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  • 1
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 548 (1988), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 548 (1988), S. 0 
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Munksgaard International Publishers
    Experimental dermatology 13 (2004), S. 0 
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract: Even though anthralin is a well-established topical therapeutic agent for psoriasis, little is known about its effects and biochemical mechanisms of signal transduction. In contrast to a previous report, we found that anthralin induced time- and concentration-dependent phosphorylation of epidermal growth factor receptor in primary human keratinocytes. Four lines of evidence show that this process is mediated by reactive oxygen species. First, we found that anthralin induces time-dependent generation of H2O2. Second, there is a correlation between a time-dependent increase in anthralin-induced epidermal growth factor receptor phosphorylation and H2O2 generation. Third, the structurally different antioxidants n-propyl gallate and N-acetylcysteine inhibited epidermal growth factor receptor phosphorylation induced by anthralin. Fourth, overexpression of catalase inhibited this process. The epidermal growth factor receptor-specific tyrosine kinase inhibitor PD153035 abrogated anthralin-induced epidermal growth factor receptor phosphorylation and activation of extracellular-regulated kinase 1/2. These findings establish the following sequence of events: (1) H2O2 generation, (2) epidermal growth factor receptor phosphorylation, and (3) extracellular-regulated kinase activation. Our data identify anthralin-induced reactive oxygen species and, more specifically, H2O2 as an important upstream mediator required for ligand-independent epidermal growth factor receptor phosphorylation and downstream signaling.
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract:  The expression of amphiregulin (AR) in the basal epidermis of transgenic mice [keratin 14 promoter AR gene (K14-ARGE)] has been previously shown to induce an early-onset and severe skin pathology, with many similarities to psoriasis. In this study, it is demonstrated that involucrin enhancer/promoter-dependent expression of human AR (INV-AR) in the suprabasal epidermis of transgenic mice also produces a cutaneous psoriasis-like phenotype. INV-AR mice possess a limited lifespan and scaling, papillomatous, erythematous skin with partial alopecia. INV-AR mouse histopathology also revealed epidermal hyperkeratosis, parakeratosis, acanthosis, and an exaggerated dermal vasculature. A dermal and epidermal infiltrate was also evident and consisted of both neutrophils and CD3+ T lymphocytes. The histology of synovial joints in both the INV-AR mice and the K14-ARGE mice of our previous investigation was examined. The histologic examination revealed that 3-week-old INV-AR transgenic mice displayed normal knee joint histology, while 2- to 3-week-old K14-ARGE transgenic mice frequently displayed synovitis, as exemplified by the presence of a mixed leukocytic infiltration, increased vascularization, and enhanced deposition of fibrous matrix in the knee synovium. These results demonstrate that AR overexpression in both the basal and suprabasal epidermis of transgenic mice induces a phenotype that mimics cutaneous psoriasis, while basal AR expression is also associated with synovial inflammation, a precursor to the psoriasis-associated arthropathy, psoriatic arthritis. Collectively, the results implicate epidermal AR expression as a possible mediator of innate cutaneous immunity and epidermal proliferation and also as a potential trigger of both cutaneous psoriasis and psoriatic arthritis.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1600-0625
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract Human melanocytes established in MCDB-153 culture medium do not express α1-, β1-, β-2 adrenoceptors without extracellular stimulation. The addition of 50×10−9 M norepinephrine to the medium causes a time-dependent induction of α-1-adrenoceptors with 4.278 receptors/melanocyte after 24 h. Under the same experimental conditions, the dendricity of melanocytes as well as melanogenesis was unaffected over 60 h. Since keralinocytes hold the full capacity for catecholamine biosynthesis but melanocytes lack this system, the secretion of catecholamines from keratinocytes appears to be of critical importance to the α-1-adrenoceptor in melanocytes, underlining the symbiosis of both cells in the epidermal unit.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK; Malden, USA : Blackwell Science Inc
    Wound repair and regeneration 12 (2004), S. 0 
