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Carvajal RD, Sacco JJ, Jager MJ, Eschelman DJ, Olofsson Bagge R, Harbour JW, Chieng ND, Patel SP, Joshua AM, Piperno-Neumann S. Advances in the clinical management of uveal melanoma. Nat Rev Clin Oncol 2023; 20:99-115. [PMID: 36600005 DOI: 10.1038/s41571-022-00714-1] [Citation(s) in RCA: 54] [Impact Index Per Article: 54.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/16/2022] [Indexed: 01/05/2023]
Abstract
Melanomas arising in the uveal tract of the eye are a rare form of the disease with a biology and clinical phenotype distinct from their more common cutaneous counterparts. Treatment of primary uveal melanoma with radiotherapy, enucleation or other modalities achieves local control in more than 90% of patients, although 40% or more ultimately develop distant metastases, most commonly in the liver. Until January 2022, no systemic therapy had received regulatory approval for patients with metastatic uveal melanoma, and these patients have historically had a dismal prognosis owing to the limited efficacy of the available treatments. A series of seminal studies over the past two decades have identified highly prevalent early, tumour-initiating oncogenic genomic aberrations, later recurring prognostic alterations and immunological features that characterize uveal melanoma. These advances have driven the development of a number of novel emerging treatments, including tebentafusp, the first systemic therapy to achieve regulatory approval for this disease. In this Review, our multidisciplinary and international group of authors summarize the biology of uveal melanoma, management of primary disease and surveillance strategies to detect recurrent disease, and then focus on the current standard and emerging regional and systemic treatment approaches for metastatic uveal melanoma.
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Affiliation(s)
- Richard D Carvajal
- Department of Medicine, Columbia University Irving Medical Center, New York, NY, USA.
| | - Joseph J Sacco
- Institute of Systems, Molecular and Integrative Biology, University of Liverpool, Liverpool, UK
| | - Martine J Jager
- Department of Ophthalmology, Leiden University Medical Center, Leiden, The Netherlands
| | - David J Eschelman
- Department of Radiology, Thomas Jefferson University, Philadelphia, PA, USA
| | | | - J William Harbour
- Department of Ophthalmology and Simmons Comprehensive Cancer Center, UT Southwestern Medical Center, Dallas, TX, USA
| | - Nicholas D Chieng
- Medical Imaging Services, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Sapna P Patel
- Department of Melanoma Medical Oncology, MD Anderson Cancer Center, Houston, TX, USA
| | - Anthony M Joshua
- Department of Medical Oncology, Kinghorn Cancer Centre, St Vincent's Hospital Sydney and Garvan Institute of Medical Research, Sydney, New South Wales, Australia.,School of Clinical Medicine, UNSW Medicine & Health, St Vincent's Healthcare Clinical Campus, Faculty of Medicine and Health, UNSW, Sydney, New South Wales, Australia
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Guida S, Guida G, Goding CR. MC1R Functions, Expression, and Implications for Targeted Therapy. J Invest Dermatol 2021; 142:293-302.e1. [PMID: 34362555 DOI: 10.1016/j.jid.2021.06.018] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Revised: 06/14/2021] [Accepted: 06/17/2021] [Indexed: 12/23/2022]
Abstract
The G protein-coupled MC1R is expressed in melanocytes and has a pivotal role in human skin pigmentation, with reduced function in human genetic variants exhibiting a red hair phenotype and increased melanoma predisposition. Beyond its role in pigmentation, MC1R is increasingly recognized as promoting UV-induced DNA damage repair. Consequently, there is mounting interest in targeting MC1R for therapeutic benefit. However, whether MC1R expression is restricted to melanocytes or is more widely expressed remains a matter of debate. In this paper, we review MC1R function and highlight that unbiased analysis suggests that its expression is restricted to melanocytes, granulocytes, and the brain.
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Affiliation(s)
- Stefania Guida
- Dermatology Unit, Surgical, Medical and Dental Department of Morphological Sciences Related to Transplant, Oncological and Regenerative Medicine, University of Modena and Reggio Emilia, Modena, Italy.
| | - Gabriella Guida
- Molecular Biology Section, Department of Basic Medical Sciences, Neurosciences and Sense Organs, University of Bari Aldo Moro, Bari, Italy
| | - Colin Ronald Goding
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford, United Kingdom
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3
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Santiago JL, Muñoz-Rodriguez JR, de la Cruz-Morcillo MA, Villar-Rodriguez C, Gonzalez-Lopez L, Aguado C, Nuncia-Cantarero M, Redondo-Calvo FJ, Perez-Ortiz JM, Galan-Moya EM. Characterization of Permeability Barrier Dysfunction in a Murine Model of Cutaneous Field Cancerization Following Chronic UV-B Irradiation: Implications for the Pathogenesis of Skin Cancer. Cancers (Basel) 2021; 13:cancers13163935. [PMID: 34439089 PMCID: PMC8394893 DOI: 10.3390/cancers13163935] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Accepted: 08/02/2021] [Indexed: 01/17/2023] Open
Abstract
Simple Summary In the present work, we developed an experimental preclinical model of skin with cutaneous field cancerization after chronic UV-B light exposure in an immunologically intact mouse model (SKH1 aged mice). We observed impairments in the transepidermal water loss, stratum corneum hydration, and surface pH. We also detected a marked hyperkeratotic hyperplasia of the epidermis, induction of keratinocyte hyperproliferation, incidental actinic keratosis, and in situ squamous cell carcinomas in the UV-B light-irradiated groups. In this context, the association between the permeability barrier impairment and keratinocyte hyperproliferation might be considered a new target in the management of skin with cutaneous field cancerization. As current therapeutic approaches to actinic keratosis and cutaneous field cancerization only focus on the direct antineoplastic, immunomodulatory, or photodynamic effects of approved topical drugs, this mouse model of skin with cutaneous field cancerization might be helpful for both the identification and screening of potentially new preventive strategies or treatments (e.g., skin barrier therapies). Abstract Chronic ultraviolet B (UV-B) irradiation is known to be one of the most important hazards acting on the skin and poses a risk of developing photoaging, skin with cutaneous field cancerization (CFC), actinic keratosis (AKs), and squamous cell carcinomas (SCCs). Most of the UV-B light is absorbed in the epidermis, affecting the outermost cell layers, the stratum corneum, and the stratum granulosum, which protects against this radiation and tries to maintain the permeability barrier. In the present work, we show an impairment in the transepidermal water loss, stratum corneum hydration, and surface pH after chronic UV-B light exposure in an immunologically intact mouse model (SKH1 aged mice) of skin with CFC. Macroscopic lesions of AKs and SCCs may develop synchronically or over time on the same cutaneous surface due to both the presence of subclinical AKs and in situ SCC, but also the accumulation of different mutations in keratinocytes. Focusing on skin with CFC, yet without the pathological criteria of AKs or SCC, the presence of p53 immunopositive patches (PIPs) within the epidermis is associated with these UV-B-induced mutations. Reactive epidermis to chronic UV-B exposure correlated with a marked hyperkeratotic hyperplasia, hypergranulosis, and induction of keratinocyte hyperproliferation, while expressing an upregulation of filaggrin, loricrin, and involucrin immunostaining. However, incidental AKs and in situ SCC might show neither hypergranulosis nor upregulation of differentiation markers in the upper epidermis. Despite the overexpression of filaggrin, loricrin, involucrin, lipid enzymes, and ATP-binding cassette subfamily A member 12 (ABCA12) after chronic UV-B irradiation, the permeability barrier, stratum corneum hydration, and surface pH were severely compromised in the skin with CFC. We interpret these results as an attempt to restore the permeability barrier homeostasis by the reactive epidermis, which fails due to ultrastructural losses in stratum corneum integrity, higher pH on skin surface, abundant mast cells in the dermis, and the common presence of incidental AKs and in situ SCC. As far as we know, this is the first time that the permeability barrier has been studied in the skin with CFC in a murine model of SCC induced after chronic UV-B irradiation at high doses. The impairment in the permeability barrier and the consequent keratinocyte hyperproliferation in the skin of CFC might play a role in the physiopathology of AKs and SCCs.
