Abstract:
:We aimed to investigate the mechanisms underlying the vascular effects induced by phylloquinone (Vitamin K1; VK1). Vascular reactivity experiments, using standard muscle bath procedures, showed that VK1 (5 and 50 microM) enhances the contractile response of endothelium-intact, but not denuded, rat carotid rings to phenylephrine. Similarly, maximal contraction induced by phenylephrine was enhanced in the presence of the nitric oxide (NO) synthase inhibitor NG-nitro-L-arginine methyl ester (L-NAME). The combination of L-NAME and VK1 did not produce any further additional effect. Pre-incubation of intact-rings with VK1 reduced both acetylcholine- and bradykinin-induced relaxation. VK1 induced an increment in tension on carotid rings submaximally pre-contracted with phenylephrine. VK1-induced increment in tension was completely abolished by endothelial removal or incubation of intact rings with L-NAME and L-NNA. Conversely, 7-nitroindazole, 1400 W, or indomethacin did not affect VK1-induced contraction. Moreover, VK1 reduced L-arginine-induced relaxation in endothelium-intact rings. Lucigenin-amplified chemiluminescence assays showed that VK1 induced an increase in the level of superoxide anions in endothelium-intact but not denuded rings. Measurement of nitrite and nitrate generation showed that VK1 did not alter nitrate formation but strongly inhibited the generation of nitrite. Finally, the superoxide anions scavenger tiron prevented the endothelial vasomotor dysfunction caused by VK1 on phenyleprine-induced contraction and acetylcholine or bradykinin-induced relaxation. In conclusion, our data show that VK1 disrupts the vasomotor function of rat carotid. Our results suggest that VK1-induced oxidative stress through production of superoxide anion is interfering with the NO pathway, which in turn is responsible for the altered vascular reactivity induced by VK1.
journal_name
Toxicol Appl Pharmacoljournal_title
Toxicology and applied pharmacologyauthors
Tirapelli CR,De Andrade CR,Lieberman M,Laurindo FR,De Souza HP,de Oliveira AMdoi
10.1016/j.taap.2005.09.001subject
Has Abstractpub_date
2006-05-15 00:00:00pages
10-7issue
1eissn
0041-008Xissn
1096-0333pii
S0041-008X(05)00556-9journal_volume
213pub_type
杂志文章abstract::Colchicine-specific antibody (IgG(C] was tested in mice for reversal of colchicine toxicity. The mouse model was chosen because it reflects human pathophysiology in colchicine poisoning. IgG(C) was administered when at least 85% of colchicine was distributed in tissues. It resulted in a dramatic decrease in lethality ...
journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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journal_title:Toxicology and applied pharmacology
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