FIP200 controls Bak expression via maintaining microRNA1198-5p expression. FIP200 controls Bak expression via maintaining microRNA1198-5p expression. (A)

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FIP200 controls Bak expression via maintaining microRNA1198-5p expression. FIP200 controls Bak expression via maintaining microRNA1198-5p expression. (A) Bcl-2 protein was detected in T cell subsets in WT and Fip200−/− mice (n = 3). (B) Bak and Bim proteins were detected in T cell subsets in WT and Fip200−/− mice (n = 3). (C) T cell apoptosis in WT, Fip200−/−, Bcl-2 transgenic (Bcl-2–WT) and Fip200−/−Bcl-2 transgenic mice (Bcl-2–KO; n = 3 to 5, means ± SEM). *P < 0.05 between KO and Bcl-2–KO (Mann-Whitney U tests). (D) Absolute numbers of T cell subsets in Fip200−/− and Bcl-2–KO spleen (n = 7, means ± SEM). *P < 0.05 (Mann-Whitney U tests). (E) Heat map of microRNAs in Fip200−/− naïve CD4+ T cells. MicroRNA arrays of naïve CD4+ T cells in WT and Fip200−/− mice. A fold change of >0.25 is shown. The red color represents high levels of microRNA expression in WT naïve CD4+ T cells as compared with Fip200−/− naïve CD4+ T cells. (F) Expression of three microRNAs in Fip200−/− naïve CD4+ T cells (n = 4, means ± SEM). *P < 0.05 (Mann-Whitney U tests). (G) Effect of microRNA1198-5p mimics on WT 3′UTR-Bak1 luciferase activity. The luciferase activity was measured in 293FT cells transfected with WT or mutant 3′UTR sequence of Bak1 (n = 3 in triplicate, means ± SEM). *P < 0.05 between WT and mutant (Student’s t tests). (H) Effects of microRNA1198-5p inhibitors and mimics on proapoptotic gene expression. WT and Fip200−/− T cells from lymph nodes were transfected with microRNA1198-5p inhibitors or mimics for 48 hours. Proapoptotic proteins were detected by Western blotting (n = 3). Houjun Xia et al. Sci. Immunol. 2017;2:eaan4631 Copyright © 2017 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works