Abstract:
:Thymocyte-expressed, positive selection-associated 1 (Tespa1) is important in T cell receptor (TCR)-driven thymocyte development. Downstream of the TCR, Tespa1 is a crucial component of the linker for activation of T cells (LAT) signalosome, facilitating calcium signalling and subsequent MAPK activation. However, it is unknown how Tespa1 elicits calcium signalling. Here, we show that inositol 1,4,5-trisphosphate receptor type 1 (IP3R1) is crucial for Tespa1-optimized, TCR-induced Ca2+ flux and thymocyte development. Upon TCR stimulation, Tespa1 directly interacts with IP3R1 and recruits it to the TCR complex, where IP3R1 is phosphorylated at Y353 by Fyn. This Tespa1-IP3R1 interaction is mediated by the F187 and F188 residues of Tespa1 and the amino-terminus of IP3R1. Tespa1-F187A/F188A mutant mice phenocopy Tespa1-deficient mice with impaired late thymocyte development due to reduced IP3R1 translocation to the TCR-proximal region. Our work elucidates the function of Tespa1 in T cell development and the regulation of TCR-induced Ca2+ signalling through IP3R1.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Liang J,Lyu J,Zhao M,Li D,Zheng M,Fang Y,Zhao F,Lou J,Guo C,Wang L,Wang D,Liu W,Lu Ldoi
10.1038/ncomms15732subject
Has Abstractpub_date
2017-06-09 00:00:00pages
15732issn
2041-1723pii
ncomms15732journal_volume
8pub_type
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