Recombinant TAT-CD137 Ligand Cytoplasmic Domain Fusion Protein Induces the Production of IL-6 and TNF-alpha in Peritoneal Macrophages
Immune Network
;
: 216-222, 2011.
Article
Dans Anglais
| WPRIM
| ID: wpr-39106
ABSTRACT
BACKGROUND:
The ligand for CD137 (CD137L; also called 4-1BBL) is mainly expressed on activated APCs such as dendritic cells, B cells and macrophages. Even though CD137L functions as a trigger of the CD137 signaling pathway for T cell activation and expansion, engagement of CD137L can deliver a signal leading to the production of proinflammatory cytokines in macrophages.METHODS:
We generated cell-permeable TAT-CD137L cytoplasmic domain fusion protein (TAT-CD137Lct) and examined its ability to initiate the CD137L reverse signaling pathway.RESULTS:
Treatment of TAT-CD137Lct induced the production of high levels of IL-6 and TNF-alpha mRNAs and proteins in peritoneal macrophages. TAT-CD137Lct increased phosphorylation of Erk, p38 MAPK and Jnk, and activated transcription factors C/EBP and CREB. However, TAT-CD137Lct did not visibly affect the degradation of the inhibitor of NF-kB (IkBalpha). We further demonstrated that JNK activation was required for TAT-CD137Lct-induced production of TNF-alpha, while activation of Erk and p38 MAPK were involved in IL-6 and TNF-alpha production.CONCLUSION:
Our results suggest that TAT-CD137Lct is an effective activator for the CD137L reverse signaling pathway.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Phosphorylation
/
Facteurs de transcription
/
Cellules dendritiques
/
ARN messager
/
Lymphocytes B
/
Protéines
/
Cytokines
/
Facteur de transcription NF-kappa B
/
Interleukine-6
/
Facteur de nécrose tumorale alpha
langue:
Anglais
Texte intégral:
Immune Network
Année:
2011
Type:
Article
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