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Mononuclear leukocyte cyclic adenosine monophosphate responses in psoriasis are normal.

It has been proposed that immune dysfunction in psoriasis is a consequence of aberrant cyclic nucleotide metabolism. We have examined cyclic AMP responses to isoprenaline, histamine, and prostaglandin E2 in peripheral blood mononuclear leukocytes from patients with psoriasis, in the presence and absence of a potent cyclic AMP phosphodiesterase inhibitor. Stimulated and basal cyclic AMP levels in mononuclear leukocytes from psoriatics did not differ from those observed in mononuclear leukocytes from normal subjects, irrespective of the stimulant employed, either in the presence or in the absence of the phosphodiesterase inhibitor. These findings do not support the hypothesis that psoriasis is associated with either impaired beta-adrenergic reactivity or a more generalized abnormality of mononuclear leukocyte cyclic nucleotide metabolism.