Ruth J A, Doerr A L, Eiden L E
Eur J Pharmacol. 1984 Oct 1;105(1-2):189-91. doi: 10.1016/0014-2999(84)90667-8.
Leucine-enkephalin produces a dose related decrease in the contractile response of spirally cut strips of rat aorta to norepinephrine (NE). The maximal effect (55.0 +/- 1.0 percent reduction in developed tension) occurs at a leucine-enkephalin concentration of 10(-10) M. The attenuation of contractile response is reversed by naloxone.