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Affiliation(s)
- Juan Luis Santiago
- Department of Dermatology, University General Hospital, 13004 Ciudad Real, Spain;
- Translational Research Unit, University General Hospital, 13004 Ciudad Real, Spain; (J.R.M.-R.); (M.A.d.l.C.-M.); (C.V.-R.)
| | - Jose Ramon Muñoz-Rodriguez
- Translational Research Unit, University General Hospital, 13004 Ciudad Real, Spain; (J.R.M.-R.); (M.A.d.l.C.-M.); (C.V.-R.)
- Faculty of Medicine, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;
| | | | - Clara Villar-Rodriguez
- Translational Research Unit, University General Hospital, 13004 Ciudad Real, Spain; (J.R.M.-R.); (M.A.d.l.C.-M.); (C.V.-R.)
| | - Lucia Gonzalez-Lopez
- Faculty of Medicine, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;
- Department of Pathological Anatomy, University General Hospital, 13004 Ciudad Real, Spain
| | - Carolina Aguado
- Synaptic Structure Laboratory, Instituto de Investigación en Discapacidades Neurológicas (IDINE), Universidad de Castilla-La Mancha, 02008 Albacete, Spain;
| | - Miriam Nuncia-Cantarero
- Translational Oncology Laboratory, Centro Regional de Investigaciones Biomédicas (CRIB), Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (M.N.-C.); (E.M.G.-M.)
| | - Francisco Javier Redondo-Calvo
- Translational Research Unit, University General Hospital, 13004 Ciudad Real, Spain; (J.R.M.-R.); (M.A.d.l.C.-M.); (C.V.-R.)
- Faculty of Medicine, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;
- Correspondence: (F.J.R.-C.); (J.M.P.-O.); Tel.: +34-926-278-000 (J.M.P.-O.)
| | - Jose Manuel Perez-Ortiz
- Translational Research Unit, University General Hospital, 13004 Ciudad Real, Spain; (J.R.M.-R.); (M.A.d.l.C.-M.); (C.V.-R.)
- Faculty of Medicine, Universidad de Castilla-La Mancha, 13071 Ciudad Real, Spain;
- Correspondence: (F.J.R.-C.); (J.M.P.-O.); Tel.: +34-926-278-000 (J.M.P.-O.)
| | - Eva Maria Galan-Moya
- Translational Oncology Laboratory, Centro Regional de Investigaciones Biomédicas (CRIB), Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (M.N.-C.); (E.M.G.-M.)
- Faculty of Nursing, Universidad de Castilla-La Mancha, 02006 Albacete, Spain
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Cheng JB, Cho RJ. Emergence and Evolution of Mutational Hotspots in Sun-Damaged Skin. J Invest Dermatol 2019; 138:16-17. [PMID: 29273145 DOI: 10.1016/j.jid.2017.09.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2017] [Revised: 09/11/2017] [Accepted: 09/13/2017] [Indexed: 10/18/2022]
Abstract
In this issue, Albibas et al. investigate the mutational nature of p53-immunopositive patches, commonly observed in sun-damaged skin. p53-immunopositive patches have long been suspected to be lineal precursors to actinic keratoses and cutaneous squamous cell carcinomas. However, the mutations actually giving rise to p53-immunopositive patches, and their relationship to skin cancer, have never been defined. The considerable clinical and economic costs of monitoring and treating sun-damaged skin demand we better understand the evolution of these common premalignancies.
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Affiliation(s)
- Jeffrey B Cheng
- Department of Dermatology, University of California, San Francisco, California, USA; Veterans Affairs Medical Center, San Francisco, California, USA
| | - Raymond J Cho
- Department of Dermatology, University of California, San Francisco, California, USA.
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Smith DJM. The Melanocortin 1 receptor and its influence on naevi and melanoma in dark-skinned phenotypes. Australas J Dermatol 2018; 60:192-199. [PMID: 30585306 DOI: 10.1111/ajd.12982] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Accepted: 10/20/2018] [Indexed: 12/19/2022]
Abstract
It is well appreciated that melanocortin 1 receptor variants can produce a fair skinned and red-haired phenotype that has a strong association with increased melanoma risk. These patients are easily recognised and given appropriate attention. What may not be appreciated is that darker-skinned individuals may also carry melanocortin 1 receptor variant alleles and that they can also be at increased risk of melanoma. Considering that melanocortin 1 receptor is crucial for melanocyte proliferation, regulation and differentiation do the naevi of these darker-skinned individuals have specific features that help identify them as carrying one of these melanocortin 1 receptor variants and do melanomas that develop in dark-skinned melanocortin 1 receptor variant carriers have particular characteristics?