    ISSN: 1524-475X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Keratinocytes are frequently used to examine efficacy of wound healing products and dermatological agents in vitro. Cultured keratinocyte sheets are also used as autologous or allogenic grafts to promote wound closure. Because it is well known that the expression patterns of keratin genes change when cell cultures reach confluence, we investigated the expression pattern of wound healing-related genes, including growth factors and cytokines. Of additional particular interest is a novel wound healing related factor, secretory leukocyte protease inhibitor (SLPI), which appears to enhance tissue repair. We found that the expression pattern varied for specific genes expressed by keratinocytes as confluence was reached. Specifically, SLPI expression peaked in the early postconfluent state and vascular endothelial growth factor and amphiregulin in the late postconfluent state. Some gene products exhibit autocrine activity, whereas others exert paracrine regulation of growth. These findings indicate that it is critical to define the growth and differentiation state of human keratinocyte cultures to better determine responses and efficacy in vitro to various dermatological/wound care agents tested.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Background  2-Chlorodeoxyadenosine (2-CdA), a purine adenosine analog, is safe and effective chemotherapy for patients with hairy cell leukemia and low-grade lymphomas. Adverse effects include neutropenia, lymphocytopenia, and infectious complications. Our objective was to evaluate the efficacy of 2-CdA (2–6 seven-day cycles) in the treatment of late-stage, recalcitrant Sézary syndrome.Methods  Retrospective review of medical records of six patients with Sézary syndrome who had received 2-CdA cycles at Mayo Clinic, Rochester between March 1995 and March 2000. Variables assessed from the records included improvement in global appearance, extent of erythroderma, size of lymph nodes, pruritus, and leukocyte, lymphocyte, and absolute Sézary cell counts.Results  Two patients, both with stage III Sézary syndrome, whose previous treatment consisted of only two modalities, responded well to the treatment, with moderate to total clearing of erythroderma and pruritus associated with a significant decrease in Sézary cell counts. The other four patients had only a partial response (one patient) or no response (three patients) to 2-CdA. The mortality rate was 50%. All three patients died of Staphylococcus aureus sepsis. However, only one patient was receiving 2-CdA treatment when he died. The other two patients died 8 and 9 weeks after the last 2-CdA cycle. This high mortality rate is attributed to infectious complications after 2-CdA treatment in patients with recalcitrant disease.Conclusion  2-Chlorodeoxyadenosine shows efficacy in stage III Sézary syndrome, but it also carries a substantial risk of septic complications and mortality. It can be used if no other suitable alternatives are available. Caution should be exercised in all these patients regarding skin care and avoidance of infections or sepsis.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Periodontology 2000 1 (1988), S. 0 
    ISSN: 1600-0757
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: In this article we review some of our recent results on the growth of human skin cells in vitro with emphasis on the normal melanocyte. Growth in a defined culture medium of normal human melanocytes isolated from neonatal or adult skin has been achieved. Melanocytes can be routinely cultured in medium MCDB 153 (0.1 mM CaCl2) supplemented with bovine pituitary extract (BPE), insulin, ethanolamine, phosphoethanolamine, hydrocortisone, and 12-O-tetradecanoyl phorbol 13-acetate (TPA). The cells can be propagated for up to 35 cumulative population doublings in this medium. Further studies have shown that the undefined component of the medium, BPE, can be replaced with purified heparin-binding growth factor type-2 (also known as basic fibroblast growth factor), HBGF-2/bFGF, isolated from BPE. Neither epidermal growth factor nor trans-forming growth factor type-alpha could replace HBGP-2/bFGF for the growth of melanocytes. These results are in contrast to the growth factor requirements for normal human fibroblasts or keratinocytes whose proliferation in serum-free medium can be stimulated by either EGF or HBGF-2/bFGF. We have examined mRNA isolated from serum-free cultures of melanocytes, keratinocytes and fibroblasts for expression of the HBGF-2/bFGF gene. Fibroblasts, but not melanocytes or keratinocytes, express 4 distinct transcripts which hybridize to a specific HBGF-2/bFGF cDNA probe. Our results suggest that expression of the HBGF-2/bFGF gene is cell-type specific and that HBGF-2/bFGF produced by dermal cells could support the proliferation and/or normal homeostasis of melanocytes and keratinocytes during development and in adult skin.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] TGF-a was first discovered in the medium of retrovirally transformed fibroblasts8, but it has since been demonstrated that a large variety of neoplastic cells and tumours of non-haematopoietic origin display TGF-a expression5. In contrast, it has not been demonstrated that normal cells synthesize ...
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    [s.l.] : Nature Publishing Group
    Nature medicine 11 (2005), S. 17-18 
    ISSN: 1546-170X
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Medicine
    Notes: [Auszug] Psoriasis, an autoimmune disorder of the skin and joints, results from complex, aberrant relationships between the skin and immune system, as well as genetic makeup and factors in the environment. A central quandry of researchers studying this disease is whether it is triggered and propogated ...
    Type of Medium: Electronic Resource
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