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Villafán H, Gutiérrez-Ospina G. Looking beyond Self-Protection: The Eyes Instruct Systemic Immune Tolerance Early in Life. Brain Sci 2023; 13:1261. [PMID: 37759864 PMCID: PMC10526493 DOI: 10.3390/brainsci13091261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2023] [Revised: 08/15/2023] [Accepted: 08/18/2023] [Indexed: 09/29/2023] Open
Abstract
The eyes provide themselves with immune tolerance. Frequent skin inflammatory diseases in young blind people suggest, nonetheless, that the eyes instruct a systemic immune tolerance that benefits the whole body. We tested this premise by using delayed skin contact hypersensitivity (DSCH) as a tool to compare the inflammatory response developed by sighted (S) and birth-enucleated (BE) mice against oxazolone or dinitrofluorobenzene at the ages of 10, 30 and 60 days of life. Adult mice enucleated (AE) at 60 days of age were also assessed when they reached 120 days of life. BE mice displayed exacerbated DSCH at 60 but not at 10 or 30 days of age. AE mice, in contrast, show no exacerbated DSCH. Skin inflammation in 60-day-old BE mice was hapten exclusive and supported by distinct CD8+ lymphocytes. The number of intraepidermal T lymphocytes and migrating Langerhans cells was, however, similar between S and BE mice by the age of 60 days. Our observations support the idea that the eyes instruct systemic immune tolerance that benefits organs outside the eyes from an early age. The higher prevalence of inflammatory skin disorders reported in young people might then reflect reduced immune tolerance associated with the impaired functional morphology of the eyes.
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Affiliation(s)
- Horacio Villafán
- Programa de Doctorado en Ciencias Biológicas, Unidad de Posgrado, Circuito de Posgrados, Ciudad Universitaria, Edificio D, 1piso, Coyoacán, Ciudad de México 04510, Mexico
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
| | - Gabriel Gutiérrez-Ospina
- Departamento de Biología Celular y Fisiología, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
- Coordinación de Psicobiología y Neurociencias, Facultad de Psicología, Universidad Nacional Autónoma de México, Ciudad de México 04510, Mexico
- Department of Zoology and Physiology and Wyoming Sensory Biology Center of Biomedical Research Excellence, University of Wyoming, Laramie, WY 82071, USA
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Del Duca E, Renert-Yuval Y, Pavel AB, Mikhaylov D, Wu J, Lefferdink R, Fang M, Sheth A, Blumstein A, Facheris P, Estrada YD, Rangel SM, Krueger JG, Paller AS, Guttman-Yassky E. Proteomic characterization of atopic dermatitis blood from infancy to adulthood. J Am Acad Dermatol 2023; 88:1083-1093. [PMID: 36773824 PMCID: PMC10231669 DOI: 10.1016/j.jaad.2022.12.050] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2022] [Revised: 10/10/2022] [Accepted: 12/11/2022] [Indexed: 02/12/2023]
Abstract
BACKGROUND Patients with atopic dermatitis (AD) have systemic biomarker dysregulation that differs by age group; however, the proteomic characteristics of these age-based changes are unknown. OBJECTIVE To profile blood proteins of patients with AD across different age groups versus age-appropriate controls. METHODS Using the Olink high-throughput proteomic platform, we profiled 375 serum proteins of 20 infants (age, 0-5 years), 39 children (age, 6-11 years), 21 adolescents (age, 12-17 years), and 20 adults (age, ≥18 years) with moderate-to-severe AD and 83 age-appropriate controls. RESULTS Each group presented a distinct systemic proteomic signature. Th2-related proteins were increased in infant AD and further intensified with age through adolescence and adulthood (interleukin 4/CCL13/CCL17). In contrast, Th1 axis down-regulation was detected in infants with AD and gradually reversed to increased Th1 products (interferon γ/CXCL9/CXCL10/CCL2) in patients with AD from childhood to adulthood. Despite their short disease duration, infants already had evidence of systemic inflammation, with significant upregulation of innate immunity (interleukin 17C/ interleukin-1RN), T-cell activation/migration (CCL19), Th2 (CCL13/CCL17), and Th17 (PI3) proteins. Adults with AD present unique upregulation of cardiovascular proteins related to coagulation and diabetes. LIMITATIONS Cross-sectional observational study with a single time point. CONCLUSION Systemic immune signatures of AD are age-specific beyond the shared Th2 immune activation. These data advocate for precision medicine approaches based on age-specific AD profiles.
