1
|
Tomalin LE, Kolbinger F, Suprun M, Wharton KA, Hartmann N, Peters T, Glueck A, Milutinovic M, Krueger JG, Suárez-Fariñas M. Deep resolution of clinical, cellular and transcriptomic inflammatory markers of psoriasis over 52 weeks of interleukin-17A inhibition by secukinumab. Clin Exp Dermatol 2024; 49:801-809. [PMID: 38240024 DOI: 10.1093/ced/llae006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 12/11/2023] [Accepted: 12/27/2023] [Indexed: 07/20/2024]
Abstract
BACKGROUND Secukinumab, an anti-interleukin (IL)-17A monoclonal antibody, induces histological and molecular resolution of psoriatic plaques by 12 weeks. However, the long-term effects of secukinumab on the molecular resolution of psoriatic inflammation remain unknown. OBJECTIVES To investigate the molecular resolution of psoriasis following 52 weeks of secukinumab treatment. METHODS This was a two-part phase II randomized double-blinded placebo-controlled 52-week study of patients with moderate-to-severe psoriasis receiving secukinumab 300 mg (NCT01537432). Psoriatic lesional and nonlesional skin biopsies were obtained at baseline and at weeks 12 and 52, and the composition of the residual disease genomic profile (RDGP; i.e. 'molecular scar') of biopsies from secukinumab responders analysed. RESULTS After 52 weeks of treatment, 14 of 24 enrolled patients were considered to be clinical responders [≥ 75% improvement in Psoriasis Area and Severity Index (PASI 75)], 4 of 24 were considered to be nonresponders (< PASI 75) and 6 of 24 patients were lost to follow-up; both the histological and transcriptomic profiles of PASI 75 responders improved from week 12 to week 52. RDGP transcripts of histological responders only partially overlapped between weeks 12 and 52, despite a similar number of transcripts in each RDGP; specifically, four novel transcript subsets showed distinct expression dynamics between weeks 12 and 52 ('slow-resolving', 'recurring', 'persistent' and 'resolved'), with anti-inflammatory and immunomodulatory genes (e.g. SOCS1, CD207 and IL37) notably restored at week 52. Shorter disease duration prior to secukinumab treatment coincided with greater transcript improvements at weeks 12 and 52. CONCLUSIONS Secukinumab improves the histological and molecular phenotype of psoriatic lesional skin up to 52 weeks of treatment; these results suggest possible mechanisms that drive long-term control of psoriasis.
Collapse
Affiliation(s)
- Lewis E Tomalin
- Department of Population Health Science and Policy, Department of Genetics and Genomics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | | | - Maria Suprun
- Department of Population Health Science and Policy, Department of Genetics and Genomics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| | - Keith A Wharton
- Novartis Biomedical Research, Cambridge, MA, USA
- Ultivue, Inc., Cambridge, MA, USA
| | | | | | - Anton Glueck
- Novartis Biomedical Research, Basel, Switzerland
| | | | - James G Krueger
- Laboratory of Investigative Dermatology, Rockefeller University, New York, NY, USA
| | - Mayte Suárez-Fariñas
- Department of Population Health Science and Policy, Department of Genetics and Genomics, Icahn School of Medicine at Mount Sinai, New York, NY, USA
| |
Collapse
|
2
|
Zhang D, Qu Y, Sui C, Li M, Yuan Y, Wang N, Ma W. CD207 Expression Level is a New Prognostic Marker for Condyloma Acuminatum. Clin Cosmet Investig Dermatol 2023; 16:1607-1613. [PMID: 37383183 PMCID: PMC10295532 DOI: 10.2147/ccid.s412162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Accepted: 05/16/2023] [Indexed: 06/30/2023]
Abstract
Background Condyloma cuminata (CA) is a sexually transmitted disease caused by human papillomavirus (HPV) infection, which is prone to recurrence and difficult to cure in the short term. CD207 is a C-type lectin receptor that is specifically expressed on the surface of Langerhans cells (LCs) and is considered as an LC-specific immunohistochemical marker. The main purpose of this study is to explore the correlation between the expression of CD207 in CA skin lesions and the duration of CA disease course and frequency of recurrence, in order to provide new prognostic markers for CA to clinicians. Materials and Methods A total of 40 male patients with CA and their skin lesions were collected, as well as 40 healthy male penile tissue samples. The skin lesions of CA were clinically and histologically confirmed by acetic acid test. The expression of CD207 in epidermal tissues was detected using immunohistochemistry. The difference in the number of CD207 positive cells between CA skin lesions and healthy skin controls was compared, and the association between the number of CD207 positive cells in CA skin lesions and the duration of disease course and the frequency of recurrence was determined through Spearman correlation analysis. Conclusion In CA skin lesions, CD207 positive cells were found to have morphological abnormalities and the number of cells was significantly reduced compared to healthy skin, suggesting that there may be antigen presentation dysfunction in CA skin lesions, which may be the reason for the prolonged and unresolved condition of the disease. The fewer CD207 positive cells in CA skin lesions, the longer the disease course and the more frequent the recurrence, therefore, the expression level of CD207 can be used as a new prognostic marker for predicting the outcome of CA.
