Cited by 358Regulation of Appetite and ObesityNeuroscience of respiration and sleepAdipose Tissue and Metabolism

Interactions between the melanocortin system and leptin in control of sympathetic nerve traffic

Haynes, William G., Morgan, Donald A., Djalali, Ali, Sivitz, William I., Mark, Allyn L.·1999·Hypertension

Abstract

Leptin plays an important role in regulation of body weight through regulation of food intake and sympathetically mediated thermogenesis. The hypothalamic melanocortin system, via activation of the melanocortin-4 receptor (MC4-R), decreases appetite and weight, but its effects on sympathetic nerve activity (SNA) are unknown. In addition, it is not known whether sympathoactivation to leptin is mediated by the melanocortin system. We tested the interactions between these systems in regulation of brown adipose tissue (BAT) and renal and lumbar SNA in anesthetized Sprague-Dawley rats. Intracerebroventricular administration of the MC4-R agonist MT-II (200 to 600 pmol) produced a dose-dependent sympathoexcitation affecting BAT and renal and lumbar beds. This response was completely blocked by the MC4-R antagonist SHU9119 (30 pmol ICV). Administration of leptin (1000 microg/kg IV) slowly increased BAT SNA (baseline, 41+/-6 spikes/s; 6 hours, 196+/-28 spikes/s; P=0.001) and renal SNA (baseline, 116+/-16 spikes/s; 6 hours, 169+/-26 spikes/s; P=0.014). Intracerebroventricular administration of SHU9119 did not inhibit leptin-induced BAT sympathoexcitation (baseline, 35+/-7 spikes/s; 6 hours, 158+/-34 spikes/s; P=0.71 versus leptin alone). However, renal sympathoexcitation to leptin was completely blocked by SHU9119 (baseline, 142+/-17 spikes/s; 6 hours, 146+/-25 spikes/s; P=0.007 versus leptin alone). This study demonstrates that the hypothalamic melanocortin system can act to increase sympathetic nerve traffic to thermogenic BAT and other tissues. Our data also suggest that leptin increases renal SNA through activation of hypothalamic melanocortin receptors. In contrast, sympathoactivation to thermogenic BAT by leptin appears to be independent of the melanocortin system.

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Crossref · 10.1161/01.hyp.33.1.542

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  • Intracerebroventricular injections of an MC4R agonist increased brown adipose tissue and lumbar sympathetic nervous system activity.

    “In addition, ICV injections of MC4R agonist increased brown adipose tissue (BAT) and lumbar SNS activity whereas MC4R blockade completely abolished these effects [39].”

    From Role of the brain melanocortins in blood pressure regulation (2017) · cites this paper as [39]

  • MC4R blockade completely abolished the effects of intracerebroventricular MC4R agonist on brown adipose tissue and lumbar sympathetic nervous system activity.

    “In addition, ICV injections of MC4R agonist increased brown adipose tissue (BAT) and lumbar SNS activity whereas MC4R blockade completely abolished these effects [39].”

    From Role of the brain melanocortins in blood pressure regulation (2017) · cites this paper as [39]

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Authors
Haynes, W. G., Morgan, D. A., Djalali, A., Sivitz, W. I., & Mark, A. L.
Affiliations
University of Iowa (US)
Venue
Hypertension
Published
1999-01
Volume
33
Issue
1
Pages
542-547
ISSN
  • 0194-911X (ISSN-L)
  • 1524-4563
OpenAlex
W2038872854
Cited by
358
References
34
Citations by year
2026: 1 · 2025: 3 · 2024: 4 · 2023: 3 · 2022: 3 · 2021: 5 · 2020: 7 · 2019: 3 · 2018: 12 · 2017: 13 · 2016: 13 · 2015: 10 · 2014: 22 · 2013: 17 · 2012: 5
FWCI
7.07
Type
journal article
Language
en
Open access
closed
Locations
  • Hypertension (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Department of Veterans Affairs
  • Pharmaceutical Research and Manufacturers of America Foundation
  • National Institutes of Health (5p50hl044546-05, 5r29hl043514-05)
  • National Heart, Lung, and Blood Institute (HL-43514, HL-14388, HL-44546, P01HL014388)
  • National Institute of Neurological Disorders and Stroke
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 › Physiology › Adipose Tissue and Metabolism
Keywords
melanocortin system, leptin, melanocortin-4 receptor, sympathetic activity, brown adipose tissue, thermogenesis, renal sympathetic nerve activity, lumbar sympathetic nerve activity, hypothalamus, melanotan II, SHU9119, appetite regulation, body weight regulation
MeSH terms
Animals, Adipose Tissue, Brown, Cerebral Ventricles, Infusions, Intravenous, Injections, Intraventricular, Kidney, Male, Melanocyte-Stimulating Hormones, Proteins, Recombinant Proteins, Sympathetic Nervous System, Rats, Sprague-Dawley, Receptors, Corticotropin, Leptin, Receptor, Melanocortin, Type 4, Rats

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