Role of nifedipine-sensitive sympathetic vasoconstriction in maintenance of high blood pressure in spontaneously hypertensive rats: effect of Gi-protein inactivation by pertussis toxin

0343342 - FGÚ 2011 RIV GB eng J - Journal Article
Pintérová, Mária - Karen, Petr - Kuneš, Jaroslav - Zicha, Josef
Role of nifedipine-sensitive sympathetic vasoconstriction in maintenance of high blood pressure in spontaneously hypertensive rats: effect of Gi-protein inactivation by pertussis toxin.
Journal of Hypertension. Roč. 28, č. 5 (2010), s. 969-978. ISSN 0263-6352. E-ISSN 1473-5598
R&D Projects: GA MŠMT(CZ) 1M0510; GA ČR(CZ) GA305/08/0139; GA AV ČR(CZ) IAA500110902
Institutional research plan: CEZ:AV0Z50110509
Keywords : calcium channels * inhibitory G proteins * pertussis toxin
Subject RIV: FA - Cardiovascular Diseases incl. Cardiotharic Surgery
Impact factor: 3.980, year: 2010

The overexpression of pertussis toxin (PTX)-sensitive inhibitory G-proteins (Gi) participating in the development and maintenance of high BP in SHRs suggested us to study Gi-protein involvement in the pathway through which noradrenergic vasoconstriction and calcium influx can be coupled. PTX pretreatment of SHRs significantly decreased BP and reduced sympathetic vasoconstriction, which was partially substituted by enhanced angiotensin II-dependent vasoconstriction. PTX pretreatment of SHRs also decreased BP component sensitive to acute blockade of calcium entry by nifedipine. Thus the enhanced contribution of SNS to hypertension maintenance in SHRs is mediated by Gi-protein-coupled pathway controlling calcium influx through L type of voltage-dependent calcium channels
Permanent Link: http://hdl.handle.net/11104/0185845