Linked Life Data

8392437

Source:http://linkedlifedata.com/resource/pubmed/id/8392437

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
1993-8-17
pubmed:abstractText
The effects mediated by a combined stimulation of cAMP- and protein kinase C (PKC)-dependent pathways have been investigated in different cellular systems, and it has been shown that they may complement each other in activating cell proliferation and differentiation. In this report, we show that upon the stimulation of both pathways T lymphocytes became refractory to activation via the CD3/T cell receptor (TcR) complex. T cells preincubated with phorbol 12-myristate 13-acetate (PMA) and dibutyryl cAMP (Bt2cAMP) displayed a deficient proliferative ability in response to anti-CD3 mAb stimulation, whereas lymphocytes treated individually with either Bt2cAMP or PMA responded comparably to untreated samples. We detected an association between the reduced mitogenic response and low expression of both interleukin-2 (IL-2) and the alpha chain (CD25) of the IL-2 receptor (IL-2R). Analysis of intracellular Ca2+ mobilization suggested that the CD3/TcR-dependent signal transduction was impaired in PMA/Bt2cAMP-treated cells. Remarkably, we observed that these samples displayed a persistent expression of the c-fos protooncogene, associated to an increased AP-1 DNA-binding activity, whereas no variations of CREB or NF-kB were detected. Neither Bt2cAMP nor PMA individually mediated these sustained effects, which therefore appear as a consequence of the interplay between both metabolic stimuli. Altogether, the data provide the evidence that both pathways complement each other in regulating gene expression and, conversely, downregulate the TcR transduction mechanisms.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jul
pubmed:issn
0008-8749
pubmed:author
pubmed:issnType
Print
pubmed:volume
149
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
343-56
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
1993
pubmed:articleTitle
Costimulation of cAMP and protein kinase C pathways inhibits the CD3-dependent T cell activation and leads to a persistent expression of the AP-1 transcription factor.
pubmed:affiliation
Sección de Inmunología, Hospital de la Princesa, Universidad Autónoma de Madrid, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't