In a study of beta-adrenergic receptor sensitivity, the authors
determined the response of cyclic AMP synthesis to in vitro addition of
norepinephrine (NE) and isoproterenol (IP) in leukocytes of patients with
affective illness and schizophrenia and of normal controls. IP- stimulated
increase in 3H-cyclic AMP synthesis in depressed patients was significantly
lower than in normal subjects and schizophrenic patients. These results
suggest that beta-adrenergic receptor sensitivity is reduced in depressive
illness.Abstract Teaser