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Deprecated: Implicit conversion from float 243.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Arthritis+Rheumatol 2017 ; 69 (5): 1035-44 Nephropedia Template TP
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SLAMF7 engagement restores defective effector CD8+ T cells activity in response to foreign antigens in systemic lupus erythematosus #MMPMID28076903
Comte D; Karampetsou MP; Yoshida N; Kis-Toth K; Kyttaris VC; Tsokos GC
Arthritis Rheumatol 2017[May]; 69 (5): 1035-44 PMID28076903show ga
Objective: Effector CD8+ T cell function is impaired in SLE and associated with compromised ability to fight infections. SLAMF7 engagement has been shown to enhance NK cell degranulation. Thus, we characterized the expression and function of SLAMF7 on CD8+ T cells subsets isolated from peripheral blood of SLE patients and healthy subjects. Methods: CD8+ T cell subset distribution, SLAMF7 expression and cytolytic enzyme expression (perforin, GzmA, GzmB) were monitored on cells isolated from SLE patients and healthy controls by flow cytometry. CD107a expression and IFN? production in response to viral antigenic stimulation were assessed by flow cytometry in the presence or absence of an anti-SLAMF7 antibody. The antiviral cytotoxic activity in response to SLAMF7 engagement was determined using a flow cytometry-based assay. Results: The distribution of CD8+ T cell subsets is altered in the peripheral blood of SLE patients with decreased effector cell subpopulation. Memory CD8+ T cells from SLE patients display decreased amounts of SLAMF7, a surface receptor that characterizes effector CD8+ T cells. Ligation of SLAMF7 increases CD8+ T cell degranulation capacity and the percentage of IFN?-producing cell in response to antigen challenge in SLE and healthy controls. Moreover, SLAMF7 engagement promotes cytotoxic lysis of target cells in response to viral antigenic stimulation. Conclusion: Activation of SLAMF7 through a specific mAb restores defective SLE effector CD8+ T cells function in response to viral antigens and represents a potential therapeutic option in SLE.