A crucial role for p90RSK-mediated reduction of ERK5 transcriptional activity in endothelial dysfunction and atherosclerosis.
Abstract | BACKGROUND: METHODS AND RESULTS: Inducible EC-specific ERK5 knockout (ERK5-EKO) mice showed increased leukocyte rolling and impaired vessel reactivity. To examine the role of endothelial ERK5 in atherosclerosis, we used inducible ERK5- EKO-LDLR(-/-) mice and observed increased plaque formation. When activated, p90RSK associated with ERK5, and this association inhibited ERK5 transcriptional activity and upregulated vascular cell adhesion molecule 1 expression. In addition, p90RSK directly phosphorylated ERK5 S496 and reduced endothelial nitric oxide synthase expression. p90RSK activity was increased in diabetic mouse vessels, and fluoromethyl ketone-methoxyethylamine, a specific p90RSK inhibitor, ameliorated EC-leukocyte recruitment and diminished vascular reactivity in diabetic mice. Interestingly, in ERK5-EKO mice, increased leukocyte rolling and impaired vessel reactivity were resistant to the beneficial effects of fluoromethyl ketone-methoxyethylamine, suggesting a critical role for endothelial ERK5 in mediating the salutary effects of fluoromethyl ketone-methoxyethylamine on endothelial dysfunction. Fluoromethyl ketone-methoxyethylamine also inhibited atherosclerosis formation in ApoE(-/-) mice. CONCLUSIONS: Our study highlights the importance of the p90RSK/ERK5 module as a critical mediator of EC dysfunction in diabetes mellitus and atherosclerosis formation, thus revealing a potential new target for therapeutic intervention.
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Authors | Nhat-Tu Le, Kyung-Sun Heo, Yuichiro Takei, Hakjoo Lee, Chang-Hoon Woo, Eugene Chang, Carolyn McClain, Cheryl Hurley, Xin Wang, Faqian Li, Haodong Xu, Craig Morrell, Mark A Sullivan, Michael S Cohen, Iana M Serafimova, Jack Taunton, Keigi Fujiwara, Jun-Ichi Abe |
Journal | Circulation
(Circulation)
Vol. 127
Issue 4
Pg. 486-99
(Jan 29 2013)
ISSN: 1524-4539 [Electronic] United States |
PMID | 23243209
(Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
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Chemical References |
- Amino Acid Chloromethyl Ketones
- Oxidants
- Hydrogen Peroxide
- Nitric Oxide Synthase Type III
- Nos3 protein, mouse
- Ribosomal Protein S6 Kinases, 90-kDa
- Rps6ka1 protein, mouse
- Mitogen-Activated Protein Kinase 7
- Glucose
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Topics |
- Amino Acid Chloromethyl Ketones
(pharmacology)
- Animals
- Atherosclerosis
(drug therapy, metabolism, physiopathology)
- Diabetic Angiopathies
(drug therapy, metabolism, physiopathology)
- Drug Synergism
- Glucose
(pharmacology)
- Human Umbilical Vein Endothelial Cells
- Humans
- Hydrogen Peroxide
(pharmacology)
- Leukocyte Rolling
(physiology)
- Male
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Mutant Strains
- Mitogen-Activated Protein Kinase 7
(genetics, metabolism)
- Nitric Oxide Synthase Type III
(metabolism)
- Oxidants
(pharmacology)
- Phosphorylation
(physiology)
- Rats
- Ribosomal Protein S6 Kinases, 90-kDa
(antagonists & inhibitors, genetics, metabolism)
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