| First Author | Park WR | Year | 2001 |
| Journal | Eur J Immunol | Volume | 31 |
| Issue | 5 | Pages | 1456-64 |
| PubMed ID | 11465102 | Mgi Jnum | J:69512 |
| Mgi Id | MGI:1934751 | Doi | 10.1002/1521-4141(200105)31:5<1456::AID-IMMU1456>3.0.CO;2-A |
| Citation | Park WR, et al. (2001) CD28 costimulation is required not only to induce IL-12 receptor but also to render janus kinases/STAT4 responsive to IL-12 stimulation in TCR-triggered T cells. Eur J Immunol 31(5):1456-64 |
| abstractText | The activation of resting T cells for the acquisition of various functions depends on whether CD28 costimulatory signals are provided upon T cell receptor stimulation. Here, we investigated how CD28 costimulation functions to allow TCR-triggered resting T cells to acquire IL-12 responsiveness. When T cells are stimulated with low doses of anti-CD3 mAb, CD28 costimulation was required for the optimal levels of IL-12 receptor (IL-12R) expression. However, stimulation of T cells with high doses of anti-CD3 alone induced comparable levels of IL-12R expression to those induced upon CD28 costimulation. Nevertheless, there was a substantial difference in IL-12 responsiveness between these two groups of T cells: compared to anti-CD28-costimulated T cells, T cells that were not costimulated with anti-CD28 exhibited decreased levels of Janus kinases (JAK) JAK2/TYK2 and STAT4 phosphorylation and IFN-y production following IL-12 stimulation. Importantly, STAT6 phosphorylation following IL-4 stimulation was not decreased in anti-CD28-uncostimulated T cells. These resutls indicate that CD28 costimulation not only contributes to up-regulating IL-12R expression but is also required to render JAKs/STAT4 responsive to IL-12 stimulation. |
