Linked Life Data

20634335

Source:http://linkedlifedata.com/resource/pubmed/id/20634335

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pubmed-article:20634335pubmed:abstractTextNitrite-hemoglobin reactions have been studied extensively in vitro, but there is a lack of information on the kinetics of nitrite and its metabolites in humans. In this study, we developed a nine-compartment physiological pharmacokinetic model to describe the in vivo erythrocytic uptake and release and disposition pathways of nitrite, nitrate, methemoglobin, and iron-nitrosyl hemoglobin in the human circulation. Our model revealed that nitrite entered erythrocytes rapidly with a rate constant of 0.256 min(-1) (i.e., half-life = 2.71 min). The formation of iron-nitrosyl hemoglobin from nitrite, which involves the reduction of nitrite by deoxyhemoglobin to generate nitric oxide (NO) and reaction of NO with deoxyhemoglobin to form iron-nitrosyl hemoglobin, occurred rapidly as well (k = 2.02 min(-1); half-life = 0.343 min = 21 s). The disposition kinetics of methemoglobin was complex. Nitrate formation occurred primarily in erythrocytes through the nitrite-oxyhemoglobin reaction and was higher when nitrite was administered intra-arterially than intravenously. Nitrate reduction was an insignificant metabolic pathway. This study is the first to comprehensively evaluate the kinetics of nitrite and its metabolites in humans and provides unique insights into the rapid equilibrium of nitrite into erythrocytes and conversion to NO in the red cell, which is kinetically associated with vasodilation.lld:pubmed
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pubmed-article:20634335pubmed:authorpubmed-author:HonYuen YiYYlld:pubmed
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pubmed-article:20634335pubmed:pagination1707-13lld:pubmed
pubmed-article:20634335pubmed:dateRevised2011-10-19lld:pubmed
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pubmed-article:20634335pubmed:articleTitleCharacterization of erythrocytic uptake and release and disposition pathways of nitrite, nitrate, methemoglobin, and iron-nitrosyl hemoglobin in the human circulation.lld:pubmed
pubmed-article:20634335pubmed:affiliationClinical Center Pharmacy Department, National Institutes of Health, 10 Center Drive, Bethesda, MD 20892, USA. chon@cc.nih.govlld:pubmed
pubmed-article:20634335pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:20634335pubmed:publicationTypeClinical Triallld:pubmed
pubmed-article:20634335pubmed:publicationTypeResearch Support, N.I.H., Intramurallld:pubmed
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