Impaired Immune Responses and Prolonged Allograft Survival in Sly1 Mutant Mice
Open Access
- 1 November 2005
- journal article
- research article
- Published by Taylor & Francis Ltd in Molecular and Cellular Biology
- Vol. 25 (21), 9646-9660
- https://doi.org/10.1128/mcb.25.21.9646-9660.2005
Abstract
Adaptive immunity is crucial for protective host defense and the development of immunological disorders. SLY1 was recently identified as an X-chromosomal SH3 protein that is serine phosphorylated (Ser27) upon B-and T-cell receptor engagement. Here, we demonstrate that SLY1 is localized in the cytoplasm and the nucleus of immunocytes. We generated mice expressing a mutant version of SLY1 lacking Ser27 and a functional nuclear localization signal. The defective SLY1 (SLY1d) protein is localized exclusively in the cytoplasm. B- and T-cell proliferation is attenuated and T-cell cytokine production is severely reduced. Sly1d/d mice exhibit reduced lymphoid organ sizes, diminished marginal zone B-cell numbers, and severely impaired antibody responses against T-dependent and -independent antigens. Importantly, survival of semi-identical cardiac allografts was substantially prolonged in Sly1d/d mice. These results define SLY1 as an essential molecular component for the full activation of adaptive immunity.Keywords
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