Research Papers: Immunology:
Unexpected positive control of NFκB and miR-155 by DGKα and ζ ensures effector and memory CD8+ T cell differentiation
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Jialong Yang1, Ping Zhang1, Sruti Krishna1, Jinli Wang2, Xingguang Lin2, Hongxiang Huang1,3, Danli Xie1,2, Balachandra Gorentla1, Rick Huang1, Jimin Gao2, Qi-Jing Li4, and Xiao-Ping Zhong1,4
1 Department of Pediatrics, Division of Allergy and Immunology, Duke University Medical Center, Durham, NC, USA
2 School of Laboratory Medicine, Wenzhou Medical University, Wenzhou, Zhejiang, China
3 Department of Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
4 Department of Immunology, Duke University Medical Center, Durham, NC, USA
Xiao-Ping Zhong, email:
Keywords: DGK, miR-155, NFκB, CD8 T cell, Listeria monocytogenes, Immunology and Microbiology Section, Immune response, Immunity
Received: January 11, 2016 Accepted: March 04, 2016 Published: March 17, 2016
Signals from the T-cell receptor (TCR) and γ-chain cytokine receptors play crucial roles in initiating activation and effector/memory differentiation of CD8 T-cells. We report here that simultaneous deletion of both diacylglycerol kinase (DGK) α and ζ (DKO) severely impaired expansion of CD8 effector T cells and formation of memory CD8 T-cells after Listeria monocytogenes infection. Moreover, ablation of both DGKα and ζ in preformed memory CD8 T-cells triggered death and impaired homeostatic proliferation of these cells. DKO CD8 T-cells were impaired in priming due to decreased expression of chemokine receptors and migration to the draining lymph nodes. Moreover, DKO CD8 T-cells were unexpectedly defective in NFκB-mediated miR-155 transcript, leading to excessive SOCS1 expression and impaired γ-chain cytokine signaling. Our data identified a DGK-NFκB-miR-155-SOCS1 axis that bridges TCR and γ-chain cytokine signaling for robust CD8 T-cell primary and memory responses to bacterial infection.
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