Collapse
Affiliation(s)
- Dong Zhang
- Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong, People’s Republic of China
| | - Yan Qu
- Department of Dermatology, Yantai Yuhuangding Hospital, Yantai, Shandong, People’s Republic of China
| | - Changlin Sui
- Department of Dermatology, Yantai Yuhuangding Hospital, Yantai, Shandong, People’s Republic of China
| | - Meiling Li
- Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong, People’s Republic of China
| | - Yanmei Yuan
- Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong, People’s Republic of China
| | - Ningning Wang
- Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong, People’s Republic of China
| | - Weiyuan Ma
- Department of Dermatology, Affiliated Hospital of Weifang Medical University, Weifang, Shandong, People’s Republic of China
| |
Collapse
|
3
|
Wu K, Li R, Zhang Y, Liu Y, Wang M, Huang J, Zhu C, Zhang J, Yuan X, Liu Q. The discovery of a new type of innervation in lymphoid organs. Physiol Rep 2023; 11:e15604. [PMID: 36823776 PMCID: PMC9950540 DOI: 10.14814/phy2.15604] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2022] [Revised: 01/26/2023] [Accepted: 01/26/2023] [Indexed: 02/25/2023] Open
Abstract
It is well known that the main forms of innervation are synapses and free nerve endings, while other forms of innervation have not been reported. Here, we explore a new way of innervating lymphoid organs. Male Sprague-Dawley rats were used for studying the innervation of sympathetic nerve fibers in lymph nodes by means of anterograde tracking, immunoelectron microscopy, three-dimension reconstruction analysis, and immunofluorescence labeling. The results showed that the Fluoro-Ruby labeled nerve endings targeted only a group of cells in the lymph nodes and entered the cells through the plasma membrane. The electron microscopy showed that the biotinylated glucan amine reaction elements were distributed in the cytoplasm, and most of the biotinylated glucan amine active elements were concentrated on the microtubule and microfilament walls. Birbeck particles with rod-shaped and/or tennis racket like structures can be seen in the labeled cells at high magnification, and Birbeck particles contain biotinylated glucan amine-reactive elements. The immunofluoresence results showed that the Fluoro-Ruby-labeled nerve innervating cells expressed CD207 and CD1a protein. This result confirmed that the labeled cells were Langerhans cells. Our findings suggested that Langerhans cells might serve as a "bridge cell" for neuroimmune cross-talking in lymph organs, which play an important role in transmitting signals of the nervous system to immune system. This study also opened up a new way for further study of immune regulation mechanism.
