DMI, Wy-45,030, Wy-45,881 and ciramadol inhibit locus coeruleus neuronal activity.

J T Haskins, J A Moyer, E A Muth, E B Sigg

European journal of pharmacology 1985 Sep 24

filter terms:

Wy-45,030 and Wy-45,881 block the uptake of norepinephrine and serotonin in rat brain synaptosomal preparations and share several in vivo and in vitro effects with known tricyclic antidepressants. To further characterize their activity, these compounds were compared to desipramine and ciramadol in electrophysiological studies of their acute effects on noradrenergic neuronal activity. All four compounds inhibited locus coeruleus neuronal activity with a rank order of potency of desipramine greater than Wy-45,881 greater than Wy-45,030 greater than ciramadol. Administration of the alpha-adrenergic blocking drug, piperoxane, increased locus coeruleus firing rate after desipramine, Wy-45,030 and Wy-45-881. Pretreatment with naloxone prevented the reduction in locus coeruleus impulse flow observed after ciramadol administration but had no effect on the inhibition produced by Wy-45,030. Wy-45,030 and Wy-45,881, like classical antidepressants, appear to inhibit locus coeruleus neuronal firing by potentiating neuroinhibitory transmission of locus coeruleus neurons by blocking the uptake of norepinephrine into presynaptic terminals.

Citation

J T Haskins, J A Moyer, E A Muth, E B Sigg. DMI, Wy-45,030, Wy-45,881 and ciramadol inhibit locus coeruleus neuronal activity. European journal of pharmacology. 1985 Sep 24;115(2-3):139-46