Cited by 139Regulation of Appetite and ObesityNeuroscience of respiration and sleepAdipokines, Inflammation, and Metabolic Diseases

Leptin Signaling in the Nucleus Tractus Solitarii Increases Sympathetic Nerve Activity to the Kidney

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Mark, Allyn L., Agassandian, Khristofor, Morgan, Donald A., Liu, Xuebo, Cassell, Martin D., Rahmouni, Kamal·2009·Hypertension

Abstract

The hypothalamic arcuate nucleus was initially regarded as the principal site of leptin action, but there is increasing evidence for functional leptin receptors in extrahypothalamic sites, including the nucleus tractus solitarii (NTS). We demonstrated previously that arcuate injection of leptin increases sympathetic nerve activity (SNA) to brown adipose tissue and kidney. In this study, we tested the hypothesis that leptin signaling in the NTS affects sympathetic neural outflow. Using a stereotaxic device in anesthetized rats, we microinjected leptin (0.25 to 1.00 μg) or saline into the NTS while recording SNA to kidney and brown adipose tissue. Microinjection of leptin into the commissural and medial subnuclei of the caudal NTS at the level of the area postrema in Sprague-Dawley rats produced a dose-related increase in renal SNA (+112±15% with leptin 1 μg; n=7; P <0.001) but did not increase SNA to brown adipose tissue (−15±12%; P value not significant). This effect depended on intact functional leptin receptors, because it was not observed in Zucker obese rats that have a missense mutation in the leptin receptor. Rostral NTS injection of leptin failed to increase SNA, indicating that leptin signaling in the NTS is probably confined to the caudal NTS at the level of the area postrema. In summary, this study demonstrates that leptin signaling in the caudal NTS increases SNA to the kidney but not to the brown adipose tissue. The study strengthens the concept of a distributed brain network of leptin action and demonstrates that these distributed brain sites can mediate contrasting sympathetic responses to leptin.

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Crossref · 10.1161/hypertensionaha.108.124255

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  • Acute leptin injections into the brainstem nucleus tractus solitarius doubled renal sympathetic nerve activity and significantly increased blood pressure, suggesting that brainstem leptin receptors also contribute to the effect of leptin on sympathetic nerve activity.

    “Acute leptin injections into the brainstem NTS doubled RSNA and significantly increased BP, suggesting that brainstem LepRs also contribute to the effect of leptin on SNA138.”
  • The leptin receptor is expressed in multiple regions of the forebrain and hindbrain, including the hypothalamus, brainstem vasomotor centres, and intermediolateral nucleus of the spinal cord.

    “The LepR is expressed in multiple regions of the forebrain and hindbrain, including the hypothalamus, brainstem vasomotor centres and intermediolateral nucleus (IML) of the spinal cord119,135,138 (FIG. 5a).”

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Authors
Mark, A. L., Agassandian, K., Morgan, D. A., Liu, X., Cassell, M. D., & Rahmouni, K.
Affiliations
University of Iowa (US)
Venue
Hypertension
Published
2009-02
Volume
53
Issue
2
Pages
375-380
ISSN
  • 0194-911X (ISSN-L)
  • 1524-4563
OpenAlex
W2152899311
Cited by
139
References
24
Citations by year
2026: 2 · 2025: 3 · 2024: 6 · 2023: 8 · 2022: 2 · 2021: 3 · 2020: 8 · 2019: 8 · 2018: 4 · 2017: 9 · 2016: 8 · 2015: 8 · 2014: 16 · 2013: 20 · 2012: 14
FWCI
2.95
Type
journal article
Language
en
Open access
Locations
  • Hypertension (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • American Heart Association
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (HL-084207, P01HL084207)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Neuroscience of respiration and sleep
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
leptin, nucleus tractus solitarius, sympathetic activity, renal sympathetic nerve activity, brown adipose tissue, leptin receptor, area postrema, distributed brain networks, leptin signaling, Zucker fatty rats, leptin receptor mutation
MeSH terms
Animals, Adipose Tissue, Brown, Disease Models, Animal, Dose-Response Relationship, Drug, Kidney, Microinjections, Obesity, Rats, Zucker, Sympathetic Nervous System, Signal Transduction, Rats, Sprague-Dawley, Solitary Nucleus, Mutation, Missense, Leptin, Rats, Receptors, Leptin

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