Collapse
Affiliation(s)
- Kaiyun Wu
- Department of AnatomyMedical College of Soochow UniversitySuzhouChina
| | - Ruixi Li
- Department of Anatomy, Histology and EmbryologyShanghai Medical College of Fudan UniversityShanghaiChina
| | - Yanlin Zhang
- Department of NeurologySecond Affiliated Hospital of Soochow UniversitySuzhouChina
| | - YanMei Liu
- Department of AnatomyMedical College of Soochow UniversitySuzhouChina
| | - MinChen Wang
- Department of AnatomyMedical College of Soochow UniversitySuzhouChina
| | - Jinyu Huang
- Department of AnatomyMedical College of Soochow UniversitySuzhouChina
| | - Changlai Zhu
- Jiangsu Key Laboratory of NeuroregenerationNantong UniversityNantongChina
| | - Jianping Zhang
- Department of Anatomy, Histology and EmbryologyShanghai Medical College of Fudan UniversityShanghaiChina
| | - Xiangshan Yuan
- Department of Anatomy, Histology and EmbryologyShanghai Medical College of Fudan UniversityShanghaiChina
| | - Qingqing Liu
- Department of AnatomyMedical College of Soochow UniversitySuzhouChina
| |
Collapse
|
4
|
Neagu M, Constantin C, Jugulete G, Cauni V, Dubrac S, Szöllősi AG, Zurac S. Langerhans Cells-Revising Their Role in Skin Pathologies. J Pers Med 2022; 12:2072. [PMID: 36556292 PMCID: PMC9782496 DOI: 10.3390/jpm12122072] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2022] [Revised: 12/09/2022] [Accepted: 12/14/2022] [Indexed: 12/23/2022] Open
Abstract
Langerhans cells (LCs) constitute a cellular immune network across the epidermis. Because they are located at the skin barrier, they are considered immune sentinels of the skin. These antigen-presenting cells are capable of migrating to skin draining lymph nodes to prime adaptive immune cells, namely T- and B-lymphocytes, which will ultimately lead to a broad range of immune responses. Moreover, LCs have been shown to possess important roles in the anti-cancer immune responses. Indeed, the literature nicely highlights the role of LCs in melanoma. In line with this, LCs have been found in melanoma tissues where they contribute to the local immune response. Moreover, the immunogenic properties of LCs render them attractive targets for designing vaccines to treat melanoma and autoimmune diseases. Overall, future studies will help to enlarge the portfolio of immune properties of LCs, and aid the prognosis and development of novel therapeutic approaches to treating skin pathologies, including cancers.
Collapse
Affiliation(s)
- Monica Neagu
- Immunology Department, “Victor Babes” National Institute of Pathology, 050096 Bucharest, Romania
- Department of Pathology, Colentina Clinical Hospital, 020125 Bucharest, Romania
- Faculty of Biology, University of Bucharest, 76201 Bucharest, Romania
| | - Carolina Constantin
- Immunology Department, “Victor Babes” National Institute of Pathology, 050096 Bucharest, Romania
- Department of Pathology, Colentina Clinical Hospital, 020125 Bucharest, Romania
| | - Gheorghita Jugulete
- Department of Infectious Diseases, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania
- Clinical Section IX—Pediatrics, “Prof. Dr. Matei Balş” National Institute for Infectious Diseases, 050474 Bucharest, Romania
| | - Victor Cauni
- Department of Urology, Colentina University Hospital, 050474 Bucharest, Romania
| | - Sandrine Dubrac
- Department of Dermatology, Venereology and Allergology, Medical University of Innsbruck, 6020 Innsbruck, Austria
| | - Attila Gábor Szöllősi
- Department of Immunology, Faculty of Medicine, University of Debrecen, 4032 Debrecen, Hungary
| | - Sabina Zurac
- Department of Pathology, Colentina Clinical Hospital, 020125 Bucharest, Romania
- Department of Pathology, “Carol Davila” University of Medicine and Pharmacy, 050474 Bucharest, Romania
| |
Collapse
|
5
|
Emmanuel T, Petersen A, Houborg HI, Rønsholdt AB, Lybaek D, Steiniche T, Bregnhøj A, Iversen L, Johansen C. Climatotherapy at the Dead Sea for psoriasis is a highly effective anti-inflammatory treatment in the short term; an immunohistochemical study. Exp Dermatol 2022; 31:1136-1144. [PMID: 35196397 PMCID: PMC9541097 DOI: 10.1111/exd.14549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 01/19/2022] [Accepted: 02/20/2022] [Indexed: 12/04/2022]