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Albibas AA, Rose-Zerilli MJ, Lai C, Pengelly RJ, Lockett GA, Theaker J, Ennis S, Holloway JW, Healy E. Subclonal Evolution of Cancer-Related Gene Mutations in p53 Immunopositive Patches in Human Skin. J Invest Dermatol 2018; 138:189-198. [DOI: 10.1016/j.jid.2017.07.844] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 07/12/2017] [Accepted: 07/25/2017] [Indexed: 11/27/2022]
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Flori E, Mastrofrancesco A, Kovacs D, Bellei B, Briganti S, Maresca V, Cardinali G, Picardo M. The activation of PPARγ by 2,4,6-Octatrienoic acid protects human keratinocytes from UVR-induced damages. Sci Rep 2017; 7:9241. [PMID: 28835664 PMCID: PMC5569026 DOI: 10.1038/s41598-017-09578-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 07/21/2017] [Indexed: 02/08/2023] Open
Abstract
Increasing attention is addressed to identify products able to enhance skin photoprotection and to prevent skin carcinogenesis. Several studies have demonstrated that the α-melanocyte stimulating hormone (αMSH), acting on a functional MC1R, provides a photoprotective effect by inducing pigmentation, antioxidants and DNA repair. We discovered a link between αMSH and the nuclear receptor Peroxisome Proliferator-Activated Receptor-γ (PPARγ), suggesting that some of the αMSH protective effects may be dependent on PPARγ transcriptional activity. Moreover, we demonstrated that the activation of PPARγ by the parrodiene 2,4,6-octatrienoic acid (Octa) induces melanogenesis and antioxidant defence in human melanocytes and counteracts senescence-like phenotype in human fibroblasts. In this study, we demonstrate that the activation of PPARγ by Octa exerts a protective effect against UVA- and UVB-induced damage on normal human keratinocytes (NHKs), the major target cells of UV radiation. Octa promotes the antioxidant defence, augments DNA repair and reduces the induction of proteins involved in UV-induced DNA damage response. Our results contribute to deepen the analysis of the αMSH/PPARγ connection and suggest perspectives for the development of new molecules and formulations able to prevent cutaneous UV damage by acting on the different skin cell populations through PPARγ activation.
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Affiliation(s)
- Enrica Flori
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Arianna Mastrofrancesco
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Daniela Kovacs
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Barbara Bellei
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Stefania Briganti
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Vittoria Maresca
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Giorgia Cardinali
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy
| | - Mauro Picardo
- Laboratory of Cutaneous Physiopathology and Integrated Center of Metabolomics Research, San Gallicano Dermatologic Institute, IRCCS, Rome, Italy.
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Lai C, Healy E. The Warthin-Starry stain for detection of cutaneous melanin: more than a historical curiosity. Exp Dermatol 2016; 25:763-4. [DOI: 10.1111/exd.13101] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/20/2016] [Indexed: 01/22/2023]
Affiliation(s)
- Chester Lai
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
| | - Eugene Healy
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
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Lai C, August S, Albibas A, Behar R, Cho SY, Polak ME, Theaker J, MacLeod AS, French RR, Glennie MJ, Al-Shamkhani A, Healy E. OX40+ Regulatory T Cells in Cutaneous Squamous Cell Carcinoma Suppress Effector T-Cell Responses and Associate with Metastatic Potential. Clin Cancer Res 2016; 22:4236-48. [PMID: 27034329 PMCID: PMC4987192 DOI: 10.1158/1078-0432.ccr-15-2614] [Citation(s) in RCA: 65] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 03/18/2016] [Indexed: 12/31/2022]
Abstract
PURPOSE Cutaneous squamous cell carcinoma (cSCC) is the most common human cancer with metastatic potential. Despite T cells accumulating around cSCCs, these tumors continue to grow and persist. To investigate reasons for failure of T cells to mount a protective response in cSCC, we focused on regulatory T cells (Tregs) as this suppressive population is well represented among the infiltrating lymphocytes. EXPERIMENTAL DESIGN Flow cytometry was conducted on cSCC lymphocytes and in vitro functional assays were performed using sorted tumoral T cells. Lymphocyte subsets in primary cSCCs were quantified immunohistochemically. RESULTS FOXP3(+) Tregs were more frequent in cSCCs than in peripheral blood (P < 0.0001, n = 86 tumors). Tumoral Tregs suppressed proliferation of tumoral effector CD4(+) (P = 0.005, n = 10 tumors) and CD8(+) T cells (P = 0.043, n = 9 tumors) and inhibited IFNγ secretion by tumoral effector T cells (P = 0.0186, n = 11 tumors). The costimulatory molecule OX40 was expressed predominantly on tumoral Tregs (P < 0.0001, n = 15 tumors) and triggering OX40 with an agonist anti-OX40 antibody overcame the suppression exerted by Tregs, leading to increased tumoral effector CD4(+) lymphocyte proliferation (P = 0.0098, n = 10 tumors). Tregs and OX40(+) lymphocytes were more abundant in primary cSCCs that metastasized than in primary cSCCs that had not metastasized (n = 48 and n = 49 tumors, respectively). CONCLUSIONS Tregs in cSCCs suppress effector T-cell responses and are associated with subsequent metastasis, suggesting a key role for Tregs in cSCC development and progression. OX40 agonism reversed the suppressive effects of Tregs in vitro, suggesting that targeting OX40 could benefit the subset of cSCC patients at high risk of metastasis. Clin Cancer Res; 22(16); 4236-48. ©2016 AACR.
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Affiliation(s)
- Chester Lai
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom. Dermatology, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Suzannah August
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom. Dermatology, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Amel Albibas
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Ramnik Behar
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Shin-Young Cho
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Marta E Polak
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Jeffrey Theaker
- Histopathology, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom
| | - Amanda S MacLeod
- Dermatology, Duke University Medical Center, Durham, North Carolina
| | - Ruth R French
- Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Martin J Glennie
- Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Aymen Al-Shamkhani
- Cancer Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom
| | - Eugene Healy
- Dermatopharmacology, Clinical and Experimental Sciences, Faculty of Medicine, University of Southampton, Southampton, United Kingdom. Dermatology, University Hospital Southampton NHS Foundation Trust, Southampton, United Kingdom.
