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Sigma-1 receptor subdues systemic inflammation

Systemic inflammation can be lethal, as in the case of septic shock. Rosen et al. hypothesized that the endoplasmic reticulum, now understood to affect inflammation, could be an untapped therapeutic target. They found that mice lacking the endoplasmic reticulum sigma-1 receptor had exacerbated responses to LPS or fecal slurry. The antidepressant fluvoxamine can bind sigma-1 and acts as an agonist. Therapeutic treatment of mice in the two inflammatory models revealed that fluvoxamine lowered inflammatory cytokine production and improved survival. Their results suggest that repurposing fluvoxamine to enhance sigma-1 activity may be beneficial for treating sepsis.

Abstract

Sepsis is an often deadly complication of infection in which systemic inflammation damages the vasculature, leading to tissue hypoperfusion and multiple organ failure. Currently, the standard of care for sepsis is predominantly supportive, with few therapeutic options available. Because of increased sepsis incidence worldwide, there is an urgent need for discovery of novel therapeutic targets and development of new treatments. The recently discovered function of the endoplasmic reticulum (ER) in regulation of inflammation offers a potential avenue for sepsis control. Here, we identify the ER-resident protein sigma-1 receptor (S1R) as an essential inhibitor of cytokine production in a preclinical model of septic shock. Mice lacking S1R succumb quickly to hypercytokinemia induced by a sublethal challenge in two models of acute inflammation. Mechanistically, we find that S1R restricts the endonuclease activity of the ER stress sensor IRE1 and cytokine expression but does not inhibit the classical inflammatory signaling pathways. These findings could have substantial clinical implications, as we further find that fluvoxamine, an antidepressant therapeutic with high affinity for S1R, protects mice from lethal septic shock and dampens the inflammatory response in human blood leukocytes. Our data reveal the contribution of S1R to the restraint of the inflammatory response and place S1R as a possible therapeutic target to treat bacterial-derived inflammatory pathology.
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Supplementary Material

Summary

Fig. S1. S1R deletion influences a subset of LPS-induced processes without causing global perturbation.
Fig. S2. Canonical TLR4 signaling in macrophages is unperturbed by S1R deletion.
Fig. S3. Gating strategy and quantification of immunophenotyping on blood.
Fig. S4. Gating strategy and quantification of immunophenotyping on peritoneal contents.
Fig .S5. Gating strategy and quantification of immunophenotyping on spleen and lymph node.
Fig. S6. S1R controls inflammation in primary fibroblasts.
Fig. S7. STF affects cytokine production in vitro and in vivo.
Fig. S8. Anti-inflammatory effect of FLV does not globally suppress cytokine production from human blood.
Fig. S9. Proposed mechanism of action of S1R during LPS-mediated inflammatory response.
Data file S1. Primary data (Excel file).

Resources

File (aau5266_data_file_s1.xlsx)
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Information & Authors

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Published In

Science Translational Medicine
Volume 11 | Issue 478
February 2019

Submission history

Received: 19 June 2018
Accepted: 15 January 2019

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Acknowledgments

We thank S. Arandjelovic and the BIG center (University of Virginia) for critical reading of the manuscript. Funding: The authors are supported by NIH grants R01 NS083542 and R21 NS101281 (to A.G.), the Owens Family Foundation (to A.G.), and T32 GM007055 (to D.A.R.). Author contributions: D.A.R. designed, performed, and analyzed the research and wrote the paper. S.M.S., A.F.-C., J.D.E., R.M.B., and J.A.W. performed the research. A.G. designed and analyzed the research and wrote the paper. Competing interests: D.A.R. and A.G. are inventors on U.S. Provisional patent application no. 62/618,741 submitted by the University of Virginia entitled “Compositions and Methods for Regulating Inflammation.” The authors declare that they have no other competing interests. Data and materials availability: All data related to this study can be found in the paper and the Supplementary Materials.

Authors

Affiliations

Center for Brain Immunology and Glia, Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Graduate Program in Pharmacological Sciences, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Scott M. Seki
Center for Brain Immunology and Glia, Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Anthony Fernández-Castañeda https://orcid.org/0000-0002-0416-442X
Center for Brain Immunology and Glia, Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Center for Brain Immunology and Glia, Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Division of Asthma, Allergy and Immunology, Department of Medicine, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Judith A. Woodfolk
Division of Asthma, Allergy and Immunology, Department of Medicine, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.
Center for Brain Immunology and Glia, Department of Neuroscience, School of Medicine, University of Virginia, Charlottesville, VA 22908, USA.

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Notes

*Corresponding author. Email: [email protected]

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