PI3K integrates the action of insulin and leptin on hypothalamic neurons
Open accessAbstract
Central control of energy balance depends on the ability of proopiomelanocortin (POMC) or agouti-related protein (Agrp) hypothalamic neurons to sense and respond to changes in peripheral energy stores. Leptin and insulin have been implicated as circulating indicators of adiposity, but it is not clear how changes in their levels are perceived or integrated by individual neuronal subtypes. We developed mice in which a fluorescent reporter for PI3K activity is targeted to either Agrp or POMC neurons and used 2-photon microscopy to measure dynamic regulation of PI3K by insulin and leptin in brain slices. We show that leptin and insulin act in parallel to stimulate PI3K in POMC neurons but in opposite ways on Agrp neurons. These results suggest a new view of hypothalamic circuitry, in which the effects of leptin and insulin are integrated by anorexigenic but not by orexigenic neurons.
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Leptin inhibits the firing rate of NPY/AgRP neurons, depolarizes POMC neurons, and activates PI3K signaling in POMC cells.
“leptin inhibits the firing rate of NPY/AgRP neurons (189), while simultaneously depolarizing POMC neurons (42), and also activates PI3K signaling in the latter cells (204).”
From Leptin and the Central Nervous System Control of Glucose Metabolism (2011) · cites this paper as [204]
Insulin hyperpolarizes and silences both AgRP and POMC neurons and activates PI3K signaling in both.
“insulin hyperpolarizes and silences both AgRP and POMC neurons (96) and activates PI3K signaling in both these neuronal populations (204).”
From Leptin and the Central Nervous System Control of Glucose Metabolism (2011) · cites this paper as [204]
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- Authors
- Xu, A. W.
- Affiliations
- Stanford Medicine (US)
- ORCID
- Xu, A. W.
- Venue
- Journal of Clinical Investigation
- Published
- 2005-03-10
- Volume
- 115
- Issue
- 4
- Pages
- 951-958
- ISSN
- 0021-9738 (ISSN-L)
- PMC
- PMC1062894
- OpenAlex
- W2161418574
- Cited by
- 420
- References
- 54
- Citations by year
- 2026: 2 · 2025: 10 · 2024: 8 · 2023: 8 · 2022: 12 · 2021: 7 · 2020: 7 · 2019: 18 · 2018: 17 · 2017: 24 · 2016: 20 · 2015: 18 · 2014: 24 · 2013: 27 · 2012: 27
- FWCI
- 12.61
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Journal of Clinical Investigation (publishedVersion)
- PubMed Central (publishedVersion)
- Europe PMC (PubMed Central) (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health
- School of Medicine, Stanford University
- Stanford Bio-X
- National Institute of Diabetes and Digestive and Kidney Diseases (DK-48506, R01DK048506, P01DK068384, DK-68384)
- Topics
- Life Sciences › Neuroscience › Endocrine and Autonomic Systems › Regulation of Appetite and Obesity
- Health Sciences › Medicine › Reproductive Medicine › Hypothalamic control of reproductive hormones
- Health Sciences › Medicine › Epidemiology › Adipokines, Inflammation, and Metabolic Diseases
- Keywords
- PI3K signaling, insulin, leptin, hypothalamic neurons, proopiomelanocortin neurons, energy balance, appetite regulation, anorexigenic neurons, orexigenic neurons, neuronal activity imaging
- MeSH terms
- Animals, Energy Metabolism, Enzyme Activation, Homeostasis, Hypothalamus, Insulin, Mice, Inbred C57BL, Mice, Transgenic, Synaptic Transmission, Neurons, Pro-Opiomelanocortin, Proteins, Recombinant Fusion Proteins, Gene Expression Regulation, Enzymologic, Genes, Reporter, Mice, Knockout, Microscopy, Confocal, Phosphatidylinositol 3-Kinases, Leptin, Intercellular Signaling Peptides and Proteins, Mice, Agouti-Related Protein
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