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Elvin J, Buvall L, Lindskog Jonsson A, Granqvist A, Lassén E, Bergwall L, Nyström J, Haraldsson B. Melanocortin 1 receptor agonist protects podocytes through catalase and RhoA activation. Am J Physiol Renal Physiol 2016; 310:F846-56. [PMID: 26887829 DOI: 10.1152/ajprenal.00231.2015] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 02/15/2016] [Indexed: 11/22/2022] Open
Abstract
Drugs containing adrenocorticotropic hormone have been used as therapy for patients with nephrotic syndrome. We have previously shown that adrenocorticotropic hormone and a selective agonist for the melanocortin 1 receptor (MC1R) exert beneficial actions in experimental membranous nephropathy with reduced proteinuria, reduced oxidative stress, and improved glomerular morphology and function. Our hypothesis is that MC1R activation in podocytes elicits beneficial effects by promoting stress fibers and maintaining podocyte viability. To test the hypothesis, we cultured podocytes and used highly specific agonists for MC1R. Podocytes were subjected to the nephrotic-inducing agent puromycin aminonucleoside, and downstream effects of MC1R activation on podocyte survival, antioxidant defense, and cytoskeleton dynamics were studied. To increase the response and enhance intracellular signals, podocytes were transduced to overexpress MC1R. We showed that puromycin promotes MC1R expression in podocytes and that activation of MC1R promotes an increase of catalase activity and reduces oxidative stress, which results in the dephosphorylation of p190RhoGAP and formation of stress fibers through RhoA. In addition, MC1R agonists protect against apoptosis. Together, these mechanisms protect the podocyte against puromycin. Our findings strongly support the hypothesis that selective MC1R-activating agonists protect podocytes and may therefore be useful to treat patients with nephrotic syndromes commonly considered as podocytopathies.
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Affiliation(s)
- Johannes Elvin
- Department of Molecular and Clinical Medicine, Institute of Medicine, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden;
| | - Lisa Buvall
- Department of Physiology, Institute of Neuroscience and Physiology, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; and Department of Nephrology, Massachusetts General Hospital and Harvard Medical School, Boston, Massachusetts
| | - Annika Lindskog Jonsson
- Department of Molecular and Clinical Medicine, Institute of Medicine, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Anna Granqvist
- Department of Molecular and Clinical Medicine, Institute of Medicine, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Emelie Lassén
- Department of Molecular and Clinical Medicine, Institute of Medicine, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Lovisa Bergwall
- Department of Physiology, Institute of Neuroscience and Physiology, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; and
| | - Jenny Nyström
- Department of Physiology, Institute of Neuroscience and Physiology, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; and
| | - Börje Haraldsson
- Department of Molecular and Clinical Medicine, Institute of Medicine, the Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
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11
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Yu S, Yu HS, Tu HP, Wu CS, Lan CCE. Association study between melanocortin-1 receptor gene polymorphisms and occurrence of vitiligo in a Taiwanese population: possible explanation for lack of increased UV-related damage in vitiligo skin. J Eur Acad Dermatol Venereol 2015; 30:e204-e205. [PMID: 26670452 DOI: 10.1111/jdv.13528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- S Yu
- Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Dermatology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Graduate Institute of Clinical Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - H S Yu
- Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Dermatology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli County, Taiwan
| | - H P Tu
- Department of Public Health and Environmental Medicine, Faculty of Medicine, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - C S Wu
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - C C E Lan
- Department of Dermatology, Kaohsiung Medical University Hospital, Kaohsiung, Taiwan.,Department of Dermatology, College of Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan.,Department of Dermatology, Kaohsiung Municipal Ta-Tung Hospital, Kaohsiung, Taiwan
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12
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Abstract
PURPOSE AND DESIGN In recent years, there have been dramatic improvements in the diagnosis and treatment of patients with melanoma. The development of molecular markers and associated targeted therapies have given new hope to subsets of patients with advanced disease. Here we discuss the most important advances in molecular targeted therapy and how these developments are likely to affect the practice of the clinical surgeon. RESULTS AND CONCLUSIONS Germ-line and somatic mutations are common in melanoma and provide prognostic information that can now be harnessed to provide a more personalized approach to cancer treatment. BRAF mutation at the V600 position is the most commonly identified mutation in patients with melanoma. Treatment with targeted inhibitors in patients with BRAF-mutant melanoma has afforded dramatic responses in about half of selected patients. Unfortunately, disease control is not durable and recurrences are common. We predict an increasing role for the surgeon in the multidisciplinary treatment of patients with metastatic disease, as well as a role for molecular profiling in patients with high-risk early stage disease. Further, we are only beginning to understand the prognostic significance of various gene mutations in patients with melanoma.
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Affiliation(s)
- Danielle K DePeralta
- Division of Surgical Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA
| | - Genevieve M Boland
- Division of Surgical Oncology, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
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13
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Jablonski NG, Chaplin G. Skin cancer was not a potent selective force in the evolution of protective pigmentation in early hominins. Proc Biol Sci 2015; 281:20140517. [PMID: 24990674 DOI: 10.1098/rspb.2014.0517] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022] Open
Affiliation(s)
- Nina G Jablonski
- Department of Anthropology, The Pennsylvania State University, 409 Carpenter Building, University Park, PA 16802, USA
| | - George Chaplin
- Department of Anthropology, The Pennsylvania State University, 409 Carpenter Building, University Park, PA 16802, USA
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Yin K, Sturm RA, Smith AG. MC1R and NR4A receptors in cellular stress and DNA repair: implications for UVR protection. Exp Dermatol 2015; 23:449-52. [PMID: 24758341 DOI: 10.1111/exd.12420] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/21/2014] [Indexed: 01/03/2023]
Abstract
Ultraviolet radiation (UVR) is the most common mutagen that melanocytes are exposed to. UVR causes a diverse range of DNA photolesions contributing to genome instability and promotes melanoma and non-melanoma development. Melanocytes are pigment-producing cells that synthesise the photoprotective melanins when the melanocortin-1 receptor (MC1R) is activated. MC1R is a G-protein-coupled receptor expressed predominantly in melanocytes. Its signalling pathway has been directly linked to melanogenesis, enhanced cytoprotection against UV damage and augmented DNA repair response. Interestingly, previous studies have revealed that MC1R signalling induces the transcription of the NR4A subfamily of orphan nuclear receptors in response to UV. In line with this, studies have also observed that NR4A receptors are recruited to distinct nuclear foci in response to cellular stress, independent of their transcriptional roles. Here, we review the regulated expression of NR4A2 and its potential roles upon cellular stress conditions. Current work in developing synthetic NR4A2 agonists further provides exciting avenues for exploring the potential role of NR4A2 as an antiskin cancer drug target.
