020] [Accepted: 08/06/2020] [Indexed: 12/12/2022] Open
Abstract
Ever since the 1970s, when profound immunosuppression caused by exogenous dioxin-like compounds was first observed, the involvement of the aryl hydrocarbon receptor (AHR) in immunomodulation has been the focus of considerable research interest. Today it is established that activation of this receptor by its high-affinity endogenous ligand, 6-formylindolo[3,2-b]carbazole (FICZ), plays important physiological roles in maintaining epithelial barriers. In the gut lumen, the small amounts of FICZ that are produced from L-tryptophan by microbes are normally degraded rapidly by the inducible cytochrome P4501A1 (CYP1A1) enzyme. This review describes how when the metabolic clearance of FICZ is attenuated by inhibition of CYP1A1, this compound passes through the intestinal epithelium to immune cells in the lamina propria. FICZ, the level of which is thus modulated by this autoregulatory loop involving FICZ itself, the AHR and CYP1A1, plays a central role in maintaining gut homeostasis by potently up-regulating the expression of interleukin 22 (IL-22) by group 3 innate lymphoid cells (ILC3s). IL-22 stimulates various epithelial cells to produce antimicrobial peptides and mucus, thereby both strengthening the epithelial barrier against pathogenic microbes and promoting colonization by beneficial bacteria. Dietary phytochemicals stimulate this process by inhibiting CYP1A1 and causing changes in the composition of the intestinal microbiota. The activity of CYP1A1 can be increased by other microbial products, including the short-chain fatty acids, thereby accelerating clearance of FICZ. In particular, butyrate enhances both the level of the AHR and CYP1A1 activity by stimulating histone acetylation, a process involved in the daily cycle of the FICZ/AHR/CYP1A1 feedback loop. It is now of key interest to examine the potential involvement of FICZ, a major physiological activator of the AHR, in inflammatory disorders and autoimmunity.
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Affiliation(s)
- Agneta Rannug
- Karolinska Institutet, Institute of Environmental Medicine, 171 77 Stockholm, Sweden
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17
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Vogel CFA, Van Winkle LS, Esser C, Haarmann-Stemmann T. The aryl hydrocarbon receptor as a target of environmental stressors - Implications for pollution mediated stress and inflammatory responses. Redox Biol 2020; 34:101530. [PMID: 32354640 PMCID: PMC7327980 DOI: 10.1016/j.redox.2020.101530] [Citation(s) in RCA: 218] [Impact Index Per Article: 54.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2020] [Revised: 03/20/2020] [Accepted: 03/31/2020] [Indexed: 02/08/2023] Open
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor regulating the expression of genes, for instance encoding the monooxygenases cytochrome P450 (CYP) 1A1 and CYP1A2, which are important enzymes in metabolism of xenobiotics. The AHR is activated upon binding of polycyclic aromatic hydrocarbons (PAHs), persistent organic pollutants (POPs), and related ubiquitous environmental chemicals, to mediate their biological and toxic effects. In addition, several endogenous and natural compounds can bind to AHR, thereby modulating a variety of physiological processes. In recent years, ambient particulate matter (PM) associated with traffic related air pollution (TRAP) has been found to contain significant amounts of PAHs. PM containing PAHs are of increasing concern as a class of agonists, which can activate the AHR. Several reports show that PM and AHR-mediated induction of CYP1A1 results in excessive generation of reactive oxygen species (ROS), causing oxidative stress. Furthermore, exposure to PM and PAHs induce inflammatory responses and may lead to chronic inflammatory diseases, including asthma, cardiovascular diseases, and increased cancer risk. In this review, we summarize findings showing the critical role that the AHR plays in mediating effects of environmental pollutants and stressors, which pose a risk of impacting the environment and human health. PAHs present on ambient air pollution particles are ligands of the cellular AHR. AHR-dependent induction of CYP1, AKR, NOX and COX-2 genes can be a source of ROS generation. AHR signaling and NRF2 signaling interact to regulate the expression of antioxidant genes. Air pollution and ROS can affect inflammation, which is partially triggered by AHR and associated immune responses. Skin, lung, and the cardiovascular system are major target sites for air pollution-induced inflammation.
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Affiliation(s)
- Christoph F A Vogel
- Center for Health and the Environment, University of California, One Shields Avenue, Davis, CA, 95616, USA; Department of Environmental Toxicology, University of California, One Shields Avenue, Davis, CA, 95616, USA
| | - Laura S Van Winkle
- Center for Health and the Environment, University of California, One Shields Avenue, Davis, CA, 95616, USA; School of Veterinary Medicine Department of Anatomy, University of California, One Shields Avenue, Davis, CA, 5616, USA
| | - Charlotte Esser
- IUF - Leibniz-Research Institute for Environmental Medicine, 40225, Düsseldorf, Germany
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18
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Zhang B, Wang J, Zhao G, Lin M, Lang Y, Zhang D, Feng D, Tu C. Apigenin protects human melanocytes against oxidative damage by activation of the Nrf2 pathway. Cell Stress Chaperones 2020; 25:277-285. [PMID: 31953635 PMCID: PMC7058778 DOI: 10.1007/s12192-020-01071-7] [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] [Subscribe] [Scholar Register] [Received: 10/17/2019] [Revised: 01/09/2020] [Accepted: 01/10/2020] [Indexed: 12/24/2022] Open
Abstract
Vitiligo is a chronic, autoimmune destruction of melanocytes, resulting in progressively expanding depigmented skin patches. Severity of the disorder, which affects approximately 1% of humans, may be mitigated using topical corticosteroids combined with phototherapy; along with other clinical strategies; however, no definitive cures are currently available. Here, the capacity of apigenin, a plant-derived aglycone, to inhibit oxidative stress-mediated melanocyte depletion in vitro using a PIG3V vitiligo perilesional melanocyte cell model is evaluated. PIG3V cells, treated with selected doses of apigenin, were challenged with H2O2, then assessed for viability and the oxidative stress-related parameters: superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GSH-Px), and malondialdehyde (MDA) by enzyme-linked immunoabsorbent assay (ELISA). Additionally, expression of nuclear factor erythroid 2p45 (NF-E2)-related factor 2 (Nrf2) and downstream targets was detected using Western blotting. Outcomes demonstrated that compared with negative control cultures, apigenin-treated cells exhibited enhanced viability. Likewise, apigenin enhanced expression of the cellular anti-oxidants SOD, CAT, and GSH-Px, but inhibited production of MDA, an oxidative stress biomarker. Interestingly, the expression and nuclear localization of the Nrf2 transcription factor, an important regulator oxidative stress and its downstream target genes, was significantly increased by apigenin treatment. Apigenin influence on Nrf2 was further validated by experiments demonstrating that Nrf2 knockdown cells failed to exhibit significant apigenin-mediated effects on cell viability and oxidative stress. Apigenin's non-toxicity and ability to affect multiple oxidative stress-related parameters through its effects on Nrf2 signaling in melanocytes suggests that it may prove to be a valuable therapeutic tool in long-term management of vitiligo.
