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Psoriasis and dendritic cells

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https://www.readbyqxmd.com/read/29859222/acetyl-11-keto-%C3%AE-boswellic-acid-inhibits-the-secretion-of-cytokines-by-dendritic-cells-via-the-tlr7-8-pathway-in-an-imiquimod-induced-psoriasis-mouse-model-and-in-vitro
#1
Ming-Xing Wang, Jing-Xia Zhao, Yu-Jiao Meng, Ting-Ting Di, Xiao-Long Xu, Xiang-Jiang Xie, Yan Lin, Lu Zhang, Ning Wang, Ping Li, Yan Wang
AIMS: Psoriasis vulgaris is mediated by T and dendritic cells. This study aimed to investigate the effects of acetyl-11-keto-β-boswellic acid (AKBA) on activated dendritic cells (DCs) using an imiquimod (IMQ)-induced psoriasis-like mouse model and murine bone marrow-derived dendritic cells (BMDCs) stimulated with resiquimod (R848) in vitro. MATERIALS AND METHODS: The mice were treated with IMQ and intragastrically administered 25-100 mg/kg/day of AKBA, 1 mg/kg/day of methotrexate (MTX), or normal saline...
May 30, 2018: Life Sciences
https://www.readbyqxmd.com/read/29794016/il-36%C3%AE-from-skin-resident-cells-plays-an-important-role-in-the-pathogenesis-of-imiquimod-induced-psoriasiform-dermatitis-by-forming-a-local-autoamplification-loop
#2
Yuriko Hashiguchi, Rikio Yabe, Soo-Hyun Chung, Masanori A Murayama, Kaori Yoshida, Kenzo Matsuo, Sachiko Kubo, Shinobu Saijo, Yuumi Nakamura, Hiroyuki Matsue, Yoichiro Iwakura
IL-36α (gene symbol Il1f6 ), a member of the IL-36 family, is closely associated with inflammatory diseases, including colitis and psoriasis. In this study, we found that Il1f6 -/- mice developed milder psoriasiform dermatitis upon treatment with imiquimod, a ligand for TLR ligand 7 (TLR7) and TLR8, whereas Il1f6 -/- mice showed similar susceptibility to dextran sodium sulfate-induced colitis to wild-type mice. These effects were observed in both cohoused and separately housed conditions, and antibiotic treatment did not cancel the resistance of Il1f6 -/- mice to imiquimod-induced dermatitis...
May 23, 2018: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/29759005/ido-expressing-fibroblasts-suppress-the-development-of-imiquimod-induced-psoriasis-like-dermatitis
#3
Sanam Salimi Elizei, Mohammadreza Pakyari, Mehraneh Ghoreishi, Ruhangiz Kilani, Sanaz Mahmoudi, Aziz Ghahary
Psoriasis is a chronic skin condition whose pathogenesis is reported to be due to the activation of the interleukin-23/interleukin-17 (IL-23/IL-17) pathway. Here, we report that indoleamine 2,3-dioxygenase (IDO)-expressing fibroblasts reduce the activity of this pathway in activated immune cells. The findings showed that intralesional injection of IDO-expressing fibroblasts in imiquimod-induced psoriasis-like dermatitis on the back and ear (Pso. ear group) in mice significantly improves the clinical lesional appearance by reducing the number of skin-infiltrated IL-17+ CD4+ T cells (1...
January 1, 2018: Cell Transplantation
https://www.readbyqxmd.com/read/29729445/emerging-role-of-il-35-in-inflammatory-autoimmune-diseases
#4
REVIEW
Lin-Chong Su, Xiao-Yan Liu, An-Fang Huang, Wang-Dong Xu
Interleukin 35 (IL-35) is the recently identified member of the IL-12 family of cytokines and provides the possibility to be a target for new therapies for autoimmune, inflammatory diseases. It is composed of an α chain (p35) and a β chain (EBI3). IL-35 mediates signaling by binding to its receptors, activates subsequent signaling pathways, and therefore, regulates the differentiation, function of T, B cells, macrophages, dendritic cells. Recent findings have shown abnormal expression of IL-35 in inflammatory autoimmune diseases, such as systemic lupus erythematosus, rheumatoid arthritis, inflammatory bowel disease, multiple sclerosis, type 1 diabetes, psoriasis, multiple sclerosis, autoimmune hepatitis, experimental autoimmune uveitis...