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Affiliation(s)
- Kelvin Yin
- School of Biomedical Science, The University of Queensland, Brisbane, Qld, Australia
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15
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Minder EI, Schneider-Yin X. Afamelanotide (CUV1647) in dermal phototoxicity of erythropoietic protoporphyria. Expert Rev Clin Pharmacol 2014; 8:43-53. [DOI: 10.1586/17512433.2014.956089] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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16
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Taylor NJ, Reiner AS, Begg CB, Cust AE, Busam KJ, Anton-Culver H, Dwyer T, From L, Gallagher RP, Gruber SB, Rosso S, White KA, Zanetti R, Orlow I, Thomas NE, Rebbeck TR, Berwick M, Kanetsky PA. Inherited variation at MC1R and ASIP and association with melanoma-specific survival. Int J Cancer 2014; 136:2659-67. [PMID: 25382380 DOI: 10.1002/ijc.29317] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2014] [Accepted: 10/22/2014] [Indexed: 01/04/2023]
Abstract
Melanocortin-1 receptor (MC1R) is a marker of melanoma risk in populations of European ancestry. However, MC1R effects on survival are much less studied. We investigated associations between variation at MC1R and survival in an international, population-based series of single primary melanoma patients enrolled into the Genes, Environment, and Melanoma study. MC1R genotype data was available for 2,200 participants with a first incident primary melanoma diagnosis. We estimated the association of MC1R genotypes with melanoma-specific survival (i.e., death caused by melanoma) and overall survival using COX proportional hazards modeling, adjusting for established prognostic factors for melanoma. We also conducted stratified analyses by Breslow thickness, tumor site, phenotypic index, and age. In addition, we evaluated haplotypes involving polymorphisms near the Agouti signaling protein gene (ASIP) locus for their impacts on survival. Melanoma-specific survival was inversely associated with carriage of MC1R variants in the absence of consensus alleles compared to carriage of at least one consensus allele (hazard ratio (HR) = 0.60; 95% confidence interval (CI): 0.40, 0.90). MC1R results for overall survival were consistent with no association. We did not observe any statistical evidence of heterogeneity of effect estimates in stratified analyses. We observed increased hazard of melanoma-specific death among carriers of the risk haplotype TG near the ASIP locus (HR = 1.37; 95% CI: 0.91, 2.04) when compared to carriers of the most common GG haplotype. Similar results were noted for overall survival. Upon examining the ASIP TG/TG diplotype, we observed considerably increased hazard of melanoma-specific death (HR = 5.11; 95% CI: 1.88, 13.88) compared to carriers of the most common GG/GG diplotype. Our data suggest improved melanoma-specific survival among carriers of two inherited MC1R variants.
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Affiliation(s)
- Nicholas J Taylor
- Department of Cancer Epidemiology, H. Lee Moffitt Cancer Center and Research Institute, Tampa, FL
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17
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Haddadeen C, Lai C, Cho SY, Healy E. Variants of the melanocortin-1 receptor: do they matter clinically? Exp Dermatol 2014; 24:5-9. [DOI: 10.1111/exd.12540] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/06/2014] [Indexed: 01/04/2023]
Affiliation(s)
- Ciara Haddadeen
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
| | - Chester Lai
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
| | - Shin-Young Cho
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
| | - Eugene Healy
- Dermatopharmacology; Sir Henry Wellcome Laboratories; Faculty of Medicine; University of Southampton; Southampton UK
- Dermatology; University Hospital Southampton NHS Foundation Trust; Southampton UK
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18
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S-(-)-10,11-dihydroxyfarnesoic acid methyl ester inhibits melanin synthesis in murine melanocyte cells. Int J Mol Sci 2014; 15:12750-63. [PMID: 25046747 PMCID: PMC4139872 DOI: 10.3390/ijms150712750] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2014] [Revised: 07/01/2014] [Accepted: 07/08/2014] [Indexed: 01/10/2023] Open
Abstract
The development of antimelanogenic agents is important for the prevention of serious aesthetic problems such as melasmas, freckles, age spots, and chloasmas. In the course of screening for melanin synthesis inhibitors, we found that the culture broth from an insect morphopathogenic fungus, Beauveria bassiana CS1029, exhibits potent antimelanogenic activity. We isolated and purified an active metabolite and identified it as S-(−)-10,11-dihydroxyfarnesoic acid methyl ester (dhFAME), an insect juvenile hormone. To address whether dhFAME inhibits melanin synthesis, we first measured the size of the melanin biosynthesis inhibition zone caused by dhFAME. dhFAME also showed inhibitory activity against mushroom tyrosinase in Melan-a cells. Intracellular, dose-dependent tyrosinase inhibition activity was also confirmed by zymography. In addition, we showed that dhFAME strongly inhibits melanin synthesis in Melan-a cells. Furthermore, we compared levels of TYR, TRP-1, TRP-2, MITF, and MC1R mRNA expression by reverse-transcription polymerase chain reaction and showed that treatment of Melan-a cells with 35 μM dhFAME led to an 11-fold decrease in TYR expression, a 6-fold decrease in TRP-2 expression, and a 5-fold decrease in MITF expression. Together, these results indicate that dhFAME is a potent inhibitor of melanin synthesis that can potentially be used for cosmetic biomaterial(s).
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19
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Böhm M, Luger TA, Steingräber AK, Goerge T. Is MC1 dispensable for regulation of cutaneous inflammatory and immune responses? Exp Dermatol 2014; 22:792-4. [PMID: 24131319 DOI: 10.1111/exd.12263] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/14/2013] [Indexed: 12/30/2022]
Abstract
The melanocortin-1 receptor (MC1 ) - being most abundantly expressed in the skin by melanocytes - has a physiological role for melanin pigmentation in many vertebrate species. MC1 has also been implicated in regulation of skin inflammation as this receptor is detectable in the majority of non-melanocytic cell types and its ligand α-melanocyte-stimulating hormone (α-MSH) exerts immunoregulatory and anti-inflammatory effects. However, in vivo studies on mice with targeted disruption of MC1 have been missing in the context of skin inflammation until recently. Wolnicka-Glubisz et al. now reported that the course of ultraviolet (UV)-induced inflammation, contact hypersensitivity, neonatal immune tolerance and UV-induced immunosuppression is similar in MC1 signal-deficient (C57BL/6-Mc1r(e/e)) and wild-type mice. These unexpected findings are supported by own observations in experimentally induced immune-complex-mediated vasculitis: Mc1r(e/e) mice exhibited a similar extent of the reverse passive cutaneous Arthus reaction compared with wild-type animals. Future studies are thus needed to clarify whether these findings are due to limitations in the chosen mouse model and/or point to additional MC subtypes that may regulate inflammatory and immune responses in the skin.