Abstract
Climatotherapy is a well‐described treatment of psoriasis. Dead Sea climatotherapy (DSC) in Israel consists of intensive sun and Dead Sea bathing and is very effective in improving clinical and patient‐reported outcomes. However, the effect of DSC has not been widely studied. We aimed to investigate the effect of DSC on psoriasis skin using quantitative immunohistochemistry techniques and analysis of blood samples. Skin punch biopsies from 18 psoriasis patients from a previous cohort study were used. Biopsies were obtained from non‐lesional skin and from a psoriasis target lesion at baseline. A biopsy was acquired from the target lesion after DSC. Among patients who achieved complete visual clearance, a biopsy was also obtained at relapse. Blood samples were obtained at the same time points. We performed haematoxylin and eosin staining and quantitative immunohistochemical analysis of CD3, CD4, CD8, CD11c, CD103, CD163, CD207, forkhead box P3, Ki67 and myeloperoxidase. We performed blood tests of cholesterol, c‐reactive protein, glucose, haemoglobin A1c and triglycerides. All skin biomarkers except for CD207 were decreased after DSC. At relapse, none of the biomarkers were significantly different from the baseline lesional measurements. Total CD207 staining correlated with psoriasis area and severity index at baseline while CD163 staining correlated with psoriasis area and severity index at EOT. No changes were observed in selected blood tests during the study. Consistent with clinical results, DSC is highly effective in the short term almost normalising all investigated biomarkers. However, at relapse, biomarkers were upregulated to the baseline level.
Collapse
Affiliation(s)
- Thomas Emmanuel
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Annita Petersen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | | | | | - Dorte Lybaek
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Torben Steiniche
- Department of Pathology, Aarhus University Hospital, Aarhus, Denmark
| | - Anne Bregnhøj
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Lars Iversen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| | - Claus Johansen
- Department of Dermatology, Aarhus University Hospital, Aarhus, Denmark
| |
Collapse
|
6
|
Differential Changes in Inflammatory Mononuclear Phagocyte and T-Cell Profiles within Psoriatic Skin during Treatment with Guselkumab vs. Secukinumab. J Invest Dermatol 2021; 141:1707-1718.e9. [PMID: 33524368 DOI: 10.1016/j.jid.2021.01.005] [Citation(s) in RCA: 60] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 01/09/2021] [Accepted: 01/15/2021] [Indexed: 12/13/2022]
Abstract
Cellular sources of IL-23 and IL-17A driving skin inflammation in psoriasis remain unclear. Using high-dimensional unsupervised flow cytometry analysis, mononuclear phagocytes and T cells were examined in the same lesions of patients before and during guselkumab (IL-23p19 blocker) or secukinumab (IL-17A blocker) treatment. Among CD11c+HLA-DR+ mononuclear phagocytes, CD64brightCD163-CD14brightCD1c-CD1a‒ inflammatory monocyte‒like cells were the predominant IL-23-producing cells and, together with CD64-CD163-CD14-IL-23p19-TNF-α+ inflammatory dendritic cell‒like cells, were increased in lesional compared with those in nonlesional skin taken from the same patient. Within T cells, CD8+CD49a+ and/or CD103+ tissue-resident memory T cells, CD4+CD25+FoxP3+ regulatory T cells, and CD4+CD49a-CD103- T cells were increased. Moreover, CD4+CD49a-CD103- T cells and the relatively rare CD8+ memory T cells equally contributed to IL-17A production. Both treatments decreased the frequencies of inflammatory monocyte‒like, inflammatory dendritic cell‒like, and CD4+CD49a-CD103- T cells. In contrast, guselkumab reduced memory T cells while maintaining regulatory T cells and vice versa for secukinumab. Neither drug modified the frequencies of IL-17A+IL‒17F+/- CD4+ or CD8+ T cells. This study reveals the identity of the major IL-23+ mononuclear phagocyte and IL-17+ T-cell subsets in psoriatic skin lesions and paves the way for a better understanding of the mode of action of drugs targeting the IL-23/IL-17A pathway in psoriasis.
