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Ceruloplasmin is a NO oxidase and nitrite synthase that determines endocrine NO homeostasis.

Abstract：

:Nitrite represents a bioactive reservoir of nitric oxide (NO) that may modulate vasodilation, respiration and cytoprotection after ischemia-reperfusion injury. Although nitrite formation is thought to occur via reaction of NO with oxygen, this third-order reaction cannot compete kinetically with the reaction of NO with hemoglobin to form nitrate. Indeed, the formation of nitrite from NO in the blood is limited when plasma is substituted with physiological buffers, which suggests that plasma contains metal-based enzymatic pathways for nitrite synthesis. We therefore hypothesized that the multicopper oxidase, ceruloplasmin, could oxidize NO to NO+, with subsequent hydration to nitrite. Accordingly, plasma NO oxidase activity was decreased after ceruloplasmin immunodepletion, in ceruloplasmin knockout mice and in people with congenital aceruloplasminemia. Compared to controls, plasma nitrite concentrations were substantially reduced in ceruloplasmin knockout mice, which were more susceptible to liver infarction after ischemia and reperfusion. The extent of hepatocellular infarction normalized after nitrite repletion. These data suggest new functions for the multicopper oxidases in endocrine NO homeostasis and nitrite synthesis, and they support the hypothesis that physiological concentrations of nitrite contribute to hypoxic signaling and cytoprotection.

journal_name

Nat Chem Biol

journal_title

Nature chemical biology

authors

Shiva S,Wang X,Ringwood LA,Xu X,Yuditskaya S,Annavajjhala V,Miyajima H,Hogg N,Harris ZL,Gladwin MT

doi

10.1038/nchembio813

subject

Has Abstract

pub_date

2006-09-01 00:00:00

pages

486-93

issue

9

eissn

1552-4450

issn

1552-4469

pii

nchembio813

journal_volume

2

pub_type

杂志文章

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