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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Experimental dermatology 3 (1994), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract MHC class I and II-defined, partially inbred miniature swine have recently become available as a large animal model in transplantation immunology. To investigate cutaneous immunocompetence in this model, cutaneous antigen presenting cell (ARC) function was assessed. For morphologic analysis, punch biopsies were examined by electron microscopy. By this technique, epidermal Langerhans cells bearing typical Birbeck granules could be detected. For functional studies, epidermal cell (EC) suspensions were prepared from split thickness skin specimens. Using FACS analysis, freshly prepared epidermal cell suspensions contained 1.8-4.7% MHC class II-positive cells. These EC potently stimulated allogeneic nylon wool-enriched peripheral blood T cells in the primary mixed EC-lymphocyte reaction. For in vivo assessment of cutaneous APC function. EC suspensions enriched for or depleted of class II-positive EC were generated by panning of class II-positive EC using mouse anti-MHC class II antibodies and anti-mouse IgG-coatcd petri dishes. EC were then coupled to the hapten trinitrophenol (TNP) and injected s.c. into autologous or MHC-mismatched pigs twice at a one week interval. One week later, pigs were challenged by s.c.-injection of 0.5-1 × 107 TNP-coupled or uncoupled EC. Autologous unseparated EC as well as EC enriched for MHC class II-positive cells were able to sensitize naive animals against TNP, whereas neither TNP-coupled EC depleted of class II-positive APC, MHC-mismatched EC coupled to TNP, nor uncoupled EC induced immunity to TNP. Our data indicate that inbred miniature swine possess competent cutaneous APC which are able to induce cutaneous immunity in a manner similar to Langerhans cells in murine or human skin.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract:  Under physiological conditions, skin mast cells preferentially localize around nerves, blood vessels and hair follicles. This observation, which dates back to Paul Ehrlich, intuitively suggests that these enigmatic, multifacetted protagonists of natural immunity are functionally relevant to many more aspects of tissue physiology than just to the generation of inflammatory and vasodilatory responses to IgE-dependent environmental antigens. And yet, for decades, mainstream-mast cell research has been dominated by a focus on the – undisputedly prominent and important – mast cell functions in type I immune responses and in the pathogenesis and management of allergic diseases. Certainly, it is hard to believe that the very large and rather selectively distributed number of mast cells in normal, uninflamed, non-infected, non-traumatized mammalian skin or mucosal tissue is simply hanging around there lazily day and night, just to wait for the odd allergen or parasite-associated antigen to come by so the mast cell can finally swing into action. Indeed, the past decade has witnessed a renaissance of mast cell research ‘beyond allergy’, along with a more systematic exploration of the surprisingly wide range of physiological functions that mast cells may be involved in. The current debate sketches many of the exciting new horizons that have recently come into our vision during this intriguing, ongoing search.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Copenhagen : Munksgaard International Publishers
    Experimental dermatology 10 (2001), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Many approaches have been attempted to harness the host immune system to act against malignant tumors. These have included animal and clinical trials with agents to non-specifically boost immunity, factors to augment specific immunity, transfer of lymphokine-activated killer cells and transfer of expanded populations of tumor-infiltrating lymphocytes. Therapeutic vaccination strategies have been employed using tumor extracts, purified tumor antigens, recombinant peptide tumor antigens and specific DNA sequences coding for a tumor antigen (genetic vaccination) both through direct administration to the host and by administration of antigen presenting cells exposed to these materials ex vivo. Recently, the use of RNA has been proposed for use in tumor vaccination protocols. The use of RNA has several potential advantages. Since total cellular RNA or mRNA can be utilized, it is not necessary to know the molecular nature of the putative tumor antigen(s). RNA can be effectively amplified; thus, unlike tumor-extract vaccines, only a small amount of tumor is needed to prepare the material for vaccination. Also, unlike DNA-based vaccines, there is little danger of incorporation of RNA sequences into the host genome. The possible utility of RNA-based vaccines for tumor immunotherapy should be further explored to determine whether such approaches are clinically useful.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc
    Experimental dermatology 13 (2004), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Significant evidence suggests that the nervous and immune systems have regulatory interactions within the skin. Langerhans cells (LCs) are dendritic antigen-presenting cells that reside within the epidermis. By laser confocal scanning microscopy, LCs in human skin have been found to be frequently in anatomic association with epidermal nerves. Additionally, a minority of LCs have been found by immunohistochemistry to have the neuropeptide calcitonin gene-related peptide (CGRP) on or near their cell surfaces. Functional studies have demonstrated that CGRP, pituitary adenylate cyclase-activating polypeptide, and vasoactive intestinal peptide inhibit antigen presentation by LCs, at least in some assays. Epinephrine and norepinephrine also have been shown to inhibit LC antigen presentation in vitro. Some of these agents appear to exert their effects through regulation of the expression of cytokines and costimulatory molecules. Furthermore, some of these agents inhibit the acquisition of contact hypersensitivity after intradermal administration. As a whole, these findings suggest a regulatory locus of interaction between the immune system and the nervous system within the skin.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Experimental dermatology 7 (1998), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: The immune system and nervous system are intimately related. In addition to neuroendocrine mechanisms, neuropeptides have a variety of effects on immune cells and are responsible at least in part for neurogenic inflammation. The presence of neuropeptides in the skin has been well documented. The influence of neuropeptides on Langerhans cells is the focus of this paper. The physical presence and effects of calcitonin gene-related peptide on Langerhans cells is emphasized. Discussion also includes the putative inflammatory and immunologic roles of vasoactive intestinal peptide, substance P, neurotensin, neuropeptide Y, and somatostatin in the skin.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Publishing Ltd/Inc
    Experimental dermatology 13 (2004), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Neurotrophins are responsible for the survival and outgrowth of nerves within the peripheral and central nervous systems. These factors include brain-derived neurotrophic factor (BDNF), CNTF, NT 3, and NT4/5. We have previously shown that LCs lie in close proximity to nerves and that several neuropeptides regulate LC function, implying that nerves send regulatory signals to LCs. To evaluate the possibility that LC signal nerves by release of neurotrophins, we examined LC expression of neurotrophins by RT-PCR. To eliminate the possibility of contaminating keratinocytes in highly enriched LC preparations, we utilized the LC-like cell lines XS52 (BALB/c derived) and XS106 (A/J derived) for initial experiments. The RNA obtained was digested with DNase to ensure complete absence of genomic DNA. Several independent RT-PCRs revealed expression of bands of the expected size for CTNF and NT4/5, but not for BDNF and NT3 in XS106 and XS52 cells. In contrast, the transformed keratinocyte cell line PAM212 expressed BDNF, as well as CTNF and NT4/5. Preliminary experiments with purified LC confirm the expression of CTNF and NT4/5 and also show the expression of BDNF. However, we cannot be sure that BDNF expression is not due to keratinocyte contamination. We conclude that LCs may regulate nerve cells by the release of neurotrophic factors.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Double immunofluorescence staining was done on normal adult human skin using antibodies to CGRP and CDla to identify CGRP-containing axons and LC. A network of highly dendritic LC was observed17 and the distribution of CGRP+ nerve fibres was similar to that previously described14'18. Most axons had ...
    Type of Medium: Electronic Resource
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