Linked Life Data

10722231

Source:http://linkedlifedata.com/resource/pubmed/id/10722231

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1
pubmed:dateCreated
2000-4-11
pubmed:abstractText
Lymphomagenesis is a multistep process progressively freeing transformed thymocytes from external regulatory signals, i.e. thymic developmental program controlling growth, differentiation or apoptosis. Here we report that cells of thymic lymphoma overexpressing Ras/Raf proteins, initially resistant to TCR-dependent apoptosis but sensitive to dexamethasone- and etoposide-induced cell death, became insensitive to dexamethasone after long-time culture. That transition correlated with a strong increase in the expression of the anti-apoptotic Bcl-2 protein. Interestingly, lymphoma cells were still sensitive to p53-mediated apoptosis induced by etoposide. It suggests that the anti-apoptotic activity of Bcl-2 is correlated with a resistance to glucocorticoid-induced apoptosis but not to p53-mediated apoptosis. The sequence of mutations in the process of lymphomagenesis seems to be composed of at least 3 main hits which equip the cells with independence from external mitogenic signals (activation of Ras/Raf), resistance to inducers of apoptosis (activation of Bcl-2) and generation of cellular heterogeneity (deletion of p53) important in tumor progression.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:issn
0004-069X
pubmed:author
pubmed:issnType
Print
pubmed:volume
48
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
43-6
pubmed:dateRevised
2006-11-15
pubmed:meshHeading
pubmed:year
2000
pubmed:articleTitle
Changes in glucocorticoid-induced apoptosis and in expression of Bcl-2 protein during long-term culture of thymic lymphoma.
pubmed:affiliation
Laboratory of Cellular Immunology, Institute of Immunology and Experimental Therapy, Polish Academy of Sciences, Wroclaw.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't