[D-Met2,Pro5]enkephalinamide activates cardioinhibitory efferents in anaesthetized dogs.

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 Pharmacol

authors

Inoue K,Nashan B,Arndt JO

doi

10.1016/0014-2999(85)90216-x

subject

Has Abstract

pub_date

1985-04-02 00:00:00

pages

233-9

issue

2

eissn

0014-2999

issn

1879-0712

pii

0014-2999(85)90216-X

journal_volume

110

pub_type

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