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Affiliation(s)
- Markus Böhm
- Department of Dermatology, Laboratory for Neuroendocrinology of the Skin and Interdisciplinary Endocrinology, University of Münster, Münster, Germany
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20
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Napolitano A, Panzella L, Monfrecola G, d'Ischia M. Pheomelanin-induced oxidative stress: bright and dark chemistry bridging red hair phenotype and melanoma. Pigment Cell Melanoma Res 2014; 27:721-33. [PMID: 24814217 DOI: 10.1111/pcmr.12262] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2014] [Accepted: 05/08/2014] [Indexed: 01/20/2023]
Abstract
The complex interplay of genetic and epigenetic factors linking sun exposure to melanoma in the red hair phenotype hinges on the peculiar physical and chemical properties of pheomelanins and the underlying biosynthetic pathway, which is switched on by the effects of inactivating polymorphisms in the melanocortin 1 receptor gene. In addition to the long recognized UV-dependent pathways of toxicity and cell damage, a UV-independent pro-oxidant state induced by pheomelanin within the genetically determined background of the red hair phenotype has recently been disclosed. This review provides a detailed discussion of the possible UV-dependent and UV-independent chemical mechanisms underlying pheomelanin-mediated oxidative stress, with special reference to the oxygen-dependent depletion of glutathione and other cell antioxidants. The new concept of pheomelanin as a 'living' polymer and biocatalyst that may grow by exposure to monomer building blocks and may trigger autooxidative processes is also discussed. As a corollary, treatment of inflammatory skin diseases in RHP patients is briefly commented. Finally, possible concerted strategies for melanoma prevention in the red hair phenotype are proposed.
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21
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Kinsler VA, Thomas AC, Ishida M, Bulstrode NW, Loughlin S, Hing S, Chalker J, McKenzie K, Abu-Amero S, Slater O, Chanudet E, Palmer R, Morrogh D, Stanier P, Healy E, Sebire NJ, Moore GE. Multiple congenital melanocytic nevi and neurocutaneous melanosis are caused by postzygotic mutations in codon 61 of NRAS. J Invest Dermatol 2013; 133:2229-36. [PMID: 23392294 PMCID: PMC3678977 DOI: 10.1038/jid.2013.70] [Citation(s) in RCA: 204] [Impact Index Per Article: 18.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2012] [Revised: 12/06/2012] [Accepted: 01/02/2013] [Indexed: 01/01/2023]
Abstract
Congenital melanocytic nevi (CMN) can be associated with neurological abnormalities and an increased risk of melanoma. Mutations in NRAS, BRAF, and Tp53 have been described in individual CMN samples; however, their role in the pathogenesis of multiple CMN within the same subject and development of associated features has not been clear. We hypothesized that a single postzygotic mutation in NRAS could be responsible for multiple CMN in the same individual, as well as for melanocytic and nonmelanocytic central nervous system (CNS) lesions. From 15 patients, 55 samples with multiple CMN were sequenced after site-directed mutagenesis and enzymatic digestion of the wild-type allele. Oncogenic missense mutations in codon 61 of NRAS were found in affected neurological and cutaneous tissues of 12 out of 15 patients, but were absent from unaffected tissues and blood, consistent with NRAS mutation mosaicism. In 10 patients, the mutation was consistently c.181C>A, p.Q61K, and in 2 patients c.182A>G, p.Q61R. All 11 non-melanocytic and melanocytic CNS samples from 5 patients were mutation positive, despite NRAS rarely being reported as mutated in CNS tumors. Loss of heterozygosity was associated with the onset of melanoma in two cases, implying a multistep progression to malignancy. These results suggest that single postzygotic NRAS mutations are responsible for multiple CMN and associated neurological lesions in the majority of cases.
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Affiliation(s)
- Veronica A Kinsler
- Paediatric Dermatology Department, Great Ormond Street Hospital for Children, London, UK.
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22
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Ward KA, Lazovich D, Hordinsky MK. Germline melanoma susceptibility and prognostic genes: A review of the literature. J Am Acad Dermatol 2012; 67:1055-67. [PMID: 22583682 DOI: 10.1016/j.jaad.2012.02.042] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2011] [Revised: 02/26/2012] [Accepted: 02/29/2012] [Indexed: 12/12/2022]
Affiliation(s)
- Katherine A Ward
- University of Minnesota Medical School, Minneapolis, Minnesota, USA
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23
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Redhead pigment boosts skin-cancer risk. Nature 2012. [DOI: 10.1038/nature.2012.11711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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24
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Kinsler VA, Abu-Amero S, Budd P, Jackson IJ, Ring SM, Northstone K, Atherton DJ, Bulstrode NW, Stanier P, Hennekam RC, Sebire NJ, Moore GE, Healy E. Germline melanocortin-1-receptor genotype is associated with severity of cutaneous phenotype in congenital melanocytic nevi: a role for MC1R in human fetal development. J Invest Dermatol 2012; 132:2026-32. [PMID: 22572819 PMCID: PMC3398254 DOI: 10.1038/jid.2012.95] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Congenital melanocytic nevi (CMN) are pigmented birthmarks that affect up to 80% of the skin surface area. The increased frequency of CMN in families of severely affected individuals is suggestive of a predisposing germline genotype. We noted a high prevalence of red hair in affected families, and considered a role for MC1R in this condition. A cohort of 166 CMN subjects underwent pigmentary phenotyping, with MC1R genotyping in 113. Results were compared with a local control group of 60 unrelated children and with 300 UK children without CMN. CMN subjects had higher prevalences of red hair and a red-haired parent than local controls and had a higher rate of compound heterozygosity and homozygosity for MC1R variants. The presence of a V92M or R allele (D84E, R151C, R160W, D294H) was associated with increasing size of the CMN, implying a growth-promoting effect of these alleles. Unexpectedly, the V92M and R151C alleles were also strongly associated with birth weight in the CMN cohort, a finding confirmed in the control group. The effect of germline MC1R genotype on development and severity of CMN led us to investigate potential broader effects on growth, revealing a role for MC1R in normal fetal development.
