| First Author | Kamimura D | Year | 2016 |
| Journal | Int Immunol | Volume | 28 |
| Issue | 3 | Pages | 117-26 |
| PubMed ID | 26489882 | Mgi Jnum | J:233909 |
| Mgi Id | MGI:5788366 | Doi | 10.1093/intimm/dxv059 |
| Citation | Kamimura D, et al. (2016) Strong TCR-mediated signals suppress integrated stress responses induced by KDELR1 deficiency in naive T cells. Int Immunol 28(3):117-26 |
| abstractText | KDEL receptor 1 (KDELR1) regulates integrated stress responses (ISR) to promote naive T-cell survival in vivo. In a mouse line having nonfunctional KDELR1, T-Red (naive T-cell reduced) mice, polyclonal naive T cells show excessive ISR and eventually undergo apoptosis. However, breeding T-Red mice with TCR-transgenic mice bearing relatively high TCR affinity rescued the T-Red phenotype, implying a link between ISR-induced apoptosis and TCR-mediated signaling. Here, we showed that strong TCR stimulation reduces ISR in naive T cells. In mice lacking functional KDELR1, surviving naive T cells expressed significantly higher levels of CD5, a surrogate marker of TCR self-reactivity. In addition, higher TCR affinity/avidity was confirmed using a tetramer dissociation assay on the surviving naive T cells, suggesting that among the naive T-cell repertoire, those that receive relatively stronger TCR-mediated signals via self-antigens survive enhanced ISR. Consistent with this observation, weak TCR stimulation with altered peptide ligands decreased the survival and proliferation of naive T cells, whereas stimulation with ligands having higher affinity had no such effect. These results suggest a novel role of TCR-mediated signals in the attenuation of ISR in vivo. |