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Affiliation(s)
- Baoxiang Zhang
- Department of Dermatology, Yidu Central Hospital, Weifang Medical University, Qingzhou, 262500, Shandong, China
| | - Jing Wang
- Department of Division of Rheumatology, Yidu Central Hospital, Weifang Medical University, Qingzhou, 262500, Shandong, China
| | - Guodong Zhao
- Department of Dermatology, Changle County People's Hospital, Changle, 262400, Shandong, China
| | - Mao Lin
- Department of Dermatology, Chongqing Chinese Medicine Hospital, Yuzhong District, Chongqing, 400011, China
| | - Yong Lang
- Department of Dermatology, Gaomi People's Hospital, Gaomi, 261500, Shandong, China
| | - Diancai Zhang
- Department of Dermatology, Yidu Central Hospital, Weifang Medical University, Qingzhou, 262500, Shandong, China
| | - Dianqin Feng
- Department of Dermatology, Yidu Central Hospital, Weifang Medical University, Qingzhou, 262500, Shandong, China
| | - Caixia Tu
- Department of Dermatology, The 2nd Affiliated Hospital of Dalian Medical University, No.467 Zhongshan Road, Dalian, 116027, Liaoning, China.
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19
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Role of the Aryl Hydrocarbon Receptor in Environmentally Induced Skin Aging and Skin Carcinogenesis. Int J Mol Sci 2019; 20:ijms20236005. [PMID: 31795255 PMCID: PMC6928879 DOI: 10.3390/ijms20236005] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2019] [Revised: 11/22/2019] [Accepted: 11/27/2019] [Indexed: 12/19/2022] Open
Abstract
The skin is constantly exposed to a variety of environmental threats, including solar electromagnetic radiation, microbes, airborne particulate matter, and chemicals. Acute exposure to these environmental factors results in the activation of different signaling pathways that orchestrate adaptive stress responses to maintain cell and tissue homeostasis. Chronic exposure of skin to these factors, however, may lead to the accumulation of damaged macromolecules and loss of cell and tissue integrity, which, over time, may facilitate aging processes and the development of aging-related malignancies. One transcription factor that is expressed in all cutaneous cells and activated by various environmental stressors, including dioxins, polycyclic aromatic hydrocarbons, and ultraviolet radiation, is the aryl hydrocarbon receptor (AHR). By regulating keratinocyte proliferation and differentiation, epidermal barrier function, melanogenesis, and immunity, a certain degree of AHR activity is critical to maintain skin integrity and to adapt to acute stress situations. In contrast, a chronic activation of cutaneous AHR signaling critically contributes to premature aging and the development of neoplasms by affecting metabolism, extracellular matrix remodeling, inflammation, pigmentation, DNA repair, and apoptosis. This article provides an overview of the detrimental effects associated with sustained AHR activity in chronically stressed skin and pinpoints AHR as a promising target for chemoprevention.
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20
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Sang M, Luo R, Bai Y, Dou J, Zhang Z, Liu F, Feng F, Liu W. BHQ-Cyanine-Based "Off-On" Long-Circulating Assembly as a Ferroptosis Amplifier for Cancer Treatment: A Lipid-Peroxidation Burst Device. ACS APPLIED MATERIALS & INTERFACES 2019; 11:42873-42884. [PMID: 31553151 DOI: 10.1021/acsami.9b12469] [Citation(s) in RCA: 44] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ferroptosis is an iron-dependent cell death caused by accumulation of lipid peroxidation (LPO), which is a new strategy for cancer treatment. Th current ferroptosis therapy nanodevices have low efficiency and side effects generally. Hence, we developed a Black Hole Quencher (BHQ)-based fluorescence "off-on" nanophotosensitizer complex assembly (CSO-BHQ-IR780-Hex/MIONPs/Sor). CSO-connected BHQ-IR780-Hex and -loaded magnetic iron oxide nanoparticles (MIONPs) and sorafenib (Sor) formed a very concise functionalized delivery system. CSO-BHQ-IR780-Hex disassembled by GSH attack and released IR780-Hex, MIONPs, and sorafenib. IR780-Hex anchored to the mitochondrial membrane, which would contribute to amplifying the efficiency of the photosensitizer. When NIR irradiation was given to CSO-BHQ-IR780-Hex/MIONPs/Sor-treated cells, iron supply increased, the xCT/GSH/GPX-4 system was triggered, and a lot of LPO burst. A malondialdehyde test showed that LPO in complex assembly-treated cells was explosive and increased about 18-fold compared to the control. The accumulation process of particles was monitored by an IR780-Hex photosensitizer, which showed an excellent tumor target ability by magnetic of nanodevice in vivo. Interestingly, the half-life of sorafenib in a nanodevice was increased about 26-fold compared to the control group. Importantly, the complex assembly effectively inhibits tumor growth in the breast tumor mouse model. This work would provide ideas in designing nanomedicines for the ferroptosis treatment of cancer.
