Role of angiotensin II in chronic blood pressure control of heterozygous Ren-2 transgenic rats: Peripheral vasoconstriction versus central sympathoexcitation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985823%3A_____%2F19%3A00507819" target="_blank" >RIV/67985823:_____/19:00507819 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00023001:_____/19:00078046

Výsledek na webu

<a href="https://doi.org/10.1016/j.biopha.2019.108996" target="_blank" >https://doi.org/10.1016/j.biopha.2019.108996</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.biopha.2019.108996" target="_blank" >10.1016/j.biopha.2019.108996</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Role of angiotensin II in chronic blood pressure control of heterozygous Ren-2 transgenic rats: Peripheral vasoconstriction versus central sympathoexcitation

Popis výsledku v původním jazyce

Our previous studies demonstrated that chronic systemic blockade of renin-angiotensin system (RAS) lowered blood pressure (BP) of Ren-2 transgenic rats (TGR) by the attenuation of both angiotensin II-dependent and sympathetic vasoconstriction. Since systemic RAS blockade also inhibits brain RAS, we were interested which effects on these two types of vasoconstriction will have the central RAS blockade in hypertensive TGR rats. Adult male heterozygous TGR rats and their Hannover Sprague Dawley (HanSD) controls were subjected to chronic systemic or intracerebroventricular administration of either angiotensin type 1 receptor blocker losartan or direct renin inhibitor aliskiren for 4 weeks. Additional groups of TGR and HanSD rats were used for the evaluation of acute peripheral and brain effects of angiotensin II. Both chronic systemic and intracerebroventricular administrations of losartan or aliskiren normalized BP of TGR animals. BP effect of brain RAS blockade was based solely on the reduced sympathetic vasoconstriction, while systemic RAS blockade attenuated both angiotensin II-dependent and sympathetic vasoconstriction. Surprisingly, neither peripheral nor central pressor effects of acute angiotensin II administration were enhanced in TGR compared to HanSD rats. In conclusion, sympathoinhibition represents the main mechanism of BP reduction in heterozygous TGR rats subjected to chronic brain or systemic RAS blockade, while peripheral attenuation of angiotensin II-dependent vasoconstriction during systemic RAS blockade is less important. Our data suggest that the participation of angiotensin II in BP control of adult heterozygous TGR rats is shifted from peripheral vasoconstriction to central sympathoexcitation. Similar mechanisms cannot be excluded in human essential hypertension.

Název v anglickém jazyce

Role of angiotensin II in chronic blood pressure control of heterozygous Ren-2 transgenic rats: Peripheral vasoconstriction versus central sympathoexcitation

Popis výsledku anglicky

Our previous studies demonstrated that chronic systemic blockade of renin-angiotensin system (RAS) lowered blood pressure (BP) of Ren-2 transgenic rats (TGR) by the attenuation of both angiotensin II-dependent and sympathetic vasoconstriction. Since systemic RAS blockade also inhibits brain RAS, we were interested which effects on these two types of vasoconstriction will have the central RAS blockade in hypertensive TGR rats. Adult male heterozygous TGR rats and their Hannover Sprague Dawley (HanSD) controls were subjected to chronic systemic or intracerebroventricular administration of either angiotensin type 1 receptor blocker losartan or direct renin inhibitor aliskiren for 4 weeks. Additional groups of TGR and HanSD rats were used for the evaluation of acute peripheral and brain effects of angiotensin II. Both chronic systemic and intracerebroventricular administrations of losartan or aliskiren normalized BP of TGR animals. BP effect of brain RAS blockade was based solely on the reduced sympathetic vasoconstriction, while systemic RAS blockade attenuated both angiotensin II-dependent and sympathetic vasoconstriction. Surprisingly, neither peripheral nor central pressor effects of acute angiotensin II administration were enhanced in TGR compared to HanSD rats. In conclusion, sympathoinhibition represents the main mechanism of BP reduction in heterozygous TGR rats subjected to chronic brain or systemic RAS blockade, while peripheral attenuation of angiotensin II-dependent vasoconstriction during systemic RAS blockade is less important. Our data suggest that the participation of angiotensin II in BP control of adult heterozygous TGR rats is shifted from peripheral vasoconstriction to central sympathoexcitation. Similar mechanisms cannot be excluded in human essential hypertension.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

30105 - Physiology (including cytology)

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2019

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Biomedicine & Pharmacotherapy

ISSN

0753-3322

e-ISSN

—

Svazek periodika

116

Číslo periodika v rámci svazku

Aug

Stát vydavatele periodika

FR - Francouzská republika

Počet stran výsledku

8

Strana od-do

108996

Kód UT WoS článku

000471592900064

EID výsledku v databázi Scopus

2-s2.0-85066041636