Influenza virus infection induces metallothionein gene expression in the mouse liver and lung by overlapping but distinct molecular mechanisms
Authors: S T Jacob
J Datta
S Majumder
M Shah
J F Sheridan
J Hunzeker
K Ghoshal
Q Zhu
Journal: Molecular and Cellular Biology (2001)
Discipline: MOLECULAR BIOLOGY & GENETICS
Keywords: Metallothionein I; Metallothionein II; ROS; heavy metals; environmental stressors
Affiliations: Department of Molecular and Cellular Biochemistry, College of Medicine, The Ohio State University, 333 Hamilton Hall, 1645 Neil Ave., Columbus, OH 43210, USA., <!--label omitted: 1-->Department of Molecular and Cellular Biochemistry, College of Medicine,1, <!--label omitted: 2-->Section of Oral Biology, College of Dentistry, 2  and, <!--label omitted: 3-->Department of Internal Medicine, College of Medicine, 3  The Ohio State University, Columbus, Ohio 43210

Abstract:  Metallothionein I (MT-I) and MT-II have been implicated in the protection of cells against reactive oxygen species (ROS), heavy metals, and a variety of pathological and environmental stressors. Here, we show a robust increase in MT-I/MT-II mRNA level and MT proteins in the livers and lungs of C57BL/6 mice exposed to the influenza A/PR8 virus that infects the upper respiratory tract and lungs. Interleukin-6 (IL-6) had a pronounced effect on the induction of these genes in the liver but not the lung. Treatment of the animals with RU-486, a glucocorticoid receptor antagonist, inhibited induction of MT-I/MT-II in both liver and lung, revealing a direct role of glucocorticoid that is increased upon infection in this induction process. In vivo genomic footprinting (IVGF) analysis demonstrated involvement of almost all metal response elements, major late transcription factor/antioxidant response element (MLTF/ARE), the STAT3 binding site on the MT-I upstream promoter, and the glucocorticoid responsive element (GRE1), located upstream of the MT-II gene, in the induction process in the liver and lung. In the lung, inducible footprinting was also identified at a unique gamma interferon (IFN-gamma) response element (gamma-IRE) and at Sp1 sites. The mobility shift analysis showed activation of STAT3 and the glucocorticoid receptor in the liver and lung nuclear extracts, which was consistent with the IVGF data. Analysis of the newly synthesized mRNA for cytokines in the infected lung by real-time PCR showed a robust increase in the levels of IL-10 and IFN-gamma mRNA that can activate STAT3 and STAT1, respectively. A STAT1-containing complex that binds to the gamma-IRE in vitro was activated in the infected lung. No major change in MLTF/ARE DNA binding activity in the liver and lung occurred after infection. These results have demonstrated that MT-I and MT-II can be induced robustly in the liver and lung following experimental influenza virus infection by overlapping but distinct molecular mechanisms. 

Retracted: No

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