Summary
Inhibitory activities against elastase, chymotrypsin and trypsin were studied in the fluid from experimentally developed suction blisters in the uninvolved skin of patients with psoriasis. These activities determined by spectrophotometry of specific synthetic low molecular weight substrates were compared with respective antiproteinase activities in sera of 32 patients with psoriatic lesions, ten patients in remission, and ten healthy volunteers. A marked reduction (29.2%) in the specific elastase inhibitory activity of blister fluid was found in patients with psoriasis when compared with normal subjects (p<0.05), since neither chymotrypsin nor trypsin inhibitory activities were altered. This reduction was despite about a 30% increase in the elastase inhibitory activity in the sera of these patients, which was related presumably to their increased activity of α1-proteinase inhibitor, the main serum antiserine proteinase inhibitor. A decreased blister fluid∶serum elastase inhibition ratio was shown in a large majority of patients with psoriasis, even in symptomless patients. The deficiency in specific elastase inhibitory activity of suction blister fluid was predominantly associated with early onset of psoriasis, guttate lesions and inactive lesions, skin involvement less than 20% of body surface, duration of relapse shorter than 2 months, and frequent relapses. These data indicate that the uninvolved skin of patients with psoriasis contains low concentrations of specific elastase tissue inhibitor, which deficiency might result in an excessive in vivo hydrolytic activity of neutrophil elastase released from migrating cells in the psoriatic skin.
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Glinski, W., Pierozynska-Dubowska, M., Glinska-Ferenz, M. et al. Decreased specific anti-elastase activity in the uninvolved skin of patients with psoriasis. Arch Dermatol Res 283, 224–229 (1991). https://doi.org/10.1007/BF01106106
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DOI: https://doi.org/10.1007/BF01106106