however , grf stimulated gh release was reduced by high doses of catecholamines : dopamine ( 10 ( -6 ) m by 34 % ) , norepinephrine ( 10 ( -6 ) m by 74 % ) , epinephrine ( 10 ( -8 ) m by 47 % ; 10 ( -7 ) m by 41 % ; 10 ( -6 ) m by 89 % ) , and by the alpha 1 adrenergic agonist , phenylephrine ( 10 ( -7 ) m by 52 % ) , the alpha 2 agonist , clonidine ( 10 ( -8 ) m by 34 % ; 10 ( -7 ) m by 83 % ) and the beta agonist , isoproterenol ( 10 ( -7 ) m by 64 % ) .
C0007412
catecholamines
C0028351
norepinephrine