Cyclic adenosine monophosphate phosphodiesterase activity in peripheral blood mononuclear leucocytes from patients with atopic dermatitis: correlation with respiratory atopy

Publisher Website
Google Scholar
Abstract
We determined the cyclic adenosine monophosphate phosphodiesterase (cAMP-PDE) activity in peripheral blood mononuclear leucocytes from 100 patients with atopic dermatitis (AD) aged 13–57 years (mean ± SD, 29.8 ± 17.7 years). The correlation between cAMP-PDE activity and clinical parameters such as the severity of eczema and a personal or family predisposition to atopic respiratory diseases (ARD) (asthma or allergic rhinitis) was examined. Although the enzymic activity varied from normal to very high in the AD patients, cAMP-PDE activity was significantly (P < 0.005) elevated in AD patients (42.1 ± 22.0 units) as compared with the normal controls (12.4 ± 5.6) and clinical control subjects (13.4 ± 9.5). In contrast, we found no correlation between cAMP-PDE activity and the severity of eczema when AD patients were classified into four categories (remission, mild, moderate and severe) according to the extent of their skin involvement. Furthermore, we found that systemic corticosteroid therapy in severe AD patients did not alter the cAMP-PDE activity. cAMP-PDE activity was significantly (P < 0.01) higher in those AD patients who had a personal history of ARD (47.2 ± 11.2) than in AD patients with a family history of ARD (37.2 ± 17.4) and those without a personal or family history (‘pure’ AD) (34.4 ± 19.8). Nevertheless, the cAMP-PDE activity was significantly higher even in ‘pure’ AD patients than in the controls. These results suggest that an elevation of cAMP-PDE activity is closely related to a predisposition to respiratory atopy, and does not follow inflammation in AD patients.