Modulatory Effect of 2-(4-Hydroxyphenyl)amino-1,4-naphthoquinone on Endothelial Vasodilation in Rat Aorta

Javier Palacios, Fredi Cifuentes, Jaime A. Valderrama, Julio Benites, David Ríos, Constanza González, Mario Chiong, Benjamín Cartes-Saavedra, Carlos Lafourcade, Ursula Wyneken, Pamela González, Gareth I. Owen, Fabián Pardo, Luis Sobrevia, Pedro Buc Calderon*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The vascular endothelium plays an essential role in the control of the blood flow. Pharmacological agents like quinone (menadione) at various doses modulate this process in a variety of ways. In this study, Q7, a 2-phenylamino-1,4-naphthoquinone derivative, significantly increased oxidative stress and induced vascular dysfunction at concentrations that were not cytotoxic to endothelial or vascular smooth muscle cells. Q7 reduced nitric oxide (NO) levels and endothelial vasodilation to acetylcholine in rat aorta. It also blunted the calcium release from intracellular stores by increasing the phenylephrine-induced vasoconstriction when CaCl2 was added to a calcium-free medium but did not affect the influx of calcium from extracellular space. Q7 increased the vasoconstriction to BaCl2 (10-3 M), an inward rectifying K+ channels blocker, and blocked the vasodilation to KCl (10-2 M) in aortic rings precontracted with BaCl2. This was recovered with sodium nitroprusside (10-8 M), a NO donor. In conclusion, Q7 induced vasoconstriction was through a modulation of cellular mechanisms involving calcium fluxes through K+ channels, and oxidative stress induced endothelium damage. These findings contribute to the characterization of new quinone derivatives with low cytotoxicity able to pharmacologically modulate vasodilation.

Original languageEnglish
Article number3939540
JournalOxidative Medicine and Cellular Longevity
StatePublished - 2016

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Publisher Copyright:
© 2016 Javier Palacios et al.


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