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Tumor necrosis factor α (TNF-α), a pro-inflammatory cytokine, regulates inflammatory and immune responses by up-regulating gene expression in a manner that is dependent on the transcription factor nuclear factor κB (NF-κB). In the present study, we found that 4-hydroxypanduratin A and isopanduratin A, constituents of the rhizomes of Boesenbergia pandurata, inhibited the TNF-α-stimulated up-regulation of intercellular adhesion molecule-1 (ICAM-1) in human lung adenocarcinoma A549 cells. 4-Hydroxypanduratin A and isopanduratin A also reduced ICAM-1 mRNA expression and NF-κB-responsive luciferase activity in TNF-α-stimulated A549 cells. Moreover, 4-hydroxypanduratin A and isopanduratin A prevented the TNF-α-stimulated translocation of the NF-κB subunit p65 to the nucleus and the phosphorylation and proteasomal degradation of the inhibitor of the NF-κB α protein. The present results revealed that 4-hydroxypanduratin A and isopanduratin A inhibit TNF-α-stimulated gene expression and the NF-κB-dependent signaling pathway in A549 cells.

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4-Hydroxypanduratin A and Isopanduratin A Inhibit Tumor Necrosis Factor α-Stimulated Gene Expression and the Nuclear Factor κB-Dependent Signaling Pathway in Human Lung Adenocarcinoma A549 Cells