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Scrivo R, D'Angelo S, Carriero A, Castellani C, Perrotta FM, Conti F, Vecellio M, Selmi C, Lubrano E. The Conundrum of Psoriatic Arthritis: a Pathogenetic and Clinical Pattern at the Midpoint of Autoinflammation and Autoimmunity. Clin Rev Allergy Immunol 2023; 65:72-85. [PMID: 35040085 DOI: 10.1007/s12016-021-08914-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/20/2021] [Indexed: 02/06/2023]
Abstract
Psoriatic arthritis (PsA) is a chronic inflammatory condition characterized by psoriasis, synovitis, enthesitis, spondylitis, and the possible association with other extra-articular manifestations and comorbidities. It is a multifaceted and systemic disorder sustained by complex pathogenesis, combining aspects of autoinflammation and autoimmunity. Features of PsA autoinflammation include the role of biomechanical stress in the onset and/or exacerbation of the disease; the evidence of involvement of the innate immune response mediators in the skin, peripheral blood and synovial tissue; an equal gender distribution; the clinical course which may encounter periods of prolonged remission and overlapping features with autoinflammatory syndromes. Conversely, the role of autoimmunity is evoked by the association with class I major histocompatibility complex alleles, the polyarticular pattern of the disease which sometimes resembles rheumatoid arthritis and the presence of serum autoantibodies. Genetics also provide important insights into the pathogenesis of PsA, particularly related to class I HLA being associated with psoriasis and PsA. In this review, we provide a comprehensive review of the pathogenesis, genetics and clinical features of PsA that endorse the mixed nature of a disorder at the crossroads of autoinflammation and autoimmunity.
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Affiliation(s)
- Rossana Scrivo
- Rheumatology Unit, Department of Clinical Internal, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy
| | - Salvatore D'Angelo
- Rheumatology Institute of Lucania (IReL) - Rheumatology Department of Lucania, San Carlo Hospital of Potenza and Madonna Delle Grazie Hospital of Matera, Potenza, Italy
| | - Antonio Carriero
- Rheumatology Institute of Lucania (IReL) - Rheumatology Department of Lucania, San Carlo Hospital of Potenza and Madonna Delle Grazie Hospital of Matera, Potenza, Italy
- Dipartimento Di Medicina E Scienze Della Salute, Università Degli Studi del Molise, Campobasso, Italy
| | - Chiara Castellani
- Rheumatology Unit, Department of Clinical Internal, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy
| | - Fabio Massimo Perrotta
- Dipartimento Di Medicina E Scienze Della Salute, Università Degli Studi del Molise, Campobasso, Italy
| | - Fabrizio Conti
- Rheumatology Unit, Department of Clinical Internal, Anesthesiological and Cardiovascular Sciences, Sapienza University of Rome, Rome, Italy
| | - Matteo Vecellio
- Division of Rheumatology and Clinical Immunology, Humanitas Clinical and Research Center - IRCCS, Rozzano, MI, Italy
- Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Botnar Research Center, Oxford, UK
| | - Carlo Selmi
- Division of Rheumatology and Clinical Immunology, Humanitas Clinical and Research Center - IRCCS, Rozzano, MI, Italy
- Department of Biomedical Sciences, Humanitas University, Pieve Emanuele, MI, Italy
| | - Ennio Lubrano
- Dipartimento Di Medicina E Scienze Della Salute, Università Degli Studi del Molise, Campobasso, Italy
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Wolf P, Weger W, Patra V, Gruber-Wackernagel A, Byrne SN. Desired response to phototherapy vs photoaggravation in psoriasis: what makes the difference? Exp Dermatol 2018; 25:937-944. [PMID: 27376966 DOI: 10.1111/exd.13137] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/29/2016] [Indexed: 12/13/2022]
Abstract
Psoriasis commonly responds beneficially to UV radiation from natural sunlight or artificial sources. Therapeutic mechanisms include the proapoptotic and immunomodulating effects of UV, affecting many cells and involving a variety of pro- and anti-inflammatory cytokines, downregulating the Th17/IL-23 response with simultaneous induction of regulatory immune cells. However, exposure to UV radiation in a subset of psoriasis patients leads to exacerbation of the disease. We herein shed light on the predisposing factors of photosensitive psoriasis, including genetics (such as HLA-Cw*0602 or CARD14), gender and coexisting photodermatoses such as polymorphic light eruption (PLE) in the context of potential molecular mechanisms behind therapeutic photoresponsiveness or photoaggravation. UV-induced damage/pathogen-associated molecular patterns, damage to self-coding RNA (signalling through Toll-like receptors), certain antimicrobial peptides and/or inflammasome activation may induce innate immunity, leading to psoriasis at the site of UV exposure when there is concomitant, predisposing resistance against UV-induced suppression of the adaptive immune response (like in PLE) that otherwise would act to reduce psoriasis.
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Affiliation(s)
- Peter Wolf
- Research Unit for Photodermatology, Department of Dermatology, Medical University of Graz, Graz, Austria
| | - Wolfgang Weger
- Research Unit for Photodermatology, Department of Dermatology, Medical University of Graz, Graz, Austria
| | - VijayKumar Patra
- Research Unit for Photodermatology, Department of Dermatology, Medical University of Graz, Graz, Austria
| | | | - Scott N Byrne
- Cellular Photoimmunology Group, Infectious Diseases and Immunology, Sydney Medical School, Charles Perkins Centre, The University of Sydney, Sydney, NSW, Australia
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Ryu HS, Lee HK, Kim JS, Kim YG, Pyo M, Yun J, Hwang BY, Hong JT, Kim Y, Han SB. Saucerneol D inhibits dendritic cell activation by inducing heme oxygenase-1, but not by directly inhibiting toll-like receptor 4 signaling. JOURNAL OF ETHNOPHARMACOLOGY 2015; 166:92-101. [PMID: 25792017 DOI: 10.1016/j.jep.2015.03.020] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2014] [Revised: 02/17/2015] [Accepted: 03/08/2015] [Indexed: 06/04/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Saururus chinensis is a medicinal plant used to treat jaundice, pneumonia, edema, fever, and several inflammatory diseases. Saucerneol D (SD), a lignan constituent of this plant, has antioxidant, anti-asthmatic, and anti-inflammatory activities. SD has been previously reported to inhibit the pro-inflammatory responses of RAW264.7 cells and primary mast cells. In this study, we investigated the effect of SD on the functions of dendritic cells (DCs). MATERIALS AND METHODS SD was isolated from methanol extract of the roots of S. chinensis. Bone marrow-derived DCs were used as target cells. The effects of SD on the following DC functions were examined: surface molecule expression, cytokine expression, migration, allogenic T cell activation, heme oxygenase-1 expression, and Toll-like receptor 4 signaling. RESULTS In lipopolysaccharide (LPS)-treated DCs, SD inhibited the expression of cell surface molecules (MHC I/II, CD40, CD80, and CD86), the production of inflammatory mediators (nitric oxide, IL-12, IL-1β, and TNF-α), and allogenic T cell activation capacity. SD also inhibited DC migration toward MIP-3β by down-regulating CCR7 expression. SD attenuated LPS-induced activation of NF-κB and MAPK signaling in DCs, but did not directly inhibit kinase activities of IRAK1, IRAK4, TAK1, or IKKβ in enzymatic assays. SD did not inhibit LPS binding to myeloid differentiation protein-2, co-receptor of TLR4. SD increased the production of reactive oxygen species, Nrf-2, and heme oxygenase (HO)-1, which degrades the heme to immunosuppressive carbon monoxide and biliverdin, which may underlie the anti-inflammatory effects in SD-treated DCs. CONCLUSIONS Taken together, these data suggest that SD suppresses LPS-induced activation of DCs through the induction of HO-1, but not by directly affecting Toll-like receptor 4 signaling.
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Affiliation(s)
- Hwa Sun Ryu
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Hong Kyung Lee
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Ji Sung Kim
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Yong Guk Kim
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Minji Pyo
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Jieun Yun
- Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, South Korea
| | - Bang Yeon Hwang
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Jin Tae Hong
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Youngsoo Kim
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea
| | - Sang-Bae Han
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 362-763, South Korea.