May 3, 2018: Autoimmunity Reviews
https://www.readbyqxmd.com/read/29661487/ripk1-downregulation-in-keratinocyte-enhances-trail-signaling-in-psoriasis
#5
Nao Saito, Masaru Honma, Takashi Shibuya, Shin Iinuma, Satomi Igawa, Mari Kishibe, Akemi Ishida-Yamamoto
BACKGROUND: Psoriasis, a common inflammatory skin disorder characterized by scaly erythema and plaques, is induced by dysregulation of dendritic cell- and T cell-mediated immune reaction. Receptor-interacting protein kinase 1 (RIPK1) regulates inflammatory signaling in response to stimuli such as TNF-α, TRAIL, and TLRs, resulting in apoptosis, necroptosis and NF-κB activation. However, the physiological relevance in human epidermis remains elusive. OBJECTIVE: In this study, we examined whether RIPK1 is involved in the pathogenesis of psoriasis vulgaris...
April 10, 2018: Journal of Dermatological Science
https://www.readbyqxmd.com/read/29655588/resident-and-monocyte-derived-langerhans-cells-are-required-for-imiquimod-induced-psoriasis-like-dermatitis-model
#6
Minseok Lee, Sung Hee Kim, Tae-Gyun Kim, Jeyun Park, Jae Won Lee, Min-Geol Lee
BACKGROUND: Langerhans cells (LCs) are dendritic cells that reside in the epidermis and local inflammation results in an increased differentiation of monocyte-derived LCs. Only few studies have investigated on the role of LCs in psoriasis-like dermatitis model, but the results are variable and the exact role of LCs in psoriasis model remains to be elucidated. OBJECTIVE: To explore the functional role of resident (rLCs) and monocyte-derived LCs (mLCs) in imiquimod (IMQ)-induced psoriasis-like inflammation using human Langerin-diphtheria toxin subunit A (huLang-DTA) mice...
April 6, 2018: Journal of Dermatological Science
https://www.readbyqxmd.com/read/29572462/regulation-of-il-22bp-in-psoriasis
#7
Stefanos Voglis, Sonja Moos, Luise Kloos, Florian Wanke, Morad Zayoud, Penelope Pelczar, Anastasios D Giannou, Silvia Pezer, Michael Albers, Felix Luessi, Samuel Huber, Knut Schäkel, Florian C Kurschus
IL-22 is a potent pro-inflammatory cytokine upregulated in psoriasis and in other inflammatory diseases. The function of IL-22 is regulated by the soluble scavenging receptor, IL-22 binding protein (IL-22BP or IL-22RA2). However, the role and regulation of IL-22BP itself in the pathogenesis of inflammatory disease remain unclear. We used the TLR7 agonist Imiquimod (IMQ) to induce a psoriasis-like skin disease in mice and found a strong downregulation of IL-22BP in the affected skin as well as in the lymph nodes of animals treated with IMQ...
March 23, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29535261/p38%C3%AE-signaling-in-langerhans-cells-promotes-the-development-of-il-17-producing-t-cells-and-psoriasiform-skin-inflammation
#8
Tingting Zheng, Weiheng Zhao, Hongjin Li, Shuxiu Xiao, Ran Hu, Miaomiao Han, Heng Liu, Yeqiang Liu, Kinya Otsu, Xinguang Liu, Gonghua Huang
Dendritic cells (DCs) contribute to psoriasis pathogenesis. In a mouse model of imiquimod-induced psoriasiform skin inflammation, we found that p38α activity in Langerhans cells (LCs), a skin-resident subset of DCs, promoted the generation of T cells that produce IL-17, a proinflammatory cytokine that is implicated in autoimmune disease. Deletion of p38α in LCs, but not in other skin or circulating DC subsets or T cells, decreased T cell-mediated psoriasiform skin inflammation in mice. The activity of p38α in LCs specifically promoted IL-17 production from γδ and CD4+ T cells by increasing the abundance of IL-23 and IL-6, two cytokines that stimulate IL-17 secretion...
March 13, 2018: Science Signaling
https://www.readbyqxmd.com/read/29507554/the-role-of-regulatory-t-cells-and-genes-involved-in-their-differentiation-in-pathogenesis-of-selected-inflammatory-and-neoplastic-skin-diseases-part-ii-the-treg-role-in-skin-diseases-pathogenesis
#9
REVIEW
Bogusław Nedoszytko, Magdalena Lange, Małgorzata Sokołowska-Wojdyło, Joanna Renke, Piotr Trzonkowski, Michał Sobjanek, Aneta Szczerkowska-Dobosz, Marek Niedoszytko, Aleksandra Górska, Jan Romantowski, Justyna Czarny, Jarosław Skokowski, Leszek Kalinowski, Roman Nowicki
Regulatory FOXP3+ T cells (Tregs) constitute 5% to 10% of T cells in the normal human skin. They play an important role in the induction and maintenance of immunological tolerance. The suppressive effects of these cells are exerted by various mechanisms including the direct cytotoxic effect, anti-inflammatory cytokines, metabolic disruption, and modulation of the dendritic cells function. The deficiency of Treg cells number or function are one of the basic elements of the pathogenesis of many skin diseases, such as psoriasis, atopic dermatitis, bacterial and viral infections...
