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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)
 
 
 

Interferon type I downregulates human parainfluenza virus type 3-induced major histocompatibility complex class II expression.

Human parainfluenza virus type 3 (HPIV3) induces major histocompatibility complex (MHC) class II expression in a signal transducer and activator of transcription-1 (STAT1)- and class II transactivator (CIITA)-independent manner. Interferon (IFN)-gamma, the potent inducer of MHC class II, on the other hand, requires both STAT1 and CIITA in the induction process. IFN-alpha/beta has been shown to inhibit the IFN-y- induced expression of MHC class II by targeting a step(s) downstream of CIITA. Here we report that IFN-alpha/beta also inhibits the CIITA-independent expression of HPIV3-induced MHC class II. The inhibitory role of IFN-alpha/beta on HPIV3- induced MHC class II was confirmed by using anti-IFN-alpha/beta antibody and mutant cell lines defective in the IFN signaling components STAT1 and STAT2. IFN-alpha/beta inhibits virus- induced MHC class II expression just as it does IFN-gamma-induced MHC class II. The inhibition by IFN-alpha/beta of MHC class II expression may play a regulatory role in virus induced autoimmune disease mediated by MHC class II aberrant expression.[1]

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