in contrast to epinephrine pretreatment , pretreatment of cells in suspension with 10 ( -7 ) m 12-o-tetradecanoylphorbol-13-acetate ( tpa ) for 15 min resulted in a nearly complete blunting in the ability of both norepinephrine and phenylephrine to stimulate inositol phosphate accumulation : after norepinephrine stimulation , 774 +/- 34 dpm in tpa-pretreated cells vs 2590 +/- 10 in control cells ;
C0014563
epinephrine
C0028351
norepinephrine