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Affiliation(s)
- Mangmang Sang
- Department of Pharmaceutical Analysis , China Pharmaceutical University , Nanjing 210009 , China
| | - Renjie Luo
- Department of Pharmaceutical Analysis , China Pharmaceutical University , Nanjing 210009 , China
| | - Yidan Bai
- Department of Pharmaceutical Analysis , China Pharmaceutical University , Nanjing 210009 , China
| | - Jun Dou
- Department of Pharmaceutical Analysis , China Pharmaceutical University , Nanjing 210009 , China
| | - Zhongtao Zhang
- Department of Natural Medicinal Chemistry , China Pharmaceutical University , Nanjing 211198 , China
| | | | - Feng Feng
- Department of Natural Medicinal Chemistry , China Pharmaceutical University , Nanjing 211198 , China
- Jiangsu Food & Pharmaceutical Science College , 4 Meicheng Donglu , Huaian 223003 , China
| | - Wenyuan Liu
- Department of Pharmaceutical Analysis , China Pharmaceutical University , Nanjing 210009 , China
- Hangzhou Institute of Pharmaceutical Innovation , China Pharmaceutical University , 291 Fucheng Lu , Hangzhou 310018 , China
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21
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Wang X, Li S, Liu L, Jian Z, Cui T, Yang Y, Guo S, Yi X, Wang G, Li C, Gao T, Li K. Role of the aryl hydrocarbon receptor signaling pathway in promoting mitochondrial biogenesis against oxidative damage in human melanocytes. J Dermatol Sci 2019; 96:33-41. [PMID: 31543430 DOI: 10.1016/j.jdermsci.2019.09.001] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2018] [Revised: 08/14/2019] [Accepted: 09/03/2019] [Indexed: 12/19/2022]
Abstract
BACKGROUND Reactive oxygen species (ROS)-induced mitochondrial damage aggravates oxidative stress and activates mitochondrial apoptosis pathway to mediate melanocyte death. However, the repair mechanisms underlying damaged mitochondria of melanocytes remain unclear. Accumulative evidence has revealed that the aryl hydrocarbon receptor (AHR), a ligand-activated transcription factor, plays a vital role in maintaining mitochondrial homeostasis. OBJECTIVE To investigate whether the AHR signaling pathway could protect human melanocytes from oxidative damage through controlling mitochondrial quality. METHODS We constructed an oxidative stress model of melanocytes with hydrogen peroxide (H2O2) in the human normal melanocyte PIG1 cell line, and detected ROS level, apoptosis, mitochondrial ROS level, mitochondrial membrane potential, ATP production, mitochondrial DNA and mitochondrial modulators after co-treatment with AHR ligand or antagonist and H2O2 in the PIG1 cells. RESULTS In the present study, we found that H2O2-induced oxidative stress directly activated the AHR signaling pathway in melanocytes, whereas abnormal activation of AHR signaling pathway enhanced oxidative damage to mitochondria and melanocytes. Further studies showed that the AHR signaling pathway promoted mitochondrial DNA synthesis and ATP production probably by regulating the expression of nuclear respiratory factor 1 (NRF1) and its downstream targets. CONCLUSION Our findings reveal that the AHR signaling pathway might have a major role in protecting melanocytes against oxidative damage via inducing mitochondrial biogenesis, while impaired AHR activation could cause defective repair of mitochondria and exacerbate oxidative damage-induced apoptosis in melanocytes. Our data suggest that the AHR signaling pathway might be a novel mechanism of mitochondrial biogenesis involved in protecting melanocytes from oxidative stress.
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Affiliation(s)
- Xiaowen Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China; Department of Clinical Oncology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Shuli Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Ling Liu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Zhe Jian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Tingting Cui
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Yuqi Yang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Sen Guo
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Xiuli Yi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Gang Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Chunying Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China
| | - Tianwen Gao
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China.
| | - Kai Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, 127# Changlexi Road, Xi'an, Shaanxi 710032, China.
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22
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Zhang C, Creech KL, Zuercher WJ, Willson TM. Gram-scale synthesis of FICZ, a photoreactive endogenous ligand of the aryl hydrocarbon receptor. Sci Rep 2019; 9:9982. [PMID: 31292477 PMCID: PMC6620467 DOI: 10.1038/s41598-019-46374-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2019] [Accepted: 06/27/2019] [Indexed: 12/31/2022] Open
Abstract
Development of an efficient and scalable synthesis of 6-formylindolo[3,2-b]carbazole (FICZ), a naturally-occurring aryl hydrocarbon receptor (AhR) ligand, allowed its biological and physical properties to be studied. FICZ was shown to be the most potent among a series of 6-substituted indolo[3,2-b]carbazoles for activation of AhR in cells. Photostability studies of FICZ revealed a non-enzymatic mechanism for its conversion to a biologically active quinone. These results further support the hypothesis that FICZ is a light-dependent hormone that links sun exposure to regulation of biological pathways in peripheral tissues.
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Affiliation(s)
- Cunyu Zhang
- Platform Technology Sciences, GlaxoSmithKline, Collegeville, PA, USA
| | - Katrina L Creech
- Platform Technology Sciences, GlaxoSmithKline, Collegeville, PA, USA
| | - William J Zuercher
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Timothy M Willson
- Structural Genomics Consortium, UNC Eshelman School of Pharmacy, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
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23
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Bernard JJ, Gallo RL, Krutmann J. Photoimmunology: how ultraviolet radiation affects the immune system. Nat Rev Immunol 2019; 19:688-701. [PMID: 31213673 DOI: 10.1038/s41577-019-0185-9] [Citation(s) in RCA: 135] [Impact Index Per Article: 27.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/24/2019] [Indexed: 02/07/2023]
Abstract
Ultraviolet (UV) radiation is a ubiquitous component of the environment that has important effects on a wide range of cell functions. Short-wavelength UVB radiation induces sunburn and is a potent immunomodulator, yet longer-wavelength, lower-energy UVA radiation also has effects on mammalian immunity. This Review discusses current knowledge regarding the mechanisms by which UV radiation can modify innate and adaptive immune responses and how this immunomodulatory capacity can be both beneficial in the case of inflammatory and autoimmune diseases, and detrimental in the case of skin cancer and the response to several infectious agents.
