Please use this identifier to cite or link to this item: https://doi.org/10.1530/JME-11-0082
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dc.titleChronic exposure to high fatty acids impedes receptor agonist-induced nitric oxide production and increments of cytosolic Ca 2+ levels in endothelial cells
dc.contributor.authorTang, Y.
dc.contributor.authorLi, G.
dc.date.accessioned2014-11-25T09:44:21Z
dc.date.available2014-11-25T09:44:21Z
dc.date.issued2011-12
dc.identifier.citationTang, Y., Li, G. (2011-12). Chronic exposure to high fatty acids impedes receptor agonist-induced nitric oxide production and increments of cytosolic Ca 2+ levels in endothelial cells. Journal of Molecular Endocrinology 47 (3) : 315-326. ScholarBank@NUS Repository. https://doi.org/10.1530/JME-11-0082
dc.identifier.issn09525041
dc.identifier.urihttp://scholarbank.nus.edu.sg/handle/10635/108297
dc.description.abstractDyslipidemia is a common metabolic disorder in diabetes. Nitric oxide (NO) production from endothelium plays the primary role in endothelium-mediated vascular relaxation and other endothelial functions. Therefore, we investigated the effects of elevated free fatty acids (FFA) on the stimulation of NO production by phospholipase C (PLC)-activating receptor agonists (potent physiological endothelium-dependent vasodilators) and defined the possible alterations of signaling pathways implicated in this scenario. Exposure of bovine aortic endothelial cells (BAECs) to high concentrations of a mixture of fatty acids (oleate and palmitate) for 5 or 10 days significantly reduced NO production evoked by receptor agonists (bradykinin or ATP) in a time- and dose-dependent manner. Such defects were not associated with alterations of either endothelial NO synthase mass or inositol phospholipid contents but were probably due to reduced elevations of intracellular free Ca 2+ levels ([Ca 2+] i) under these conditions. Exposure of BAECs to FFA significantly attenuated agonist-induced [Ca 2+] i increases by up to 54% in a dose- and time-dependent manner. Moreover, bradykinin receptor affinity on the cell surface was significantly decreased by high concentrations of FFA. The morphology of BAECs was altered after 10-day culture with high FFA. Co-culture with protein kinase C (PKC) inhibitors or antioxidants was able to reverse the impairments of receptor agonist-induced NO production and [Ca 2+] i rises as well as the alteration of receptor affinity in BAECs exposed to FFA. These data indicate that chronic exposure to high FFA reduces NO generation in endothelial cells probably by impairing PLC-mediated Ca 2+ signaling pathway through activation of PKC and excess generation of oxidants. © 2011 Society for Endocrinology.
dc.description.urihttp://libproxy1.nus.edu.sg/login?url=http://dx.doi.org/10.1530/JME-11-0082
dc.sourceScopus
dc.typeArticle
dc.contributor.departmentMEDICINE
dc.description.doi10.1530/JME-11-0082
dc.description.sourcetitleJournal of Molecular Endocrinology
dc.description.volume47
dc.description.issue3
dc.description.page315-326
dc.description.codenJMLEE
dc.identifier.isiut000300298000007
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