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Chen Y, Lyga J. Brain-skin connection: stress, inflammation and skin aging. ACTA ACUST UNITED AC 2015; 13:177-90. [PMID: 24853682 PMCID: PMC4082169 DOI: 10.2174/1871528113666140522104422] [Citation(s) in RCA: 109] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2014] [Revised: 05/07/2014] [Accepted: 05/20/2014] [Indexed: 02/06/2023]
Abstract
The intricate relationship between stress and skin conditions has been documented since ancient times. Recent clinical observations also link psychological stress to the onset or aggravation of multiple skin diseases. However, the exact underlying mechanisms have only been studied and partially revealed in the past 20 years or so. In this review, the authors will discuss the recent discoveries in the field of “Brain-Skin Connection”, summarizing findings from the overlapping fields of psychology, endocrinology, skin neurobiology, skin inflammation, immunology, and pharmacology.
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Affiliation(s)
| | - John Lyga
- Global R&D, Avon Products. 1 Avon Place, Suffern, NY 10901, USA.
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Park Y, Ryu HS, Lee HK, Kim JS, Yun J, Kang JS, Hwang BY, Hong JT, Kim Y, Han SB. Tussilagone inhibits dendritic cell functions via induction of heme oxygenase-1. Int Immunopharmacol 2014; 22:400-8. [PMID: 25091622 DOI: 10.1016/j.intimp.2014.07.023] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2014] [Revised: 07/19/2014] [Accepted: 07/21/2014] [Indexed: 02/05/2023]
Abstract
Sesquiterpenoid tussilagone (TUS) has a variety of pharmacological activities, such as anti-oxidant, anti-cancer, and anti-inflammatory activities. In this study, we investigated the effects of TUS on dendritic cell (DC) functions and the underlying mechanisms. TUS inhibited lipopolysaccharide (LPS)-induced activation of DCs, as shown by decrease in surface molecule expression, cytokine production, cell migration, and allo-T cell activation. In addition, TUS inhibited LPS-induced activation of NF-κB, MAPKs, and IRF-3 signalings in DCs, although it did not directly affect kinase activities of IRAK1/4, TAK1, and IKK, which suggests that TUS might indirectly inhibit TLR signaling in DCs. As a critical mechanism, we showed that TUS activated heme oxygenase-1 (HO-1), which degrades heme to immunosuppressive products, such as carbon monoxide and bilirubin. HO-1 inhibitor reversed the inhibitory activity of TUS in DCs. In conclusion, this study suggests that TUS inhibits DC function through the induction of HO-1.
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Affiliation(s)
- Yunsoo Park
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Hwa Sun Ryu
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Hong Kyung Lee
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Ji Sung Kim
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Jieun Yun
- Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, South Korea
| | - Jong Soon Kang
- Korea Research Institute of Bioscience and Biotechnology, Ochang, Chungbuk 363-883, South Korea
| | - Bang Yeon Hwang
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Jin Tae Hong
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Youngsoo Kim
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea
| | - Sang-Bae Han
- College of Pharmacy, Chungbuk National University, Cheongju, Chungbuk 361-763, South Korea.
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Ramos MI, Tak PP, Lebre MC. Fms-like tyrosine kinase 3 ligand-dependent dendritic cells in autoimmune inflammation. Autoimmun Rev 2013; 13:117-24. [PMID: 24113138 DOI: 10.1016/j.autrev.2013.09.010] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Accepted: 09/25/2013] [Indexed: 12/19/2022]
Abstract
Dendritic cells (DCs) are specialized in capture, processing and presentation of antigens to T cells. Depending on the type of DC and its activation state, the interaction of DCs with naive T cells can lead to different types of immune response, or to T-cell tolerance. The existence of many specialized subtypes of DCs with particular functions has raised the need to distinguish DCs formed in steady-state from those produced during an inflammatory response. In patients with autoimmune disease and in experimental animal models of autoimmunity, DCs show abnormalities in both numbers and activation state, expressing immunogenic levels of co-stimulatory molecules and pro-inflammatory cytokines. Initial in vitro studies of cytokines in DC development revealed distinct and important roles for the receptor tyrosine kinases, granulocyte-macrophage colony-stimulating factor (GM-CSF), macrophage colony-stimulating factor (M-CSF, also called CSF1) and fms-like tyrosine kinase 3 ligand (Flt3L) in the generation of DCs. Flt3L is critical for instructing DC generation throughout different organs and regulates DC development from Flt3(+) lymphoid and myeloid-committed progenitors to DCs in vivo. The aim of this review is to provide an overview of the role of Flt3L-dependent DCs in the immunopathogenesis of autoimmunity and chronic inflammation and its potential as therapeutic targets.
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Affiliation(s)
- M I Ramos
- Department of Clinical Immunology and Rheumatology, Academic Medical Center/University of Amsterdam, Amsterdam, The Netherlands; Department of Experimental Immunology, Academic Medical Center/University of Amsterdam, Amsterdam, The Netherlands
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17β-estradiol induces CD40 expression in dendritic cells via MAPK signaling pathways in a minichromosome maintenance protein 6-dependent manner. ACTA ACUST UNITED AC 2011; 63:2425-35. [DOI: 10.1002/art.30420] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
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Chiang YY, Lin HW. Association between psoriasis and chronic obstructive pulmonary disease: a population-based study in Taiwan. J Eur Acad Dermatol Venereol 2011; 26:59-65. [DOI: 10.1111/j.1468-3083.2011.04009.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Coto-Segura P, Coto E, Mas-Vidal A, Morales B, Alvarez V, Díaz M, Alonso B, Santos-Juanes J. Influence of endothelial nitric oxide synthase polymorphisms in psoriasis risk. Arch Dermatol Res 2011; 303:445-9. [PMID: 21293869 DOI: 10.1007/s00403-011-1129-9] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2010] [Revised: 01/18/2011] [Accepted: 01/19/2011] [Indexed: 01/30/2023]
Abstract
Nitric oxide (NO) is a potent regulator of keratinocyte growth and differentiation that has been implicated in the pathogenesis of psoriasis (Ps). The NOS3 -786 T/C (SNP id rs2070744; http://www.ensembl.org ), intron 4 variable number tandem repeat (VNTR), and Glu298Asp (SNP id rs1799983) polymorphisms, have been associated with differences in NO plasma concentrations and with the risk of hypertension (HT) and ischemic cardiac disease. The aim of this study was to determine whether the above-mentioned NOS3 variants contributed to the risk of Ps, and were associated with the risk for HT and CAD in these patients. A total of 368 patients with chronic plaque Ps and 400 healthy controls were genotyped for the NOS3 -786 T/C, intron 4 VNTR, and Glu298Asp polymorphisms. Carriers of the -786 C allele were significantly more frequent among the patients (p < 0.001). Carriers of the 4-repeats allele (45 + 44 genotypes) were also more frequent a (p < 0.001). No significant difference was found for the Glu298Asp polymorphism. None of the NOS3 variants was associated with Ht and CAD in our population. In conclusion, NOS3 gene polymorphism would be risk factors for developing Ps.
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Affiliation(s)
- Pablo Coto-Segura
- Dermatology II Department, University Hospital Central of Asturias (HUCA), 33007, Oviedo, Spain.
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Amadeu TP, Seabra AB, de Oliveira MG, Costa AMA. S-nitrosoglutathione-containing hydrogel accelerates rat cutaneous wound repair. J Eur Acad Dermatol Venereol 2007; 21:629-37. [PMID: 17447976 DOI: 10.1111/j.1468-3083.2006.02032.x] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Nitric oxide (NO) plays a key role in wound repair and S-nitrosothiols like S-nitrosoglutathione (GSNO) are well known NO donors. METHODS Animals were separated in two groups and submitted to excisional wounds on the dorsal surface at the first day. GSNO (100 microm)-containing hydrogels were topically applied on the wound bed in the GSNO group, daily, during the first 4 days. Control group was topically treated with hydrogel without GSNO for the same period. Wound contraction and re-epithelialization were measured. Animals were sacrificed 21 days after wounding. Samples of lesion and normal tissue were formalin-fixed, paraffin embedded for histological analysis. RESULTS Wound contraction, measured 14 and 21 days after wounding, was greater in the GSNO group than in the control group (P<0.05 for both). The re-epithelialized wound area, measured 14 days after wounding, was higher in the GSNO group than in the control group (P<0.05). A higher amount of inflammatory cells was observed in superficial and deep areas of the granulation tissue of the control group compared to the GSNO group. Twenty-one days after wounding, thin red-yellow collagen fibers arranged perpendicularly to the surface were found in the granulation tissue of the control group, whereas in the GSNO-treated group collagen fibers were thicker and arranged parallel to the surface. Increased number of mast cells was observed in the GSNO group compared with that in the control group. Vascularization and myofibroblast distribution were similar in both groups. CONCLUSION Topical application of GSNO-containing hydrogel during the early phases of rat cutaneous wound repair accelerates wound closure and re-epithelialization and affects granulation tissue organization.