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Affiliation(s)
- Jamie J Bernard
- Department of Pharmacology and Toxicology, Michigan State University, East Lansing, MI, USA. .,Division of Dermatology, Department of Medicine, Michigan State University, East Lansing, MI, USA.
| | - Richard L Gallo
- Department of Dermatology, University of California, San Diego, La Jolla, CA, USA
| | - Jean Krutmann
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.,Medical Faculty, Heinrich Heine University, Duesseldorf, Germany
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24
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Singh M, Kotnis A, Jadeja SD, Mondal A, Mansuri MS, Begum R. Cytokines: the yin and yang of vitiligo pathogenesis. Expert Rev Clin Immunol 2018; 15:177-188. [DOI: 10.1080/1744666x.2019.1550358] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Mala Singh
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India
| | - Ashwin Kotnis
- Department of Biochemistry, All India Institute of Medical Sciences, Bhopal, India
| | - Shahnawaz D. Jadeja
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India
| | - Anushree Mondal
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India
| | - Mohmmad S. Mansuri
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India
| | - Rasheedunnisa Begum
- Department of Biochemistry, Faculty of Science, The Maharaja Sayajirao University of Baroda, Vadodara, India
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25
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Janosik T, Rannug A, Rannug U, Wahlström N, Slätt J, Bergman J. Chemistry and Properties of Indolocarbazoles. Chem Rev 2018; 118:9058-9128. [PMID: 30191712 DOI: 10.1021/acs.chemrev.8b00186] [Citation(s) in RCA: 88] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The indolocarbazoles are an important class of nitrogen heterocycles which has evolved significantly in recent years, with numerous studies focusing on their diverse biological effects, or targeting new materials with potential applications in organic electronics. This review aims at providing a broad survey of the chemistry and properties of indolocarbazoles from an interdisciplinary point of view, with particular emphasis on practical synthetic aspects, as well as certain topics which have not been previously accounted for in detail, such as the occurrence, formation, biological activities, and metabolism of indolo[3,2- b]carbazoles. The literature of the past decade forms the basis of the text, which is further supplemented with older key references.
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Affiliation(s)
- Tomasz Janosik
- Research Institutes of Sweden , Bioscience and Materials, RISE Surface, Process and Formulation , SE-151 36 Södertälje , Sweden
| | - Agneta Rannug
- Institute of Environmental Medicine , Karolinska Institutet , SE-171 77 Stockholm , Sweden
| | - Ulf Rannug
- Department of Molecular Biosciences, The Wenner-Gren Institute , Stockholm University , SE-106 91 Stockholm , Sweden
| | | | - Johnny Slätt
- Department of Chemistry, Applied Physical Chemistry , KTH Royal Institute of Technology , SE-100 44 Stockholm , Sweden
| | - Jan Bergman
- Karolinska Institutet , Department of Biosciences and Nutrition , SE-141 83 Huddinge , Sweden
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Aryl hydrocarbon receptor (AhR) a possible target for the treatment of skin disease. Med Hypotheses 2018; 116:96-100. [PMID: 29857917 DOI: 10.1016/j.mehy.2018.05.001] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2018] [Revised: 04/21/2018] [Accepted: 05/07/2018] [Indexed: 01/03/2023]
Abstract
Aryl hydrocarbon receptor (AhR) is a transcription factor expressed in all skin cells type. It responds to exogenous and endogenous chemicals by inducing/repressing the expression of several genes with toxic or protective effects in a wide range of species and tissues. In healthy skin, AhR signalling contributes to keratinocytes differentiation, skin barrier function, skin pigmentation, and mediates oxidative stress. In the last years, some studies have shown that AhR seems to be involved in the pathogenesis of some skin diseases, even if the currently available data are contradictory. Indeed, while the blocking the AhR signalling activity could prevent or treat skin cancer, the AhR activation seems to be advantageous for the treatment of inflammatory skin diseases. Therefore, for its multifaceted role in skin diseases, AhR seems to be an attractive therapeutic target. Indeed, recently some molecules have been identified for the prevention of skin cancer and the treatment of inflammatory skin diseases.
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Behfarjam F, Jadali Z. Vitiligo patients show significant up-regulation of aryl hydrocarbon receptor transcription factor. An Bras Dermatol 2018; 93:302-303. [PMID: 29723348 PMCID: PMC5916416 DOI: 10.1590/abd1806-4841.20187183] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 07/09/2017] [Indexed: 11/21/2022] Open
Abstract
IL-22 has been implicated in the pathogenesis of vitiligo. However, the role of aryl hydrocarbon receptor transcription factor that acts as a master regulator of IL-22-producing Th22 cells is not fully understood. The goal of this study was to investigate the expression pattern of aryl hydrocarbon receptor in peripheral blood mononuclear cells of patients with vitiligo and in normal controls. Transcript levels were determined by a reverse transcription quantitative real-time polymerase chain reaction. Aryl hydrocarbon receptor mRNA expression was drastically increased in patients with vitiligo compared to healthy controls (P = 0.000). Th22 cells may contribute to abnormal immune responses underlying vitiligo.
