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Deprecated: Implicit conversion from float 251.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 J+Immunol 2016 ; 196 (6): 2753-66 Nephropedia Template TP
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Inducible Major Vault Protein Plays a Pivotal Role in Double-Stranded RNA- or Virus-Induced Proinflammatory Response #MMPMID26843330
Peng N; Liu S; Xia Z; Ren S; Feng J; Jing M; Gao X; Wiemer EA; Zhu Y
J Immunol 2016[Mar]; 196 (6): 2753-66 PMID26843330show ga
Pathogen invasion triggers robust antiviral cytokine production via different transcription factor signaling pathways. We have previously demonstrated that major vault protein (MVP) induces type I IFN production during viral infection; however, little is known about the role of MVP in proinflammatory responses. In this study, we found in vitro that expression of MVP, IL-6, and IL-8 was inducible upon dsRNA stimulation or viral infection. Moreover, MVP was essential for the induction of IL-6 and IL-8, as impaired expression of IL-6 and IL-8 in MVP-deficient human PBMCs, human lung epithelial cells (A549), and THP-1 monocytes, as well as in murine splenocytes, peritoneal macrophages, and PBMCs from MVP-knockout (MVP(-/-)) mice, was observed. Upon investigation of the underlying mechanisms, we demonstrated that MVP acted in synergy with AP-1 (c-Fos) and CCAAT/enhancer binding protein (C/EBP)beta-liver-enriched transcriptional activating protein to activate the IL6 and IL8 promoters. Introduction of mutations into the AP-1 and C/EBPbeta binding sites on the IL6 and IL8 promoters resulted in the loss of synergistic activation with MVP. Furthermore, we found that MVP interacted with both c-Fos and C/EBPbeta. The interactions promoted nuclear translocation and recruitment of these transcription factors to IL6 and IL8 promoter regions. In the MVP(-/-) mouse model, significantly decreased expression of early antiviral cytokines resulted in higher viral titer in the lung, higher mortality, and heavier lung damage after infection with lethal influenza A virus. Taken together, our findings help to delineate a novel role of MVP in host proinflammatory response.