Central interaction between endothelin and brain natriuretic peptide on pressor and hormonal responses.
Interaction between intracerebroventricular (i.c.v.) administration of endothelin (ET) and brain natriuretic peptide (BNP) on pressor and hormonal responses was examined in unanesthetized, freely moving rats. I.c.v. administered ET (5, 20 or 40 pmol/2 microliters) dose-dependently increased arterial pressure. Plasma catecholamine levels were elevated by 40 pmol of ET, and plasma ACTH level was also elevated by centrally administered ET in a dose-dependent manner. I.c.v. administration of BNP (0.2, 1 nmol/3 microliters) dose-dependently attenuated central ET (40 pmol/2 microliter)-induced pressor response, plasma catecholamine and ACTH secretion. These results indicate that ET may be one of the neuropeptides which stimulate both sympathetic nervous system and hypothalamo-pituitary-adrenal axis, and that BNP and ET interact in the central nervous system (CNS) to regulate cardiovascular and hormonal functions. Furthermore, these results raise a possibility that BNP antagonizes the effect of not only angiotensin II but also other neuropeptides in the CNS.
Makino
S
S
Third Department of Internal Medicine, Okayama University Medical School, Japan.
Hashimoto
K
K
Hirasawa
R
R
Hattori
T
T
Kageyama
J
J
Ota
Z
Z
D000324:Adrenocorticotropic Hormone / Q000097:blood; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects*; D002552:Cerebral Ventricles / Q000187:drug effects / Q000502:physiology*; D004347:Drug Interactions; D016232:Endothelins / Q000494:pharmacology*; D006339:Heart Rate / Q000187:drug effects*; D007276:Injections, Intraventricular; D008297:Male; D020097:Natriuretic Peptide, Brain; D009419:Nerve Tissue Proteins / Q000494:pharmacology*; D009638:Norepinephrine / Q000097:blood; D051381:Rats; D011919:Rats, Inbred Strains; D012016:Reference Values
D016232:Endothelins; D009419:Nerve Tissue Proteins; D020097:Natriuretic Peptide, Brain; D000324:Adrenocorticotropic Hormone; D009638:Norepinephrine