| First Author | Liu D | Year | 2014 |
| Journal | J Exp Med | Volume | 211 |
| Issue | 2 | Pages | 297-311 |
| PubMed ID | 24493803 | Mgi Jnum | J:208437 |
| Mgi Id | MGI:5563298 | Doi | 10.1084/jem.20130902 |
| Citation | Liu D, et al. (2014) 2B4 (CD244) induced by selective CD28 blockade functionally regulates allograft-specific CD8+ T cell responses. J Exp Med 211(2):297-311 |
| abstractText | Mounting evidence in models of both autoimmunity and chronic viral infection suggests that the outcome of T cell activation is critically impacted by the constellation of co-stimulatory and co-inhibitory receptors expressed on the cell surface. Here, we identified a critical role for the co-inhibitory SLAM family member 2B4 (CD244) in attenuating primary antigen-specific CD8(+) T cell responses in the presence of immune modulation with selective CD28 blockade. Our results reveal a specific up-regulation of 2B4 on antigen-specific CD8(+) T cells in animals in which CD28 signaling was blocked. However, 2B4 up-regulation was not observed in animals treated with CTLA-4 Ig (abatacept) or CD28 blockade in the presence of anti-CTLA-4 mAb. 2B4 up-regulation after CD28 blockade was functionally significant, as the inhibitory impact of CD28 blockade was diminished when antigen-specific CD8(+) T cells were deficient in 2B4. In contrast, 2B4 deficiency had no effect on CD8(+) T cell responses during unmodified rejection or in the presence of CTLA-4 Ig. We conclude that blockade of CD28 signals in the presence of preserved CTLA-4 signals results in the unique up-regulation of 2B4 on primary CD8(+) effectors, and that this 2B4 expression plays a critical functional role in controlling antigen-specific CD8(+) T cell responses. |
