Journal
IMMUNITY
Volume 17, Issue 3, Pages 303-315Publisher
CELL PRESS
DOI: 10.1016/S1074-7613(02)00396-5
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With T cell receptor stimulation, intracellular pools of CD45 and spectrin move to the surface. These processes are coupled. In both peripheral lymphocytes and Jurkat T cells, PI spectrin and ankyrin associate with CD45. In Jurkat T cells, PI spectrin peptides suppress surface recruitment of CD45 and CD3 and abrogate T cell activation. Other glycoproteins such as CD43 are not altered by the spectrin peptides. Spectrin's effects are mediated by ankyrin, which binds directly to the cytoplasmic domain of CD45 (K-d = 4.3 +/- 3.0 nM). These data reveal a novel and unexpected contribution of the spectrin-ankyrin skeleton to the control of T lymphocyte function.
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