Collapse
|
7
|
Silvagni E, Bortoluzzi A, Ciancio G, Govoni M. Biological and synthetic target DMARDs in psoriatic arthritis. Pharmacol Res 2019; 149:104473. [PMID: 31585178 DOI: 10.1016/j.phrs.2019.104473] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Revised: 08/28/2019] [Accepted: 09/30/2019] [Indexed: 12/29/2022]
Abstract
Psoriatic arthritis (PsA) is a chronic multi-faceted immune-mediated systemic disorder, characterized by articular, cutaneous, enthesis, nail and spine involvement. Articular manifestations of PsA are particularly common and highly disabling for patients, while the heterogeneous clinical subsets of the disease are challenging for clinicians. In recent years, research has made many advances in understanding the pathogenesis of the disease from genetic, epigenetic and molecular points of view. New drugs are now available for the treatment of this condition, and, in particular, TNF-alfa inhibitors, historically the first biologicals approved in PsA, are now juxtaposed by new biological disease modifying anti-rheumatic drugs (bDMARDs) with different modes of action. Targeting IL-12/IL-23 p40 common subunit with ustekinumab, IL-17A with secukinumab and ixekizumab, T cells co-stimulation with abatacept, is now possible, safe and effective. Moreover, targeted synthetic molecules with oral administration are available, with the possibility to interfere with phosphodiesterase-4 and JAK/STAT pathways. Indeed, new drugs are under development, with the possibility to target selectively IL-17 receptor, IL-23, and other key molecular targets in the pathogenesis of this condition. In this narrative review, we provide an up-to-date overview of the current application of biological and targeted synthetic DMARDs in the field of PsA, with particular regard to the clinical significance of this possibility to target a higher number of distinct immune-pathways.
Collapse
Affiliation(s)
- Ettore Silvagni
- Department of Medical Sciences, Section of Rheumatology, University of Ferrara and Azienda Ospedaliero-Universitaria Sant'Anna, Cona, Ferrara, Italy
| | - Alessandra Bortoluzzi
- Department of Medical Sciences, Section of Rheumatology, University of Ferrara and Azienda Ospedaliero-Universitaria Sant'Anna, Cona, Ferrara, Italy
| | - Giovanni Ciancio
- Department of Medical Sciences, Section of Rheumatology, University of Ferrara and Azienda Ospedaliero-Universitaria Sant'Anna, Cona, Ferrara, Italy.
| | - Marcello Govoni
- Department of Medical Sciences, Section of Rheumatology, University of Ferrara and Azienda Ospedaliero-Universitaria Sant'Anna, Cona, Ferrara, Italy
| |
Collapse
|
8
|
Florian P, Flechsenhar KR, Bartnik E, Ding‐Pfennigdorff D, Herrmann M, Bryce PJ, Nestle FO. Translational drug discovery and development with the use of tissue‐relevant biomarkers: Towards more physiological relevance and better prediction of clinical efficacy. Exp Dermatol 2019; 29:4-14. [DOI: 10.1111/exd.13942] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2018] [Revised: 02/28/2019] [Accepted: 03/26/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Peter Florian
- Department of Type 1/17 Immunology and Arthritis Sanofi Frankfurt Germany
| | | | - Eckart Bartnik
- Department of Type 1/17 Immunology and Arthritis Sanofi Frankfurt Germany
| | | | - Matthias Herrmann
- Department of Type 1/17 Immunology and Arthritis Sanofi Frankfurt Germany
| | - Paul J. Bryce
- Department of Type 2 Inflammation and Fibrosis Sanofi Cambridge Massachusetts
| | - Frank O. Nestle
- Global Head of Immunology Therapeutic Research Area Sanofi Cambridge Massachusetts
| |
Collapse
|
9
|
Kirby B. Langerhans cells in psoriasis: getting to the core of the disease. Br J Dermatol 2019; 178:1240. [PMID: 29897117 DOI: 10.1111/bjd.16596] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- B Kirby
- Department of Dermatology, St Vincent's University Hospital, Elm Park, Dublin 4
| |
Collapse
|
10
|
Abstract
Psoriasis is a common skin disease that presents with well-demarcated patches of inflammation. Recurrent disease in fixed areas of the skin indicates a localized disease memory that is preserved in resolved lesions. In line with such concept, the involvement of tissue-resident immune cells in psoriasis pathology is increasingly appreciated. Langerhans cells (LCs) are perfectly placed to steer resident T cells and local tissue responses in psoriasis. Here, we present an overview of the current knowledge of LCs in human psoriasis, including findings that highlight pro-inflammatory features of LCs in psoriasis lesions. We also review the literature on conflicting data regarding LC localization and functionality in psoriasis. Our review highlights that further studies are needed to elucidate the molecular mechanisms that drive LCs functionality in inflammatory diseases.
