Abstract:
:Stimulator of interferon gene (STING), an important adapter responsible for RLR pathway, plays a pivotal role in both viral RNA- and DNA-triggered induction of IFNs in mammals. To understand the roles of STING in piscine immune system, STING gene (CiSTING) was identified from grass carp (Ctenopharyngodon idella). The genomic sequence of CiSTING was of 8548 base pairs (bp), including 899 bp 5' flank region, 7 exons and 6 introns. Promoter region was predicted and promoter activity was verified. The CiSTING cDNA was of 1358 bp with an open reading frame of 1185 bp, encoding a polypeptide of 394 amino acids with a signal peptide and three transmembrane motifs in the N-terminal region. mRNA expression of CiSTING was widespread in fifteen tissues investigated, and was up-regulated by GCRV in vivo and in vitro. Meanwhile, the transcription of CiSTING was inhibited at early stage, and then up-regulated at late phase upon poly(I:C) or PGN stimulation in vitro. Interestingly, CiSTING had little impact on LPS in vitro. In CiSTING over-expression cells, CiTBK1, CiIRF3 and CiIRF7 were significantly up-regulated post GCRV or viral/bacterial PAMPs stimulation. In addition, post GCRV or PGN stimulation, the transcription of CiIFN-I was remarkably inhibited while CiMx1 was up-regulated; as for poly(I:C) stimulation, mRNA expressions of CiIFN-I and CiMx1 were inhibited at early stage while enhanced at late phrase; after LPS stimulation, both CiIFN-I and CiMx1 were inhibited. Furthermore, antiviral activity of CiSTING was manifested by the inhibition of GCRV yield. Taken together, these results demonstrated that CiSTING may be involved in board innate immune responses via the TBK1-IRF3/IRF7 cascade, responding to not only dsRNA analogue in an IFN-dependent pathway, but also virus and bacterial PAMPs in an IFN-independent pathway. This study provided novel insights into the essential role of STING in innate immunity.
journal_name
Dev Comp Immunoljournal_title
Developmental and comparative immunologyauthors
Feng X,Yang C,Zhang Y,Peng L,Chen X,Rao Y,Gu T,Su Jdoi
10.1016/j.dci.2014.03.001subject
Has Abstractpub_date
2014-07-01 00:00:00pages
163-76issue
1eissn
0145-305Xissn
1879-0089pii
S0145-305X(14)00061-5journal_volume
45pub_type
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