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Affiliation(s)
- T P Amadeu
- Histology and Embryology Department, State University of Rio de Janeiro, UERJ, Rio de Janeiro, Brazil
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Wojas-Pelc A, Marcinkiewicz J. What is a role of haeme oxygenase-1 in psoriasis? Current concepts of pathogenesis. Int J Exp Pathol 2007; 88:95-102. [PMID: 17408452 PMCID: PMC2517294 DOI: 10.1111/j.1365-2613.2006.00505.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The skin is constantly exposed to endogenous and environmental pro-oxidant agents, which lead to harmful generation of reactive oxygen species (ROS). Healthy skin, being a potential target for oxidative stress, is equipped with a large number of defence mechanisms including antioxidant systems. This protection can be corrupted by an imbalance between ROS and antioxidants with pathological level of oxidants prevailing. There is a great body of evidence indicating that some inflammatory skin diseases, such as psoriasis, are mediated by oxidative stress. Keratinocytes of normal skin, the primary target for pro-oxidant agents, show strong expression of ROS-detoxifying enzymes. In addition, normal keratinocytes express haeme oxygenase (HO), an enzyme which might be involved in the protection of cells against oxidative stress. HO (inducible HO-1, constitutive HO-2 and HO-3) is the rate-limiting enzyme in haeme catabolism, which leads to the generation of biliverdin, iron, and carbon monoxide. HO-1 is a stress-responsive protein whose expression is induced by various oxidative agents. HO-1 is known for its cytoprotective, antioxidant and anti-inflammatory properties. Interestingly, a strong overexpression of HO-1 was observed in psoriatic skin. However, the role of HO-1 in psoriasis remains unclear. In this review, we will discuss some current concepts concerning pathogenesis of psoriasis and the contribution of HO-1 in skin inflammation to show the relationships between HO-1, ROS and cytokine network in psoriatic skin. We will try to answer a question whether enhanced HO-1 expression in keratinocytes results in beneficial or detrimental effect on the development and severity of psoriatic lesions.
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Affiliation(s)
- Anna Wojas-Pelc
- Department of Dermatology, Jagiellonian University Medical CollegeCracow, Poland
| | - Janusz Marcinkiewicz
- Department of Chair of Immunology, Jagiellonian University Medical CollegeCracow, Poland
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Vascotto SG, Beug S, Liversage RA, Tsilfidis C. Expression profiles of elastase1 (NvElastaseI) and secretory leukocyte protease inhibitor (NvSLPI) during forelimb regeneration in adult Notophthalmus viridescens suggest a role in epithelial remodeling and delamination. Dev Genes Evol 2006; 216:499-509. [PMID: 16508785 DOI: 10.1007/s00427-006-0061-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2005] [Accepted: 01/20/2006] [Indexed: 10/25/2022]
Abstract
Extracellular proteases and their inhibitors may regulate a number of important processes involved in forelimb regeneration in the adult newt, including epithelial remodeling, breakdown of extracellular matrix, and dedifferentiation. We have identified a newt homologue of human ElastaseI (NvElastaseI) and its potential inhibitor, SLPI (NvSLPI), and evaluated their spatial and temporal expression during limb regeneration. NvElastaseI is upregulated early in regeneration and is associated with subdermal and wound epithelial cells, suggesting an involvement in wound healing and the generation of the wound epithelium. Up until 15 days post-amputation, NvElastaseI is also scattered throughout the developing blastema and may have a role in the dedifferentiation of stump tissues. NvSLPI is found at the interface between the intact skin and the wound epithelium, and may limit NvElastaseI activity. NvSLPI is also expressed in dermal glands, and is likely involved in anti-microbial activity or function. Quite apart from regeneration, complementary patterns of expression of NvElastaseI and NvSLPI are associated with newt epithelial sloughing.
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Affiliation(s)
- Sandy Gian Vascotto
- University of Ottawa Eye Institute,Ottawa Hospital, General Division, Ottawa, ON, Canada
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Mende I, Karsunky H, Weissman IL, Engleman EG, Merad M. Flk2+ myeloid progenitors are the main source of Langerhans cells. Blood 2005; 107:1383-90. [PMID: 16263793 PMCID: PMC1895406 DOI: 10.1182/blood-2005-05-1878] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Langerhans cells (LCs) are antigen-presenting cells (APCs) residing in the epidermis that play a major role in skin immunity. Our earlier studies showed that when skin is inflamed LCs are replaced by bone marrow-derived progenitor cells, while during steady-state conditions LCs are able to self-renew in the skin. Identification of the LC progenitors in bone marrow would represent a critical step toward identifying the factors that regulate LC generation as well as their trafficking to the skin. To determine LC lineage origin, we reconstituted lethally irradiated CD45.2 mice with rigorously purified lymphoid and myeloid progenitors from CD45.1 congenic mice. Twenty-four hours later, we exposed the mice to UV light to deplete resident LCs and induce their replacement by progenitors. Reconstitution with common myeloid progenitors (CMPs), common lymphoid progenitors (CLPs), granulocyte-macrophage progenitors (GMPs), or early thymic progenitors led to LC generation within 2 to 3 weeks. CMPs were at least 20 times more efficient at generating LCs than CLPs. LCs from both lineages were derived almost entirely from fetal liver kinase-2+ (Flk-2+) progenitors, displayed typical dendritic-cell (DC) morphology, and showed long-term persistence in the skin. These results indicate that LCs are derived mainly from myeloid progenitors and are dependent on Flt3-ligand for their development.
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Affiliation(s)
- Ines Mende
- Stanford Blood Center, 3373 Hillview Ave, Palo Alto, CA 94304, USA.
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Gordon KB, Bonish BK, Patel T, Leonardi CL, Nickoloff BJ. The tumour necrosis factor-alpha inhibitor adalimumab rapidly reverses the decrease in epidermal Langerhans cell density in psoriatic plaques. Br J Dermatol 2005; 153:945-53. [PMID: 16225604 DOI: 10.1111/j.1365-2133.2005.06816.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND The pathophysiology of psoriasis is poorly understood, and the mechanism of action of biological agents interfering with tumour necrosis factor (TNF)-alpha that improve psoriatic plaques is completely unknown. OBJECTIVES To begin to unravel the mechanism of action, cellular changes occurring in plaques following administration of adalimumab, a humanized monoclonal antibody against TNF-alpha, were investigated. METHODS Thirteen different patients underwent sequential biopsies as part of a clinical trial. Each biopsy was immunostained and evaluated to calculate the relative density of epidermal Langerhans cells (LCs) before and after treatment (days 2, 7, 28, 84). To explore the basis for reduced epidermal LC densities in plaques, a SCID-Hu animal model was utilized. Acute psoriatic lesions were created within 2 weeks by injection of superantigen-activated CD4+ T cells into engrafted symptomless skin. RESULTS Compared with symptomless skin, untreated plaques had a significantly reduced density of epidermal LCs. There was a rapid increase in density of epidermal LCs in plaques following treatment with adalimumab beginning as early as day 7. The paucity of epidermal LCs in plaques was contrasted to the prominent density of LCs in other skin disorders with chronic inflammation and alterations in keratinization, including lichen planus and inflamed seborrhoeic keratosis. Rapid creation of plaques using the SCID-Hu model was accompanied by loss of epidermal LCs, indicating that diminished LC density occurs at an early stage of lesion formation. CONCLUSIONS These data shed light on a new immunopathological perspective highlighting a rapid loss of epidermal LCs in acute psoriatic lesions, with sustained decreased density of LCs in chronic plaques. Furthermore, an unexpected insight into the mechanism of action was uncovered for adalimumab, in which rapid restoration of epidermal LC density was observed.
