Regulation of Vascular Endothelial Growth Factor Expression and Vascularization in the Myocardium by Insulin Receptor and PI3K/Akt Pathways in Insulin Resistance and Ischemia
Abstract
Objective— This study characterized the role of insulin receptors and resistance on vascular endothelial growth factor (VEGF) expression and myocardial vascularization in physiological conditions and after ischemia. Methods and Results— Cardiac microvascular density was reduced by 30% in insulin-resistant Zucker fatty rats versus lean controls. This was associated with a parallel 40% inhibition of insulin-stimulated activation of both Akt and VEGF expression in the myocardium and cardiomyocytes. In contrast, the activation of Erk1/2 by insulin remained unchanged. In cultured cardiomyocytes, insulin or insulin-like growth factor (IGF)-1 increased VEGF mRNA and protein expression by 2-fold. Inhibition of PI3K/Akt, especially Akt2-mediated cascades but not the Ras/MEK/Erk pathway, using chemical inhibitors, dominant negative adenoviral constructs, or siRNA approaches suppressed VEGF mRNA expression by insulin. Ventricular tissues from muscle insulin receptor knockout (MIRKO) mice, which lack insulin receptors in the myocardium, have significant reductions in insulin but not IGF-1 signaling, VEGF expression, and vascular density before and after ischemia versus controls. Conclusions— Insulin regulates VEGF gene expression and vascularization in the myocardium specifically via insulin receptors and the activation of PI3K/Akt pathway. Selective inhibition of this pathway may lead to the decreases in VEGF expression and capillary density in the myocardium of patients with insulin resistance.
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Impaired angiogenic signaling was confirmed in hearts of Zucker rats and in muscle-restricted insulin receptor KO mice lacking myocardial insulin receptor expression.
“Impaired angiogenic signaling was also independently confirmed in the hearts of Zucker rats and in muscle-restricted insulin receptor KO mice that also lack insulin receptor expression in the myocardium (133, 349).”
From Cardiac remodeling in obesity (2008) · cites this paper as [133]
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- Authors
- He, Z., Opland, D. M., Way, K. J., Ueki, K., Bodyak, N., Kang, P. M., Izumo, S., Kulkarni, R. N., Wang, B., Liao, R., Kahn, C. R., & King, G. L.
- Affiliations
- Boston University (US)
- ORCID
- Venue
- Arteriosclerosis, Thrombosis, and Vascular Biology
- Published
- 2006-04
- Volume
- 26
- Issue
- 4
- Pages
- 787-793
- ISSN
- 1079-5642 (ISSN-L)
- 1524-4636
- OpenAlex
- W2141397996
- Cited by
- 94
- References
- 33
- Citations by year
- 2026: 2 · 2025: 1 · 2024: 3 · 2023: 5 · 2022: 1 · 2021: 6 · 2020: 5 · 2019: 5 · 2018: 3 · 2017: 3 · 2016: 5 · 2015: 4 · 2014: 2 · 2013: 5 · 2012: 3
- FWCI
- 3.27
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Arteriosclerosis Thrombosis and Vascular Biology (publishedVersion)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r01dk059725-05)
- National Institute of Diabetes and Digestive and Kidney Diseases (R01 DK 53105, R01DK053105, DK02885-03, K08DK002885, R01 DK59725)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Angiogenesis and VEGF in Cancer
- Health Sciences › Medicine › Pathology and Forensic Medicine › Cardiac Ischemia and Reperfusion
- Health Sciences › Medicine › Physiology › Nitric Oxide and Endothelin Effects
- Keywords
- vascular endothelial growth factor, insulin resistance, myocardial vascularization, insulin receptor, PI3K/Akt signaling, AKT2, cardiomyocytes, myocardial ischemia, insulin-like growth factor I, ERK signaling, Zucker fatty rats
- MeSH terms
- Wortmannin, Phosphoinositide-3 Kinase Inhibitors, Androstadienes, Animals, Cells, Cultured, Coronary Vessels, Flavonoids, Humans, Insulin, Insulin Resistance, Male, Neovascularization, Pathologic, Rats, Zucker, Receptor, Insulin, Signal Transduction, Myocardial Ischemia, Phosphatidylinositol 3-Kinases, Myocytes, Cardiac, Vascular Endothelial Growth Factor A, Protein Kinase Inhibitors, Proto-Oncogene Proteins c-akt, Mice, Rats
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