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Affiliation(s)
- Farinaze Behfarjam
- Clinical Genetics Department, National Institute of Genetic
Engineering and Biotechnology Tehran, Iran
| | - Zohreh Jadali
- Department of Immunology, School of Public Health, Tehran
University of Medical Sciences, Tehran, Iran
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28
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Rekik R, Ben Hmid A, Lajnef C, Zamali I, Zaraa I, Ben Ahmed M. Aryl hydrocarbon receptor (AhR) transcription is decreased in skin of vitiligo patients. Int J Dermatol 2017; 56:1509-1512. [PMID: 28960282 DOI: 10.1111/ijd.13761] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 07/07/2017] [Accepted: 08/22/2017] [Indexed: 01/13/2023]
Affiliation(s)
- Raja Rekik
- Laboratory of Transmission, Control and Immunobiology of Infection, LR11IPT02, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Ahlem Ben Hmid
- Laboratory of Clinical Immunology, Institut Pasteur de Tunis, Tunis, Tunisia
- Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisia
| | - Chayma Lajnef
- Laboratory of Clinical Immunology, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Imen Zamali
- Laboratory of Clinical Immunology, Institut Pasteur de Tunis, Tunis, Tunisia
| | - Ines Zaraa
- Department of Dermatology, La Rabta Hospital, Tunis, Tunisia
| | - Mélika Ben Ahmed
- Laboratory of Transmission, Control and Immunobiology of Infection, LR11IPT02, Institut Pasteur de Tunis, Tunis, Tunisia
- Laboratory of Clinical Immunology, Institut Pasteur de Tunis, Tunis, Tunisia
- Université de Tunis El Manar, Faculté de Médecine de Tunis, Tunis, Tunisia
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29
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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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30
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Bousnane NEH, May S, Yahia M, Abu Alhaija AA. Association of CAT–262C/T with the concentration of catalase in seminal plasma and the risk for male infertility in Algeria. Syst Biol Reprod Med 2017; 63:303-310. [DOI: 10.1080/19396368.2017.1318187] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Nour El Houda Bousnane
- Laboratory of Bioactive Molecules and Cellular Pathophysiology, Faculty of Natural and Life Sciences, Department of Biology of Organisms, Batna University, Algeria
| | - Sadiq May
- Faculty of Sciences, Department of Biological Sciences, Yarmouk University, Irbid, Jordan
| | - Mouloud Yahia
- Laboratory of Bioactive Molecules and Cellular Pathophysiology, Faculty of Natural and Life Sciences, Department of Biology of Organisms, Batna University, Algeria
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31
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Fusco DN, Pratt H, Kandilas S, Cheon SSY, Lin W, Cronkite DA, Basavappa M, Jeffrey KL, Anselmo A, Sadreyev R, Yapp C, Shi X, O'Sullivan JF, Gerszten RE, Tomaru T, Yoshino S, Satoh T, Chung RT. HELZ2 Is an IFN Effector Mediating Suppression of Dengue Virus. Front Microbiol 2017; 8:240. [PMID: 28265266 PMCID: PMC5316548 DOI: 10.3389/fmicb.2017.00240] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2016] [Accepted: 02/03/2017] [Indexed: 01/07/2023] Open
Abstract
Flaviviral infections including dengue virus are an increasing clinical problem worldwide. Dengue infection triggers host production of the type 1 IFN, IFN alpha, one of the strongest and broadest acting antivirals known. However, dengue virus subverts host IFN signaling at early steps of IFN signal transduction. This subversion allows unbridled viral replication which subsequently triggers ongoing production of IFN which, again, is subverted. Identification of downstream IFN antiviral effectors will provide targets which could be activated to restore broad acting antiviral activity, stopping the signal to produce endogenous IFN at toxic levels. To this end, we performed a targeted functional genomic screen for IFN antiviral effector genes (IEGs), identifying 56 IEGs required for antiviral effects of IFN against fully infectious dengue virus. Dengue IEGs were enriched for genes encoding nuclear receptor interacting proteins, including HELZ2, MAP2K4, SLC27A2, HSP90AA1, and HSP90AB1. We focused on HELZ2 (Helicase With Zinc Finger 2), an IFN stimulated gene and IEG which encodes a promiscuous nuclear factor coactivator that exists in two isoforms. The two unique HELZ2 isoforms are both IFN responsive, contain ISRE elements, and gene products increase in the nucleus upon IFN stimulation. Chromatin immunoprecipitation-sequencing revealed that the HELZ2 complex interacts with triglyceride-regulator LMF1. Mass spectrometry revealed that HELZ2 knockdown cells are depleted of triglyceride subsets. We thus sought to determine whether HELZ2 interacts with a nuclear receptor known to regulate immune response and lipid metabolism, AHR, and identified HELZ2:AHR interactions via co-immunoprecipitation, found that AHR is a dengue IEG, and that an AHR ligand, FICZ, exhibits anti-dengue activity. Primary bone marrow derived macrophages from HELZ2 knockout mice, compared to wild type controls, exhibit enhanced dengue infectivity. Overall, these findings reveal that IFN antiviral response is mediated by HELZ2 transcriptional upregulation, enrichment of HELZ2 protein levels in the nucleus, and activation of a transcriptional program that appears to modulate intracellular lipid state. IEGs identified in this study may serve as both (1) potential targets for host directed antiviral design, downstream of the common flaviviral subversion point, as well as (2) possible biomarkers, whose variation, natural, or iatrogenic, could affect host response to viral infections.
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Affiliation(s)
- Dahlene N. Fusco
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
- Division of Infectious Diseases, Vaccine and Immunotherapy Center, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
- Laboratory for Systems Pharmacology, Harvard Medical SchoolBoston, MA, USA
| | - Henry Pratt
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Stephen Kandilas
- Division of Infectious Diseases, Vaccine and Immunotherapy Center, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
- Department of Medicine, Athens University Medical SchoolAthens, Greece
| | | | - Wenyu Lin
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - D. Alex Cronkite
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Megha Basavappa
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Kate L. Jeffrey
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Anthony Anselmo
- Department of Molecular Biology, Massachusetts General HospitalBoston, MA, USA
| | - Ruslan Sadreyev
- Department of Molecular Biology, Massachusetts General HospitalBoston, MA, USA
| | - Clarence Yapp
- Laboratory for Systems Pharmacology, Harvard Medical SchoolBoston, MA, USA
| | - Xu Shi
- Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical CenterBoston, MA, USA
| | - John F. O'Sullivan
- Division of Cardiology, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Robert E. Gerszten
- Division of Cardiology, Department of Medicine, Beth Israel Deaconess Medical CenterBoston, MA, USA
- Division of Cardiology, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
| | - Takuya Tomaru
- Department of Medicine and Molecular Science, Gunma University Graduate School of MedicineMaebashi, Japan
| | - Satoshi Yoshino
- Department of Medicine and Molecular Science, Gunma University Graduate School of MedicineMaebashi, Japan
| | - Tetsurou Satoh
- Department of Medicine and Molecular Science, Gunma University Graduate School of MedicineMaebashi, Japan
| | - Raymond T. Chung
- Gastrointestinal Division, Department of Medicine, Massachusetts General HospitalBoston, MA, USA
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32
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Boniface K, Seneschal J, Taïeb A, Merched A. Vitiligo therapy: restoring immune privilege? Exp Dermatol 2017; 26:635-636. [PMID: 27314920 DOI: 10.1111/exd.13128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2016] [Indexed: 12/11/2022]
Abstract
The therapeutic hypothesis proposed by Speeckaert and van Geel in this issue (1) is based on the dramatic effects of the new drugs targeting immune privilege checkpoints (PD1/PDL, CTLA4) in current advanced melanoma therapy as major inductors of vitiligo changes in the skin. Such striking clinical manifestations cannot be classified as mere side effects without considering possible consequences for spontaneously occurring vitiligo."