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Affiliation(s)
- Ester Del Duca
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York; Department of Dermatology, University of Magna Graecia, Catanzaro, Italy
| | - Yael Renert-Yuval
- Laboratory for Investigative Dermatology, the Rockefeller University, New York, New York
| | - Ana B Pavel
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York; Department of Biomedical Engineering, University of Mississippi, University, Mississippi
| | - Daniela Mikhaylov
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York
| | - Jianni Wu
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York
| | - Rachel Lefferdink
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Milie Fang
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Anjani Sheth
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Alli Blumstein
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - Paola Facheris
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York; Department of Biomedical Science, Humanitas University, Pieve Emanuele, Italy
| | - Yeriel D Estrada
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York
| | - Stephanie M Rangel
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois
| | - James G Krueger
- Laboratory for Investigative Dermatology, the Rockefeller University, New York, New York
| | - Amy S Paller
- Department of Dermatology and Paediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois.
| | - Emma Guttman-Yassky
- Department of Dermatology and Laboratory of Inflammatory Skin Diseases, Icahn School of Medicine at Mount Sinai, New York; Laboratory for Investigative Dermatology, the Rockefeller University, New York, New York.
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Weihrauch T, Limberg MM, Gray N, Schmelz M, Raap U. Neurotrophins: Neuroimmune Interactions in Human Atopic Diseases. Int J Mol Sci 2023; 24:ijms24076105. [PMID: 37047077 PMCID: PMC10094011 DOI: 10.3390/ijms24076105] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 03/17/2023] [Accepted: 03/21/2023] [Indexed: 04/14/2023] Open
Abstract
Allergic diseases are accompanied by a variety of symptoms such as pruritus, coughing, sneezing, and watery eyes, which can result in severe physiological and even psychological impairments. The exact mechanisms of these conditions are not yet completely understood. However, recent studies demonstrated a high relevance of neurotrophins in allergic inflammation, as they induce cytokine release, mediate interaction between immune cells and neurons, and exhibit different expression levels in health and disease. In this review, we aim to give an overview of the current state of knowledge concerning the role of neurotrophins in atopic disorders such as atopic dermatitis, allergic asthma, and allergic rhinitis.
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Affiliation(s)
- Tobias Weihrauch
- Division of Experimental Allergy and Immunodermatology, Faculty of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany
| | - Maren M Limberg
- Division of Experimental Allergy and Immunodermatology, Faculty of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany
| | - Natalie Gray
- Division of Experimental Allergy and Immunodermatology, Faculty of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany
| | - Martin Schmelz
- Department of Experimental Pain Research, MCTN, Medical Faculty Mannheim, University of Heidelberg, 68167 Mannheim, Germany
| | - Ulrike Raap
- Division of Experimental Allergy and Immunodermatology, Faculty of Medicine and Health Sciences, University of Oldenburg, 26129 Oldenburg, Germany
- University Clinic of Dermatology and Allergy, University of Oldenburg, 26133 Oldenburg, Germany
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Navrazhina K, Garcet S, Frew JW, Zheng X, Coats I, Guttman-Yassky E, Krueger JG. The inflammatory proteome of hidradenitis suppurativa skin is more expansive than that of psoriasis vulgaris. J Am Acad Dermatol 2022; 86:322-330. [PMID: 34339761 PMCID: PMC8800946 DOI: 10.1016/j.jaad.2021.07.035] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2021] [Revised: 05/20/2021] [Accepted: 07/18/2021] [Indexed: 02/03/2023]
Abstract
BACKGROUND Although hidradenitis suppurativa (HS) shares some transcriptomic and cellular infiltrate features with psoriasis, their skin proteome remains unknown. OBJECTIVE To define and compare inflammatory protein biomarkers of HS and psoriasis skin. METHODS We assessed 92 inflammatory biomarkers in HS (n = 13), psoriasis (n = 11), and control skin (n = 11) using Olink high-throughput proteomics. We also correlated HS skin and blood biomarkers using proteomics and RNA sequencing. RESULTS We identified 57 differentially expressed proteins (DEPs) in lesional psoriasis and 64 DEPs in lesional HS skin, compared to healthy controls. Both HS and psoriasis lesional skin demonstrated a significant upregulation of T helper 1 and T helper 17 proteins. Healthy-appearing perilesional HS skin had 63 DEPs compared to healthy controls. Nonlesional HS and psoriasis skin had 24 and 7 DEPs, respectively, compared to healthy controls. Tumor necrosis factor and 8 other proteins were significantly correlated with clinical severity in perilesional HS skin (2 cm from a nodule). LIMITATIONS Inclusion of only moderate-to-severe patients and the cohort size. CONCLUSION HS has a greater inflammatory profile and is more diffusely distributed compared with psoriasis. Proteins correlated with disease severity are potential disease mediators. Perilesional skin is comparably inflamed to lesional skin, suggesting the need to treat beyond skin nodules.