Collapse
Affiliation(s)
- Liv Eidsmo
- Department of Medicine Solna, Karolinska Institutet, Solna, Sweden.,Department of Dermatology, Karolinska University Hospital, Stockholm, Sweden
| | - Elisa Martini
- Department of Medicine Solna, Karolinska Institutet, Solna, Sweden.,Department of Dermatology, Karolinska University Hospital, Stockholm, Sweden
| |
Collapse
|
11
|
Deckers J, Hammad H, Hoste E. Langerhans Cells: Sensing the Environment in Health and Disease. Front Immunol 2018; 9:93. [PMID: 29449841 PMCID: PMC5799717 DOI: 10.3389/fimmu.2018.00093] [Citation(s) in RCA: 113] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2017] [Accepted: 01/12/2018] [Indexed: 12/17/2022] Open
Abstract
In the last few decades, our understanding of Langerhans cells (LCs) has drastically changed based on novel findings regarding the developmental origin and biological functions of these epidermis-specific resident immune cells. It has become clear that LCs not only exert pivotal roles in immune surveillance and homeostasis but also impact on pathology by either inducing tolerance or mediating inflammation. Their unique capabilities to self-renew within the epidermis, while also being able to migrate to lymph nodes in order to present antigen, place LCs in a key position to sample the local environment and decide on the appropriate cutaneous immune response. Exciting new data distinguishing LCs from Langerin+ dermal dendritic cells (DCs) on a functional and ontogenic level reveal crucial roles for LCs in trauma and various skin pathologies, which will be thoroughly discussed here. However, despite rapid progress in the field, the exact role of LCs during immune responses has not been completely elucidated. This review focuses on what mouse models that have been developed in order to enable the study of murine LCs and other Langerin-expressing DCs have taught us about LC development and function.
Collapse
Affiliation(s)
- Julie Deckers
- VIB Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine, Ghent University, Ghent, Belgium
| | - Hamida Hammad
- VIB Center for Inflammation Research, Ghent, Belgium.,Department of Internal Medicine, Ghent University, Ghent, Belgium
| | - Esther Hoste
- VIB Center for Inflammation Research, Ghent, Belgium.,Department of Biomedical Molecular Biology, Ghent University, Ghent, Belgium
| |
Collapse
|
12
|
Johansen C. Generation and Culturing of Primary Human Keratinocytes from Adult Skin. J Vis Exp 2017. [PMID: 29286419 DOI: 10.3791/56863] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
The main function of keratinocytes is to provide the structural integrity of the epidermis, thereby maintaining a mechanical barrier to the outside world. In addition, keratinocytes play an essential role in the initiation, maintenance, and regulation of epidermal immune responses by being part of the innate immune system responding to antigenic stimuli in a fast, nonspecific manner. Here, we describe a protocol for isolation of primary human keratinocytes from adult skin, and demonstrate that these cells respond to calcium-induced terminal differentiation, as measured by an increased expression of the differentiation marker involucrin. In addition, we show that the isolated keratinocytes are responsive to IL-1β-induced activation of intracellular signaling pathways as measured by the activation of the p38 MAPK pathway. Taken together, we describe a method for isolation and culturing of primary human keratinocytes from adult skin. Because the keratinocytes are the predominant cell type in the epidermis, this method is useful to study molecular mechanisms in cutaneous biology in vitro.
Collapse
|