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Affiliation(s)
- Katia Boniface
- INSERM U 1035, BMGIC, University of Bordeaux, Bordeaux, France
| | - Julien Seneschal
- INSERM U 1035, BMGIC, University of Bordeaux, Bordeaux, France.,National Reference Centre for Rare Skin Disorders, Department of Dermatology and Pediatric Dermatology, Bordeaux University Hospitals, Bordeaux, France
| | - Alain Taïeb
- INSERM U 1035, BMGIC, University of Bordeaux, Bordeaux, France.,National Reference Centre for Rare Skin Disorders, Department of Dermatology and Pediatric Dermatology, Bordeaux University Hospitals, Bordeaux, France
| | - Aksam Merched
- INSERM U1053, Bordeaux Research in Translational Oncology, University of Bordeaux, Bordeaux, France
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33
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Speeckaert R, van Geel N. Targeting CTLA-4, PD-L1 and IDO to modulate immune responses in vitiligo. Exp Dermatol 2016; 26:630-634. [PMID: 27192950 DOI: 10.1111/exd.13069] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/06/2016] [Indexed: 01/07/2023]
Abstract
For decades, an extensive debate is continued on the pathophysiology of vitiligo. Numerous hypotheses have been put forward, and many supported by well-documented arguments. Regardless of the initiating steps, most experts agree that an immune-based melanocyte destruction is responsible for the final steps leading to epidermal depigmentation. It is remarkable that currently the only therapeutic approach to counter this phenomenon consists of non-specific local and systemic immunosuppressants. Immunotherapy for melanoma reveals that targeting factors involved in peripheral tolerance are sufficient to break the natural defense mechanisms to develop skin depigmentations. Therapeutically enhancing these immune checkpoints seems therefore a promising long-term therapy for vitiligo. In this viewpoint, we propose this strategy as a promising therapeutic option for vitiligo. Several approaches are proposed with a focus on cytotoxic T-lymphocyte-associated protein 4, programmed death ligand-1 and indoleamine 2,3-dioxygenase.
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Affiliation(s)
| | - Nanja van Geel
- Department of Dermatology, Ghent University Hospital, Ghent, Belgium
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34
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Smirnova A, Wincent E, Vikström Bergander L, Alsberg T, Bergman J, Rannug A, Rannug U. Evidence for New Light-Independent Pathways for Generation of the Endogenous Aryl Hydrocarbon Receptor Agonist FICZ. Chem Res Toxicol 2015; 29:75-86. [PMID: 26686552 DOI: 10.1021/acs.chemrestox.5b00416] [Citation(s) in RCA: 329] [Impact Index Per Article: 36.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Activation of the aryl hydrocarbon receptor (AhR), a conserved transcription factor best known as a target for highly toxic halogenated substances such as dioxin, under normal xenobiotic-free conditions is of considerable scientific interest. We have demonstrated previously that a photoproduct of tryptophan, 6-formylindolo[3,2-b]carbazole (FICZ), fulfills the criteria for an endogenous ligand for this receptor and proposed that this compound is the enigmatic mediator of the physiological functions of AhR. Here, we describe novel light-independent pathways by which FICZ can be formed. The oxidant H2O2 was shown to convert tryptophan to FICZ on its own in the absence of light. The enzymatic deamination of tryptamine yielded indole-3-acetaldehyde (I3A), which then rearranged to FICZ and its oxidation product, indolo[3,2-b]carbazole-6-carboxylic acid (CICZ). Indole-3-pyruvate (I3P) also produced I3A, FICZ, and CICZ. Malassezia yeast species, which constitute a part of the normal skin microbiota, produce a number of AhR activators from tryptophan. We identified both FICZ and CICZ among those products. Formation of FICZ from tryptophan or I3P produces a complex mixture of indole derivatives, some of which are CYP1A1 inhibitors. These can hinder the cellular clearance of FICZ and thereby increase its power as an AhR agonist. We present a general molecular mechanism involving dehydrogenations and oxidative coupling for the formation of FICZ in which I3A is the important precursor. In conclusion, our results suggest that FICZ is likely to be formed systemically.
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Affiliation(s)
| | - Emma Wincent
- Institute of Environmental Medicine, Karolinska Institutet , SE-171 77 Stockholm, Sweden
| | | | | | - Jan Bergman
- Department of Biosciences at Novum, Karolinska Institutet , SE-141 57 Huddinge, Sweden
| | - Agneta Rannug
- Institute of Environmental Medicine, Karolinska Institutet , SE-171 77 Stockholm, Sweden
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35
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Esser C, Rannug A. The aryl hydrocarbon receptor in barrier organ physiology, immunology, and toxicology. Pharmacol Rev 2015; 67:259-79. [PMID: 25657351 DOI: 10.1124/pr.114.009001] [Citation(s) in RCA: 351] [Impact Index Per Article: 39.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
The aryl hydrocarbon receptor (AhR) is an evolutionarily old transcription factor belonging to the Per-ARNT-Sim-basic helix-loop-helix protein family. AhR translocates into the nucleus upon binding of various small molecules into the pocket of its single-ligand binding domain. AhR binding to both xenobiotic and endogenous ligands results in highly cell-specific transcriptome changes and in changes in cellular functions. We discuss here the role of AhR for immune cells of the barrier organs: skin, gut, and lung. Both adaptive and innate immune cells require AhR signaling at critical checkpoints. We also discuss the current two prevailing views-namely, 1) AhR as a promiscuous sensor for small chemicals and 2) a role for AhR as a balancing factor for cell differentiation and function, which is controlled by levels of endogenous high-affinity ligands. AhR signaling is considered a promising drug and preventive target, particularly for cancer, inflammatory, and autoimmune diseases. Therefore, understanding its biology is of great importance.
