Inhibition of vasodepressor neurons in the caudal ventrolateral medulla of the rabbit increases both arterial pressure and the release of neuropeptide Y-like immunoreactivity from the spinal cord.

Abstract:

:The role of bulbospinal neuropeptide Y (NPY)-containing neurons of the rostral ventrolateral medulla in the rabbit in mediating the increase in blood pressure that occurs during inhibition of cells in the caudal ventrolateral medulla was investigated in urethane-anaesthetized rabbits. In the present experiments bilateral injections of the GABA agonist, muscimol, into the caudal ventrolateral medulla elicited a slowly-developing rise in arterial pressure that was maximal 15 min after the injection. Accompanying this increase in arterial pressure was an increase in the release of NPY-like immunoreactivity (NPY-LI) into the spinal subarachnoid space. This pattern of response is similar to that seen after direct chemical stimulation of the NPY-containing cells of the rostral ventrolateral medulla. Taken together, these findings suggest that tonically active neurons in the caudal ventrolateral medulla exert their effects by inhibiting sympathoexcitatory NPY-containing neurons whose cell bodies are situated in the rostral ventrolateral medulla.

journal_name

Brain Res

journal_title

Brain research

authors

Pilowsky PM,Morris MJ,Minson JB,West MJ,Chalmers JP,Willoughby JO,Blessing WW

doi

10.1016/0006-8993(87)91261-3

subject

Has Abstract

pub_date

1987-09-15 00:00:00

pages

380-4

issue

2

eissn

0006-8993

issn

1872-6240

pii

0006-8993(87)91261-3

journal_volume

420

pub_type

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