Cited by 23Renin-Angiotensin System StudiesBlood Pressure and Hypertension StudiesEicosanoids and Hypertension Pharmacology

Renin–angiotensin and sympathetic nervous system contribution to high blood pressure in Schlager mice

Palma-Rigo, Kesia, Jackson, Kristy L., Davern, Pamela J., Nguyen-Huu, Thu-Phuc, Elghozi, Jean-Luc, Head, Geoffrey A.·2011·Journal of Hypertension

Abstract

OBJECTIVE: Schlager hypertensive (BPH/2J) mice have been suggested to have high blood pressure (BP) due to an overactive sympathetic nervous system (SNS), but the contribution of the renin-angiotensin system (RAS) is unclear. In the present study, we examined the cardiovascular effects of chronically blocking the RAS in BPH/2J mice. METHODS: Schlager normotensive (BPN/3J, n = 6) and BPH/2J mice (n = 8) received the angiotensin AT 1A-receptor antagonist losartan (150 mg/kg per day) in drinking water for 2 weeks. Pre-implanted telemetry devices were used to record mean arterial pressure (MAP), heart rate (HR) and locomotor activity. RESULTS: MAP was reduced by losartan treatment in BPN/3J (-23 mmHg, P < 0.01) and in BPH/2J mice (-25 mmHg, P < 0.001), whereas HR was increased. Losartan had little effect on initial pressor responses to feeding or to stress, but did attenuate the sustained pressor response to cage-switch stress. During the active period, the hypotension to sympathetic blockade with pentolinium was greater in BPH/2J than BPN/3J (suggesting neurogenic hypertension), but was not affected by losartan. During the inactive period, a greater depressor response to pentolinium was observed in losartan-treated animals. CONCLUSION: The hypotensive actions of losartan suggest that although the RAS provides an important contribution to BP, it contributes little, if at all, to the hypertension-induced or the greater stress-induced pressor responses in Schlager mice. The effects of pentolinium suggest that the SNS is mainly responsible for hypertension in BPH/2J mice. However, the RAS inhibits sympathetic vasomotor tone during inactivity and prolongs sympathetic activation during periods of adverse stress, indicating an important sympatho-modulatory role.

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Crossref · 10.1097/hjh.0b013e32834bbb6b

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  • BPH/2J mice are a genetic model of lifelong hypertension and show some cardinal features of essential hypertension, including neurohumoral dysfunction, sympathetic activation, cardiac hypertrophy, and kidney atrophy.

    “BPH/2J mice are a model of lifelong hypertension on a genetic basis and manifest some of the cardinal features of essential hypertension, i.e., neurohumoral dysfunction, sympathetic activation, cardiac hypertrophy, and kidney atrophy (58,59).”

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Authors
Palma-Rigo, K., Jackson, K. L., Davern, P. J., Nguyen-Huu, T.-P., Elghozi, J.-L., & Head, G. A.
Affiliations
  • Baker Heart and Diabetes Institute (AU)
  • Inserm (FR)
Corresponding author
Head, Geoffrey A.
Venue
Journal of Hypertension
Published
2011-11
Volume
29
Issue
11
Pages
2156-2166
ISSN
0263-6352 (ISSN-L)
OpenAlex
W2333243992
Cited by
23
References
47
Citations by year
2024: 1 · 2023: 2 · 2021: 3 · 2019: 2 · 2018: 2 · 2017: 3 · 2016: 1 · 2015: 2 · 2014: 2 · 2013: 2 · 2012: 3
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Hypertension (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Agence Nationale de la Recherche (ANR-08-BLAN-0175)
  • National Health and Medical Research Council
  • National Medical Research Council
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Eicosanoids and Hypertension Pharmacology
Keywords
renin-angiotensin system, sympathetic nervous system, hypertension, losartan, neurogenic hypertension, pentolinium, sympathetic vasomotor tone, mean arterial pressure, heart rate, locomotor activity
MeSH terms
Animals, Antihypertensive Agents, Behavior, Animal, Blood Pressure, Heart Rate, Humans, Hypertension, Male, Pressure, Renin-Angiotensin System, Sympathetic Nervous System, Telemetry, Losartan, Mice

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