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Affiliation(s)
- Kristina Navrazhina
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York; Weill Cornell/Rockefeller/Sloan Kettering Tri-Institutional MD-PhD Program, New York, New York
| | - Sandra Garcet
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York
| | - John W Frew
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York
| | - Xiuzhong Zheng
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York
| | - Israel Coats
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York
| | - Emma Guttman-Yassky
- Laboratory of Inflammatory Skin Diseases, Department of Dermatology, Icahn School of Medicine at Mount Sinai, New York, New York
| | - James G Krueger
- Laboratory for Investigative Dermatology, The Rockefeller University, New York, New York.
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Lowy DB, Makker PGS, Moalem-Taylor G. Cutaneous Neuroimmune Interactions in Peripheral Neuropathic Pain States. Front Immunol 2021; 12:660203. [PMID: 33912189 PMCID: PMC8071857 DOI: 10.3389/fimmu.2021.660203] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2021] [Accepted: 03/17/2021] [Indexed: 12/14/2022] Open
Abstract
Bidirectional interplay between the peripheral immune and nervous systems plays a crucial role in maintaining homeostasis and responding to noxious stimuli. This crosstalk is facilitated by a variety of cytokines, inflammatory mediators and neuropeptides. Dysregulation of this delicate physiological balance is implicated in the pathological mechanisms of various skin disorders and peripheral neuropathies. The skin is a highly complex biological structure within which peripheral sensory nerve terminals and immune cells colocalise. Herein, we provide an overview of the sensory innervation of the skin and immune cells resident to the skin. We discuss modulation of cutaneous immune response by sensory neurons and their mediators (e.g., nociceptor-derived neuropeptides), and sensory neuron regulation by cutaneous immune cells (e.g., nociceptor sensitization by immune-derived mediators). In particular, we discuss recent findings concerning neuroimmune communication in skin infections, psoriasis, allergic contact dermatitis and atopic dermatitis. We then summarize evidence of neuroimmune mechanisms in the skin in the context of peripheral neuropathic pain states, including chemotherapy-induced peripheral neuropathy, diabetic polyneuropathy, post-herpetic neuralgia, HIV-induced neuropathy, as well as entrapment and traumatic neuropathies. Finally, we highlight the future promise of emerging therapies associated with skin neuroimmune crosstalk in neuropathic pain.
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Affiliation(s)
- Daniel B Lowy
- School of Medical Sciences, The University of New South Wales, UNSW Sydney, Sydney, NSW, Australia
| | - Preet G S Makker
- School of Medical Sciences, The University of New South Wales, UNSW Sydney, Sydney, NSW, Australia
| | - Gila Moalem-Taylor
- School of Medical Sciences, The University of New South Wales, UNSW Sydney, Sydney, NSW, Australia
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Neuroinflammatory Gene Expression Pattern Is Similar between Allergic Rhinitis and Atopic Dermatitis but Distinct from Atopic Asthma. BIOMED RESEARCH INTERNATIONAL 2020; 2020:7196981. [PMID: 32596360 PMCID: PMC7305544 DOI: 10.1155/2020/7196981] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 04/22/2020] [Accepted: 05/05/2020] [Indexed: 11/18/2022]
Abstract
Methods In the study, we included 86 children diagnosed with atopic asthma (n = 25), allergic rhinitis (n = 20), and atopic dermatitis (n = 20) and healthy control subjects (n = 21) of Caucasian origin from the Polish population. The blood leukocyte expression of 31 genes involved in neuroinflammatory response (neurotrophins, their receptors, neuropeptides, and histamine signaling pathway) was analysed using TaqMan low-density arrays. The relative expression of selected proteins from plasma was done using TaqMan Protein Assays. Statistical analysis was done using Statistica. Results Blood expression of 31 genes related to neuroimmune interactions showed significant increase in both allergic diseases, allergic rhinitis and atopic dermatitis, in comparison to the control group. We found 12 genes significantly increased in allergic rhinitis and 9 genes in which the expression was elevated in atopic dermatitis. Moreover, 9 genes with changed expression in atopic dermatitis overlapped with those in allergic rhinitis. Atopic asthma showed 5 genes with altered expression. The peripheral expression of neuroinflammatory genes in the human study was verified in target tissues (nasal epithelium and skin) in a rat model of allergic inflammation. Conclusions A common pattern of neuroinflammatory gene expression between allergic rhinitis and atopic dermatitis may reflect similar changes in sensory nerve function during chronic allergic inflammation.
