Activation of nuclear factor-κB in C6 rat glioma cells after transfection with glia maturation factor

Abstract

The 17-kDa endogenous brain protein gila maturation factor (GMF) was transfected into C6 rat glioma cells using a replication-defective human adenovirus vector. The cells overexpressed GMF but did not secrete the protein into the medium. Transfection with GMF led to the activation of the transcription factor nuclear factor-κB (NF-κB), as evidenced by electrophoretic mobility shift assay of the nuclear extract, using a double- stranded oligonucleotide probe containing the consensus binding sequence for NF-κB. The specificity of binding was demonstrated by competition with unlabeled probe and by the nonbinding of the mutant probe. Binding was detectable as early as 3 h after transfection, peaked at 6 and 12 h, and gradually declined thereafter. The observed NF-κB activation was reduced by cotransfection with catalase and by the presence of high concentrations of pyruvate in the medium, suggesting the involvement of H2O2. The p38 mitogen-activated protein kinase inhibitor SB-203580 also suppressed the GMF- activated NF-κB, suggesting the involvement of the p38 signal transduction cascade. On the other hand, the phorbol ester phorbol 12-myristate 13-acetate activated NF-κB whether or not GMF was overexpressed. Along with NF-κB activation was an enhanced expression of superoxide dismutase (SOD), which was suppressed if NF-κB nuclear translocation was blocked by its specific decoy DNA, implicating NF-κB as an upstream mediator of this antioxidant enzyme. The p38 inhibitor SB-203580 also blocked the GMF-activated SOD. As NF-κB and SOD are both pro-survival signals, the results suggest a cytoprotective role for endogenous GMF in glial cells.