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Affiliation(s)
- Veronica A Kinsler
- Department of Paediatric Dermatology, Great Ormond Street Hospital for Children, London, UK
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25
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Henri P, Beaumel S, Guezennec A, Poumès C, Stoebner PE, Stasia MJ, Guesnet J, Martinez J, Meunier L. MC1R expression in HaCaT keratinocytes inhibits UVA-induced ROS production via NADPH oxidase- and cAMP-dependent mechanisms. J Cell Physiol 2012; 227:2578-85. [PMID: 21898403 DOI: 10.1002/jcp.22996] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Ultraviolet A (UVA) radiations are responsible for deleterious effects, mainly due to reactive oxygen species (ROS) production. Alpha-melanocyte stimulating hormone (α-MSH) binds to melanocortin-1 receptor (MC1R) in melanocytes to stimulate pigmentation and modulate cutaneous inflammatory responses. MC1R may be induced in keratinocytes after UV exposure. To investigate the effect of MC1R signaling on UVA-induced ROS (UVA-ROS) production, we generated HaCaT cells that stably express human MC1R (HaCaT-MC1R) or the Arg151Cys (R(151)C) non-functional variant (HaCaT-R(151)C). We then assessed ROS production immediately after UVA exposure and found that: (1) UVA-ROS production was strongly reduced in HaCaT-MC1R but not in HaCaT-R(151)C cells compared to parental HaCaT cells; (2) this inhibitory effect was further amplified by incubation of HaCaT-MC1R cells with α-MSH before UVA exposure; (3) protein kinase A (PKA)-dependent NoxA1 phosphorylation was increased in HaCaT-MC1R compared to HaCaT and HaCaT-R(151)C cells. Inhibition of PKA in HaCaT-MC1R cells resulted in a marked increase of ROS production after UVA irradiation; (4) the ability of HaCaT-MC1R cells to produce UVA-ROS was restored by inhibiting epidermal growth factor receptor (EGFR) or extracellular signal-regulated kinases (ERK) activity before UVA exposure. Our findings suggest that constitutive activity of MC1R in keratinocytes may reduce UVA-induced oxidative stress via EGFR and cAMP-dependent mechanisms.
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Affiliation(s)
- Pauline Henri
- Institute of Biomolecules Max Mousseron (IBMM), University Montpellier I and II, UMR CNRS 5247, Montpellier Cedex 5, France
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26
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Davies JR, Randerson-Moor J, Kukalizch K, Harland M, Kumar R, Madhusudan S, Nagore E, Hansson J, Höiom V, Ghiorzo P, Gruis NA, Kanetsky PA, Wendt J, Pjanova D, Puig S, Saiag P, Schadendorf D, Soufir N, Okamoto I, Affleck P, García-Casado Z, Ogbah Z, Ozola A, Queirolo P, Sucker A, Barrett JH, van Doorn R, Bishop DT, Newton-Bishop J. Inherited variants in the MC1R gene and survival from cutaneous melanoma: a BioGenoMEL study. Pigment Cell Melanoma Res 2012; 25:384-94. [PMID: 22325793 PMCID: PMC3490389 DOI: 10.1111/j.1755-148x.2012.00982.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Inherited MC1R variants modulate MITF transcription factor signaling, which in turn affects tumor cell proliferation, apoptosis, and DNA repair. The aim of this BioGenoMEL collaborative study in 10 melanoma cohorts was to test the hypothesis that inherited variants thereby moderate survival expectation. A survival analysis in the largest cohort (Leeds) was carried out adjusting for factors known to impact on survival. The results were then compared with data from nine smaller cohorts. The absence of any consensus MC1R alleles was associated with a significantly lower risk of death in the Leeds set (HR, 0.64; 95% CI, 0.46–0.89) and overall in the 10 data sets (HR, 0.78; 95% CI, 0.65–0.94) with some support from the nine smaller data sets considered together (HR, 0.83; 95% CI, 0.67–1.04). The data are suggestive of a survival benefit for inherited MC1R variants in melanoma patients.
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Affiliation(s)
- John R Davies
- Section of Epidemiology and Biostatistics, Leeds Institute of Molecular Medicine, University of Leeds, Leeds, UK.
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27
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Host phenotype characteristics and MC1R in relation to early-onset basal cell carcinoma. J Invest Dermatol 2011; 132:1272-9. [PMID: 22158557 PMCID: PMC3305835 DOI: 10.1038/jid.2011.402] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Basal cell carcinoma (BCC) incidence is increasing, particularly among adults under age 40. Pigment-related characteristics are associated with BCC in older populations, but epidemiologic studies among younger individuals and analyses of phenotype-genotype interactions are limited. We examined self-reported phenotypes and melanocortin 1 receptor gene (MC1R) variants in relation to early-onset BCC. BCC cases (n=377) and controls with benign skin conditions (n=390) under age 40 were identified through Yale’s Dermatopathology database. Factors most strongly associated with early-onset BCC were skin reaction to first summer sun for one hour [severe sunburn vs. tan odds ratio (OR)=12.27, 95% confidence interval (CI)=4.08–36.94] and skin color (very fair vs. olive OR=11.06, 95% CI=5.90–20.74). Individuals with two or more MC1R non-synonymous variants were 3.59 times (95% CI=2.37–5.43) more likely to have BCC than those without non-synonymous variants. All host characteristics and MC1R were more strongly associated with multiple BCC cases status (37% of cases) than single BCC case status. MC1R, number of moles, skin reaction to first summer sun for one hour, and hair and skin color were independently associated with BCC. BCC risk conferred by MC1R tended to be stronger among those with darker pigment phenotypes, traditionally considered to be at low-risk of skin cancer.
