Pretreatment of macrophages with paclitaxel inhibits iNOS expression

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Pretreatment of macrophages with paclitaxel inhibits iNOS expression
M H Li; Jong Soon Kang; Hwan Mook Kim; Y J Jeon
Bibliographic Citation
Journal of Toxicology and Pubic Health, vol. 22, no. 1, pp. 103-107
Publication Year
We demonstrate that paclitaxel, an antitumor agent derived from yew tree, inhibits LPS-induced expression of iNOS gene in RAW 264.7 cells. Previously, paclitaxel has been known to induce iNOS gene expression in macrophages. However, in this report we described that the pretreatment of macrophages with paclitaxel (0.1 μM) for 8 h inhibited LPS-induced iNOS gene expression. Pretreatment of RAW 264.7 cells with paclitaxel significantly inhibited LPS-stimulated nitric oxide (NO) production. Western immunoblot of iNOS and RT-PCR analysis showed that the decrease of NO was due to the inhibition of iNOS gene expression in RAW 264.7 cells. Immunocytochemical staining of iNOS further confirmed that pretreatment of macrophages with paclitaxel inhibited macrophage activation. Electrophoretic mobility shift assay showed that paclitaxel inhibited NF-κ/Rel DNA binding. Collectively, these series of experiments indicate that paclitaxel inhibits iNOS gene expression by blocking NF-κB/Rel activation.
Korea Soc-Assoc-Inst
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Ochang Branch Institute > Division of National Bio-Infrastructure > Laboratory Animal Resource & Research Center > 1. Journal Articles
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