Cited by 130Blood Pressure and Hypertension StudiesHeart Rate Variability and Autonomic ControlRenin-Angiotensin System Studies

Systemic and Renal-Specific Sympathoinhibition in Obesity Hypertension

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Lohmeier, Thomas E., Iliescu, Radu, Liu, Boshen, Henegar, Jeffrey R., Maric-Bilkan, Christine, Irwin, Eric D.·2012·Hypertension

Abstract

Chronic pressure-mediated baroreflex activation suppresses renal sympathetic nerve activity. Recent observations indicate that chronic electric activation of the carotid baroreflex produces sustained reductions in global sympathetic activity and arterial pressure. Thus, we investigated the effects of global and renal specific suppression of sympathetic activity in dogs with sympathetically mediated, obesity-induced hypertension by comparing the cardiovascular, renal, and neurohormonal responses to chronic baroreflex activation and bilateral surgical renal denervation. After control measurements, the diet was supplemented with beef fat, whereas sodium intake was held constant. After 4 weeks on the high-fat diet, when body weight had increased ≈50%, fat intake was reduced to a level that maintained this body weight. This weight increase was associated with an increase in mean arterial pressure from 100±2 to 117±3 mm Hg and heart rate from 86±3 to 130±4 bpm. The hypertension was associated with a marked increase in cumulative sodium balance despite an approximately 35% increase in glomerular filtration rate. The importance of increased tubular reabsorption to sodium retention was further reflected by ≈35% decrease in fractional sodium excretion. Subsequently, both chronic baroreflex activation (7 days) and renal denervation decreased plasma renin activity and abolished the hypertension. However, baroreflex activation also suppressed systemic sympathetic activity and tachycardia and reduced glomerular hyperfiltration while increasing fractional sodium excretion. In contrast, glomerular filtration rate increased further after renal denervation. Thus, by improving autonomic control of cardiac function and diminishing glomerular hyperfiltration, suppression of global sympathetic activity by baroreflex activation may have beneficial effects in obesity beyond simply attenuating hypertension.

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Crossref · 10.1161/hypertensionaha.111.185074

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  • Increased renal sympathetic nerve activity in individuals with obesity contributes to increases in renin secretion, sodium reabsorption and blood pressure.

    “Increased RSNA in individuals with obesity contributes to increases in renin secretion, sodium reabsorption and BP159–161.”
  • The lack of effect of surgical renal denervation on plasma noradrenaline or heart rate suggests that sensory afferent signals from the kidneys to the brain may not make an important contribution to increases in sympathetic activity or cardiac autonomic dysfunction of obesity.

    “In obese dogs, surgical RDN reduced renal tissue noradrenaline concentration by over 96% and almost completely abolished hypertension but did not lower plasma noradrenaline levels or HR, suggesting that sensory afferent signals from the kidneys to the brain may not make an important contribution to increases in sympathetic activity or cardiac autonomic dysfunction of obesity160.”
  • Renal denervation nearly normalized blood pressure in dogs with established obesity-induced hypertension.

    “RDN also nearly normalized BP in dogs with established obesity-induced hypertension160,162 (FIG. 6).”
  • Renal denervation did not restore baroreflex sensitivity despite abolishing obesity-induced hypertension in obese dogs.

    “By contrast, RDN did not restore baroreflex sensitivity despite abolishing obesity-induced hypertension.”
  • In obese dogs, chronic baroreflex activation via electrical stimulation of the carotid sinuses reduced blood pressure, heart rate and heart rate variability and restored cardiac baroreflex sensitivity to control levels.

    “In obese dogs, chronic baroreflex activation via electrical stimulation of the carotid sinuses reduced BP, HR and HR variability and restored cardiac baroreflex sensitivity to control levels160.”

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Authors
Lohmeier, T. E., Iliescu, R., Liu, B., Henegar, J. R., Maric-Bilkan, C., & Irwin, E. D.
Affiliations
  • North Memorial Medical Center (US)
  • From the Department of Physiology and Biophysics (T.E.L., R.I., B.L., C.M.-B.) and the Department of Pathology (J.R.H.), University of Mississippi Medical Center, Jackson, MS; Cardiovascular Research Department (R.I.), “Gr. T. Popa” Center for Biomedical Research, and the University of Medicine and Pharmacy, “Gr. T. Popa” Iasi, Romania; North Memorial Medical Center (E.D.I.), Trauma Services, Robbinsdale, MN.
Venue
Hypertension
Published
2012-02
Volume
59
Issue
2
Pages
331-338
ISSN
  • 0194-911X (ISSN-L)
  • 1524-4563
OpenAlex
W2155568433
Cited by
130
References
50
Citations by year
2025: 2 · 2024: 4 · 2023: 7 · 2022: 7 · 2021: 9 · 2020: 3 · 2019: 8 · 2018: 6 · 2017: 13 · 2016: 14 · 2015: 12 · 2014: 19 · 2013: 16 · 2012: 9
FWCI
9.86
Type
journal article
Language
en
Open access
Locations
  • Hypertension (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Heart, Lung, and Blood Institute (HL‐51971, P01HL051971)
Topics
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Blood Pressure and Hypertension Studies
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Heart Rate Variability and Autonomic Control
  • Health Sciences › Medicine › Cardiology and Cardiovascular Medicine › Renin-Angiotensin System Studies
Keywords
obesity-related hypertension, renal denervation, renal sympathetic nerve activity, sympathetic nervous system, high-fat diet, sodium balance, fractional excretion of sodium, glomerular hyperfiltration, plasma renin activity, tachycardia
MeSH terms
Animals, Blood Pressure, Body Weight, Denervation, Disease Models, Animal, Dogs, Glomerular Filtration Rate, Hemodynamics, Hypertension, Kidney, Male, Obesity, Renin, Sympathetic Nervous System, Baroreflex, Diet, High-Fat

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