Abstract
The NLRP3 inflammasome is an intracellular multiple-protein complex that controls the maturation and release of interleukin (IL)-1β and IL-18. Endogenous carbon monoxide (CO) is anti-inflammatory. The aim of this study was to assess the effects/mechanisms of CO-releasing molecule-3 (CORM-3)-dependent modulation of the NLRP3 inflammasome in cardiac fibroblasts (CF) and its effect on myocardial function in sepsis. CF were treated with CORM-3 or inactive CORM-3 (iCORM-3) before NLRP3 inflammasome priming with lipopolysaccharides (LPS) or following activation with adenosine triphosphate (ATP). In parallel, cardiomyocytes (CM) were challenged with supernatants of LPS/ATP-stimulated CF or a cytokine mixture (Cyto-mix) containing IL-1β, IL-18, and HMGB1. In vivo, mice were treated with CORM-3 before or after LPS to induce sepsis (endotoxemia). Pretreatment of CF with CORM-3 prevented an LPS-induced increase in NLRP3 and pro-IL-1β expression. Treatment of CF with CORM-3 before ATP prevented ATP-induced activation of the NLRP3 inflammasome. Challenging CF with LPS/ATP promoted NLRP3 interactions with adaptor ASC (apoptosis-associated speck-like protein containing a caspase-recruitment domain), which was prevented by CORM-3. Challenging CM with supernatants of CF with LPS/ATP or Cyto-mix (IL-1β, IL-18, and HMGB1) resulted in CM apoptosis, which was attenuated with either a CORM-3 or IL-1 receptor antagonist. Finally, myocardial NLRP3 inflammasome activation and myocardial dysfunction in septic mice were abolished by CORM-3. In NLRP3-deficient mice with sepsis, CORM-3 did not show additional benefits in improving myocardial function. Our results indicate that CORM-3 suppresses NLRP3 inflammasome activation by blocking NLRP3 interactions with the adaptor protein ASC and attenuates myocardial dysfunction in mice with sepsis.
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Acknowledgements
We thank Ms. Xuemei Xu for performing mouse myocardial function measurement. This work was supported by Grants from Lawson Health Research Institute IRF 2014-25, National Natural Science Foundation of China 81370333, Natural Science Foundation of Jiangsu Province, China BK2015-1332 and by the “Six Talent Peaks” Training Program, Jiangsu, China WSN-079.
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W. Zhang and A. Tao contributed equally to this work.
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Zhang, W., Tao, A., Lan, T. et al. Carbon monoxide releasing molecule-3 improves myocardial function in mice with sepsis by inhibiting NLRP3 inflammasome activation in cardiac fibroblasts. Basic Res Cardiol 112, 16 (2017). https://doi.org/10.1007/s00395-017-0603-8
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DOI: https://doi.org/10.1007/s00395-017-0603-8