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Affiliation(s)
- Charlotte Esser
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany (C.E.); and Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden (A.R.)
| | - Agneta Rannug
- Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany (C.E.); and Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden (A.R.)
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36
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Wang X, Li K, Liu L, Shi Q, Song P, Jian Z, Guo S, Wang G, Li C, Gao T. AHR promoter variant modulates its transcription and downstream effectors by allele-specific AHR-SP1 interaction functioning as a genetic marker for vitiligo. Sci Rep 2015; 5:13542. [PMID: 26370050 PMCID: PMC4570213 DOI: 10.1038/srep13542] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2015] [Accepted: 07/30/2015] [Indexed: 12/28/2022] Open
Abstract
Vitiligo is an acquired depigmentation disorder largely caused by defective melanocyte- or autoimmunity-induced melanocyte destruction. The aryl hydrocarbon receptor (AHR) is essential for melanocyte homeostasis and immune process, and abnormal AHR was observed in vitiligo. We previously identified the T allele of AHR -129C > T variant as a protective factor against vitiligo. However, biological characterization underlying such effects is not fully certain, further validation by mechanistic research is warranted and was conducted in the present study. We showed that -129T allele promoted AHR transcriptional activity through facilitating its interaction with SP1 transcription factor (SP1) compared with -129C allele. We subsequently found reduced peripheral AHR and SP1 transcript expressions in vitiligo and a negative correlation of AHR level with disease duration. We also investigated AHR-related cytokines and observed increased serum TNF-α concentration and diminished serum levels of IL-10 and TGF-β1 in vitiligo. Further genetic analysis showed that -129T carriers possessed higher levels of AHR and IL-10 than -129C carriers. Therefore, our study indicates that the modulation of AHR transcription by a promoter variant has a profound influence on vitiligo, not only advancing our understanding on AHR function but also providing novel insight into the pathogenesis of degenerative or autoimmune diseases including vitiligo.
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Affiliation(s)
- Xiaowen Wang
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Kai Li
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Ling Liu
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Qiong Shi
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Pu Song
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Zhe Jian
- Department of Dermatology, Xijing Hospital, Fourth Military Medical University, Xi’an, Shaanxi, China
| | - Sen Guo
- 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
| | - Chunying Li
- 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
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37
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Picardo M, Bastonini E. A New View of Vitiligo: Looking at Normal-Appearing Skin. J Invest Dermatol 2015; 135:1713-1714. [PMID: 26066890 DOI: 10.1038/jid.2015.92] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
Debate over the pathogenesis of vitiligo is still ongoing among scientists, with several hypotheses currently under consideration. The study by Wagner et al. in this issue focuses on the role of E-cadherin-mediated cell adhesion in vitiliginous epidermis under oxidative and mechanical stress. Their work highlights how alterations in cell-cell adhesion across nonlesional melanocyte membranes in patients with vitiligo argue for primary intrinsic defects in the melanocytes.
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Affiliation(s)
- Mauro Picardo
- Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy.
| | - Emanuela Bastonini
- Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
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38
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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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39
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Haarmann-Stemmann T, Esser C, Krutmann J. The Janus-Faced Role of Aryl Hydrocarbon Receptor Signaling in the Skin: Consequences for Prevention and Treatment of Skin Disorders. J Invest Dermatol 2015; 135:2572-2576. [PMID: 26269144 DOI: 10.1038/jid.2015.285] [Citation(s) in RCA: 83] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 06/21/2015] [Accepted: 06/30/2015] [Indexed: 12/16/2022]
Abstract
The aryl hydrocarbon receptor (AHR) is a ligand-activated transcription factor expressed in all skin cell types, which is critically involved in the pathogenesis of a variety of skin diseases and thus represents a potential therapeutic target. Recent studies indicate that blocking AHR activation is desirable in some skin conditions, whereas the opposite, i.e., stimulation of AHR activation, is beneficial in another group of skin disorders. We here propose a model based on qualitative differences in canonical versus non-canonical AHR signaling to reconcile these seemingly contradictory observations.
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Affiliation(s)
| | - Charlotte Esser
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Jean Krutmann
- IUF - Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany; Medical Faculty, Heinrich-Heine-University, Düsseldorf, Germany.
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40
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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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41
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Li P, Ma H, Han D, Mou K. Interleukin-33 affects cytokine production by keratinocytes in vitiligo. Clin Exp Dermatol 2014; 40:163-70. [PMID: 25251808 DOI: 10.1111/ced.12464] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/03/2014] [Indexed: 11/29/2022]
Affiliation(s)
- P. Li
- Center for Translational Medicine; College of Medicine; First Affiliated Hospital Xi'an Jiaotong University; Xi'an China
| | - H. Ma
- Department of Dermatology; College of Medicine; First Affiliated Hospital Xi'an Jiaotong University; Xi'an China
| | - D. Han
- Department of Dermatology; College of Medicine; First Affiliated Hospital Xi'an Jiaotong University; Xi'an China
| | - K. Mou
- Department of Dermatology; College of Medicine; First Affiliated Hospital Xi'an Jiaotong University; Xi'an China
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42
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Role of AhR/ARNT system in skin homeostasis. Arch Dermatol Res 2014; 306:769-79. [PMID: 24966027 PMCID: PMC4220966 DOI: 10.1007/s00403-014-1481-7] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2014] [Revised: 04/27/2014] [Accepted: 05/22/2014] [Indexed: 11/04/2022]
Abstract
Aryl hydrocarbon receptor (AhR) is a ligand-dependent transcription factor that binds to structurally diverse synthetic and naturally occurring chemicals including dioxins, flavonoids, tryptophan photoproducts, and Malassezia metabolites. Upon binding to its ligands, cytoplasmic AhR translocates to the nucleus, heterodimerizes with aryl hydrocarbon receptor nuclear translocator (ARNT), and mediates numerous biological and toxicological effects by inducing the transcription of various AhR-responsive genes. AhR ligation controls oxidation/antioxidation, epidermal barrier function, photo-induced response, melanogenesis, and innate immunity. This review summarizes recent advances in the understanding of the regulatory mechanisms of skin homeostasis mediated by the AhR/ARNT system.
