PuSH - Publikationsserver des Helmholtz Zentrums München: Nrf2 induces interleukin-6 (IL-6) expression via an antioxidant response element within the IL-6 promoter.

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Wruck, C.J.* ; Streetz, K.* ; Pavic, G.* ; Götz, M.E.* ; Tohidnezhad, M.* ; Brandenburg, L.O.* ; Varoga, D.* ; Eickelberg, O. ; Herdegen, T.* ; Trautwein, C.* ; Cha, K.* ; Kan, Y.W.* ; Pufe, T.*

Nrf2 induces interleukin-6 (IL-6) expression via an antioxidant response element within the IL-6 promoter.

J. Biol. Chem. 286, 4493-4499 (2011)

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IL-6 gene expression is controlled by a promoter-region containing multiple regulatory elements such as NF-kB, NF-IL6, CRE, GRE and TRE. In this study, we demonstrated that TRE, found within the IL-6 promoter, is embedded in a functional antioxidant response element (ARE) matching an entire ARE consensus sequence. Further, point mutations of the ARE consensus sequence in the IL-6 promoter construct selectively eliminate ARE but not TRE activity. Nrf2 is a redox-sensitive transcription factor which provides cytoprotection against electrophilic and oxidative stress and is the most potent activator of ARE-dependent transcription. Using Nrf2 knockout mice we demonstrate that Nrf2 is a potent activator of IL-6 gene transcription in vivo. Moreover, we show evidence that Nrf2 is the transcription factor that activates IL6 expression in a cholestatic hepatitis mouse model. Our findings suggest a possible role of IL-6 in oxidative stress defence and also give indication about an important function for Nrf2 in the regulation of hematopoietic and inflammatory processes.

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