Linked Life Data

1918265

Source:http://linkedlifedata.com/resource/pubmed/id/1918265

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
4
pubmed:dateCreated
1991-11-5
pubmed:abstractText
The lymphocyte function-associated antigen-1 (LFA-1) molecule is a cell surface heterodimeric protein that directly mediates cellular adhesion. However, it remains unclear whether LFA-1 molecules are also involved in transmembrane signaling and in the subsequent regulation of cellular functions. Previous attempts to evaluate this issue have been hampered by (1) the ubiquitous expression of LFA-1 on normal lymphoid cells, (2) the limited availability of assays for cellular activation that are not affected by cellular adhesion, and (3) the difficulties in interpreting studies where anti-LFA-1 mAbs are used to alternatively block or stimulate this antigen. In order to avoid these pitfalls, we first isolated and cloned T lymphocytes from a patient with leukocyte adhesion deficiency (LAD), an inherited disorder in which the defective expression of leukocyte integrins results in the production of LFA-1- T lymphocytes. Different T-cell lines from this patient and from normal individuals were then stimulated through their T-cell antigen receptor complex and were then tested for three aspects of cellular activation: (1) transmembrane signaling (i.e., phosphoinositide turnover), (2) lymphokine secretion (i.e., release of lymphotoxin), and (3) their capacity to mediate cellular cytotoxicity (using murine anti-CD3-producing hybridoma cells as targets). Using assay systems that did not involve LFA-1-mediated adhesion to antigen-presenting cells or target cells, the T-cell lines from the LAD patient were found to be intrinsically defective in all three of these parameters of T cell activation.(ABSTRACT TRUNCATED AT 250 WORDS)
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0271-9142
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
175-83
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1991
pubmed:articleTitle
Defective T-lymphocyte signal transduction and function in leukocyte adhesion deficiency.
pubmed:affiliation
Department of Pediatrics, Mayo Clinic and Foundation, Rochester, Minnesota 55905.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't