Insulin signalling downstream of protein kinase B is potentiated by 5′AMP-activated protein kinase in rat hearts in vivo
Open accessAbstract
Aims/hypothesis 5'AMP-activated protein kinase (AMPK) and insulin stimulate glucose transport in heart and muscle. AMPK acts in an additive manner with insulin to increase glucose uptake, thereby suggesting that AMPK activation may be a useful strategy for ameliorating glucose uptake, especially in cases of insulin resistance. In order to characterise interactions between the insulin- and AMPK-signalling pathways, we investigated the effects of AMPK activation on insulin signalling in the rat heart in vivo.Methods Male rats (350-400 g) were injected with 1 g/kg 5-aminoimidazole-4-carboxamide-1-beta-D-ribofuranoside (AICAR) or 250 mg/kg metformin in order to activate AMPK. Rats were administered insulin 30 min later and after another 30 min their hearts were removed. The activities and phosphorylation levels of components of the insulin-signalling pathway were subsequently analysed in individual rat hearts.Results AICAR and metformin administration activated AMPK and enhanced insulin signalling downstream of protein kinase B in rat hearts in vivo. Insulin-induced phosphorylation of glycogen synthase kinase 3 (GSK3) beta, p70 S6 kinase (p70S6K)(Thr389) and IRS1(Ser636/639) were significantly increased following AMPK activation. To the best of our knowledge, this is the first report of heightened insulin responses of GSK3beta and p70S6K following AMPK activation. In addition, we found that AMPK inhibits insulin stimulation of IRS1-associated phosphatidylinositol 3-kinase activity, and that AMPK activates atypical protein kinase C and extracellular signal-regulated kinase in the heart.Conclusions/interpretations Our data are indicative of differential effects of AMPK on the activation of components in the cardiac insulin-signalling pathway. These intriguing observations are critical for characterisation of the crosstalk between AMPK and insulin signalling.
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AMPK regulates IRS-1 and Akt/PKB, whereas insulin and Akt have negative impacts on AMPK activation in adipocytes.
“It has been reported that AMPK regulates IRS-1 and Akt/PKB (23), whereas insulin and Akt have negative impacts on AMPK activation in adipocytes (6).”
From Hypoglycemic effects of brassinosteroid in diet-induced obese mice (2012) · cites this paper as [23]
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Ho, L., Yemul, S., Knable, L., Katsel, P., Zhao, R., Haroutunian, V., & Pasinetti, G. M. (2012) · International Journal of Alzheimer's Disease · doi:10.1155/2012/321280 · Cited by 21 · see citing works
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- Authors
- Longnus, S. L., Ségalen, C., Giudicelli, J., Sajan, M. P., Farese, R. V., & Van Obberghen, E.
- Affiliations
- Inserm (FR)
- University of South Florida (US)
- Venue
- Diabetologia
- Published
- 2005-11-11
- Volume
- 48
- Issue
- 12
- Pages
- 2591-2601
- ISSN
- 0012-186X (ISSN-L)
- 1432-0428
- OpenAlex
- W1986364902
- Cited by
- 58
- References
- 83
- Citations by year
- 2026: 1 · 2024: 1 · 2023: 1 · 2021: 1 · 2020: 2 · 2019: 1 · 2018: 2 · 2017: 2 · 2016: 4 · 2015: 1 · 2014: 4 · 2013: 4 · 2012: 7
- FWCI
- 1.99
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Diabetologia (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Institut National de la Santé et de la Recherche Médicale
- National Institutes of Health
- National Institute of Diabetes and Digestive and Kidney Diseases (R01DK065969, R01-DK065969-01A1)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Metabolism, Diabetes, and Cancer
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › PI3K/AKT/mTOR signaling in cancer
- Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Natural Antidiabetic Agents Studies
- Keywords
- AMPK, insulin signaling, Akt, glycogen synthase kinase-3β, p70 S6 kinase, IRS-1, phosphatidylinositol 3-kinase, atypical protein kinase C, extracellular signal-regulated kinase, glucose uptake, AICAR, metformin, insulin resistance
- MeSH terms
- Glycogen Synthase Kinase 3 beta, Aminoimidazole Carboxamide, Animals, Blood Glucose, Enzyme Activation, Heart, Insulin, Male, Metformin, Multienzyme Complexes, Myocardium, Phosphoproteins, Phosphorylation, Protein Kinase C, Ribonucleotides, Signal Transduction, Rats, Sprague-Dawley, Protein Serine-Threonine Kinases, Phosphatidylinositol 3-Kinases, Glycogen Synthase Kinase 3, Ribosomal Protein S6 Kinases, 70-kDa, Mitogen-Activated Protein Kinase 3, Proto-Oncogene Proteins c-akt, Rats, AMP-Activated Protein Kinases, Insulin Receptor Substrate Proteins
About these checks
Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.
Statistics and arithmetic are recomputed, not judged.
Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.
What counts as a claim ›How we measure confidence ›How we check this ›
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