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Activation of Endothelial Nitric-oxide Synthase by the p38 MAPK in Response to Black Tea Polyphenols
Open accessAbstract
Black tea improves endothelial function in patients with coronary artery disease. We sought to determine the responsible components of black tea and elucidate the underlying cell signaling mechanisms. We exposed porcine aortic endothelial cells to components of black tea and found that the polyphenol fraction acutely enhanced nitric oxide bioactivity. This effect involved endothelial nitric-oxide synthase (eNOS) phosphorylation at Ser-1177 and dephosphorylation at Thr-495, consistent with increased eNOS activity. These effects were calcium-dependent, as removal of extracellular calcium prevented eNOS phosphorylation at Ser-1177, whereas inhibition of intracellular calcium mobilization with TMB-8 blunted Thr-495 dephosphorylation. Black tea polyphenol-induced eNOS activation appeared dependent upon the phosphatidylinositol 3-kinase-Akt pathway, as it was significantly inhibited by LY294002 and a dominant negative Akt, respectively. Pharmacological inhibition of p38 mitogen-activated protein kinase (p38 MAPK) with either SB202190 or SB203580 as well as overexpression of a dominant negative p38 MAPKalpha attenuated both eNOS activation and phosphorylation changes in response to black tea polyphenols. Inhibition of p38 MAPKalpha also blunted Akt activation in response to black tea polyphenols, suggesting that p38alpha MAPK is upstream of Akt in this pathway. Finally, a constitutively active mutant of MKK6bE, an upstream kinase for p38 MAPK, enhanced both the basal and stimulated activity of Akt, leading to increased eNOS activity. Taken together, these data identify the p38 MAPK as an upstream component of Akt-mediated eNOS activation.
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“The effects of these dietary components can be, in part, due to the interaction with different enzymatic systems (30, 558, 824), but the link between these compounds and NO formation deserves further investigation (600, 789).”
From Sources of Vascular Nitric Oxide and Reactive Oxygen Species and Their Regulation (2019) · cites this paper as [30]
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Metadata
- Authors
- Anter, E., Thomas, S. R., Schulz, E., Shapira, O. M., Vita, J. A., & Keaney, J. F.
- Affiliations
- Boston University (US)
- Corresponding author
- Keaney, John F.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2004-11
- Volume
- 279
- Issue
- 45
- Pages
- 46637-46643
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1998394852
- Cited by
- 142
- References
- 37
- Citations by year
- 2026: 2 · 2024: 5 · 2022: 3 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 4 · 2017: 6 · 2016: 6 · 2015: 6 · 2014: 6 · 2013: 8 · 2012: 11
- FWCI
- 5.34
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Biological Chemistry (publishedVersion, cc-by)
- PubMed (publishedVersion)
- Funders
- National Institutes of Health (5r01dk055656-03)
- National Heart, Lung, and Blood Institute (K02HL067206, P01HL060886, HL68758, HL 67206, P01HL068758, HL-60886)
- National Institute of Diabetes and Digestive and Kidney Diseases (DK-55656)
- Topics
- Health Sciences › Medicine › Physiology (medical) › Nitric Oxide and Endothelin Effects
- Life Sciences › Agricultural and Biological Sciences › Food Science › Tea Polyphenols and Effects
- Health Sciences › Medicine › Biochemistry (medical) › Phytochemicals and Antioxidant Activities
- Keywords
- black tea polyphenols, endothelial nitric oxide synthase, p38 MAPK, Akt signaling, eNOS phosphorylation, nitric oxide bioactivity, endothelial function, phosphatidylinositol 3-kinase, calcium signaling, coronary artery disease, porcine aortic endothelial cells
- MeSH terms
- Adenoviridae, Animals, Aorta, Arginine, Calcium, Calmodulin, Catalysis, Citrulline, Endothelium, Vascular, Enzyme Activation, Enzyme Inhibitors, Flavonoids, Genetic Vectors, Imidazoles, Mutation, Nitric Oxide, Phenols, Phosphorylation, Pyridines, Swine, Tea, Time Factors, Transfection, Blotting, Western, Signal Transduction, Nitric Oxide Synthase, Phosphatidylinositol 3-Kinases, Immunoprecipitation, p38 Mitogen-Activated Protein Kinases, Nitric Oxide Synthase Type III, Polyphenols
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