October 2017: Postȩpy Dermatologii i Alergologii
https://www.readbyqxmd.com/read/29454234/diarylheptanoid-from-rhizomes-of-curcuma-kwangsiensis-dck-inhibited-imiquimod-induced-dendritic-cells-activation-and-th1-th17-differentiation
#10
Qing Liu, Wei Yin, Ling Han, Jiaoyan Lv, Bingji Li, Yuli Lin, Qingsheng Mi, Rui He, Chuanjian Lu
BACKGROUND AND OBJECT: Dendritic cells (DCs) are critical for initiating the activation and differentiation of T cells in inflammatory diseases including psoriasis. Curcuma kwangsiensis S.G. Lee & C.F. Liang is a herb for treating psoriasis and we previously found Diarylheptanoid from rhizomes of Curcuma kwangsiensis (DCK) inhibited keratinocytes proliferation. However, it is unknown whether DCK influences DC functions. Thus we aimed to explore whether DCK affect the major immunological functions of DCs...
March 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29427464/the-expression-and-function-of-galectins-in-skin-physiology-and-pathology
#11
Nan-Lin Wu, Fu-Tong Liu
The galectin family comprises β-galactoside-binding proteins widely expressed in many organisms. There are at least 16 family members, which can be classified into three groups based on their carbohydrate-recognition domains. Pleiotropic functions of different galectins in physiological and pathological processes through extracellular or intracellular actions have been revealed. In the skin, galectins are expressed in a variety of cells, including keratinocytes, melanocytes, fibroblasts, dendritic cells, lymphocytes, macrophages and endothelial cells...
March 2018: Experimental Dermatology
https://www.readbyqxmd.com/read/29392742/the-vitamin-d3-analogue-calcipotriol-suppresses-cpg-activated-tlr9-myd88-signalling-in-murine-plasmacytoid-dendritic-cells
#12
T Suzuki, J Sakabe, K Kamiya, A Funakoshi, Y Tokura
BACKGROUND: Plasmacytoid dendritic cells (pDCs) are involved in the pathogenesis of psoriasis by secreting interferon-α. Vitamin D3 analogues are widely used to treat psoriasis, and the representative analogue calcipotriol (CAL) uniquely downregulates the cytokine production and chemotactic activity of pDCs. However, the molecular mechanism of action of CAL is not well understood. AIM: To investigate effects of CAL on the Toll-like receptor 9-myeloid differentiation primary response gene 88 (TLR9-MyD88) signalling pathway, which induces cytokine production, in murine pDCs...
February 1, 2018: Clinical and Experimental Dermatology
https://www.readbyqxmd.com/read/29316717/scanning-the-immunopathogenesis-of-psoriasis
#13
REVIEW
Andrea Chiricozzi, Paolo Romanelli, Elisabetta Volpe, Giovanna Borsellino, Marco Romanelli
Psoriasis is a chronic inflammatory skin disease, the immunologic model of which has been profoundly revised following recent advances in the understanding of its pathophysiology. In the current model, a crosstalk between keratinocytes, neutrophils, mast cells, T cells, and dendritic cells is thought to create inflammatory and pro-proliferative circuits mediated by chemokines and cytokines. Various triggers, including recently identified autoantigens, Toll-like receptor agonists, chemerin, and thymic stromal lymphopoietin may activate the pathogenic cascade resulting in enhanced production of pro-inflammatory and proliferation-inducing mediators such as interleukin (IL)-17, tumor necrosis factor (TNF)-α, IL-23, IL-22, interferon (IFN)-α, and IFN-γ by immune cells...
January 8, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29295985/tnf-blockade-induces-a-dysregulated-type-i-interferon-response-without-autoimmunity-in-paradoxical-psoriasis
#14
Curdin Conrad, Jeremy Di Domizio, Alessio Mylonas, Cyrine Belkhodja, Olivier Demaria, Alexander A Navarini, Anne-Karine Lapointe, Lars E French, Maxime Vernez, Michel Gilliet
Although anti-tumor necrosis factor (TNF) agents are highly effective in the treatment of psoriasis, 2-5% of treated patients develop psoriasis-like skin lesions called paradoxical psoriasis. The pathogenesis of this side effect and its distinction from classical psoriasis remain unknown. Here we show that skin lesions from patients with paradoxical psoriasis are characterized by a selective overexpression of type I interferons, dermal accumulation of plasmacytoid dendritic cells (pDC), and reduced T-cell numbers, when compared to classical psoriasis...
