Startseite Inhibition of interleukin-3- and interferon- α-induced JAK/STAT signaling by the synthetic α-X-2′,3,4,4′-tetramethoxychalcones α-Br-TMC and α-CF3-TMC
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Inhibition of interleukin-3- and interferon- α-induced JAK/STAT signaling by the synthetic α-X-2′,3,4,4′-tetramethoxychalcones α-Br-TMC and α-CF3-TMC

  • Belinda Jobst , Julia Weigl , Carina Michl , Fabio Vivarelli , Sophia Pinz , Sabine Amslinger und Anne Rascle EMAIL logo
Veröffentlicht/Copyright: 24. Juni 2016

Abstract

The JAK/STAT pathway is an essential mediator of cytokine signaling, often upregulated in human diseases and therefore recognized as a relevant therapeutic target. We previously identified the synthetic chalcone α-bromo-2′,3,4,4′-tetramethoxychalcone (α-Br-TMC) as a novel JAK2/STAT5 inhibitor. We also found that treatment with α-Br-TMC resulted in a downward shift of STAT5 proteins in SDS-PAGE, suggesting a post-translational modification that might affect STAT5 function. In the present study, we show that a single cysteine within STAT5 is responsible for the α-Br-TMC-induced protein shift, and that this modification does not alter STAT5 transcriptional activity. We also compared the inhibitory activity of α-Br-TMC to that of another synthetic chalcone, α-trifluoromethyl-2′,3,4,4′-tetramethoxychalcone (α-CF3-TMC). We found that, like α-Br-TMC, α-CF3-TMC inhibits JAK2 and STAT5 phosphorylation in response to interleukin-3, however without altering STAT5 mobility in SDS-PAGE. Moreover, we demonstrate that both α-Br-TMC and α-CF3-TMC inhibit interferon-α-induced activation of STAT1 and STAT2, by inhibiting their phosphorylation and the expression of downstream interferon-stimulated genes. Together with the previous finding that α-Br-TMC and α-CF3-TMC inhibit the response to inflammation by inducing Nrf2 and blocking NF-κB activities, our data suggest that synthetic chalcones might be useful as anti-inflammatory, anti-cancer and immunomodulatory agents in the treatment of human diseases.

Acknowledgments

We thank Jacqueline Marvel and Daniela Männel for providing the Ba/F3 and HeLa cells, respectively. We thank Elisabeth Besl and Susanne Brüggemann for their excellent technical support. We are grateful to Joachim Griesenbeck for critically reading the manuscript. This work was supported by the Deutsche Forschungsgemeinschaft (Grant No. RA 2010/2-1 to A.R.), the Deutsche Krebshilfe (Grant No. 109750 to A.R.), institutional research funds, University of Regensburg (Förderlinie C to A.R.; Frauenförderung, Bayerisches Programm zur Realisierung der Chancengleichheit für Frauen in Forschung und Lehre, to S.P.), and the Fonds der Chemischen Industrie (Liebig scholarship to S.A.).

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Supplemental Material:

The online version of this article (DOI: 10.1515/hsz-2016-0148) offers supplementary material, available to authorized users.


Received: 2016-3-8
Accepted: 2016-6-21
Published Online: 2016-6-24
Published in Print: 2016-11-1

©2016 Walter de Gruyter GmbH, Berlin/Boston

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