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  • 1
    Electronic Resource
    Electronic Resource
    Topical application of 13-cis-retinoic acid in the treatment of chronic plaque psoriasis (1992)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental dermatology 17 (1992), S. 0 
    Details
    ISSN: 1365-2230
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Topical retinoids are of potential value in the treatment of psoriasis. The aim of the present study was to find out whether topical application of 13-cis-retinoic acid (13-cis-RA) has an antipsoriatic effect. Nine patients participated in the investigation. In each patient, two comparable psoriatic lesions (5×5 cm or more) were selected for treatment with either 13-cis-RA in a 0.1% cream base or with the vehicle only (placebo), using a double-blind approach. The investigation was a left-right within-subject comparison. The lesions were recorded for clinical scores 4 weeks before and after the investigation. Punch biopsies were taken from eight patients before and after treatment and examined using immunohistochemical methods to assess epidermal proliferation and keratinization, and to assess inflammation. Thirteen-cis-RA treatment resulted in a mild decrease of scaling and induration. Erythema however increased. No statistically significant difference in biological effects was achieved between 13-cis-RA and placebo treated lesions and no changes in expression of the immunohistochemical markers were seen.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2230.1992.tb02523.x
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  • 2
    Electronic Resource
    Electronic Resource
    Response of the clinically uninvolved skin of psoriatic patients to repeated tape stripping during cyclosporin A treatment (1994)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 130 (1994), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Summary It is well established that cyclosporin A (CyA), a widely used immunosuppressant in human organ transplantation, is an effective drug in the treatment of psoriasis. Although it has been postulated that the effect of CyA in psoriasis is mediated through antilymphocyte activity, there is also evidence suggesting that CyA exerts a direct cytostatic effect on epidermal keratinocytes, but results of studies relating to the latter have been contradictory.Using immunohistochemical methods we investigated the influence of systemic CyA on proliferation and differentiation in the tape-stripped uninvolved skin of psoriatic patients, a model which provides the opportunity of studying epidermal regeneration in the absence of a significant accumulation of T lymphocytes. We addressed the question of whether CyA (3–5 mg/kg/day) modulates epidermal proliferation and differentiation following standardized injury in uninvolved skin of psoriatic patients. Ten patients with severe psoriasis participated in this study. The dosages of CyA were sufficient to induce a marked and statistically significant improvement (PASI, week 0, 20.5·4.4; PASI, week 16, 4.3 ± 0.6). Before CyA treatment, and during week 16 of treatment, Sellotape stripping was carried out on a 2-cm2 area of the uninvolved skin of psoriatic patients. After 48 h punch biopsies were taken. Immunohistochemical assessment of recruitment of cycling cells (Ki-67), filaggrin, involucrin, T lymphocytes and tenascin, was carried out. We did not find any significant alteration during the treatment period in the tape-stripped uninvolved skin of psoriatic patients. We conclude that epidermal hyperproliferation and abnormal keratinization are not modulated directly by CyA at therapeutic doses in vivo. Furthermore, our study provides indirect evidence that the antipsoriatic effect of CyA is mediated by the immune system.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1994.tb02897.x
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Topical treatment of psoriatic plaques with 1,25-dihydroxyvitamin D3: a cell biological study (1993)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 128 (1993), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Calcitriol, 1α,25 dihydroxycholecalciferol (α.25 (OH)2 D2) is a natural active vitamin D3 metabolite, which has been shown to have antipsoriatic efficacy. In vitro studies have demonstrated that calcitriol influences various aspects of inflammation, epidermal proliferation and keratinization. The aim of the present study was to determine to what extent caicitriol (3 μ/g in white petrolatum) affects these parameters in vivo.Using an immunohistochemical assessment of recruitment of cycling epidermal cells, filaggrin and involucrin expression. T-cell accumulation, polymorphonuclear neutrophil (PMN) accumulation, amount of endothelium and ICAM-1 expression, we demonstrated that: (1) modulation of all these parameters occurred during calcitriol treatment; (ii) there was early reduction of epidermal proliferation and PMN accumulation: (iii) the order of changes was comparable with the response to treatment with calcipotriol.In conclusion, at the cell biological level, calcitriol (3 μ/g in white petrolatum) has a substantial effect on various elements of the psoriatic lesion.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-2133.1993.tb00263.x
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Extremely low levels of epidermal skin-derived antileucoproteinase/elafin in a patient with impetigo herpetiformis (1997)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 137 (1997), S. 0 
    Details
    ISSN: 1365-2133
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Impetigo herpetiformis (IH) is a rare pustular dermatosis with unknown aetiology, typically occurring during pregnancy. Based upon a similar clinical and histological presentation, i.e. spongiform accumulation of polymorphonuclear leucocytes in the stratum corneum, several authors consider IH as a variant of generalized pustular psoriasis (GPP), while others state that IH is a separate entity. Skin-derived antileucoproteinase (SKALP) is a strong and specific inhibitor of human leucocyte elastase (HLE) and proteinase 3, two neutral proteinases that have been implicated in leucocyte migration and tissue destruction. Previously, we reported decreased SKALP activity in pustular forms of psoriasis compared with plaque psoriasis. In this study we present a case study of a patient with IH, where SKALP activity was measured using biochemical and immunochemical techniques. Epidermal scales and sera were collected during the course of the disease. Comparison was made with three patients with GPP and six patients with plaque psoriasis. Initially, anti-HLE activity in epidermal scales of the patient with IH was comparable with values in patients with GPP, i.e. decreased compared with plaque psoriasis. During the course of the disease, anti-elastase activity dropped to undetectable levels, concomitant with the appearance of free elastase activity. This finding suggests a total saturation of epidermal anti-HLE activity. Low levels of SKALP, presumably complexed with HLE, could be measured immunochemically in scale extracts. Serum levels of total SKALP correlated with the disease activity. We suggest that a reduced amount of epidermal SKALP contributes to an imbalance between elastase and its inhibitor, resulting in the formation of epidermal pustules. This mechanism of pustule formation could apply both to GPP and IH, suggesting a final common pathway in the pathogenic mechanisms of IH and GPP.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-2133.1997.17811868.x
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    Paper (German National Licenses)
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