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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+Exp+Med
2016 ; 213
(10
): 2065-80
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Epstein-Barr viral miRNAs inhibit antiviral CD4+ T cell responses targeting IL-12
and peptide processing
#MMPMID27621419
Tagawa T
; Albanese M
; Bouvet M
; Moosmann A
; Mautner J
; Heissmeyer V
; Zielinski C
; Lutter D
; Hoser J
; Hastreiter M
; Hayes M
; Sugden B
; Hammerschmidt W
J Exp Med
2016[Sep]; 213
(10
): 2065-80
PMID27621419
show ga
Epstein-Barr virus (EBV) is a tumor virus that establishes lifelong infection in
most of humanity, despite eliciting strong and stable virus-specific immune
responses. EBV encodes at least 44 miRNAs, most of them with unknown function.
Here, we show that multiple EBV miRNAs modulate immune recognition of recently
infected primary B cells, EBV's natural target cells. EBV miRNAs collectively and
specifically suppress release of proinflammatory cytokines such as IL-12, repress
differentiation of naive CD4(+) T cells to Th1 cells, interfere with peptide
processing and presentation on HLA class II, and thus reduce activation of
cytotoxic EBV-specific CD4(+) effector T cells and killing of infected B cells.
Our findings identify a previously unknown viral strategy of immune evasion. By
rapidly expressing multiple miRNAs, which are themselves nonimmunogenic, EBV
counteracts recognition by CD4(+) T cells and establishes a program of reduced
immunogenicity in recently infected B cells, allowing the virus to express viral
proteins required for establishment of life-long infection.