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Pincelli C. p75 Neurotrophin Receptor in the Skin: Beyond Its Neurotrophic Function. Front Med (Lausanne) 2017; 4:22. [PMID: 28326307 PMCID: PMC5339601 DOI: 10.3389/fmed.2017.00022] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2016] [Accepted: 02/16/2017] [Indexed: 12/16/2022] Open
Abstract
p75 neurotrophin receptor (p75NTR), also known as CD271, is the low-affinity receptor that, together with the tyrosine kinase receptor tropomyosin-receptor kinase (Trk), mediate neurotrophin (NT) functions. Beside their classic role in skin innervation, NT and their receptors constitute a complex cutaneous network associated with a number of autocrine and paracrine activities. In this context, the role of p75NTR is becoming more and more important. This review will focus on the intriguing functions of p75NTR in healthy and diseased skin. First, p75NTR counterbalances the proliferative and survival activities of its cognate receptor Trk by inducing keratinocyte apoptosis. In addition, p75NTR identifies an early transit-amplifying (TA) keratinocyte population and plays a critical role in keratinocyte stem cell transition to its progeny as well as in epidermal differentiation. p75NTR is absent in psoriatic TA cells, thus rendering these cells resistant to apoptosis. On the other hand, p75NTR infection restores NT-induced apoptosis in psoriatic keratinocytes. Taken together, these results provide evidence for a critical role of p75NTR in epidermal homeostasis, while its lack may account for the TA defect in psoriasis. While the issue of p75NTR as a marker of melanoma initiating cells is still to be solved, there is strong evidence that downregulation of this receptor is a precondition to melanoma invasion and metastasis in vitro and in vivo. All in all, this review points to p75NTR as a major actor in both physiologic and pathologic conditions at the skin level.
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Affiliation(s)
- Carlo Pincelli
- Laboratory of Cutaneous Biology, Department of Surgical, Medical, Dental and Morphological Sciences, University of Modena and Reggio Emilia , Modena , Italy
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İsmi O, Özcan C, Karabacak T, Polat G, Vayisoğlu Y, Güçlütürk T, Görür K. Local Effect of Neurotrophin-3 in Neuronal Inflammation of Allergic Rhinitis: Preliminary Report. Balkan Med J 2015; 32:364-70. [PMID: 26740895 DOI: 10.5152/balkanmedj.2015.151028] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2014] [Accepted: 04/22/2015] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Allergic rhinitis is a common inflammatory nasal mucosal disease characterized by sneezing, watery nasal discharge, nasal obstruction and itching. Although allergen-specific antibodies play a main role in the allergic airway inflammation, neuronal inflammation may also contribute to the symptoms of allergic rhinitis. Neuronal inflammation is primarily caused by the stimulation of sensory nerve endings with histamine. It has been shown that neurotrophins may also have a role in allergic reactions and neuronal inflammation. Nerve growth factor, neurotrophin 3 (NT-3), neurotrophin 4/5 and brain-derived neurotrophic factor are members of the neurotrophin family. Although nerve growth factor and brain-derived neurotrophic factor are well studied in allergic rhinitis patients, the exact role of Neurotrophin-3 is not known. AIMS To investigate the possible roles of neurotrophin-3 in allergic rhinitis patients. STUDY DESIGN Case-control study. METHODS Neurotrophin-3 levels were studied in the inferior turbinate and serum samples of 20 allergic rhinitis and 13 control patients. Neurotrophin-3 staining of nasal tissues was evaluated by immunohistochemistry and ELISA was used for the determination of serum Neurotrophin-3 levels. RESULTS Neurotrophin-3 staining scores were statistically higher in the study group than in the control patients (p=0.001). Regarding serum Neurotrophin-3 levels, no statistically significant difference could be determined between allergic rhinitis and control patients (p=0.156). When comparing the serum NT-3 levels with tissue staining scores, there were no statistically significant differences in the allergic rhinitis and control groups (p=0.254 for allergic rhinitis and p=0.624 for control groups). CONCLUSION We suggest that Neurotrophin-3 might affect the nasal mucosa locally without being released into the systemic circulation in allergic rhinitis patients.