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Affiliation(s)
- K B Gordon
- Department of Internal Medicine, Division of Dermatology, Loyola University Medical Center, Maywood, IL 60153, USA
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Gottlieb AB, Chamian F, Masud S, Cardinale I, Abello MV, Lowes MA, Chen F, Magliocco M, Krueger JG. TNF Inhibition Rapidly Down-Regulates Multiple Proinflammatory Pathways in Psoriasis Plaques. THE JOURNAL OF IMMUNOLOGY 2005; 175:2721-9. [PMID: 16081850 DOI: 10.4049/jimmunol.175.4.2721] [Citation(s) in RCA: 280] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The mechanisms of action of marketed TNF-blocking drugs in lesional tissues are still incompletely understood. Because psoriasis plaques are accessible to repeat biopsy, the effect of TNF/lymphotoxin blockade with etanercept (soluble TNFR) was studied in ten psoriasis patients treated for 6 months. Histological response, inflammatory gene expression, and cellular infiltration in psoriasis plaques were evaluated. There was a rapid and complete reduction of IL-1 and IL-8 (immediate/early genes), followed by progressive reductions in many other inflammation-related genes, and finally somewhat slower reductions in infiltrating myeloid cells (CD11c+ cells) and T lymphocytes. The observed decreases in IL-8, IFN-gamma-inducible protein-10 (CXCL10), and MIP-3alpha (CCL20) mRNA expression may account for decreased infiltration of neutrophils, T cells, and dendritic cells (DCs), respectively. DCs may be less activated with therapy, as suggested by decreased IL-23 mRNA and inducible NO synthase mRNA and protein. Decreases in T cell-inflammatory gene expression (IFN-gamma, STAT-1, granzyme B) and T cell numbers may be due to a reduction in DC-mediated T cell activation. Thus, etanercept-induced TNF/lymphotoxin blockade may break the potentially self-sustaining cycle of DC activation and maturation, subsequent T cell activation, and cytokine, growth factor, and chemokine production by multiple cell types including lymphocytes, neutrophils, DCs, and keratinocytes. This results in reversal of the epidermal hyperplasia and cutaneous inflammation characteristic of psoriatic plaques.
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Affiliation(s)
- Alice B Gottlieb
- Clinical Research Center, University of Medicine and Dentistry of New Jersey -Robert Wood Johnson Medical School, New Brunswick, NJ 08901, USA.
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Abstract
Modulation of the complex process of wound-healing remains a surgical challenge. Little improvement beyond controlling infection, gentle tissue handling, and debridement of necrotic tissue has been had in the modern era. However, increasing appreciation of the process from a biomolecular perspective offers the potential for making significant strides in wound modulation. The bioactive molecule nitric oxide was found to have wide-ranging impact on cellular activities, including the cellular responses engendered by wound healing. Current research suggests that nitric oxide and several nitric oxide donors can exert biologic effects, although the particular net responses of cells contributing to wound repair are context-dependent.
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Affiliation(s)
- Jeff S Isenberg
- Laboratory of Pathology, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892-1500, USA.
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18
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Abstract
There is much evidence to support the concept that psoriasis is a type 1 autoimmune disease, primarily mediated by interferon gamma and other inflammatory cytokines. There has been renewed interest in the role of components of the innate immune system, however,and it may be that overlap between the innate and acquired arms of the immune system can better explain immunopathogenesis in psoriasis. Relevant cell types, receptors, and immune mediators within these traditional boundaries of the immune system are discussed.Finally, pathogenic contributions from important psoriatic mouse models and recent genomic data using the new gene chip technology are elaborated.
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Affiliation(s)
- Michelle A Lowes
- Rockefeller University, 1230 York Avenue, Box 178, New York, NY 10021, USA
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19
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Lew W, Bowcock AM, Krueger JG. Psoriasis vulgaris: cutaneous lymphoid tissue supports T-cell activation and ‘Type 1’ inflammatory gene expression. Trends Immunol 2004; 25:295-305. [PMID: 15145319 DOI: 10.1016/j.it.2004.03.006] [Citation(s) in RCA: 220] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Wook Lew
- Department of Dermatology, Yonsei University College of Medicine, Yongdong Severance Hospital, 146-29 Dogok-Dong, Kangman-Ku, Seoul, South Korea
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20
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Bayry J, Thirion M, Delignat S, Misra N, Lacroix-Desmazes S, Kazatchkine MD, Kaveri SV. Dendritic cells and autoimmunity. Autoimmun Rev 2004; 3:183-7. [PMID: 15110229 DOI: 10.1016/s1568-9972(03)00104-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2003] [Accepted: 07/27/2003] [Indexed: 02/04/2023]
Abstract
Dendritic cells (DC) are professional antigen-presenting cells that are specialized in the uptake of antigens and their transport from peripheral tissues to the lymphoid organs. Because of their capacity to stimulate naive T cells, DC have a central role in the initiation of primary immune responses and are considered promising tools and targets for immunotherapy. Emerging data suggest a role for DC in initiating autoimmune attacks. Direct analysis of DC phenotypes and DC-T-cell interactions in rodent and human autoimmune diseases should shed light on how pathogenesis occurs, and suggest novel avenues of treatment aimed at alleviating deviant DC function.
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Affiliation(s)
- Jagadeesh Bayry
- INSERM U430 and Université Pierre et Marie Curie, Institut des Cordeliers, 15 rue de l'Ecole de Médecine, Paris 75006, France
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21
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Cruz MT, Gonçalo M, Figueiredo A, Carvalho AP, Duarte CB, Lopes MC. Contact sensitizer nickel sulfate activates the transcription factors NF-kB and AP-1 and increases the expression of nitric oxide synthase in a skin dendritic cell line. Exp Dermatol 2004; 13:18-26. [PMID: 15009112 DOI: 10.1111/j.0906-6705.2004.00105.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nuclear factor kappa B (NF-kB) and activating protein-1 (AP-1) transcription factors are ubiquitously expressed signaling molecules known to regulate the transcription of a large number of genes involved in immune responses, namely the inducible isoform of nitric oxide synthase (iNOS). In this study, we demonstrate that a fetal skin-derived dendritic cell line (FSDC) produces nitric oxide (NO) in response to the contact sensitizer nickel sulfate (NiSO(4)) and increases the expression of the iNOS protein, as determined by immunofluorescence and Western blot analysis. The sensitizer NiSO(4) increased cytoplasmic iNOS expression by 31.9 +/- 10.3% and nitrite production, as assayed by the Griess reaction, by 27.6 +/- 9.5%. Electrophoretic mobility shift assay (EMSA), showed that 30 min of FSDC exposure to NiSO(4) activates the transcription factor NF-kB by 58.2 +/- 7.0% and 2 h of FSDC exposure to NiSO(4) activates the transcription factor AP-1 by 26.0 +/- 1.4%. Together, these results indicate that NiSO(4) activates the NF-kB and AP-1 pathways and induces iNOS expression in skin dendritic cells.
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Affiliation(s)
- M Teresa Cruz
- Faculdade de Farmácia, Centro de Neurociências e Biologia Celular, Universidade de Coimbra, 3004-517 Coimbra, Portugal.
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22
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Gottlieb AB. Novel immunotherapies for psoriasis: clinical research delivers new hope for patients and scientific advances. J Investig Dermatol Symp Proc 2004; 9:79-83. [PMID: 14870991 DOI: 10.1111/j.1087-0024.2004.00831.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/28/2023]
Abstract
Immunobiologics provide the hope for safe and effective long-term management of psoriasis, a life-disabling condition. The use of targeted immunotherapies as pathogenic probes has led to scientific discoveries that help uncover new information on the pathogenesis of psoriasis and on the control of cutaneous immunity. The research described in this paper employs targeted immunotherapies as pathogenic probes of T1-mediated immune disorders, using psoriasis as the primary disease model. This approach has wide applicability to other immune-mediated inflammatory isorders.
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Affiliation(s)
- Alice B Gottlieb
- Clinical Research Center, UMDNJ-Robert Wood Johnson Medical School, New Brunswick, New Jersey 08901-0019, USA.
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23
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Abstract
This review summarizes the use of inflximab in psoriasis and other immune-mediated inflammatory disorders (IMIDs). The magnitude and speed of the response to infliximab monotherapy of moderate to severe psoriasis vulgaris is substantial, being similar to those achieved with cyclosporin. In contrast with cyclosporin, clinical improvement after the initial 3 intravenous influsions of infliximab is maintained for as long as 6 months in approximately half the patients with the absence of any additional treatment. Additionally, infliximab monotherapy normalizes keratinocyte proliferation and differentiation and markedly decreases epidermal inflammation. These results provide a convincing argument for the role of TNF-alpha in the pathogenesis of psoriasis and for the clinical development of infliximab for the treatment of psoriasis.