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28
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Dessinioti C, Antoniou C, Katsambas A, Stratigos AJ. Melanocortin 1 receptor variants: functional role and pigmentary associations. Photochem Photobiol 2011; 87:978-87. [PMID: 21749400 DOI: 10.1111/j.1751-1097.2011.00970.x] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The significance of human cutaneous pigmentation lies in its protective role against sun-induced DNA damage and photocarcinogenesis. Fair skin and red hair are characterized by a low eumelanin to pheomelanin ratio, and have been associated with increased risk of skin cancer. Cutaneous pigmentation is a complex genetic trait, with more than 120 genes involved in its regulation, among which the melanocortin 1 receptor gene (MC1R) plays a key role. Although a large number of single nucleotide polymorphisms (SNPs) have been identified in pigmentation genes, very few SNPs have been examined in relation to human pigmentary phenotypes and skin cancer risk. Recent GWAS have identified new candidate determinants of pigmentation traits, but MC1R remains the best characterized genetic determinant of human skin and hair pigmentation as well as the more firmly validated low-penetrance skin cancer susceptibility gene. In this review, we will address how the melanocortin system regulates pigmentation, the effect of MC1R variants on the physiologic function of the MC1 receptor, and how specific MC1R variants are associated with distinct human pigmentation phenotypes.
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Affiliation(s)
- Clio Dessinioti
- 1st Department of Dermatology, University of Athens, Andreas Sygros Hospital, Athens, Greece.
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29
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Beaumont KA, Wong SS, Ainger SA, Liu YY, Patel MP, Millhauser GL, Smith JJ, Alewood PF, Leonard JH, Sturm RA. Melanocortin MC₁ receptor in human genetics and model systems. Eur J Pharmacol 2011; 660:103-10. [PMID: 21199646 DOI: 10.1016/j.ejphar.2010.11.040] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2010] [Revised: 10/29/2010] [Accepted: 11/02/2010] [Indexed: 12/15/2022]
Abstract
The melanocortin MC(1) receptor is a G-protein coupled receptor expressed in the melanocytes of the skin and hair and is known for its key role in the regulation of human pigmentation. Melanocortin MC(1) receptor activation after ultraviolet radiation exposure results in a switch from the red/yellow pheomelanin to the brown/black eumelanin pigment synthesis within cutaneous melanocytes; this pigment is then transferred to the surrounding keratinocytes of the skin. The increase in melanin maturation and uptake results in tanning of the skin, providing a physical protection of skin cells from ultraviolet radiation induced DNA damage. Melanocortin MC(1) receptor polymorphism is widespread within the Caucasian population and some variant alleles are associated with red hair colour, fair skin, poor tanning and increased risk of skin cancer. Here we will discuss the use of mouse coat colour models, human genetic association studies, and in vitro cell culture studies to determine the complex functions of the melanocortin MC(1) receptor and the molecular mechanisms underlying the association between melanocortin MC(1) receptor variant alleles and the red hair colour phenotype. Recent research indicates that melanocortin MC(1) receptor has many non-pigmentary functions, and that the increased risk of skin cancer conferred by melanocortin MC(1) receptor variant alleles is to some extent independent of pigmentation phenotypes. The use of new transgenic mouse models, the study of novel melanocortin MC(1) receptor response genes and the use of more advanced human skin models such as 3D skin reconstruction may provide key elements in understanding the pharmacogenetics of human melanocortin MC(1) receptor polymorphism.
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Affiliation(s)
- Kimberley A Beaumont
- Institute for Molecular Bioscience, The University of Queensland, Brisbane QLD 4072, Australia
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30
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Berwick M. Red hair or not--reassessment of melanoma risk among CDKN2A carriers. Pigment Cell Melanoma Res 2010; 24:9-10. [PMID: 21118390 DOI: 10.1111/j.1755-148x.2010.00813.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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31
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Abstract
Reduced function alleles of the melanocortin 1 receptor (MC1R) lead to red hair, freckling, and sun sensitivity. They are also associated with an increased risk of skin cancer. But what pathways link gene variants with the cancer phenotype? In this issue, Robinson et al. describe their use of mouse transgenics to demonstrate that the MC1R signaling pathway influences cancer risk via mechanisms in addition to pigmentation.
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Affiliation(s)
- Jonathan L Rees
- Department of Dermatology, University of Edinburgh, Edinburgh, UK.
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32
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Scherer D, Kumar R. Genetics of pigmentation in skin cancer--a review. Mutat Res 2010; 705:141-153. [PMID: 20601102 DOI: 10.1016/j.mrrev.2010.06.002] [Citation(s) in RCA: 117] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2010] [Revised: 06/07/2010] [Accepted: 06/10/2010] [Indexed: 01/05/2023]
Abstract
Skin pigmentation is one of the most overt human physical traits with consequences on susceptibility to skin cancer. The variations in skin pigmentation are dependent on geographic location and population ethnicity. Skin colouration is mainly due to the pigmentation substance melanin, produced in specialized organelles (melanosomes) within dendritic melanocytes, and transferred to neighbouring keratinocytes. The two types of melanin synthesized in well defined chemical reactions are the protective dark coloured eumelanin and the sulphur containing light red-yellow pheomelanin. The events leading to the synthesis of melanin are controlled by signalling cascades that involve a host of genes encoding ligands, receptors, transcription factors, channel transporters and many other crucial molecules. Several variants within the genes involved in pigmentation have been associated with high risk phenotypes like fair skin, brown-red hair and green-blue eyes. Many of those variants have also been implicated in the risk of various skin cancers. The variants within the key pigmentation gene, melanocortin-receptor 1 (MC1R), in particular have been ubiquitously linked with high risk traits and skin cancers involving both pigmentary and non-pigmentary functions and likely interaction with variants in other genes. Many of the variants in other genes, functional in pigmentation pathway, have also been associated with phenotypic variation and risk of skin cancers. Those genes include agouti signalling protein (ASIP), tyrosinase (TYR), tyrosinase-related protein 1 (TYRP1), oculocutaneous albinism II (OCA2), various solute carrier genes and transporters. Most of those associations have been confirmed in genome wide association studies that at the same time have also identified new loci involved in phenotypic variation and skin cancer risk. In conclusion, the genetic variants within the genes involved in skin pigmentation besides influencing phenotypic traits are important determinants of risk of several skin cancers. However, ultimate risk of skin cancer is dependent on interplay between genetic and host factors.
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Affiliation(s)
- Dominique Scherer
- Division of Molecular Genetic Epidemiology, German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 580, D-69120 Heidelberg, Germany.
| | - Rajiv Kumar
- Division of Molecular Genetic Epidemiology, German Cancer Research Centre (DKFZ), Im Neuenheimer Feld 580, D-69120 Heidelberg, Germany
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