Abstract
Lipoxins (LXs), including lipoxin A4 (LXA4), etc., have been approved for potent anti-inflammatory and immunomodulatory properties. Based on the important roles of macrophages in inflammation and immunomodulation, we investigate the effects of LXA4 on lipopolysaccharide (LPS)-induced proliferation and the possible signal transduction pathways in RAW264.7 macrophages. RAW264.7 cells were treated in vitro with or without LPS in the absence or presence of LXA4. [3H]-TdR incorporation assay and flow cytometry were used for detecting cell proliferation and cycle, respectively. Moreover, Western blot was applied to evaluate the protein expression levels of Cyclin E, IκBα, nuclear factor-κB (NF-κB), and IκB kinase (IKK). Our research showed that LXA4 suppressed LPS-induced proliferation, increased the proportion of the G0/G1 phase, decreased the proportion of the S phase, and downregulated the expression of Cyclin E. Besides these, LXA4 suppressed LPS-induced IκBα degradation, NF-κB translocation, and the expression of IKK. The data suggested that LXA4 inhibited LPS-induced proliferation through the G0/G1 phase arrest in RAW264.7 macrophages, and the inhibitory effect might depend on NF-κB signaling transduction pathway.
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Acknowledgments
This work was supported by the grants from the National Natural Science Foundation of China (no. 81100299), Natural Science Foundation of Jiangxi Province (no. 20114BAB215010), Educational Foundation of Jiangxi Province (no. GJJ13038), and Doctoral Foundation of Nanchang University (no. 06301055).
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Huang, YH., Wang, HM., Cai, ZY. et al. Lipoxin A4 Inhibits NF-κB Activation and Cell Cycle Progression in RAW264.7 Cells. Inflammation 37, 1084–1090 (2014). https://doi.org/10.1007/s10753-014-9832-2
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DOI: https://doi.org/10.1007/s10753-014-9832-2