Linked Life Data

1633108

Source:http://linkedlifedata.com/resource/pubmed/id/1633108

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
3
pubmed:dateCreated
1992-8-21
pubmed:abstractText
Cross-linking of B-cell membrane immunoglobulin (Ig) receptors induces growth arrest at G1-S, leading to apoptosis and cell death in the immature lymphomas WEHI-231 and CH31, but not in the CH12 B-cell line. In this system, which has been used as a model for B-cell tolerance, we have established that these lymphomas produce active transforming growth factor beta (TGF-beta) when treated with anti-Ig and that their hierarchy of sensitivity to TGF-beta generally correlates with their growth inhibition by anti-Ig. TGF-beta, in turn, has been shown to interfere with the phosphorylation of the retinoblastoma gene product, pRB. Herein, we also demonstrate that in WEHI-231 B-lymphoma cells treated with anti-Ig for 24 h, the pRB protein is found to be predominantly in the underphosphorylated form, as previously reported for cells arrested by the exogenous addition of TGF-beta. However, neutralizing antibodies to TGF-beta failed to prevent growth inhibition by anti-Ig in WEHI-231 and CH31. When WEHI-231 lymphoma cells were selected for growth in TGF-beta, the majority of the TGF-beta-resistant clones remained sensitive to anti-Ig-mediated growth inhibition. In these clones, the retinoblastoma gene product was found to be in the underphosphorylated form after 24-h treatment with anti-Ig, but not with TGF-beta. These data show that anti-Ig treatment of murine B-cell lymphomas stimulates the production of active TGF-beta but that a TGF-beta-independent pathway may be responsible for the pRB underphosphorylation and cell cycle blockade.
pubmed:grant
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
1044-9523
pubmed:author
pubmed:issnType
Print
pubmed:volume
3
pubmed:geneSymbol
pRB
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
175-81
pubmed:dateRevised
2007-11-14
pubmed:meshHeading
pubmed:year
1992
pubmed:articleTitle
Anti-immunoglobulin treatment of murine B-cell lymphomas induces active transforming growth factor beta but pRB hypophosphorylation is transforming growth factor beta independent.
pubmed:affiliation
Division of Immunology and Immunotherapy, University of Rochester Cancer Center, New York 14642.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, P.H.S., Research Support, Non-U.S. Gov't