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Cook, Melissa E; Bradstreet, Tara R; Webber, Ashlee M; Kim, Jongshin; Santeford, Andrea; Harris, Kevin M; Murphy, Maegan K; Tran, Jennifer; Abdalla, Nada M; Schwarzkopf, Elizabeth A; Greco, Suellen C; Halabi, Carmen M; Apte, Rajendra S; Blackshear, Perry J; Edelson, Brian T
Science immunology, 10/2022, Letnik: 7, Številka: 76Journal Article
RNA binding proteins are important regulators of T cell activation, proliferation, and cytokine production. The zinc finger protein 36 (ZFP36) family genes ( , , and ) encode RNA binding proteins that promote the degradation of transcripts containing AU-rich elements. Numerous studies have demonstrated both individual and shared functions of the ZFP36 family in immune cells, but their collective function in T cells remains unclear. Here, we found a redundant and critical role for the ZFP36 proteins in regulating T cell quiescence. T cell-specific deletion of all three ZFP36 family members in mice resulted in early lethality, immune cell activation, and multiorgan pathology characterized by inflammation of the eyes, central nervous system, kidneys, and liver. Mice with T cell-specific deletion of any two genes were protected from this spontaneous syndrome. Triply deficient T cells overproduced proinflammatory cytokines, including IFN-γ, TNF, and GM-CSF, due to increased mRNA stability of these transcripts. Unexpectedly, T cell-specific deletion of both and rendered mice resistant to experimental autoimmune encephalomyelitits due to failed priming of antigen-specific CD4 T cells. ZFP36L1 and ZFP36L2 double-deficient CD4 T cells had poor proliferation during in vitro T helper cell polarization. Thus, the ZFP36 family redundantly regulates T cell quiescence at homeostasis, but ZFP36L1 and ZFP36L2 are specifically required for antigen-specific T cell clonal expansion.
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in: SICRIS
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