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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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44
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McElwee KJ, Gilhar A, Tobin DJ, Ramot Y, Sundberg JP, Nakamura M, Bertolini M, Inui S, Tokura Y, Jr LEK, Duque-Estrada B, Tosti A, Keren A, Itami S, Shoenfeld Y, Zlotogorski A, Paus R. What causes alopecia areata? Exp Dermatol 2013; 22:609-26. [PMID: 23947678 PMCID: PMC4094373 DOI: 10.1111/exd.12209] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The pathobiology of alopecia areata (AA), one of the most frequent autoimmune diseases and a major unsolved clinical problem, has intrigued dermatologists, hair biologists and immunologists for decades. Simultaneously, both affected patients and the physicians who take care of them are increasingly frustrated that there is still no fully satisfactory treatment. Much of this frustration results from the fact that the pathobiology of AA remains unclear, and no single AA pathogenesis concept can claim to be universally accepted. In fact, some investigators still harbour doubts whether this even is an autoimmune disease, and the relative importance of CD8(+) T cells, CD4(+) T cells and NKGD2(+) NK or NKT cells and the exact role of genetic factors in AA pathogenesis remain bones of contention. Also, is AA one disease, a spectrum of distinct disease entities or only a response pattern of normal hair follicles to immunologically mediated damage? During the past decade, substantial progress has been made in basic AA-related research, in the development of new models for translationally relevant AA research and in the identification of new therapeutic agents and targets for future AA management. This calls for a re-evaluation and public debate of currently prevalent AA pathobiology concepts. The present Controversies feature takes on this challenge, hoping to attract more skin biologists, immunologists and professional autoimmunity experts to this biologically fascinating and clinically important model disease.
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Affiliation(s)
- K. J. McElwee
- Department of Dermatology and Skin Science, University of British Columbia, Vancouver, BC, Canada
| | - A. Gilhar
- Laboratory for Skin, Research, Rappaport Faculty of Medicine, Technion–Israel Institute of Technology, Haifa, Israel Marta Bertolini
| | - D. J. Tobin
- Centre for Skin Sciences, School of Life Sciences, University of Bradford, Bradford, West Yorkshire, BD7 1DP, UK
| | - Y. Ramot
- Department of Dermatology, Hadassah- Hebrew University Medical Center, Jerusalem 91120, Israel
| | - J. P. Sundberg
- The Jackson Laboratory, Bar Harbor, ME, USA; Division of Dermatology, Skin Disease Research Center, Vanderbilt University, Nashville, TN, USA
| | - M. Nakamura
- Department of Dermatology, University of Occupational and Environmental Health, Kitakyushu, Japan Yoshiki Tokura
| | - M. Bertolini
- Department of Dermatology, University of Lübeck, Germany Yehuda Shoenfeld
| | - S. Inui
- Department of Regenerative Dermatology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Y. Tokura
- Department of Dermatology, Hamamatsu University School of Medicine, Hamamatsu, Japan
| | - L. E. King Jr
- The Jackson Laboratory, Bar Harbor, ME, USA; Division of Dermatology, Skin Disease Research Center, Vanderbilt University, Nashville, TN, USA
| | - B. Duque-Estrada
- Instituto de Dermatologia Prof. Rubem David Azulay, Rio de Janeiro, Brazil Antonella Tosti
| | - A Tosti
- Department of Dermatology, University of Miami, Miami, FL, USA
| | - A. Keren
- Laboratory for Skin, Research, Rappaport Faculty of Medicine, Technion–Israel Institute of Technology, Haifa, Israel Marta Bertolini
| | - S. Itami
- Department of Regenerative Dermatology, Graduate School of Medicine, Osaka University, Suita, Osaka, Japan
| | - Y. Shoenfeld
- Center for Autoimmune Diseases, Sheba Medical Center, Tel Hashomer and Sackler Faculty of Medicine, Tel Aviv University, Ramat Aviv, Israel
| | - A. Zlotogorski
- Department of Dermatology, Hadassah- Hebrew University Medical Center, Jerusalem 91120, Israel
| | - R. Paus
- Department of Dermatology, University of Lübeck, Germany; Institute of Inflammation and Repair, University of Manchester, Manchester, UK ,
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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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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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Profiling mRNA of the graying human hair follicle constitutes a promising state-of-the-art tool to assess its aging: an exemplary report. J Invest Dermatol 2012; 133:1150-60. [PMID: 23235529 DOI: 10.1038/jid.2012.462] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
Determining hitherto uninvestigated and safe targets to halt the aging process is important in our aging society. Graying is a hallmark of the aging process and may be used to identify aging tissue for comparative analysis. Here we analyzed differential gene expressions between pigmented, gray, and white human scalp skin hair follicles (HFs) from identical donors. Forming intersections between five donors identified 194/192 downregulated and 186/177 upregulated genes in gray/white HFs. These included melanogenesis (tyrosinase; tyrosinase-related protein 1)- and melanosome structure (Melan-A; Pmel17)-associated genes and regulation of melanocyte relevant tyrosine kinases. Alongside these expected changes, regulated genes included nonmelanocyte-related genes associated with aging as well as nonaging-related genes associated with melanocytes. Intriguingly, among them, genes associated with energy metabolism (i.e., glutaminase) and axon guidance (plexin C1) were altered. These results were reflected by pathway analysis and exemplarily confirmed by PCR and immunohistochemical studies. Supplementing cultured HFs with glutamine or plexin C1 revealed biological relevance and pharmacointerventional potential of these microarray results in altering the HF aging process. Together, we present intriguing data obtained from intra-individual sample comparison that suggest the graying HF to be a valid aging model and a promising target for testing therapeutic interventions.
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