Linked Life Data

8779996

Source:http://linkedlifedata.com/resource/pubmed/id/8779996

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2 Pt 1
pubmed:dateCreated
1996-12-20
pubmed:abstractText
We examined the effects of nitrogen dioxide (NO2) on guinea pig tracheobronchial (GPTE) ouabain-sensitive 86Rb uptake, as an index of Na+,K(+)-ATPase activity, and specific [3H]ouabain binding. A 1-h exposure of GPTE monolayers to 5 ppm NO2 increased ouabain-sensitive 86Rb uptake (nmol.mg protein-1.30 min-1) to 512 +/- 39 compared with an air-control value of 278 +/- 20. Similarly, 1 ppm NO2 increased 86Rb uptake to 336 +/- 19 from an air control of 219 +/- 31. The specific [3H]ouabain-binding capacity (Bmax) for monolayers exposed to 5 ppm NO2 was increased to 23.2 +/- 1.2 pmol/mg protein in comparison with an air-control value of 18.4 +/- 0.4; however, there was no change at 1 ppm NO2. Binding constants (Kd) for 1 or 5 ppm NO2 were increased to 0.64 +/- 0.02 and 0.79 +/- 0.08 microM, respectively, in comparison with an air-control value of 0.53 +/- 0.02 microM. Changes of Bmax and Kd may be consistent with a recruitment of latent pumps to the basolateral cell plasma membrane and/or increased turnover of the sodium pump. However, the increase of Bmax was no more than 126% of the air control, while 86Rb uptake increased to 184%, suggesting that an increased turnover is the more predominant effect. Incubation of GPTE monolayers during NO2 exposure with nordihydroguaiaretic acid, an antioxidant, blocked the increase of ouabain-sensitive 86Rb uptake almost completely and partially protected transepithetial resistance, suggesting that lipid peroxidation processes may play a role in alterations of airway epithelial barrier and active ion transport properties.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
0002-9513
pubmed:author
pubmed:issnType
Print
pubmed:volume
270
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
L266-72
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1996
pubmed:articleTitle
Enhancement of airway epithelial Na+,K(+)-ATPase activity by NO2 and protective role of nordihydroguaiaretic acid.
pubmed:affiliation
Department of Molecular Pharmacology and Toxicology, University of Southern California, Los Angeles 90033, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't