Title : Ascorbate stimulates endothelial nitric oxide synthase enzyme activity by rapid modulation of its phosphorylation status.

Pub. Date : 2012 May 15

PMID : 22542797






10 Functional Relationships(s)
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1 Ascorbate stimulates endothelial nitric oxide synthase enzyme activity by rapid modulation of its phosphorylation status. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
2 Long-term exposure to ascorbate is known to enhance endothelial nitric oxide synthase (eNOS) activity by stabilizing the eNOS cofactor tetrahydrobiopterin (BH4). Ascorbic Acid nitric oxide synthase 3 Homo sapiens
3 Long-term exposure to ascorbate is known to enhance endothelial nitric oxide synthase (eNOS) activity by stabilizing the eNOS cofactor tetrahydrobiopterin (BH4). Ascorbic Acid nitric oxide synthase 3 Homo sapiens
4 Long-term exposure to ascorbate is known to enhance endothelial nitric oxide synthase (eNOS) activity by stabilizing the eNOS cofactor tetrahydrobiopterin (BH4). Ascorbic Acid nitric oxide synthase 3 Homo sapiens
5 We investigated acute effects of ascorbate on eNOS function in primary (HUVEC) and immortalized human endothelial cells (EA.hy926), aiming to provide a molecular explanation for the rapid vasodilatation seen in vivo upon administration of ascorbate. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
6 Over a period of 4h, ascorbate steadily increased eNOS activity, although endothelial BH4 levels remained unchanged compared to untreated control cells. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
7 Immunoblot analyses revealed that as early as 5 min after treatment ascorbate dose-dependently increased phosphorylation at eNOS-Ser1177 and concomitantly decreased phosphorylation at eNOS-Thr495, a phosphorylation pattern indicative of increased eNOS activity. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
8 Immunoblot analyses revealed that as early as 5 min after treatment ascorbate dose-dependently increased phosphorylation at eNOS-Ser1177 and concomitantly decreased phosphorylation at eNOS-Thr495, a phosphorylation pattern indicative of increased eNOS activity. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
9 Immunoblot analyses revealed that as early as 5 min after treatment ascorbate dose-dependently increased phosphorylation at eNOS-Ser1177 and concomitantly decreased phosphorylation at eNOS-Thr495, a phosphorylation pattern indicative of increased eNOS activity. Ascorbic Acid nitric oxide synthase 3 Homo sapiens
10 In this report, we unravel a novel mechanism for how ascorbate rapidly activates eNOS independent of its effects on BH4 stabilization. Ascorbic Acid nitric oxide synthase 3 Homo sapiens