Linked Life Data

17304104

Source:http://linkedlifedata.com/resource/pubmed/id/17304104

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
2007-2-16
pubmed:abstractText
Hypertonic saline (HS) treatment promotes interleukin (IL)-2 production and enhances T-cell activation by the release of cellular adenosine triphosphate (ATP) that activates P2 nucleotide receptors. Released ATP can be hydrolyzed to adenosine, which inhibits T-cell activation. We examined if adenosine affects the response of T cells to HS treatment, and found that the amount of ATP released from T cells is a function of the HS concentration and duration of HS exposure. Physiologically relevant HS concentrations (<40 mmol/L) induced rapid ATP release, with the highest ATP concentrations released within 1 min. The released ATP was converted to adenosine, which opposed the enhancing effects of HS on IL-2 production. We found that Jurkat and CD4+ primary human T cells express most abundantly the A2A and A2B adenosine receptor subtypes, which mediate the suppressive effects of adenosine, as the A2 receptor agonist CGS 21680 suppressed IL-2 production, whereas the A2 receptor antagonist 3,7-dimethyl-1-(2-propynyl)xanthine augmented the enhancing effect of HS on T-cell function. Elimination of extracellular adenosine by adding exogenous adenosine deaminase also increased the enhancing effects of HS. These data suggest that the effect of HS treatment on T-cell function can be modulated with pharmacological agents that abolish the suppressive effects of adenosine formed from the ATP that is released in response to HS treatment.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1073-2322
pubmed:author
pubmed:issnType
Print
pubmed:volume
27
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
242-50
pubmed:dateRevised
2008-11-21
pubmed:meshHeading
pubmed:year
2007
pubmed:articleTitle
Hypertonic stress regulates T-cell function by the opposing actions of extracellular adenosine triphosphate and adenosine.
pubmed:affiliation
Surgical Immunology Research Laboratory, Department of Surgery, Division of Trauma, University of California San Diego, San Diego, California 92103-8236, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, N.I.H., Extramural