Linked Life Data

7534788

Source:http://linkedlifedata.com/resource/pubmed/id/7534788

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
7
pubmed:dateCreated
1995-4-27
pubmed:abstractText
Recent evidence indicates that integrins do transduce signals that are involved in the regulation of a number of cellular processes. We have shown previously that human NK cells express alpha 4 beta 1 and alpha 5 beta 1 integrins, which mediate their adhesion to fibronectin (FN). Here we investigate whether cross-linking of beta 1 FN receptors on human NK cells stimulates tyrosine kinase activation. Our results indicate that cross-linking of beta 1 integrins on NK cells, either freshly isolated from PBL or generated from 10-day coculture of nonadherent PBMC with an irradiated EVB+ lymphoblastoid B cell line (long-term activated NK cells), altered the tyrosine phosphorylation pattern. In particular, we found stimulation of tyrosine phosphorylation of two proteins migrating with an apparent mass of 105 and 115 kDa, which was not observed after CD16 engagement. Phosphorylation of pp105-115 was already observed at 1 min, raised maximal values at 3 to 5 min, and persisted until 20 min after stimulation. Tyrosine phosphorylation of pp105-115 was also observed upon engagement of alpha 4 beta 1 and alpha 5 beta 1 FN receptors either with mAb directed against the alpha subunits or after NK cell adhesion to FN or its 120- and 40-kDa fragments. Pretreatment of NK cells with the tyrosine kinase inhibitor herbimycin A resulted in marked decrease of phosphorylation stimulated through alpha 4 beta 1 and alpha 5 beta 1 integrins, indicating that ligation of FN receptors on NK cells activates tyrosine kinase(s). Overall our results suggest that beta 1 integrins on NK cells play a major role as signaling molecules in the regulation of NK cell functions.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
AIM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Apr
pubmed:issn
0022-1767
pubmed:author
pubmed:issnType
Print
pubmed:day
1
pubmed:volume
154
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
3128-37
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed:year
1995
pubmed:articleTitle
Stimulation of protein tyrosine phosphorylation by interaction of NK cells with fibronectin via alpha 4 beta 1 and alpha 5 beta 1.
pubmed:affiliation
Department of Experimental Medicine, University of Rome La Sapienza, Italy.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't