January 2, 2018: Nature Communications
https://www.readbyqxmd.com/read/29295520/the-origin-of-skin-dendritic-cell-network-and-its-role-in-psoriasis
#15
REVIEW
Tae-Gyun Kim, Sung Hee Kim, Min-Geol Lee
Dendritic cells (DCs) are heterogeneous groups of innate immune cells, which orchestrate immune responses by presenting antigens to cognate T cells and stimulating other types of immune cells. Although the term 'DCs' generally represent highly mixed subsets with functional heterogeneity, the classical definition of DCs usually denotes conventional DCs (cDCs). Skin contains a unique DC network mainly composed of embryo precursor-derived epidermal Langerhans cells (LCs) and bone marrow-derived dermal cDCs, which can be further classified into type 1 (cDC1) and type 2 (cDC2) subsets...
December 23, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29228712/the-cargo-protein-map17-pdzk1ip1-regulates-the-immune-microenvironment
#16
José M García-Heredia, Amancio Carnero
Inflammation is a complex defensive response activated after various harmful stimuli allowing the clearance of damaged cells and initiating healing and regenerative processes. Chronic, or pathological, inflammation is also one of the causes of neoplastic transformation and cancer development. MAP17 is a cargo protein that transports membrane proteins from the endoplasmic reticulum. Therefore, its overexpression may be linked to an excess of membrane proteins that may be recognized as an unwanted signal, triggering local inflammation...
November 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/29226422/pathogenesis-of-psoriasis-and-development-of-treatment
#17
REVIEW
Eisaku Ogawa, Yuki Sato, Akane Minagawa, Ryuhei Okuyama
The pathogenesis of psoriasis can be explained by dysregulation of immunological cell function as well as keratinocyte proliferation/differentiation. Recently, the immunological pathomechanism has been clarified substantially. Whereas T-helper (Th)1 overactivation was thought to induce occurrence of psoriasis, it has been demonstrated that Th17 cells play a key role. Th17 development is maintained by interleukin (IL)-23 mainly produced by dendritic cells. Th17 cells produce various cytokines, including IL-17A, IL-17F and IL-22...
March 2018: Journal of Dermatology
https://www.readbyqxmd.com/read/29226159/immunohistopathological-findings-of-severe-cutaneous-adverse-drug-reactions
#18
REVIEW
Mari Orime
Diagnosis of severe cutaneous adverse drug reactions should involve immunohistopathological examination, which gives insight into the pathomechanisms of these disorders. The characteristic histological findings of erythema multiforme (EM), Stevens-Johnson syndrome (SJS), and toxic epidermal necrolysis (TEN) provide conclusive evidence demonstrating that SJS/TEN can be distinguished from EM. Established SJS/TEN shows full-thickness, extensive keratinocyte necrosis that develops into subepidermal bullae. Drug-induced hypersensitivity syndrome (DIHS) and exanthema in drug reaction with eosinophilia and systemic symptoms (DRESS) each display a variety of histopathological findings, which may partly correlate with the clinical manifestations...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/29203862/diversification-of-human-plasmacytoid-predendritic-cells-in-response-to-a-single-stimulus
#19
Solana G Alculumbre, Violaine Saint-André, Jeremy Di Domizio, Pablo Vargas, Philemon Sirven, Pierre Bost, Mathieu Maurin, Paolo Maiuri, Maxime Wery, Mabel San Roman, Léa Savey, Maxime Touzot, Benjamin Terrier, David Saadoun, Curdin Conrad, Michel Gilliet, Antonin Morillon, Vassili Soumelis
Innate immune cells adjust to microbial and inflammatory stimuli through a process termed environmental plasticity, which links a given individual stimulus to a unique activated state. Here, we report that activation of human plasmacytoid predendritic cells (pDCs) with a single microbial or cytokine stimulus triggers cell diversification into three stable subpopulations (P1-P3). P1-pDCs (PD-L1+ CD80- ) displayed a plasmacytoid morphology and specialization for type I interferon production. P3-pDCs (PD-L1- CD80+ ) adopted a dendritic morphology and adaptive immune functions...
January 2018: Nature Immunology
https://www.readbyqxmd.com/read/29194565/impaired-langerhans-cell-migration-in-psoriasis-is-due-to-an-altered-keratinocyte-phenotype-induced-by-interleukin-17
#20
L H Eaton, K T Mellody, S M Pilkington, R J Dearman, I Kimber, C E M Griffiths
BACKGROUND: Psoriasis is a common skin condition driven by increased expression of interleukin (IL)-17. Langerhans cells (LCs) are epidermal dendritic cells that regulate cutaneous immune responses. Within the uninvolved skin of patients with psoriasis, LCs display impaired migration from the epidermis. OBJECTIVES: To investigate the role of keratinocytes (KCs) in the regulation of LC function and the response of KCs to IL-17. METHODS: KCs were cultured from the uninvolved skin of patients with psoriasis and healthy individuals with or without IL-17 treatment and the conditioned medium examined for its ability to alter LC function in an ex vivo human skin explant model...
December 1, 2017: British Journal of Dermatology
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