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Norepinephrine-induced interleukin-6 increase in rat hearts: differential signal transduction in myocytes and non-myocytes

  • Cell and Molecular Physiology
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Abstract

Continuous i.v. infusion of norepinephrine in rats has been shown to induce early interleukin (IL)-6 mRNA expression in the left ventricle (LV) which was followed by hypertrophy and fibrosis. In this study, two approaches were used. In the first, NE (0.1 mg/kg per hour) was infused i.v. in rats for several time periods, and freshly obtained ventricular myocardium was dissociated into myocyte (MC) and non-myocyte (NMC) fractions. Second, isolated adult MCs and fibroblasts were treated with NE (10 μM). NE infusion (4 h, in vivo) caused an 11-fold increase in IL-6 mRNA in both cell populations. In vitro treatment of isolated adult MCs for 2 h and of fibroblasts for 1 h with NE induced a 3.5- and 23-fold maximum increase, respectively, in IL-6 mRNA. After in vivo NE treatment, the expression of the mRNA of the transcriptional factor of IL-6, C/EBP-β, was elevated earlier (after 45 min of NE infusion) than IL-6 mRNA (after 4 h) and was seen in MCs and NMCs. The mRNAs of both receptors of IL-6, the soluble IL6R and gp130, were increased subsequently to IL-6 mRNA. Gp130 was elevated after 24 h and, like IL6R, predominantly in NMCs. In contrast, the IL6R protein and the downstream regulator STAT3 were increased only in MCs after 24 h of NE infusion. The mRNA of C/EBP-δ, which is regulated by STAT3, was elevated only in myocytes.

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Acknowledgements

This work was supported by the Deutsche Forschungsgemeinschaft (ZI 199/10-3, ZI 199/10-4), by a grant from the Medical Faculty of the University of Leipzig (formel.1-10) and by a grant of BMBF (NBL-3-Förderung; Kennzeichen 01ZZ0106). The excellent technical assistance of Grit Marx is gratefully appreciated.

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Authors and Affiliations

  1. Carl-Ludwig-Institute of Physiology, University of Leipzig, Liebigstrasse 27, 04103, Leipzig, Germany

    W. Briest, B. Raßler, A. Deten, M. Leicht & H.-G. Zimmer

  2. Max-Delbrück-Center for Molecular Medicine, Berlin-Buch, Germany

    R. Morwinski, D. Neichel & G. Wallukat

  3. Department of Experimental Cardiology, Max-Planck-Institute, Bad Nauheim, Germany

    T. Ziegelhöffer

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  1. W. Briest
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  2. B. Raßler
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  9. H.-G. Zimmer
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Correspondence to W. Briest.

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Briest, W., Raßler, B., Deten, A. et al. Norepinephrine-induced interleukin-6 increase in rat hearts: differential signal transduction in myocytes and non-myocytes. Pflugers Arch - Eur J Physiol 446, 437–446 (2003). https://doi.org/10.1007/s00424-003-1043-x

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