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2008: Lippmann Juliane; Rothenburg Stefan; Deigendesch Nikolaus; Eitel Julia; Meixenberger Karolin; van Laak Vincent; Slevogt Hortense; N'guessan Philippe Dje; Hippenstiel Stefan; Chakraborty Trinad; Flieger Antje; Suttorp Norbert; Opitz Bastian
IFNbeta responses induced by intracellular bacteria or cytosolic DNA in different human cells do not require ZBP1 (DLM-1/DAI).
Cellular microbiology 2008;10(12):2579-88.
Intracellular bacteria and cytosolic stimulation with DNA activate type I IFN responses independently of Toll-like receptors, most Nod-like receptors and RIG-like receptors. A recent study suggested that ZBP1 (DLM-1/DAI) represents the long anticipated pattern recognition receptor which mediates IFNalpha/beta responses to cytosolic DNA in mice. Here we show that Legionella pneumophila infection, and intracellular challenge with poly(dA-dT), but not with poly(dG-dC), induced expression of IFNbeta, full-length hZBP1 and a prominent splice variant lacking the first Zalpha domain (hZBP1DeltaZalpha) in human cells. Overexpression of hZBP1 but not hZBP1DeltaZalpha slightly amplified poly(dA-dT)-stimulated IFNbeta reporter activation in HEK293 cells, but had no effect on IFNbeta and IL-8 production induced by bacteria or poly(dA-dT) in A549 cells. We found that mZBP1 siRNA impaired poly(dA-dT)-induced IFNbeta responses in mouse L929 fibroblasts at a later time point, while multiple hZBP1 siRNAs did not suppress IFNbeta or IL-8 expression induced by poly(dA-dT) or bacterial infection in human cells. In contrast, IRF3 siRNA strongly impaired the IFNbeta responses to poly(dA-dT) or bacterial infection. In conclusion, intracellular bacteria and cytosolic poly(dA-dT) activate IFNbeta responses in different human cells without requiring human ZBP1.

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