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Annexin-1 (ANX1) is an anti-inflammatory protein as well as an important modulator in inflammation. However, the precise action of ANX1 remains unclear. To elucidate the protective effects of ANX1 on lipopolysaccharide (LPS)-induced murine macrophage Raw 264.7 cells, we constructed a cell-permeable Tat-ANX1 protein. The transduced Tat-ANX1 protein markedly inhibited the expression of cyclooxygenase-2, production of prostaglandin E(2), and generation of pro-inflammatory cytokines in the cells. Furthermore, transduced Tat-ANX1 protein caused a significant reduction in the activation of nuclear factor- kappa B (NF-kB) and mitogen-activated protein kinase (MAPK). The results indicate that Tat-ANX1 inhibits the production of inflammatory response cytokines and enzymes by blocking NF-kB and MAPK. Therefore, Tat-ANX1 protein may be useful as a therapeutic agent against various inflammatory diseases.

Transduced Tat-Annexin protein suppresses inflammation-associated gene expression in lipopolysaccharide (LPS)-stimulated Raw 264.7 cells