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Deprecated: Implicit conversion from float 265.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Host+Microbe 2016 ; 19 (4): 515-28 Nephropedia Template TP
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NLRX1 Sequesters STING to Negatively Regulate the Interferon Response, Thereby Facilitating the Replication of HIV-1 and DNA Viruses #MMPMID27078069
Guo H; König R; Deng M; Riess M; Mo J; Zhang L; Petrucelli A; Yoh SM; Barefoot B; Samo M; Sempowski GD; Zhang A; Colberg-Poley AM; Feng H; Lemon SM; Liu Y; Zhang Y; Wen H; Zhang Z; Damania B; Tsao LC; Wang Q; Su L; Duncan JA; Chanda SK; Ting JPY
Cell Host Microbe 2016[Apr]; 19 (4): 515-28 PMID27078069show ga
Understanding the negative regulators of anti-viral immune responses will be critical for advancing immune-modulated antiviral strategies. NLRX1, an NLR protein that negatively regulates innate immunity, was previously identified in an unbiased siRNA screen as required for HIV infection. We find that NLRX1 depletion results in impaired nuclear import of HIV-1 DNA in human monocytic cells. Additionally, NLRX1 was observed to reduce type-I interferon (IFN-I) and cytokines in response to HIV-1 reverse-transcribed DNA. NLRX1 sequesters the DNA sensing adaptor STING from interaction with TANK-binding kinase 1 (TBK1), which is a requisite for IFN-1 induction in response to DNA. NLRX1-deficient cells generate an amplified STING-dependent host response to cytosolic DNA, c-di-GMP, cGAMP, HIV-1 and DNA viruses. Accordingly, Nlrx1?/? mice infected with DNA viruses exhibit enhanced innate immunity and reduced viral load. Thus, NLRX1 is a negative regulator of the host innate immune response to HIV-1 and DNA viruses.