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Isoeugenol destabilizes IL-8 mRNA expression in THP-1 cells through induction of the negative regulator of mRNA stability tristetraprolin

  • Molecular Toxicology
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Abstract

We previously demonstrated in the human promyelocytic cell line THP-1 that all allergens tested, with the exception of the prohapten isoeugenol, induced a dose-related release of interleukin-8 (IL-8). In the present study, we investigated whether this abnormal behavior was regulated by the AU-rich element–binding proteins HuR and tristetraprolin (TTP) or by the downstream molecule suppressor of cytokine signaling (SOCS)-3. The contact allergens isoeugenol, diethylmaleate (DEM), and 2,4-dinitrochlorobenzene (DNCB), and the irritant salicylic acid were used as reference compounds. Chemicals were used at concentrations that induced a 20% decrease in cell viability as assessed by propidium iodide staining, namely 100 μg/ml (0.61 mM) for isoeugenol, 100 μg/ml (0.58 mM) for DEM, 3 μg/ml (14.8 μM) for DNCB, and 250 μg/ml (1.81 mM) for salicylic acid. Time course experiments of IL-8 mRNA expression and assessment of IL-8 mRNA half-life, indicated a decreased IL-8 mRNA stability in isoeugenol-treated cells. We could demonstrate that a combination and regulation of HuR and TTP following exposure to contact allergens resulted in a different modulation of IL-8 mRNA half-life and release. The increased expression of TTP in THP-1 cells treated with isoeugenol results in destabilization of the IL-8 mRNA, which can account for the lack of IL-8 release. In contrast, the strong allergen DNCB failing to up-regulate TTP, while inducing HuR, resulted in longer IL-8 mRNA half-life and protein release. SOCS-3 was induced only in isoeugenol-treated cells; however, its modulation did not rescue the lack of IL-8 release, indicating that it is unlikely to be involved in the lack of IL-8 production. Finally, the destabilization effect of isoeugenol on IL-8 mRNA expression together with SOCS-3 expression resulted in an anti-inflammatory effect, as demonstrated by the ability of isoeugenol to modulate LPS or ionomycin-induced cytokine release.

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Acknowledgments

We would like to thank Professor Henk Van Loveren for his review and helpful suggestions. This research was supported by the EU grant SENS-IT-IV #018681 and by the 2008 Eurotox, HSUS, P&G Animal Welfare and Alternatives Award.

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Authors declare not having any financial or personal interest, nor having an association with any individuals or organizations that could have influenced inappropriately the submitted work.

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Correspondence to Emanuela Corsini.

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Galbiati, V., Carne, A., Mitjans, M. et al. Isoeugenol destabilizes IL-8 mRNA expression in THP-1 cells through induction of the negative regulator of mRNA stability tristetraprolin. Arch Toxicol 86, 239–248 (2012). https://doi.org/10.1007/s00204-011-0758-2

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