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Enhancement of CD8 T‐cell function through modifying surface glycoproteins in young and old mice
Author(s) -
Sadighi Akha Amir A.,
Berger Scott B.,
Miller Richard A.
Publication year - 2006
Publication title -
immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.297
H-Index - 133
eISSN - 1365-2567
pISSN - 0019-2805
DOI - 10.1111/j.1365-2567.2006.02420.x
Subject(s) - cd8 , granzyme b , cytotoxic t cell , t cell , cytolysis , granzyme a , biology , il 2 receptor , chemistry , microbiology and biotechnology , immunology , in vitro , biochemistry , immune system
Summary Previous work from our laboratory has shown that modifying cell surface glycosylation with either a Clostridium perfringens ‐derived sialidase (CP‐Siase), or an O‐linked glycoprotein endopeptidase (OSGE) can enhance the function of CD4 T cells from both young and old mice at multiple levels. Here we have re‐assessed the effect of age on CD8 T‐cell function, and examined the outcome of enzymatic treatment with CP‐Siase and OSGE on its different aspects. Pre‐treatment of CD8 T cells with either CP‐Siase or OSGE led to a significant increase in anti‐CD3‐mediated Ca 2+ response in both young and old mice. Pre‐treated CD8 T cells from both age groups also displayed a significant increase in activation‐induced CD69 and CD25 expression, and produced significantly higher amounts of interleukin‐2 and interferon‐γ in comparison to their untreated counterparts. Furthermore, pretreatment with either enzyme enhanced granzyme B expression in CD8 T cells, and increased their cytolytic activity in vitro . These data support the notion that glycosylated surface proteins hinder CD8 T‐cell activation and function in both young and old mice, and raise the possibility of significantly improving CD8 T cell function in older individuals through enzymatic alteration of surface glycoproteins.