Nanog attenuates lipopolysaccharide-induced inflammatory responses by blocking nuclear factor-B transcriptional activity in BV-2 cells

Nanog, a unique homeobox transcription factor, maintains self-renewal and pluripotency of embryonic stem cells by binding to nuclear factor B proteins in order to inhibit their transcriptional and prodifferentiation activities. We previously reported that Nanog attenuated inflammatory responses in rat primary microglia cells stimulated by lipopolysaccharide. However, the effects of Nanog on another microglia cell type, BV-2 cells, are still unknown. In this study, we investigated whether Nanog attenuated inflammatory responses in lipopolysaccharide-stimulated BV-2 cells and found that Nanog significantly decreased the release of nitric oxide and the expression of inducible nitric oxide synthase at the mRNA and protein levels. The production of proinflammatory cytokines including tumor necrosis factor- and interleukin-1 was also significantly inhibited by Nanog. Further, we observed that the transcriptional activity of nuclear factor B was dramatically reduced by Nanog. These results suggest that Nanog may be a potential anti-inflammatory therapy for neurological diseases caused by persistent microglia activation.