Dual Role of CD4 in Peripheral T Lymphocytes

0579074 - ÚMG 2024 RIV CH eng J - Článek v odborném periodiku
Glatzová, Daniela - Cebecauer, M.
Dual Role of CD4 in Peripheral T Lymphocytes.
Frontiers in Immunology. Roč. 10, APR (2019), č. článku 618. ISSN 1664-3224. E-ISSN 1664-3224
Grant CEP: GA ČR(CZ) GA19-07043S
Institucionální podpora: RVO:68378050
Klíčová slova: cell-receptor microclusters * class-ii molecules * peptide-mhc * tyrosine kinase * antigen receptor * immunological synapse * tcr microclusters * crystal-structure * dendritic cells * activation * T lymphocytes * cd4 * TCR coreceptor * Lck * cell-cell adhesion * microvilli
Obor OECD: Biochemistry and molecular biology
Impakt faktor: 5.085, rok: 2019
Způsob publikování: Open access
https://www.frontiersin.org/articles/10.3389/fimmu.2019.00618/full

The interaction of T-cell receptors (TCRs) with self- and non-self-peptides in the major histocompatibility complex (MHC) stimulates crucial signaling events, which in turn can activate T lymphocytes. A variety of accessory molecules further modulate T-cell signaling. Of these, the CD4 and CD8 coreceptors make the most critical contributions to T cell sensitivity in vivo. Whereas, CD4 function in T cell development is well-characterized, its role in peripheral T cells remains incompletely understood. It was originally suggested that CD4 stabilizes weak interactions between TCRs and peptides in the MHC and delivers Lck kinases to that complex. The results of numerous experiments support the latter role, indicating that the CD4-Lck complex accelerates TCR-triggered signaling and controls the availability of the kinase for TCR in the absence of the ligand. On the other hand, extremely low affinity of CD4 for MHC rules out its ability to stabilize the receptor-ligand complex. In this review, we summarize the current knowledge on CD4 in T cells, with a special emphasis on the spatio-temporal organization of early signaling events and the relevance for CD4 function. We further highlight the capacity of CD4 to interact with the MHC in the absence of TCR. It drives the adhesion of T cells to the cells that express the MHC. This process is facilitated by the CD4 accumulation in the tips of microvilli on the surface of unstimulated T cells. Based on these observations, we suggest an alternative model of CD4 role in T-cell activation.
Trvalý link: https://hdl.handle.net/11104/0347948