Linked Life Data

6381484

Source:http://linkedlifedata.com/resource/pubmed/id/6381484

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
16
pubmed:dateCreated
1984-9-28
pubmed:abstractText
Isolated human neutrophilic leukocytes were stimulated to produce hydrogen peroxide (H2O2) and to secrete cytoplasmic granule components including myeloperoxidase into the medium. Myeloperoxidase catalyzed the oxidation of chloride (Cl-) by H2O2 to yield hypochlorous acid (HOCl), which reacted with endogenous nitrogen compounds to yield derivatives containing nitrogen-chlorine (N-Cl) bonds. Compounds available for reaction with HOCl were ammonia (NH+4), taurine, alpha-amino acids, and granule proteins and peptides that were released into the medium. A portion of the N-Cl derivatives formed under these conditions accumulated in the extracellular medium. These long lived oxidizing agents were characterized as hydrophilic, low molecular weight, mono-N-chloramine (RNHCl) derivatives based on their absorption spectrum, ability to oxidize 5-thio-2-nitrobenzoic acid and to chlorinate ammonia (NH+4), and behavior upon ultrafiltration, gel chromatography, and extraction with organic solvents. The RNHCl derivatives were of low toxicity, but reacted with NH+4 to yield the lipophilic oxidizing agent monochloramine (NH2Cl). Therefore, the addition of NH+4 conferred bactericidal, cytotoxic, and cytolytic activities on the RNHCl derivatives. The results indicate that taurine and other neutrophil amines protect neutrophils and other cells against oxidative attack by acting as a trap for HOCl and by competing with endogenous NH+4 for reaction with HOCl. However, the RNHCl derivatives act as a reserve of oxidizing equivalents that is converted to a toxic form when an increase in NH+4 concentration favors formation of NH2Cl.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
0021-9258
pubmed:author
pubmed:issnType
Print
pubmed:day
25
pubmed:volume
259
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
10404-13
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1984
pubmed:articleTitle
Chlorination of endogenous amines by isolated neutrophils. Ammonia-dependent bactericidal, cytotoxic, and cytolytic activities of the chloramines.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't