Linked Life Data

7692988

Source:http://linkedlifedata.com/resource/pubmed/id/7692988

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1993-12-3
pubmed:abstractText
We studied the effect of a 4-hr preexposure to LPS on the ability of human monocytes to respond to a subsequent stimulation with LPS in terms of cytokine production. LPS-preexposed monocytes did not produce TNF on LPS restimulation, but they retained the ability to produce IL-1 beta, IL-6, and IL-8. LPS-tolerant monocytes were still capable of producing TNF when restimulated with zymosan. Down-regulation of TNF by LPS tolerance was also evident at the mRNA level. To investigate the possible mechanisms underlying this phenomenon, we also studied the effect of LPS preexposure on membrane CD14, which was suggested to be an LPS receptor, and on intracellular cAMP, an inhibitor of TNF production. LPS induced a 50% decrease in CD14 expression. On the other hand, the increase in cAMP levels by LPS was not affected by preexposure to LPS. In conclusion, (a) TNF is more rapidly down-regulated than IL-1 beta, IL-6, and IL-8 during LPS tolerance in vitro; (b) early LPS tolerance is associated with decreased CD14, which might partially explain the decreased LPS response; and (c) a feedback mechanism controlling TNF synthesis, cAMP elevation, is not down-regulated in LPS tolerance.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Aug
pubmed:issn
1056-5477
pubmed:author
pubmed:issnType
Print
pubmed:volume
12
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
231-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Early down-regulation of TNF production by LPS tolerance in human monocytes: comparison with IL-1 beta, IL-6, and IL-8.
pubmed:affiliation
Istituto di Ricerche Farmacologiche Mario Negri, Milano, Italy.
pubmed:publicationType
Journal Article, In Vitro, Research Support, Non-U.S. Gov't