Cited by 72Regulation of Appetite and ObesityNeuropeptides and Animal PhysiologyHypothalamic control of reproductive hormones

Melanocortin Signalling and the Regulation of Blood Pressure in Human Obesity: Melanocortin signalling and blood pressure

Greenfield, J. R.·2011·Journal of Neuroendocrinology

Abstract

Obesity has reached epidemic proportions worldwide. Sympathetic nervous system activation has been shown to play a major role linking obesity to the development of associated metabolic complications, such as hypertension. Recent evidence has implicated central melanocortin signalling in the regulation of blood pressure in rodents and humans. The importance of sympathetic neural activity in mediating this association has been highlighted. Humans with loss-of-function mutations in the melanocortin 4 receptor (MC4R) are an ideal group of subjects in whom the importance of melanocortin signalling in linking obesity to hypertension can be studied. Consistent with rodent studies, it was recently demonstrated that humans with MC4R deficiency have lower blood pressure, less hypertension, lower 24-h urinary catecholamine excretion, lower resting heart rate and attenuated insulin-mediated sympathetic activation compared to equally-obese humans. In overweight and obese humans without MC4R mutations, the infusion of a highly-selective MC4R agonist led to dose-dependent increases in blood pressure and heart rate. All effects were independent of insulin. This evidence supports the notion that the melanocortin system regulates blood pressure and sympathetic neural function. The results obtained in rodent and human studies, in relation to blood pressure and sympathetic function, may limit the use of MC4R agonists for the treatment of obesity. Future studies will determine whether MC4R deficiency is associated with protection from development of the detrimental cardiovascular consequences that accompany obesity.

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Crossref · 10.1111/j.1365-2826.2010.02088.x

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  • Compared with control individuals with obesity and intact MC4R signalling, individuals with MC4R deficiency had a lower prevalence of hypertension and reduced noradrenaline excretion despite severe obesity, insulin resistance and dyslipidemia.

    “Compared with control individuals with obesity and intact MC4R signalling, individuals with MC4R deficiency had a lower prevalence of hypertension and reduced noradrenaline excretion despite severe obesity, insulin resistance and dyslipidemia199,200.”
  • Hypertension prevalence is lower in MC4R deficient humans compared to control subjects, despite severe obesity and associated metabolic disorders.

    “Hypertension prevalence is lower in MC4R deficient humans compared to control subjects, despite severe obesity and associated metabolic disorders125,126.”
  • Subjects with melanocortin-4 receptor deficiency exhibit reductions in blood pressure compared to obese subjects with normal melanocortin-4 receptor function despite severe obesity.

    “Despite having severe obesity, subjects with MC4R deficiency exhibit reductions in BP, heart rate, urinary catecholamine excretion and SNS responses to cold stimuli compared to obese subjects with normal MC4R function.”

    From Role of the brain melanocortins in blood pressure regulation (2017) · cites this paper as [54]

  • Subjects with melanocortin-4 receptor deficiency exhibit reductions in heart rate compared to obese subjects with normal melanocortin-4 receptor function despite severe obesity.

    “Despite having severe obesity, subjects with MC4R deficiency exhibit reductions in BP, heart rate, urinary catecholamine excretion and SNS responses to cold stimuli compared to obese subjects with normal MC4R function.”

    From Role of the brain melanocortins in blood pressure regulation (2017) · cites this paper as [54]

  • Subjects with melanocortin-4 receptor deficiency exhibit reductions in sympathetic nervous system responses to cold stimuli compared to obese subjects with normal melanocortin-4 receptor function despite severe obesity.

    “Despite having severe obesity, subjects with MC4R deficiency exhibit reductions in BP, heart rate, urinary catecholamine excretion and SNS responses to cold stimuli compared to obese subjects with normal MC4R function.”

    From Role of the brain melanocortins in blood pressure regulation (2017) · cites this paper as [54]

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Authors
Greenfield, J. R.
Affiliations
Garvan Institute of Medical Research (AU)
Corresponding author
Greenfield, J. R.
Venue
Journal of Neuroendocrinology
Publisher
Wiley
Published
2011-01-10
Volume
23
Issue
2
Pages
186-193
ISSN
0953-8194 (ISSN-L)
OpenAlex
W2040428630
Cited by
72
References
64
Citations by year
2026: 3 · 2025: 1 · 2024: 2 · 2023: 5 · 2022: 4 · 2021: 3 · 2020: 6 · 2019: 4 · 2018: 2 · 2017: 6 · 2016: 5 · 2015: 9 · 2014: 5 · 2013: 7 · 2012: 7
FWCI
0.55
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Diabetes Australia Research Trust
  • GlaxoSmithKline Australia
  • National Health and Medical Research Council
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
Keywords
melanocortin-4 receptor, obesity, hypertension, blood pressure regulation, sympathetic nervous system, MC4R agonist, catecholamine excretion, heart rate, cardiovascular risk
MeSH terms
Animals, Blood Pressure, Heart Rate, Humans, Hypertension, Mutation, Obesity, Sympathetic Nervous System, Signal Transduction, Receptor, Melanocortin, Type 4, Melanocortins

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