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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 
 
 

Mechanisms of H4/ICOS costimulation: effects on proximal TCR signals and MAP kinase pathways.

H4/ICOS is a costimulatory molecule related to CD28. Its effects on early TCR signals have been analyzed in mouse CD4(+) Th2 cells, expressing H4/ICOS at higher levels than Th1 clones. Anti-H4/ICOS antibodies strongly enhanced CD3- mediated tyrosine phosphorylation of ZAP-70, zeta, or Vav, as well as extracellular signal-regulated kinase ( ERK), Jun N-terminal kinase (JNK) and p38 MAP kinase activation in these cells. The association of phosphoinositide 3-kinase ( PI-3K) to H4/ICOS was enhanced by H4/ICOS cross-linking, and PI-3K inhibitors inhibited ERK and JNK activation and IL-4/IL-10 secretion, but not p38 MAP kinase or ZAP-70 activation. H4/ICOS- mediated activation of JNK, but not ERK or p38, is partially dependent on the expression of CD4 by the cells, whereas H4/ICOS costimulation is partially independent on CD28 expression. Cytochalasin D, an inhibitor of actin polymerization, inhibited ZAP-70, MAP kinase activation, or IL-4/IL-10 secretion. Neither cyclosporin A nor inhibitors of PKC produced detectable inhibition of ZAP-70 phosphorylation or MAP kinase activation in these Th2 cells. Cyclosporin A strongly inhibited IL-4, but not IL-10 secretion. ERK or JNKinhibitors partially inhibited IL-4 and IL-10 secretion, while PKC or p38 inhibitors had no significant effects on IL-4 or IL-10 secretion. Taken together, our data show clear similarities of costimulation mechanisms between H4/ICOS and CD28 during the early steps of TCR activation.[1]

References

  1. Mechanisms of H4/ICOS costimulation: effects on proximal TCR signals and MAP kinase pathways. Feito, M.J., Vaschetto, R., Criado, G., Sánchez, A., Chiocchetti, A., Jiménez-Periáñez, A., Dianzani, U., Portoles, P., Rojo, J.M. Eur. J. Immunol. (2003) [Pubmed]
 
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