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Affiliation(s)
- Onur İsmi
- Department of Otorhinolaryngology, Mersin University Faculty of Medicine, Mersin, Turkey
| | - Cengiz Özcan
- Department of Otorhinolaryngology, Mersin University Faculty of Medicine, Mersin, Turkey
| | - Tuba Karabacak
- Department of Pathology, Mersin University Faculty of Medicine, Mersin, Turkey
| | - Gürbüz Polat
- Department of Medical Biochemistry, Mersin University Faculty of Medicine, Mersin, Turkey
| | - Yusuf Vayisoğlu
- Department of Otorhinolaryngology, Mersin University Faculty of Medicine, Mersin, Turkey
| | - Taylan Güçlütürk
- Department of Otorhinolaryngology, Gaziantep State Hospital, Gaziantep, Turkey
| | - Kemal Görür
- Department of Otorhinolaryngology, Mersin University Faculty of Medicine, Mersin, Turkey
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Increased circulating levels of neurotrophins and elevated expression of their high-affinity receptors on skin and gut mast cells in mastocytosis. Blood 2013; 122:1779-88. [DOI: 10.1182/blood-2012-12-469882] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Key Points
Patients with mastocytosis feature increased NT serum levels and elevated expression of modified NT receptors on skin and gut MCs. NTs might contribute to mastocytosis via increased migration of MC progenitors, MC differentiation, proliferation, and/or survival.
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Beggs S, Alvares D, Moss A, Currie G, Middleton J, Salter MW, Fitzgerald M. A role for NT-3 in the hyperinnervation of neonatally wounded skin. Pain 2012; 153:2133-2139. [PMID: 22871470 PMCID: PMC3657181 DOI: 10.1016/j.pain.2012.07.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2012] [Revised: 05/10/2012] [Accepted: 07/06/2012] [Indexed: 12/31/2022]
Abstract
Neurotrophin-3 (NT-3) is a target-derived neurotrophic factor that regulates sensory neuronal survival and growth. Here we report that NT-3 plays a critical permissive role in cutaneous sensory nerve sprouting that contributes to pain and sensitivity following skin wounding in young animals. Sensory terminal sprouting in neonatally wounded dermis and epidermis is accompanied by increased NT-3 transcription, NT-3 protein levels, and NT-3 protein release 3-7 days post skin injury in newborn rats and mice. Functional blockade of NT-3 activity with specific antibodies greatly reduces sensory neurite outgrowth induced by wounded skin, but not by naïve skin, in dorsal root ganglion/skin co-cultures. The requirement for NT-3 for sensory terminal sprouting in vivo is confirmed by the absence of wound-induced hyperinnervation in heterozygous transgenic mice (NT-3(+/-)lacZ). We conclude that upregulation of NT-3 in neonatally wounded skin is a critical factor mediating the sensory nerve sprouting that underlies hypersensitivity and pain following skin injury.
