Abstract:
:[D-Met2,Pro5]enkephalinamide (DMPEA) strongly activated cardioinhibitory vagal efferents and elicited bradycardia when perfused through the cerebroventricular system of anaesthetized dogs. These effects were concentration-dependent but plateaued at an intraventricular concentration of 200 micrograms/ml. At this maximally effective concentration, the vagal discharge rate was fourfold higher and the heart rate was lowered by 28% compared to the controls. These effects were reversed by naloxone (40 micrograms/ml). There was no significant change in blood pressure. Vagal discharge rate and heart rate correlated closely and inversely with each other with r values ranging between -0.75 and -0.95. Opiate receptors in brain structures bordering the cerebroventricular system are the most likely mediators of the effects of DMPEA. The opiate receptor/endorphin system may therefore play a role in the physiological control of cardiac vagal tone and thus of heart rate.
journal_name
Eur J Pharmacoljournal_title
European journal of pharmacologyauthors
Inoue K,Nashan B,Arndt JOdoi
10.1016/0014-2999(85)90216-xsubject
Has Abstractpub_date
1985-04-02 00:00:00pages
233-9issue
2eissn
0014-2999issn
1879-0712pii
0014-2999(85)90216-Xjournal_volume
110pub_type
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