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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

SS-A/Ro52, an autoantigen involved in CD28- mediated IL-2 production.

An autoantibody against SS-A/Ro52 (Ro52) is most frequently found in the sera of patients with Sjögren's syndrome, systemic lupus erythematosus, and congenital heart block from anti-Ro52 Ab-positive mother. However, the physiological function of the autoantigen SS-A/Ro52 has not yet been elucidated. In this study, we describe the role of Ro52 protein in T cell activation. Overexpression of SS-A/Ro52 in Jurkat T cell resulted in enhanced IL-2 production following CD28 stimulation. Furthermore, transfection of anti-Ro52-specific small RNA duplexes partially blocked the expression of native and overexpressed Ro52 in Jurkat T cell, resulting in decreased IL-2 production via CD28 pathway in these cells. Finally, intracellular localization of Ro52 dramatically changed following CD28 stimulation. Our data reveal a novel function of Ro52 in CD28-mediated pathway, which eventually contributes to cytokine production and expression of the T cell biological programs.[1]


  1. SS-A/Ro52, an autoantigen involved in CD28-mediated IL-2 production. Ishii, T., Ohnuma, K., Murakami, A., Takasawa, N., Yamochi, T., Iwata, S., Uchiyama, M., Dang, N.H., Tanaka, H., Morimoto, C. J. Immunol. (2003) [Pubmed]
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