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ER Stress, P66shc, and P-Akt/Akt Mediate Adjuvant-Induced Inflammation, Which Is Blunted by Argirein, a Supermolecule and Rhein in Rats

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Abstract

We investigated the anti-inflammatory activities of argirein and rhein on inflammatory edema in rat paw which was caused by complete adjuvant, compared with ibuprofen. We hypothesized that the adjuvant-induced inflammation is attributed to upregulation of activating transcript factor 6 (ATF6; a chaperone for endoplasmic reticulum (ER) stress), p66Shc (an adaptive protein modulating oxidative stress), and NADPH oxidase subunits p22phox and gp91phox in the inflamed tissues. Biomarkers were measured in the rat paw in association with monitoring swellings. The primary inflammatory edema of the injected paw occurred rapidly and sustained over a couple of days, and the secondary inflammation developed 2 weeks later. The inflammatory edema was accompanied by upregulation of cytokines including ATF6, p66Shc, p22phox, gp91phox, and MMP-2 and an increase in ratio of p-Akt/Akt in the afflicted paw. These were suppressed by either argirein and rhein or ibuprofen. These findings indicate that ER stress, upregulated p66Shc, and phosphorylated Akt are actively implicated in the inflammatory zone caused by adjuvant injection. These biomarkers were causal factors responsible for inflammation of the afflicted paw and were suppressed by a supermolecule argirein and rhein, and the anti-inflammatory activities of the two compounds were comparable to that of ibuprofen.

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Acknowledgments

This work was supported by National Key New Drug Innovation Program of China no. 2009ZX09308 and the National Natural Science Foundation of China no. 81070145.

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Correspondence to De-Zai Dai.

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Xiao-Dong Cong and Ming-Jian Ding have made equal contributions to the paper.

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Cong, XD., Ding, MJ., Dai, DZ. et al. ER Stress, P66shc, and P-Akt/Akt Mediate Adjuvant-Induced Inflammation, Which Is Blunted by Argirein, a Supermolecule and Rhein in Rats. Inflammation 35, 1031–1040 (2012). https://doi.org/10.1007/s10753-011-9407-4

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