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Schnurri-2 (Shn-2) is a large zinc-finger containing protein, and it plays a critical role in cell growth, signal transduction and lymphocyte development. In Shn-2-deficient CD4 T cells, the activation of NF-kappaB was up-regulated and their ability to differentiate into Th2 cells was enhanced. We herein demonstrate that Th1 and Th2 memory cells are not properly generated from Shn-2-deficient effector Th1/Th2 cells. Even a week after the transfer of effector Th1/Th2 cells into syngeneic mice, a dramatic decrease in the number of Shn-2-deficient donor T cells was detected particularly in the lymphoid organs. The transferred Shn-2-deficient Th1/Th2 cells express higher levels of the activation marker CD69. No significant defect in the BrdU incorporation in the Shn-2-deficient transferred CD4 T cells was observed. The numbers of apoptotic cells were selectively higher in Shn-2-deficient donor Th1/Th2 cell population. Moreover, Shn-2-deficient effector Th1 and Th2 cells showed an increased susceptibility to cell death in in vitro cultures with increased expression of FasL. Transfer of Th2 effector cells over-expressing the p65 subunit of NF-kappaB resulted in a decreased number of p65-expressing cells in the lymphoid organs. As expected, T cell-dependent Ab responses after in vivo immunization of Shn-2-deficient mice were significantly reduced. Thus, Shn-2 appears to control the generation of memory Th1/Th2 cells through a change in their susceptibility to cell death.

Schnurri-2 Controls Memory Th1 and Th2 Cell Numbers In Vivo