Linked Life Data

8370081

Source:http://linkedlifedata.com/resource/pubmed/id/8370081

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-10-14
pubmed:abstractText
The murine autosomal recessive gene, lpr, induces a progressive lymphadenopathy and lupus-like autoimmune syndrome characterized by the accumulation of immature, dull Thy 1.2+, TCR+, L3T4-/Lyt 2- (double-negative, DN) T cells in peripheral lymphoid organs. Previous studies demonstrated that the thymic microenvironment is required for the generation of the abnormal, peripheral DN T cells, while a more recent report linked the lpr gene defect with a failure of thymocytes to express a functional form of the Fas antigen, which mediates apoptosis. Thus, the lpr gene defect apparently prevents lpr thymocytes from responding to the ordered sequence of differentiation and proliferation signals involved in normal thymocyte maturation and selection. We compared the responses of thymocytes from C57BL/6 +/+ (normal) and congenic C57BL/6 lpr/lpr (lpr) mice to a thymic stromal cell product which down-regulates DNA synthesis in vitro. The results indicate that (a) thymic stromal cells from lpr mice produce a factor that can down-regulate DNA synthesis as efficiently as that from normal mice, even at an age when massive lymphadenopathy is present, (b) mitogen-stimulated thymocytes of normal, but not lpr, mice are sensitive to the inhibitory factor, (c) normal DN thymocytes are the cellular target of the inhibitory factor, which acts at some postmembrane receptor-ligand binding event during mitogen-stimulated proliferation, and (d) IL-4-dependent DN thymocyte proliferation seems to be the main target of the inhibitory factor.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Sep
pubmed:issn
0008-8749
pubmed:author
pubmed:issnType
Print
pubmed:volume
150
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
425-38
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Double-negative (L3T4-, Lyt2-) thymocytes of autoimmune lpr/lpr mice are resistant to down-regulation of DNA synthesis by a thymic stromal cell product.
pubmed:affiliation
Geriatric Research, Education and Clinical Center (GRECC), VA Medical Center West Los Angeles, California 90073.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't