title: Effect of sympathomimetic amines on the histamine forming capacity of human leucocytes.
abstract: 1 The effects of alpha- and beta-adrenoceptor stimulants on the histamine-forming capacity (HFC) of human isolated leucocytes have been studied, in vitro.2 It was confirmed that antigen significantly stimulates the HFC of human leucocytes.3 beta-Adrenoceptor stimulants, such as isoprenaline and salbutamol (10(-6)-10(-3)M) significantly inhibited the HFC of human leucocytes in the presence and absence of antigen. At concentrations lower than 10(-6)M, this effect was not observed. In general the degree of inhibition of HFC by beta-adrenoceptor stimulants followed their potency as beta-adrenoceptor stimulants.4 alpha-Adrenoceptor stimulants significantly stimulated leucocyte HFC; noradrenaline within a limited concentration of 10(-6)M, while stimulation was seen consistently with phenylephrine at concentrations of 10(-7)-10(-4)M. Adrenaline, which stimulates both alpha- and beta-adrenoceptors, produced small inhibition, no effect, or a degree of stimulation.5 Phentolamine, an alpha-adrenoceptor blocking agent, produced an effect opposite to that of the alpha-adrenoceptor stimulants, i.e. a significant inhibition of the HFC of human isolated leucocytes.
mesh_terms: D000316:Adrenergic alpha-Agonists / Q000494:pharmacology*; D000318:Adrenergic beta-Agonists / Q000494:pharmacology*; D000420:Albuterol / Q000494:pharmacology; D000937:Antigen-Antibody Reactions / Q000187:drug effects; D000941:Antigens; D004837:Epinephrine / Q000494:pharmacology; D006632:Histamine / Q000096:biosynthesis* / Q000097:blood; D006801:Humans; D066298:In Vitro Techniques; D007545:Isoproterenol / Q000494:pharmacology; D007962:Leukocytes / Q000187:drug effects / Q000378:metabolism*; D009638:Norepinephrine / Q000494:pharmacology; D010656:Phenylephrine / Q000494:pharmacology; D011433:Propranolol / Q000494:pharmacology
chemical_list: D000316:Adrenergic alpha-Agonists; D000318:Adrenergic beta-Agonists; D000941:Antigens; D010656:Phenylephrine; D006632:Histamine; D011433:Propranolol; D007545:Isoproterenol; D000420:Albuterol; D009638:Norepinephrine; D004837:Epinephrine