Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
2
pubmed:dateCreated
2006-2-27
pubmed:abstractText
Synthetic peptides with sequences present in extracellular matrix protein fibronectin have been described to stimulate human monocytes. We describe now that one of these peptides, FN6, induces apoptotic effects on monocytes and we investigate the molecular mechanisms involved in the regulation of this response. Incubation of monocytes with FN6 induces the activation of the small GTPase Rac. In turn, Rac mediates the increase of both JNK and p38 activities in a sustained fashion, as well as the phosphorylation levels of their respective substrates c-Jun and ATF-2. FN6 also stimulates caspases -9 and -3 and the delayed proteolysis of its substrates PARP and D4-GDI. In addition, initiator caspases-1 and -5 were activated by FN6 treatment of monocytes but, in contrast to that observed for caspases-9 and -3, this effect was not dependent on JNK or p38 activities. These kinases also mediated the increase of Bax levels, but only in some conditions Bcl-2 depletion caused by the peptide. Moreover, whereas initially only caspase-1 is involved in caspase-3 activation, later on caspase-9 seems also to participate. Therefore, we demonstrate that FN6 stimulation allows multiple, JNK and p38-dependent and -independent interacting signals to regulate the apoptotic response in human monocytes.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Feb
pubmed:issn
1360-8185
pubmed:author
pubmed:issnType
Print
pubmed:volume
11
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
209-19
pubmed:dateRevised
2009-11-19
pubmed:meshHeading
pubmed-meshheading:16502259-Apoptosis, pubmed-meshheading:16502259-Apoptosis Regulatory Proteins, pubmed-meshheading:16502259-Basic-Leucine Zipper Transcription Factors, pubmed-meshheading:16502259-Cells, Cultured, pubmed-meshheading:16502259-DNA Fragmentation, pubmed-meshheading:16502259-Enzyme Activation, pubmed-meshheading:16502259-Fibronectins, pubmed-meshheading:16502259-Guanine Nucleotide Dissociation Inhibitors, pubmed-meshheading:16502259-Humans, pubmed-meshheading:16502259-Mitogen-Activated Protein Kinases, pubmed-meshheading:16502259-Monocytes, pubmed-meshheading:16502259-Peptides, pubmed-meshheading:16502259-Phosphorylation, pubmed-meshheading:16502259-Poly(ADP-ribose) Polymerases, pubmed-meshheading:16502259-Tumor Suppressor Proteins, pubmed-meshheading:16502259-rac GTP-Binding Proteins
pubmed:year
2006
pubmed:articleTitle
Regulation of apoptosis by peptides of fibronectin in human monocytes.
pubmed:affiliation
Departamento de Bioquímica, Universidad de Navarra, C/Irunlarrea 1, 31008, Pamplona, Navarra, Spain.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't