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Affiliation(s)
- Simon Beggs
- Programme in Neurosciences & Mental Health, The Hospital for Sick Children, Toronto, ON, Canada
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
- Corresponding author at: Programme in Neurosciences & Mental Health, The Hospital for Sick Children, 555 University Avenue, Toronto, ON, Canada M5G 1X8. Tel.: +1 4168135021.
| | - Debie Alvares
- Department of Neuroscience, Physiology & Pharmacology, University College London, London, UK
| | - Andrew Moss
- Department of Neuroscience, Physiology & Pharmacology, University College London, London, UK
| | - Gillian Currie
- Faculty of Dentistry, University of Toronto, Toronto, ON, Canada
| | - Jacqueta Middleton
- Department of Neuroscience, Physiology & Pharmacology, University College London, London, UK
| | - Michael W. Salter
- Programme in Neurosciences & Mental Health, The Hospital for Sick Children, Toronto, ON, Canada
| | - Maria Fitzgerald
- Department of Neuroscience, Physiology & Pharmacology, University College London, London, UK
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Saito A, Tanaka H, Usuda H, Shibata T, Higashi S, Yamashita H, Inagaki N, Nagai H. Characterization of skin inflammation induced by repeated exposure of toluene, xylene, and formaldehyde in mice. ENVIRONMENTAL TOXICOLOGY 2011; 26:224-232. [PMID: 19904815 DOI: 10.1002/tox.20547] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Volatile organic compounds (VOCs) are considered the main cause of sick building syndrome and they are likely to irritate the skin, eyes, and mucous membrane; however, the toxic threshold and the mechanisms of cutaneous reaction induced by long-time VOC exposure have not been clarified. In the present study, we investigated the effect of repeated painting of VOCs onto mouse skin. Various concentrations of toluene, xylene, and formaldehyde (FA) were applied once a week for 5 weeks. While FA solution (2-10%) induced remarkable ear swelling and caused evident infiltration of inflammatory cells, high concentrations of toluene and xylene (50 or 100%) evoked mild ear swelling and marginal inflammatory cell invasion. In addition, FA exposure markedly increased the expression of interleukin-4 (IL-4), brain-derived neurotrophic factor (BDNF), neurotrophin-3 (NT-3), and transient receptor potential vanilloid-1 (TRPV-1) mRNAs in the ears and IL-4 and NT-3 mRNAs in the cervical lymph nodes. Furthermore, capsazepine, a TRPV-1 antagonist, significantly suppressed ear swelling caused by repeated painting of 5% FA. These findings demonstrate that FA has more potent irritancy against skin than toluene or xylene and suggest that the Th2 response, neurotrophins and TRPV-1 play important roles in FA-induced skin inflammation.
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Affiliation(s)
- Asaka Saito
- Laboratory of Pharmacology, Department of Bioactive Molecules, Gifu Pharmaceutical University, Gifu, Japan
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Demel C, Hoegen T, Giese A, Angele B, Pfister HW, Koedel U, Klein M. Reduced spiral ganglion neuronal loss by adjunctive neurotrophin-3 in experimental pneumococcal meningitis. J Neuroinflammation 2011; 8:7. [PMID: 21261959 PMCID: PMC3038911 DOI: 10.1186/1742-2094-8-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2010] [Accepted: 01/24/2011] [Indexed: 12/20/2022] Open
Abstract
Background Hearing loss is a frequent long-term complication of pneumococcal meningitis (PM). Its main pathological correlate is damage to the organ of Corti and loss of spiral ganglion neurons. The only current treatment option is cochlear implants which require surviving neurons. Here, we investigated the impact of systemically applied neurotrophin-3 (NT-3) on long-term hearing loss and the survival of neurons. Methods Eighteen hours after infection with S. pneumoniae, C57BL/6 mice were treated with a combination of ceftriaxone with NT-3 or dexamethasone or placebo. Hearing, cochlear damage, and brain damage were assessed by audiometry and histology. Results The main findings from immunohistochemical visualization of neurotrophins (NT-3, BDNF) and their receptors (TrkB, TrkC, and p75) in the cochlea were (i) enhanced staining for the cell survival-promoting receptor TrkB and (ii) increased NT-3 staining in NT-3 treated mice, showing that systemically applied NT-3 reaches the cochlea. The major effects of adjunctive NT-3 treatment were (i) a reduction of meningitis-induced hearing impairment and (ii) a reduction of spiral ganglion neuronal loss. The efficacy of NT-3 therapy was comparable to that of dexamethasone. Conclusion Systemically applied NT-3 might be an interesting candidate to improve hearing outcome after pneumococcal meningitis.
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Affiliation(s)
- Cornelia Demel
- Department of Neurology, Klinikum Grosshadern, Ludwig Maximilians University Munich, Marchioninistrasse 15, 81377 Munich, Germany
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