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Affiliation(s)
- Alice B Gottlieb
- Clinical Research Center, UMDNJ-Robert Wood Johnson Medical School, 51 French Street, New Brunswick, NJ 08901-0019, USA
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24
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Vital AL, Gonçalo M, Cruz MT, Figueiredo A, Duarte CB, Lopes MC. Dexamethasone prevents granulocyte-macrophage colony-stimulating factor-induced nuclear factor-kappaB activation, inducible nitric oxide synthase expression and nitric oxide production in a skin dendritic cell line. Mediators Inflamm 2003; 12:71-8. [PMID: 12775356 PMCID: PMC1781603 DOI: 10.1080/0962935031000097673] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
AIMS Nitric oxide (NO) has been increasingly implicated in inflammatory skin diseases, namely in allergic contact dermatitis. In this work, we investigated the effect of dexamethasone on NO production induced by the epidermal cytokine granulocyte-macrophage colony-stimulating factor (GM-CSF) in a mouse fetal skin dendritic cell line. METHODS NO production was assessed by the method of Griess. Expression of the inducible isoform of nitric oxide synthase (iNOS) protein was evaluated by western blot analysis and immunofluorescence microscopy. Western blot analysis was also performed to evaluate cytosolic IkappaB-alpha (IkappaB-alpha) protein levels. The electrophoretic mobility shift assay was used to evaluate the activation or inhibition of nuclear factor kappa B (NF-kappaB). RESULTS GM-CSF induced iNOS expression and NO production, and activated the transcription factor NF-kappaB. Dexamethasone inhibited, in a dose-dependent manner, NO production induced by GM-CSF. Addition of dexamethasone to the culture, 30 min before GM-CSF stimulation, significantly inhibited the cellular expression of iNOS. Dexamethasone also inhibited GM-CSF-induced NF-kappaB activation by preventing a significant decrease on the IkappaB-alpha protein levels, thus blocking NF-kappaB migration to the nucleus. CONCLUSIONS The corticosteroid dexamethasone inhibits GM-CSF-induced NF-kappaB activation, iNOS protein expression and NO production. These results suggest that dexamethasone is a potent inhibitor of intracellular events that are involved on NO synthesis, in skin dendritic cells.
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Affiliation(s)
- Ana Luísa Vital
- Faculdade de Farmácia, Universidad de Coimbra, Coimbra, Portugal
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25
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26
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Sur R, Heck DE, Mariano TM, Jin Y, Murphy WJ, Laskin JD. UVB light suppresses nitric oxide production by murine keratinocytes and macrophages. Biochem Pharmacol 2002; 64:1469-81. [PMID: 12417260 DOI: 10.1016/s0006-2952(02)01419-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Nitric oxide is an important mediator of excessive cell growth and inflammation associated with many epidermal proliferative disorders. It is a highly reactive oxidant generated in keratinocytes and macrophages via the inducible form of the enzyme nitric oxide synthase (NOS2). In the present studies, we examined the effects of ultraviolet light (UVB, 2.5-25mJ/cm(2)) on interferon-gamma (IFN-gamma)-induced expression of NOS2 in these cells. Transient transfection assays using wild-type and mutant NOS2 promoter/luciferase reporter constructs showed that DNA binding of the transcription factors Stat1 and NF-kappaB was essential for optimal expression of the NOS2 gene. Whereas NF-kappaB was constitutively expressed in both cell types, Stat1 phosphorylation and nuclear binding activity were dependent upon IFN-gamma. UVB light, which is used therapeutically to treat inflammatory dermatosis, was found to suppress IFN-gamma-induced expression of NOS2 mRNA and protein, and nitric oxide production in both keratinocytes and macrophages. In macrophages, this was associated with complete inhibition of NF-kappaB nuclear binding activity and partial (approximately 20-25%) reduction of Stat1 activity. In keratinocytes, both responses were partially reduced at the highest doses of UVB light (15-25mJ/cm(2)). Whereas in macrophages UVB light suppressed NOS2 wild-type promoter-luciferase reporter activity, this activity was stimulated in keratinocytes. These data suggest that UVB light functions to suppress NOS2 gene expression in macrophages by inhibiting the activity of key regulatory transcription factors. In contrast, in keratinocytes, inhibition occurs downstream of NOS2 promoter activity.
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Affiliation(s)
- Runa Sur
- Department of Pharmacology and Toxicology, Rutgers University, Piscataway, NJ 08854, USA
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27
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Most D, Efron DT, Shi HP, Tantry US, Barbul A. Characterization of incisional wound healing in inducible nitric oxide synthase knockout mice. Surgery 2002; 132:866-76. [PMID: 12464872 DOI: 10.1067/msy.2002.127422] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
BACKGROUND Excisional wound healing in inducible nitric oxide synthase knockout (iNOS-KO) mice has been previously shown to be impaired compared with their background strain controls. Incisional wounds were created in this experiment in both types of animals and paradoxically were found to heal with the same rapidity and breaking strength in both groups. METHODS Dorsal 2.5 cm incisional wounds were created in iNOS-KO mice, as well as their parental strain controls (C57BL/6J). Standardized polyvinyl alcohol sponges were implanted in the wounds to allow for measurement of collagen deposition. Animals were harvested on postoperative days (PODs) 3, 5, 7, 10, 14, and 28, and their wounds subjected to tensiometric breaking strength analysis. Nonisotopic in situ hybridization quantitative analysis for iNOS, endothelial NOS (eNOS), basic fibroblast growth factor (bFGF), transforming growth factor-beta1 (TGF-beta1), vascular endothelial growth factor (VEGF), and interleukin-4 (IL-4) expression in the wounds was performed. Hydroxyproline levels were quantitated in the harvested polyvinyl alcohol sponges. Data were analyzed with the Students t test. RESULTS No significant differences were found in breaking strengths or levels of hydroxyproline (and thus collagen) in iNOS-KO versus wild-type wounds at all tested time points. Flawed iNOS expression levels in iNOS-KO animals were similar to (functional) iNOS expression in wild-types. eNOS and bFGF expression nearly doubled on POD 7 in iNOS-KO incisions (P =.002, and.002), respectively and remained 200% to 300% elevated thereafter. TGF-beta1 expression was increased approximately 50% to 100% in iNOS-KO wounds on PODs 5 and 7 (P =.006 and.01, respectively). VEGF and IL-4 expression was elevated by 25% to 100% in wild-type compared with iNOS-KO animals at all time points (P <.01). CONCLUSIONS The overexpression of TGF-beta1 and eNOS may represent mechanisms in iNOS-KO mice to compensate for their loss of functional iNOS, resulting in incisional wound healing equivalent to controls. Their impaired expression of VEGF and IL-4, on the other hand, may partially explain the delayed excisional wound healing noted in these animals.
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Affiliation(s)
- Daniel Most
- Departments of Surgery, the Johns Hopkins Medical Institutions, and the Sinai Hospital of Baltimore, Baltimore, MD 21215, USA
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28
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Blesson S, Thiery J, Gaudin C, Stancou R, Kolb JP, Moreau JL, Theze J, Mami-Chouaib F, Chouaib S. Analysis of the mechanisms of human cytotoxic T lymphocyte response inhibition by NO. Int Immunol 2002; 14:1169-78. [PMID: 12356682 DOI: 10.1093/intimm/dxf081] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
NO is a potent cellular mediator which has been shown to modulate several immune mechanisms. Using human T lymphocytes as responder cells in a primary mixed lymphocyte reaction, we demonstrated that, at the initiation of the culture, exogenously provided NO via sodium nitroprusside, in non-toxic concentrations, inhibited both allogeneic proliferative and primary cytotoxic responses in a dose-dependent manner. In contrast, it had no effect on the cytotoxic activity of established human TCR (alpha)beta and TCR (gamma)delta cytotoxic T lymphocyte (CTL) clones. The NO inhibitory effect on primary cytotoxic T cell response correlates with inhibition of T cell blastogenesis. Furthermore, under our stimulation conditions, NO induced an inhibition of IL-2 production, an alteration of IL-2R(alpha) expression, and a down-regulation of NF-AT translocation in CD4(+) and CD8(+)allostimulated T cells. Furthermore, we demonstrate that the inhibition of allospecific CTL activity by the NO donor was at least in part related to an inhibition of granzyme B and Fas ligand transcription as revealed respectively by RNase protection and RT-PCR analysis. These results suggest that NO may function to fine tune human CD3(+) T cell activation and subsequent CTL generation.
