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Skin reactions to 40% nonanoic acid in propanol (NON) and to 4% hydrochloric acid were evaluated by image analysis of 20 MHz B scan recordings (Dermascan C, Cortex Technology). 18 women, aged 18 to 45, were patch tested with 24-h application time, and clinical and instrumental evaluations were
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The toxic, irritative, and sensitizing effects of topically applied sodium lauryl sulfate (SLS), dithranol triacetate (DTA), nonanoic acid in methyl- or propyl ester (NAM, NAP) in the buccal mucosa were investigated in a Sprague-Dawley rat model. Semi-quantitative evaluations of cellular infiltrates
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Exposure to irritants may cause chronic irritant contact dermatitis (ICD), characterized by irregular epidermal thickening and a predominantly dermal mononuclear cell infiltrate. The mechanisms involved, and why only certain individuals are affected, are not clearly understood. Different irritants
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OBJECTIVE
Vasodilation with increased cutaneous perfusion is an essential part of an irritant inflammatory response. The aim of the present study was to investigate the usefulness of the high-resolution laser Doppler perfusion imaging (HR-LDPI) technique for investigating irritant skin reactions.
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The responses to 12-HETE in normal human skin have been investigated by means of intradermal and topical administration in 15 subjects. Intradermal infusion of 12-HETE produced a neutrophil polymorphonuclear and mononuclear infiltrate in the dermis. Topical administration resulted in a dose-related
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Pathophysiological components of irritant contact dermatitis caused by 3 chemically-different irritants were investigated. 20 healthy volunteers were patch tested with sodium lauryl sulphate, nonanoic acid and hydrochloric acid on the flexor side of the upper arm. The skin response was evaluated
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In order to gain a greater insight into the complex mechanisms of action of different irritant chemicals on the skin, we have studied the behavior of epidermal CD1+ cells in experimentally induced irritant contact dermatitis. Healthy, human volunteers were patch tested for 48 h with the following
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In previous studies, we showed that a number of aspects of the histopathology of irritant contact dermatitis are profoundly influenced by the chemical nature of the irritant applied. We report here that this phenomenon also extends to the infiltration of leukocytes into the epidermis. Healthy
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Alterations in the proliferative capacity of human epidermis following topical exposure to structurally unrelated chemical irritants were investigated, with the aim of improving our understanding of the cellular changes that take place during the development of irritant contact dermatitis (ICD).
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4-Hydroxy-2-nonenal (HNE) is one of the most studied products of phospholipid peroxidation, owing to its reactivity and cytotoxicity. It can be formed by several radical-dependent oxidative routes involving the formation of hydroperoxides, alkoxyl radicals, epoxides, and fatty acyl cross-linking
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