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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 J+Biol+Chem
2016 ; 291
(12
): 6158-68
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Editing of Cellular Self-RNAs by Adenosine Deaminase ADAR1 Suppresses Innate
Immune Stress Responses
#MMPMID26817845
George CX
; Ramaswami G
; Li JB
; Samuel CE
J Biol Chem
2016[Mar]; 291
(12
): 6158-68
PMID26817845
show ga
Adenosine deaminases acting on double-stranded RNA (ADARs) catalyze the
deamination of adenosine (A) to produce inosine (I) in double-stranded (ds) RNA
structures, a process known as A-to-I RNA editing. dsRNA is an important trigger
of innate immune responses, including interferon (IFN) production and action. We
examined the role of A-to-I RNA editing by two ADARs, ADAR1 and ADAR2, in the
sensing of self-RNA in the absence of pathogen infection, leading to activation
of IFN-induced, RNA-mediated responses in mouse embryo fibroblasts. IFN treatment
of Adar1(-/-) cells lacking both the p110 constitutive and p150 IFN-inducible
ADAR1 proteins induced formation of stress granules, whereas neither wild-type
(WT) nor Adar2(-/-) cells displayed a comparable stress granule response
following IFN treatment. Phosphorylation of protein synthesis initiation factor
eIF2? at serine 51 was increased in IFN-treated Adar1(-/-) cells but not in
either WT or Adar2(-/-) cells following IFN treatment. Analysis by deep
sequencing of mouse exonic loci containing A-to-I-editing sites revealed that the
majority of editing in mouse embryo fibroblasts was carried out by ADAR1. IFN
treatment increased editing in both WT and Adar2(-/-) cells but not in either
Adar1(-/-) or Adar1(-/-) (p150) cells or Stat1(-/-) or Stat2(-/-) cells.
Hyper-edited sites found in predicted duplex structures showed strand bias of
editing for some RNAs. These results implicate ADAR1 p150 as the major A-to-I
editor in mouse embryo fibroblasts, acting as a feedback suppressor of innate
immune responses otherwise triggered by self-RNAs possessing regions of
double-stranded character.