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Affiliation(s)
- Séverine Blesson
- INSERM U487 Cytokines et Immunologie des Tumeurs Humaines, IFR 54 Bases Moléculaires et Cellulaires de Stratégies Nouvelles en Cancérologie, Institut Gustave Roussy, 39 rue Camille Desmoulins, 94805 Villejuif Cedex, France
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29
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Yu Y, Tang L, Wang J, Liu S, Wang W, An H, Qi R, Zhang M, Cao X. Psoriatic lesional keratinocytes promote the maturation of human monocyte-derived Langerhans cells. Dermatology 2002; 204:94-9. [PMID: 11937732 DOI: 10.1159/000051824] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Langerhans cells (LCs) are important antigen-presenting cells in the epidermis and may play a key role in the pathogenesis of psoriasis. It has been proven that LCs isolated from psoriatic lesions are abnormal. However, the mechanism of the abnormality has not been reported so far. OBJECTIVE In the present study, we investigated the effect of psoriatic lesional keratinocytes on the maturation of LCs. METHODS Monocytes isolated from healthy peripheral blood could differentiate into LCs in the presence of granulocyte-macrophage colony-stimulating factor, interleukin (IL) 4 and transforming growth factor beta1 for 5 days. Then, human monocyte-derived LCs were cultured with supernatants from psoriatic lesional keratinocytes for another 2 days. Their phenotypes and phagocytic capacity were analyzed by flow cytometry. IL-12 secreted by LCs was determined by ELISA. RESULTS Supernatants from psoriatic lesional keratinocytes could up-regulate the expression of HLA-DR and CD86 on LCs more significantly than supernatants from healthy keratinocytes, but less powerfully than lipopolysaccharide. The levels of IL-12 secreted by LCs also increased. In contrast, the expression of CD1a on LCs and their phagocytic capacity were reduced. CONCLUSION Human monocyte-derived LCs cultured with supernatants from psoriatic lesional keratinocytes displayed the characteristics of maturation. This suggests that psoriatic lesional keratinocytes might secrete some factors that could promote the maturation of LCs, which may play important roles in immune reactions related to psoriasis.
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Affiliation(s)
- Yizhi Yu
- Institute of Immunology, Second Military Medical University, Shanghai, China
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30
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Virág L, Szabó E, Bakondi E, Bai P, Gergely P, Hunyadi J, Szabó C. Nitric oxide-peroxynitrite-poly(ADP-ribose) polymerase pathway in the skin. Exp Dermatol 2002; 11:189-202. [PMID: 12102657 DOI: 10.1034/j.1600-0625.2002.110301.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
In the last decade it has become well established that in the skin, nitric oxide (NO), a diffusable gas, mediates various physiologic functions ranging from the regulation of cutaneous blood flow to melanogenesis. If produced in excess, NO combines with superoxide anion to form peroxynitrite (ONOO-), a cytotoxic oxidant that has been made responsible for tissue injury during shock, inflammation and ischemia-reperfusion. The opposite effects of NO and ONOO- on various cellular processes may explain the 'double-edged sword' nature of NO depending on whether or not cellular conditions favour peroxynitrite formation. Peroxynitrite has been shown to activate the nuclear nick sensor enzyme, poly(ADP-ribose) polymerase (PARP). Overactivation of PARP depletes the cellular stores of NAD+, the substrate of PARP, and the ensuing 'cellular energetic catastrophy' results in necrotic cell death. Whereas the role of NO in numerous skin diseases including wound healing, burn injury, psoriasis, irritant and allergic contact dermatitis, ultraviolet (UV) light-induced sunburn erythema and the control of skin infections has been extensively documented, the intracutaneous role of peroxynitrite and PARP has not been fully explored. We have recently demonstrated peroxynitrite production, DNA breakage and PARP activation in a murine model of contact hypersensitivity, and propose that the peroxynitrite-PARP route represents a common pathway in the pathomechanism of inflammatory skin diseases. Here we briefly review the role of NO in skin pathology and focus on the possible roles played by peroxynitrite and PARP in various skin diseases.
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Affiliation(s)
- László Virág
- Department of Medical Chemistry, Faculty of Medicine, University of Debrecen, Debrecen, Hungary.
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31
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Schmuth M, Neyer S, Rainer C, Grassegger A, Fritsch P, Romani N, Heufler C. Expression of the C-C chemokine MIP-3 alpha/CCL20 in human epidermis with impaired permeability barrier function. Exp Dermatol 2002; 11:135-42. [PMID: 11994140 DOI: 10.1034/j.1600-0625.2002.110205.x] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
External assault to the skin is followed by an epidermal response including synthesis of DNA, lipids, cytokines and migration of antigen presenting cells. MIP-3 alpha (CCL20, LARC, Exodus-1, Scya20) is a recently described C-C chemokine, predominantly expressed in extralymphoid tissue, which is known to direct migration of dendritic cell precursors and memory lymphocytes to sites of antigen invasion. We assessed the expression of MIP-3 alpha in human skin using semi-quantitative polymerase chain reaction. In vivo, MIP-3 alpha mRNA was constitutively expressed at low levels in untreated human epidermis. After acute disruption of the epidermal permeability barrier MIP-3 alpha mRNA was upregulated in the epidermal fraction, whereas dermal MIP-3 alpha mRNA levels remained unchanged. In vitro, MIP-3 alpha was increased in cultured keratinocytes treated with IL-1 alpha and TNF-alpha and was present in immature and mature dendritic cells, THP-1 monocytic cells and activated T cells. Finally, skin biopsies from patients with psoriasis, contact dermatitis and mycosis fungoides showed abundant expression. In biopsies from atopic dermatitis and graft vs. host disease a weak signal was present, whereas no expression was found in scleroderma and toxic epidermal necrolysis. We conclude that regulation of MIP-3 alpha mRNA is part of the epidermal response to external assault. Its upregulation may represent a danger signal for increased immunosurveillance in barrier disrupted skin and inflammatory skin conditions with impaired barrier function to counteract potential antigen invasion.
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Affiliation(s)
- M Schmuth
- Departments of Dermatology, University of Innsbruck, Innsbruck, Austria.
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32
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Cruz MT, Duarte CB, Gonçalo M, Figueiredo A, Carvalho AP, Lopes MC. Granulocyte-macrophage colony-stimulating factor activates the transcription of nuclear factor kappa B and induces the expression of nitric oxide synthase in a skin dendritic cell line. Immunol Cell Biol 2001; 79:590-6. [PMID: 11903618 DOI: 10.1046/j.1440-1711.2001.01041.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Nitric oxide (NO) produced by skin dendritic cells and keratinocytes plays an important role in skin physiology, growth and remodelling. Nitric oxide is also involved in skin inflammatory processes and in modulating antigen presentation (either enhancing or suppressing it). In this study, we found that GM-CSF stimulates the expression of the inducible isoform of nitric oxide synthase (iNOS) in a fetal-skin-derived dendritic cell line (FSDC) and, consequently, increases the nitrite production from 11.9 +/- 3.2 micromol/L (basal level) to 26.9 +/- 4.2 micromol/L. Pyrrolidinedithiocarbamate (PDTC) inhibits nitrite production, with a half maximal inhibitory concentration (IC50) of 19.3 micromol/L and the iNOS protein expression in FSDC. In addition, western blot assays revealed that exposure of FSDC to GM-CSF induces the phosphorylation and degradation of the inhibitor of NF-kappaB (IkB), with subsequent translocation of the p50, p52 and RelB subunits of the transcription nuclear factor kappa B (NF-kappaB) from the cytosol to the nucleus. Electrophoretic mobility shift assays (EMSA) showed that FSDC exposure to GM-CSF activates the transcription factor NF-kappaB. Together, these results show that GM-CSF induces iNOS expression in skin dendritic cells by a mechanism involving activation of the NF-kappaB pathway.
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Affiliation(s)
- M T Cruz
- Faculdade de Farmácia, Universidade de Coimbra, Portugal
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33
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Vural P, Erzengin D, Canbaz M, Selçuki D. Nitric oxide and endothelin-1,2 in actinic keratosis and basal cell carcinoma: changes in nitric oxide/endothelin ratio. Int J Dermatol 2001; 40:704-8. [PMID: 11737437 DOI: 10.1046/j.1365-4362.2001.01249.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
BACKGROUND Nitric oxide (NO) is an inorganic free radical gas which has cytostatic/cytotoxic actions in tumoral tissues, including gynecologic, breast, and colon cancer. Nitric oxide is also a multifunctional signaling molecule active in many cells of the body, including endothelial cells, macrophages, monocytes, hepatocytes, mast cells, osteoblasts, and astrocytes. Endothelin-1 (ET-1) is a 21-amino acid peptide that stimulates the proliferation of vascular smooth muscle cells, fibroblasts, and keratinocytes, and plays a role in the expression of proto-oncogenes (c-myc, c-fos), which precedes cell proliferation. Similar to NO, ET is secreted by different cell types, including macrophages, monocytes, hepatocytes, endothelial cells, vascular smooth muscle cells, and various tumor cells. Elevated ET-1 levels are observed in pulmonary, hepatocellular, and prostate cancers. Actinic keratosis (AK) and basal cell carcinoma (BCC) are common skin tumors with accentuated hyperkeratinization, hyperpigmentation, and keratinocyte proliferation. AIM To investigate plasma NOx (nitrite/nitrate -- the end products of NO metabolism), ET, and the NOx/ET ratio in patients with AK and BCC in comparison with healthy controls. METHODS NOx, ET, and the NOx/ET ratio were measured in 13 patients with AK, 12 patients with BCC, and in 16 healthy controls. RESULTS Data analysis indicated a significant increase in plasma NOx, ET, and NOx/ET values in BCC patients in comparison with controls (P < 0.001, P < 0.05 and P < 0.001, respectively). Plasma ET levels in AK were also increased in comparison with controls (P < 0.001). When the two study groups (AK and BCC) were compared, a significant increase (P < 0.001) in the NOx/ET ratio in BCC was found. CONCLUSIONS The increased plasma ET and NOx levels in AK and, especially, BCC are probably the result of and/or reason for the accentuated hyperkeratinization, hyperpigmentation, and keratinocyte proliferation. The increased production of ET and NO by keratinocytes may function as growth and cytotoxic factors and potential mitogens, and may accelerate further proliferation of these skin tumors. In addition, the increased NOx/ET ratio probably reflects a disturbed equilibrium between these two substances, leading to cell damage and tumor promotion and proliferation.
