Please use this identifier to cite or link to this item: https://repositorio.unifesp.br/handle/11600/43826
Title: CARDIOVASCULAR EFFECTS OF A SPECIFIC NONPEPTIDE ANTAGONIST OF SUBSTANCE-P (NK-1) RECEPTOR IN DOCA-SALT HYPERTENSION
Authors: Kohlmann Junior, Osvaldo [UNIFESP]
Ginoza, Milton [UNIFESP]
Cesaretti, Mario Luis Ribeiro [UNIFESP]
Zanella, Maria Teresa [UNIFESP]
Ribeiro, Artur Beltrame [UNIFESP]|Tavares, Agostinho [UNIFESP]
Ramos, Oswaldo Luiz [UNIFESP]
Leeman, S. E.
Gavras, Irene
Gavras, Haralambos [UNIFESP]
BOSTON UNIV
Universidade Federal de São Paulo (UNIFESP)
Keywords: SUBSTANCE P
NEUROPEPTIDES
TACHYKININS HYPERTENSION
SODIUM-DEPENDENT
Issue Date: 1-Dec-1995
Publisher: Amer Heart Assoc
Citation: Hypertension. Dallas: Amer Heart Assoc, v. 26, n. 6, p. 1186-1189, 1995.
Abstract: The neurotransmitter substance P acts also as a potent vasodilator. Its participation in the pathogenesis of deoxycorticosterone acetate (DOCA)-salt hypertension was evaluated by an acute infusion of a newly synthesized, potent, specific nonpeptide antagonist of substance P at the NK-1 receptor, the agent CP 96 345. In conscious unrestrained rats, CP 96 345 induced significant and sustained increases in mean arterial pressure of DOCA-salt rats but only small, transient, and nonsignificant rises in blood pressure of sham-treated control rats. The rise in blood pressure was not accompanied by changes in heart rate. Maximal blood pressure increase in DOCA-salt rats was 31.7+/-14.8 mm Hg. In a second series of experiments, the hemodynamic effects of this antagonist were evaluated under anesthesia in both DOCA-salt and sham-treated control rats by the thermodilution method. During CP 96 345 infusion, sustained increases in cardiac index and stroke volume and decreases in total peripheral resistance were observed in both DOCA-salt and control rats. In DOCA-salt rats, cardiac index rose by 79.4%, while total peripheral resistance fell by 27.9% of the baseline values. In control rats, the changes were smaller (+27.2% and -22.5%, respectively). Stroke volume changed in parallel to cardiac output in both groups. The data suggest that acute blockade of NK-1 receptors increases blood pressure in DOCA-salt rats mainly by an increase in cardiac output. We conclude that endogenous substance P tends to counteract the DOCA-salt-induced elevation of blood pressure by modulating both cardiac output and peripheral resistance.
URI: http://repositorio.unifesp.br/11600/43826
ISSN: 0194-911X
Other Identifiers: https://doi.org/10.1161/01.HYP.26.6.1186
Appears in Collections:Artigo

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