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Deprecated: Implicit conversion from float 211.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Transplant 2016 ; 16 (5): 1383-93 Nephropedia Template TP
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Glutamate receptor interacting protein 1 regulates CD4+ CTLA-4 expression and transplant rejection #MMPMID26601915
Modjeski K; Levy S; Ture S; Field D; Shi G; Ko K; Zhu Q; Morrell C
Am J Transplant 2016[May]; 16 (5): 1383-93 PMID26601915show ga
PDZ domains are common 80?90 amino acid regions named after the first three proteins discovered to share these domains: post-synaptic density 95, disc large, and zonula occludens. PDZ domain-containing proteins typically interact with the C-terminus of membrane receptors. Glutamate receptor interacting protein 1 (GRIP1), a 7 PDZ domain protein scaffold regulates glutamate receptor surface expression and trafficking in neurons. We have found that human and mouse T cells also express GRIP1. T cell-specific GRIP1?/? mice greater than 11 weeks of age had prolonged cardiac allograft survival. Compared to WT T cells, in vitro stimulated GRIP1?/? T cells had decreased expression of activation markers, and increased apoptotic surface marker expression. Surface expression of the strong T cell inhibitory molecule CTLA-4 was increased on GRIP1?/? T cells from mice greater than 11 weeks of age. CTLA-4 increases with T cell stimulation and its surface expression on GRIP1?/? T cells remained high after stimulation was removed indicating a possible internalization defect in GRIP1 deficient T cells. CTLA-4 blocking antibody treatment following heart transplantation led to complete rejection in T cell GRIP1?/? mice indicating that increased CTLA-4 surface expression contributed to the extended graft survival. Our data indicates that GRIP1 regulates T cell activation by regulating CTLA-4 surface expression.