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Affiliation(s)
- P Vural
- Department of Biochemistry and Clinical Biochemistry, Istanbul Medical Faculty, Capa, Istanbul, Turkey
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34
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Most D, Efron DT, Shi HP, Tantry US, Barbul A. Differential cytokine expression in skin graft healing in inducible nitric oxide synthase knockout mice. Plast Reconstr Surg 2001; 108:1251-9. [PMID: 11604628 DOI: 10.1097/00006534-200110000-00024] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Inducible nitric oxide synthase (iNOS) and its product, nitric oxide, have been shown to play important roles in wound biology. The present study was performed to investigate the role of iNOS in modulating the cytokine cascade during the complex process of skin graft wound healing.Fifteen iNOS-knockout mice and 15 wild-type C57BL/6J mice were subjected to autogenous 1-cm2 intrascapular full-thickness skin grafts. Three animals in each group were killed on postoperative days 3, 5, 7, 10, and 14. Specimens were then analyzed using nonisotopic in situ hybridization versus mRNA of tumor growth factor-beta1, vascular endothelial growth factor, iNOS, endothelial nitric oxide synthase (eNOS), tumor necrosis factor-alpha, and basic fibroblast growth factor, as well as positive and negative control probes. Positive cells in both grafts and wound beds were counted using a Leica microgrid. Scar thickness was measured with a Leica micrometer. Data were analyzed using the unpaired Student's t test. Expression of iNOS was 2- to 4-fold higher in knockout mice than in wild-type mice on postoperative days 5, 7, and 14. Expression of eNOS was 2- to 2.5-fold higher in knockout mice than in wild-type mice on postoperative days 5 and 7. Tumor necrosis factor-alpha expression was 2- to 7-fold higher in knockout mice than in wild-type mice on all postoperative days. In contrast, expression levels of angiogenic/fibrogenic cytokines (vascular endothelial growth factor, basis fibroblast growth factor, and tumor growth factor-beta1) were 2.5- to 4-fold higher in wild-type mice than in knockout mice. Scars were 1.5- to 2.5-fold thicker in knockout mice than in wild-type mice at all time points. All of the above results represent statistically significant differences (p < 0.05). Significantly different patterns of cytokine expression were seen in knockout and wild-type mice. Although the scar layer was thicker in knockout mice, it showed much greater infiltration with inflammatory cells. These data further delineate the modulatory effect of iNOS and nitric oxide in healing skin grafts.
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Affiliation(s)
- D Most
- Division of Plastic Surgery, Johns Hopkins Medical Institutions, Sinai Hospital of Baltimore, MD 21215, USA
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Cruz MT, Duarte CB, Gonçalo M, Carvalho AP, Lopes MC. LPS induction of I kappa B-alpha degradation and iNOS expression in a skin dendritic cell line is prevented by the janus kinase 2 inhibitor, Tyrphostin b42. Nitric Oxide 2001; 5:53-61. [PMID: 11178937 DOI: 10.1006/niox.2000.0320] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The Janus kinase (JAK) family of protein tyrosine kinases are activated in response to a wide variety of external stimuli. Here we have investigated whether the janus kinase 2 (JAK2) is involved in the induction of nitric oxide synthase type II (iNOS) expression in a mouse fetal skin dendritic cell line (FSDC). In FSDC the expression of iNOS protein and nitric oxide production, in response to the lipopolysaccharide (LPS) stimulus (5 microg/ml), is inhibited by the specific inhibitor of the JAK2, tyrphostin B42 with an half maximal inhibitory concentration (IC(50)) of 9.65 microM. The antioxidant compound pyrrolidinedithiocarbamate (PDTC) inhibits both the nitrite production with an IC(50) of 16.6 microM and the iNOS protein expression in FSDC. In addition, LPS induces the activation of NF-kappa B, and tyrphostin B42 prevents the degradation of the cytosolic factor I kappa B-alpha and blocks the translocation of the NF-kappa B p65 protein subunit into the nucleus. These results indicate that the JAK family of protein kinases and the transcription factor NF-kappa B are involved in the induction of iNOS protein expression in FSDC stimulated with LPS.
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Affiliation(s)
- M T Cruz
- Faculdade de Farmácia, Universidade de Coimbra, 3000 Coimbra, Portugal
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Abstract
Abstract
Langerhans cells (LCs) are specialized dendritic cells (DCs) strategically located in stratified epithelia, such as those of the skin, oral cavity, pharynx, esophagus, upper airways, urethra, and female reproductive tract, which are exposed to a wide variety of microbial pathogens. LCs play an essential role in the induction of T-lymphocyte responses against viruses, bacteria, and parasites that gain access to those epithelial surfaces, due to their high antigen capture and processing potential and their capacity to present antigen peptides to T cells on migration to the lymph nodes.1Although LCs have been classically considered of myeloid origin, recent reports, which demonstrate the existence of lymphoid DCs derived from multipotent lymphoid precursors devoid of myeloid differentiation potential,2–5 raise the question of the lymphoid or myeloid origin of LCs. The present study shows that mouse lymphoid-committed CD4low precursors, with the capacity to generate T cells, B cells, CD8+ lymphoid DCs, and natural killer cells,26 also generate epidermal LCs on intravenous transfer, supporting the view that LCs belong to the lymphoid lineage.
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Abstract
Langerhans cells (LCs) are specialized dendritic cells (DCs) strategically located in stratified epithelia, such as those of the skin, oral cavity, pharynx, esophagus, upper airways, urethra, and female reproductive tract, which are exposed to a wide variety of microbial pathogens. LCs play an essential role in the induction of T-lymphocyte responses against viruses, bacteria, and parasites that gain access to those epithelial surfaces, due to their high antigen capture and processing potential and their capacity to present antigen peptides to T cells on migration to the lymph nodes.1Although LCs have been classically considered of myeloid origin, recent reports, which demonstrate the existence of lymphoid DCs derived from multipotent lymphoid precursors devoid of myeloid differentiation potential,2–5 raise the question of the lymphoid or myeloid origin of LCs. The present study shows that mouse lymphoid-committed CD4low precursors, with the capacity to generate T cells, B cells, CD8+ lymphoid DCs, and natural killer cells,26 also generate epidermal LCs on intravenous transfer, supporting the view that LCs belong to the lymphoid lineage.
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Abstract
Nitric oxide is a short-lived free radical, that is capable of multiple effects at the molecular, cellular, and physiologic levels. Over the past several years, nitric oxide has been proved to play an important role in the healing of various types of wounds. The present review examines some of the recently defined roles of nitric oxide in normal and pathologic healing.
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Affiliation(s)
- D T Efron
- Department of Surgery, Sinai Hospital of Baltimore, Maryland 21215, USA
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Ormerod AD, Copeland P, Shah SA. Treatment of psoriasis with topical NG-monomethyl-L-arginine, an inhibitor of nitric oxide synthesis. Br J Dermatol 2000; 142:985-90. [PMID: 10809860 DOI: 10.1046/j.1365-2133.2000.03483.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A double blind left, right comparative study was carried out in 17 psoriatic subjects to examine the influence of a topically applied inhibitor of nitric oxide (NO) synthesis on the pathogenic events of psoriasis. The inhibitor NG-monomethyl-L-arginine (L-NMMA) in aqueous cream BP was applied to one plaque while aqueous cream BP alone served as control. Compared with the control, the L-NMMA-treated side showed significant (77%) inhibition of NO production and a reduction in blood flow, confirming its bioavailability. L-NMMA significantly reduced staining for endothelial cells and intercellular adhesion molecule 1, while CD1a-positive Langerhans cells and CD8-positive suppressor cytotoxic T cells increased. CD4-positive lymphocytes and epidermal proliferation, as indicated by Ki-67 staining, were unaffected by this degree of inhibition of NO synthesis, and correspondingly significant clinical improvement was not found.
