Rapid blood pressure increase after renal denervation in anaesthetized rats: interaction of oxidative stress and neuronal nitric oxide synthase

0517565 - FGÚ 2020 RIV PL eng J - Journal Article
Walkowska, A. - Vaněčková, Ivana - Sadowski, J. - Kompanowska - Jezierska, E.
Rapid blood pressure increase after renal denervation in anaesthetized rats: interaction of oxidative stress and neuronal nitric oxide synthase.
Journal of Physiology and Pharmacology. Roč. 70, č. 4 (2019), s. 613-618. ISSN 0867-5910
Grant - others:AV ČR(CZ) PAN-17-13
Program: Bilaterální spolupráce
Institutional support: RVO:67985823
Keywords : apocynin * N(omega)-propyl-L-arginine * neuronal nitric oxide synthase * blood pressure * reactive oxygen species * renal denervation * oxidative stress * high-salt, diet
OECD category: Cardiac and Cardiovascular systems
Impact factor: 2.644, year: 2019
Method of publishing: Open access
http://jpp.krakow.pl/journal/archive/08_19/pdf/10.26402/jpp.2019.4.12.pdf

We showed previously that in anaesthetized rats acute noninvasive renal denervation (DNX) induced an increase in arterial blood pressure (MABP), unlike the usual hypotensive effect. Here we aimed to establish the background of such unusual response, especially the role of oxidative stress as suggested by an earlier study. The contribution of oxidative stress was explored by studying the effects on DNX-induced MABP increase of pretreatment with 4-hydroxy-3-methoxyacetophenone (apocynin, APO), a powerful antioxidant and antihypertensive agent, and N(omega)-propyl-L-arginine (L-NPA), a blocker of neuronal nitric oxide synthase (nNOS). In anaesthetized Wistar rats maintained on standard (STD) or high-salt (HS) diet sequential right- and left-side DNX was performed. MABP responses were examined without pretreatment and after APO (20 mg/day on two preceding days) and L-NPA (1 mg/kg/h throughout experiment), given alone or combined. In untreated rats, bilateral DNX increased MABP by 6% on STD and 15% on HS diet (P < 0.01 or less), the difference between MABP responses was highly significant (P = 0.002). In STD rats APO or APO + L-NPA treatment failed to alter post-DNX MABP increases whereas L-NPA alone reversed the response and a significant 7% decrease occurred. In HS rats APO and L-NPA given alone reversed the MABP response and significant decreases of 14% (P = 0.001) and 8% (P = 0.01), were seen. Surprisingly, with L-NPA + APO pretreatment only abolishment (not reversal) of post-DNX pressure increase occurred. The results suggest that both systemic, intrarenal and brain oxidative stress, and excessive nNOS activity, mostly in the brain, determine the unexpected post-DNX pressure increase.
Permanent Link: http://hdl.handle.net/11104/0302894