Cited by 164Regulation of Appetite and ObesityPancreatic function and diabetesAdipokines, Inflammation, and Metabolic Diseases

Hypothalamic Leptin Signaling Regulates Hepatic Insulin Sensitivity via a Neurocircuit Involving the Vagus Nerve

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German, Jonathan, Kim, Francis, Schwartz, Gary J., Havel, Peter J., Rhodes, Christopher J., Schwartz, Michael W., Morton, Gregory J.·2009·Endocrinology

Abstract

Recent evidence suggests that hormones such as insulin and leptin act in the hypothalamus to regulate energy balance and glucose metabolism. Here we show that in leptin receptor-deficient Koletsky (fak/fak) rats, adenovirally induced expression of leptin receptors in the area of the hypothalamic arcuate nucleus improved peripheral insulin sensitivity via enhanced suppression of hepatic glucose production, with no change of insulin-stimulated glucose uptake or disposal. This effect was associated with increased insulin signal transduction via phosphatidylinositol-3-OH kinase (as measured by pY-insulin receptor substrate-1 and pS-PKB/Akt) in liver, but not skeletal muscle, and with reduced hepatic expression of the gluconeogenic genes, glucose-6-phosphatase and phosphoenolpyruvate kinase. Moreover, the beneficial effects of hypothalamic leptin signaling on hepatic insulin sensitivity were blocked by selective hepatic vagotomy. We conclude that hypothalamic leptin action increases peripheral insulin sensitivity primarily via effects on the liver and that the mechanism underlying this effect is dependent on the hepatic branch of the vagus nerve.

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Crossref · 10.1210/en.2009-0445

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  • This leptin action is distinct from its previously reported effect to increase insulin sensitivity in the liver and offers compelling evidence of a novel mechanism through which the brain normalizes diabetic hyperglycemia without the need for insulin.

    “This leptin action is distinct from its previously reported effect to increase insulin sensitivity in the liver (66, 146), and offers compelling evidence of a novel mechanism through which the brain normalizes diabetic hyperglycemia without the need for insulin (67).”
  • Restoring leptin receptor signaling to the ARC of leptin receptor-deficient Koletsky rats improves insulin sensitivity via enhanced insulin-induced suppression of glucose production, not glucose uptake.

    “restoring leptin receptor signaling to the ARC of leptin receptor-deficient Koletsky rats, improved insulin sensitivity was shown to involve enhanced insulin-induced suppression of glucose production, rather than changes of glucose uptake (66).”
  • Leptin action in the ARC increases peripheral insulin sensitivity primarily via effects on the liver, is PI3K-dependent, and involves inhibition of hepatic gluconeogenic gene expression.

    “Thus, leptin action in the ARC increases peripheral insulin sensitivity primarily via effects on the liver, and like insulin, this effect is PI3K-dependent and involves inhibition of hepatic gluconeogenic gene expression.”
  • Restoring hypothalamic leptin signaling to Koletsky rats improves hepatic insulin sensitivity, and this effect is blocked by selective hepatic vagotomy.

    “Moreover, the beneficial effects of restoring hypothalamic leptin signaling to Koletsky rats on hepatic insulin sensitivity were blocked by selective hepatic vagotomy (66).”
  • The antidiabetic effect of CNS leptin is distinct from leptin's previously reported effect to increase hepatic insulin sensitivity.

    “This leptin action is distinct from its previously reported effect to increase insulin sensitivity in the liver and offers compelling evidence that the brain has the capacity to normalize diabetic hyperglycemia in the presence of sufficient amounts of central nervous system leptin.”

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Authors
German, J., Kim, F., Schwartz, G. J., Havel, P. J., Rhodes, C. J., Schwartz, M. W., & Morton, G. J.
Affiliations
  • University of Washington (US)
  • Albert Einstein College of Medicine (US)
  • University of California, Davis (US)
  • University of Chicago (US)
Corresponding author
Morton, Gregory J.
Venue
Endocrinology
Published
2009-07-02
Volume
150
Issue
10
Pages
4502-4511
ISSN
  • 0013-7227 (ISSN-L)
  • 1945-7170
OpenAlex
W2067242542
Cited by
164
References
49
Citations by year
2026: 2 · 2025: 4 · 2024: 3 · 2023: 6 · 2022: 7 · 2021: 4 · 2020: 4 · 2019: 2 · 2018: 6 · 2017: 8 · 2016: 8 · 2015: 22 · 2014: 8 · 2013: 17 · 2012: 18
FWCI
9.18
Type
journal article
Language
en
Open access
Locations
  • Endocrinology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • eScholarship (California Digital Library) (submittedVersion)
Funders
  • National Institutes of Health (1u24dk076126-01, 5r01dk073878-05)
  • National Institute of Diabetes and Digestive and Kidney Diseases (DK-083042, U24-DK076126, DK068384, DK 035816, DK052989, DK 047208, R01DK052989, DK-020541, R01DK047208, P01DK068384, R01DK055267, R01-DK-073878, DK-073878, P60DK020541, P30DK035816, P30DK017047, P30DK020541, R01DK083042)
Topics
  • Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
Keywords
leptin signaling, hypothalamus, hepatic insulin sensitivity, vagus nerve, hepatic vagotomy, arcuate nucleus, leptin receptor, hepatic glucose production, gluconeogenesis, glucose-6-phosphatase, PI3K/Akt signaling, IRS-1, energy balance, glucose metabolism
MeSH terms
Animals, Arcuate Nucleus of Hypothalamus, Gluconeogenesis, Glucose, Insulin, Insulin Resistance, Liver, Male, Obesity, Vagotomy, Vagus Nerve, Glucose Clamp Technique, Genetic Therapy, Signal Transduction, Gene Expression, Genes, Reporter, Phosphatidylinositol 3-Kinases, Rats, Receptors, Leptin

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