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Affiliation(s)
- A D Ormerod
- Department of Dermatology, Aberdeen Royal Infirmary, Foresterhill, Aberdeen, AB25 2ZN, U.K.
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Zamora R, Vodovotz Y, Billiar TR. Inducible Nitric Oxide Synthase and Inflammatory Diseases. Mol Med 2000. [DOI: 10.1007/bf03401781] [Citation(s) in RCA: 158] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
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Trepicchio WL, Ozawa M, Walters IB, Kikuchi T, Gilleaudeau P, Bliss JL, Schwertschlag U, Dorner AJ, Krueger JG. Interleukin-11 therapy selectively downregulates type I cytokine proinflammatory pathways in psoriasis lesions. J Clin Invest 1999; 104:1527-37. [PMID: 10587516 PMCID: PMC409858 DOI: 10.1172/jci6910] [Citation(s) in RCA: 159] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Psoriasis is a chronic inflammatory skin disease in which epidermal hyperplasia results from skin infiltration by type I T lymphocytes and release of associated cytokines. A multifunctional cytokine, rhIL-11, modulates macrophage and type I T-lymphocyte function in cell culture and shows anti-inflammatory activity in animal models. We are testing subcutaneous delivery of rhIL-11 to patients with psoriasis in a phase 1 open-label dose-escalation clinical trial. Tissue was obtained from lesional and uninvolved skin before and during treatment with rhIL-11 and was examined by histology/immunohistochemistry and quantitative RT-PCR. Expression of over 35 genes was examined in all patients, and multiple genetic markers of psoriasis were identified. Expression of numerous proinflammatory genes was elevated in psoriatic tissue compared with nonlesional skin. Seven of 12 patients responded well to rhIL-11 treatment. Amelioration of disease by rhIL-11, as shown by reduced keratinocyte proliferation and cutaneous inflammation, was associated with decreased expression of products of disease-related genes, including K16, iNOS, IFN-gamma, IL-8, IL-12, TNF-alpha, IL-1beta, and CD8, and with increased expression of endogenous IL-11. We believe that this is the first study in humans to indicate that type I cytokines can be selectively suppressed by an exogenous immune-modifying therapy. The study highlights the utility of pharmacogenomic monitoring to track patient responsiveness and to elucidate anti-inflammatory mechanisms.
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Affiliation(s)
- W L Trepicchio
- Department of Molecular Medicine, Genetics Institute, Cambridge, Massachusetts 01810, USA
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Esche C, Subbotin VM, Hunter O, Peron JM, Maliszewski C, Lotze MT, Shurin MR. Differential regulation of epidermal and dermal dendritic cells by IL-12 and Flt3 ligand. J Invest Dermatol 1999; 113:1028-32. [PMID: 10594747 DOI: 10.1046/j.1523-1747.1999.00779.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
An abrogation of the decline in epidermal Langerhans cell numbers above melanoma might significantly improve the efficacy of immunotherapy for melanoma treatment. Systemic Flt3 ligand (FL) administration in mice induced a significant increase in mature dendritic cells (DC) within the skin, preferentially in the dermis, whereas IL-12 promoted a significant increase of immature DC preferentially in the epidermis. Both effects were abrogated in IL-12 knockout mice. Thus, IL-12 could promote FL-induced accumulation of skin DC. The involvement of FL and IL-12 in the regulation of DC accumulation within the skin may contribute, at least in part, to the stimulation of antimelanoma immunity by FL- and IL-12-based immunotherapies. Moreover, FL and IL-12 could be used for selective in vivo generation of DC in either epidermis or dermis for experimental and clinical purposes.
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Affiliation(s)
- C Esche
- University of Pittsburgh Cancer Institute, Pennsylvania 15213, USA
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Kolb-Bachofen V, Bruch-Gerharz D. Langerhans cells, nitric oxide, keratinocytes and psoriasis. IMMUNOLOGY TODAY 1999; 20:289. [PMID: 10354555 DOI: 10.1016/s0167-5699(98)01411-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Yamamoto K, Akbar SM, Masumoto T, Onji M. Increased nitric oxide (NO) production by antigen-presenting dendritic cells is responsible for low allogeneic mixed leucocyte reaction (MLR) in primary biliary cirrhosis (PBC). Clin Exp Immunol 1998; 114:94-101. [PMID: 9764609 PMCID: PMC1905073 DOI: 10.1046/j.1365-2249.1998.00696.x] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The levels of blastogenesis in allogeneic MLR containing T cells from one normal volunteer and irradiated dendritic cells from 29 patients with PBC, 17 patients with chronic hepatitis type C (CH-C) and 22 allogeneic normal controls were compared to see if there is any role of antigen-presenting cells (APC) in the pathogenesis of PBC. The stimulatory capacity of dendritic cells from PBC was significantly lower compared with that of dendritic cells from CH-C (P < 0.05) and normal controls (P < 0.05), which could not be attributable either to the levels of expression of surface molecules, such as HLA-DR and CD86 on dendritic cells, or to the levels of cytokines, such as IL-10 and IL-12. Significantly higher levels of NO were seen in the allogeneic MLR supernatants containing dendritic cells from PBC compared with the supernatants from cultures containing dendritic cells from CH-C (P < 0.001) or normal controls (P < 0.001). Moreover, dendritic cells from PBC produced 10 times more NO compared with dendritic cells from CH-C and normal controls (21.9 +/- 2.8 microM versus 1.6 +/- 0.3 microM and 1.6 +/- 0.3 microM, respectively; P < 0.001). The addition of N(G)-monomethyl-L-arginine monoacetate (L-NMMA), a known inhibitor of NO in allogeneic MLR containing dendritic cells from PBC, resulted in a significant decrease of NO and increase of blastogenesis. The selective impairment of dendritic cell function, increased production of NO by dendritic cells and restoration of blastogenesis using NO inhibitor in PBC have suggested a role for NO and dysfunction of dendritic cells in the pathogenesis of PBC. This inspires optimism that modulating the function of dendritic cells and controlling NO production, an improved therapeutic approach, might be planned for PBC.
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Affiliation(s)
- K Yamamoto
- Third Department of Internal Medicine, Ehime University School of Medicine, Japan
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McKenzie RC, Weller R. Langerhans cells, keratinocytes, nitric oxide and psoriasis. IMMUNOLOGY TODAY 1998; 19:427-8. [PMID: 9745207 DOI: 10.1016/s0167-5699(98)01290-0] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Fleshner M, Nguyen KT, Cotter CS, Watkins LR, Maier SF. Acute stressor exposure both suppresses acquired immunity and potentiates innate immunity. THE AMERICAN JOURNAL OF PHYSIOLOGY 1998; 275:R870-8. [PMID: 9728086 DOI: 10.1152/ajpregu.1998.275.3.r870] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Acute stressor exposure alters immune function. Rats exposed to inescapable tail shock stress (IS) generate less antibody to a benign, antigenic protein, keyhole limpet hemocyanin (KLH). The following studies examined the effect of IS on peritoneal cavity, spleen, and mesenteric lymph node cell number, interferon-gamma (IFN-gamma) production, and nitrite production. Rats were injected intraperitoneally with KLH (200 microg) or saline immediately before IS exposure and killed 0, 48, and 96 h after IS termination. KLH immunization resulted in elevated cell numbers and IFN-gamma levels 2-4 days later in nonstressed control rats. In contrast, rats exposed to IS failed to increase cell number and IFN-gamma levels in response to KLH. The T cell subpopulations affected were CD4 T cells, specifically the Th1-like subset. In addition, in rats exposed to IS + KLH, nitrite production was potentiated 2-4 days after stressor termination. IS had little effect on these measures in saline-injected rats. These data support the conclusion that exposure to IS suppresses the expansion of anti-KLH lymphocytes, possibly anti-KLH Th1 cells. In addition, stressor exposure potentiates the production of nitrite. Importantly, this potentiated response occurred only in KLH-immunized animals, suggesting that macrophages may be primed by stressor exposure and thus respond more vigorously to antigen. The potential links between these changes are discussed.
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Affiliation(s)
- M Fleshner
- Department of Kinesiology and Applied Physiology, University of Colorado, Boulder, Colorado 80309, USA
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