Linked Life Data

9758693

Source:http://linkedlifedata.com/resource/pubmed/id/9758693

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
1998-12-14
pubmed:abstractText
The proliferative response of clonal B cells from patients with chronic lymphocytic leukemia (B-CLL) is drastically reduced compared to normal B lymphocytes stimulated via the B cell antigen receptor complex or by CD40 ligation. In the present study we demonstrate that hyporesponsiveness of CLL-B cells can be overcome by stimulatory pathways mediated by activated CD4(+) T cells. In contrast to CD40 ligation, costimulation with activated T cells promotes a proliferative response in CLL-B cells identical to that in normal B cells. Furthermore, coculture with activated T cells improved survival of CLL-B cells in vitro. Differentiation of CLL-B cells into IgM producing cells was promoted, as well. However, the capacity for IgM secretion remained impaired compared to that of normal B cells. For T-cell-mediated B cell activation direct cellular contact with activated T helper cells is absolutely required. Prevention of CD40/CD40L interaction by CD40 antibody caused only partial inhibition of B cell activation, suggesting that additional signals are involved in T-B cell interaction. Whereas interruption of the ligand pairs CD11a/CD54, CD5/CD72, CD27/CD70 had no influence, the addition of CD58 antibody completely inhibited B cell activation by activated T cells. In costimulation with cellular signals the presence of B-cell-tropic cytokines, such as IL-2 and IL-4, was required to optimize B-CLL proliferation, as demonstrated by the use of neutralizing antibodies. We conclude from these results that proliferative hyporesponsiveness by CLL-B cells can be circumvented by antigen-nonspecific signals in addition to CD40 which are mediated by direct contact with activated T helper cells.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Oct
pubmed:issn
0008-8749
pubmed:author
pubmed:copyrightInfo
Copyright 1998 Academic Press.
pubmed:issnType
Print
pubmed:day
10
pubmed:volume
189
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
41-50
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1998
pubmed:articleTitle
Direct cellular interaction with activated CD4(+) T cells overcomes hyporesponsiveness of B-cell chronic lymphocytic leukemia in vitro.
pubmed:affiliation
Third Department of Medicine, The Johannes Gutenberg University School of Medicine, Mainz, Germany.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't