acute nitric oxide synthase inhibition and endothelin-1-dependent arterial pressure elevation

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ID: 145416
2014
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Ranked #205 of 333 articles by views in chemical research in chinese universities

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Abstract
Key evidence that endogenous nitric oxide (NO) inhibits the continuous, endothelin (ET)-1-mediated drive to elevate arterial pressure includes demonstrations that ET-1 mediates a significant component of the pressure elevated by acute exposure to NO synthase (NOS) inhibitors. This review examines the characteristics of this pressure elevation in order to elucidate potential mechanisms associated with the negative regulation of ET-1 by NO and, thereby, provide potential insight into the vascular pathophysiology underlying NO dysregulation. We surmise that the magnitude of the ET-1-dependent component of the NOS inhibitor-elevated pressure is 1) independent of underlying arterial pressure and other pressor pathways activated by the NOS inhibitors and 2) dependent on relatively higher NOS inhibitor dose, release of stored and de novo synthesized ET-1, and ETA receptor-mediated increased vascular resistance. Major implications of these conclusions include: 1) the marked variation of the ET-1-dependent component, i.e., from 0-100% of the pressure elevation, reflects the NO-ET-1 regulatory pathway. Thus, NOS inhibitor-mediated, ET-1-dependent pressure elevation in vascular pathophysiologies is an indicator of the level of compromised/enhanced function of this pathway; 2) NO is a more potent inhibitor of ET-1-mediated elevated arterial pressure than other pressor pathways, due in part to inhibition of intravascular pressure-independent release of ET-1. Thus, the ET-1-dependent component of pressure elevation in vascular pathophysiologies associated with NO dysregulation is of greater magnitude at higher levels of compromised NO.
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erapoport2014frontiersacute Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Robert eRapoport
Journal chemical research in chinese universities
Year 2014
DOI
10.3389/fphar.2014.00057
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