The regulatory landscape of macrophage interferon signaling in inflammation
Ricky Siebeler, Menno P.J. de Winther, Marten A. Hoeksema
Abstract
The pervasive role of the innate immune system is established by interferons. Emerging research shows an underappreciated ability of macrophages to regulate and propagate interferon responses in infectious and autoinflammatory disease states. In this review, we will discuss recent findings demonstrating the immunomodulating effects of macrophage interferon signaling. Apart from provoking cellular antimicrobial defenses, interferons augment the inflammatory activity of macrophages. These immunologic adaptations place the macrophage in the center of the interferon system and at the forefront of immunity. Consequently, macrophages are implicated in the pathogenesis of interferon-driven autoinflammatory disorders, such as SLE. In these disease states, the recognition of immunogenic ligands triggers macrophages to adopt an inflammatory phenotype through interferon signaling. This will amplify immune responses, eventually leading to autoinflammation. A better understanding of the macrophage’s role in interferon signaling will support the future elucidation of novel targets amendable for clinical treatment. The pervasive role of the innate immune system is established by interferons. Emerging research shows an underappreciated ability of macrophages to regulate and propagate interferon responses in infectious and autoinflammatory disease states. In this review, we will discuss recent findings demonstrating the immunomodulating effects of macrophage interferon signaling. Apart from provoking cellular antimicrobial defenses, interferons augment the inflammatory activity of macrophages. These immunologic adaptations place the macrophage in the center of the interferon system and at the forefront of immunity. Consequently, macrophages are implicated in the pathogenesis of interferon-driven autoinflammatory disorders, such as SLE. In these disease states, the recognition of immunogenic ligands triggers macrophages to adopt an inflammatory phenotype through interferon signaling. This will amplify immune responses, eventually leading to autoinflammation. A better understanding of the macrophage’s role in interferon signaling will support the future elucidation of novel targets amendable for clinical treatment. Interferons (IFNs) underlie the competence of the innate immune system to ward off pathogens. In viral infections, IFNs are secreted to induce an antiviral state in host cells, supporting our first line of defense against pathogens.1Durbin J.E. Fernandez-Sesma A. Lee C.K. Rao T.D. Frey A.B. Moran T.M. et al.Type I IFN modulates innate and specific antiviral immunity.J Immunol. 2000; 164: 4220-4228Crossref PubMed Google Scholar Moreover, IFNs recruit leukocytes to the site of infection and augment their activity.2Lee A.J. Ashkar A.A. The dual nature of type I and type II interferons.Front Immunol. 2018; 9: 2061Crossref PubMed Scopus (343) Google Scholar These measures ultimately aim to interfere with viral replication and dissemination, curtailing the infection. Perturbed IFN responses may therefore underlie severity and susceptibility to viral infections.3Posseme C. Llibre A. Charbit B. Bondet V. Rouilly V. Saint-André V. et al.Early IFNβ secretion determines variable downstream IL-12p70 responses upon TLR4 activation.Cell Rep. 2022; 39110989Abstract Full Text Full Text PDF PubMed Scopus (0) Google Scholar Predictably, impaired IFN responses are a hallmark of severe COVID-19 manifestation.4Stertz S. Hale B.G. Interferon system deficiencies exacerbating severe pandemic virus infections.Trends Microbiol. 2021; 29: 973-982Abstract Full Text Full Text PDF PubMed Scopus (0) Google Scholar,5Hadjadj J. Yatim N. Barnabei L. Corneau A. Boussier J. Smith N. et al.Impaired type I interferon activity and inflammatory responses in severe COVID-19 patients.Science (1979). 2020; 369: 718-724Crossref PubMed Scopus (0) Google Scholar More than half a century of research since their discovery, the role of IFNs is now known to extend well beyond antiviral responses. Namely, IFNs orchestrate various distinct homeostatic processes and immune responses to maintain physiological integrity.6Place D.E. Malireddi R.K.S. Kim J. Vogel P. Yamamoto M. Kanneganti T.D. Osteoclast fusion and bone loss are restricted by interferon inducible guanylate binding proteins.Nat Commun. 2021; 12: 1-9Crossref PubMed Scopus (35) Google Scholar,7Katlinskaya Y.V. Katlinski K.V. Lasri A. Li N. Beiting D.P. Durham A.C. et al.Type I interferons control proliferation and function of the intestinal epithelium.Mol Cell Biol. 2016; 36: 1124-1135Crossref PubMed Scopus (26) Google Scholar Accordingly, disconcerted IFN responses have long been implicated to drive various autoinflammatory disorders, such as SLE and Aicardi-Goutières syndrome. In addition, IFNs commonly contribute to local or systemic inflammation as seen in rheumatoid arthritis and macrophage activation syndrome. Because perturbed IFN signaling appears as a common denominator in these conditions, they are now widely recognized as so-called interferonopathies. The pervasive role of IFNs necessitates investigative efforts into all facets of the IFN system to infer clinically relevant targets to reduce the burden of inflammatory disease. The IFN system is directed toward interfering with microbial dissemination, principally by enhancing interferon-stimulated gene (ISG) expression. On infection, nearly any host cell will produce IFNs as an intrinsic response against microbials, but also to protect neighboring cells and activate leukocytes. Purposely, some leukocytes are competent producers of IFNs themselves and highly responsive to the regulatory effects of IFNs, forming a feed-forward loop. The capacity of leukocytes to produce IFNs is dependent on cell lineage and cellular microenvironment, like the presence of pathogens and cytokines. Classically, there are lineages of cells specialized in the secretion of specific types of IFNs. For instance, plasmacytoid dendritic cells are accepted to be the predominant producers of type I and type III IFNs, whereas T cells are the foremost type II IFN-secreting leukocytes.8Fitzgerald-Bocarsly P. Dai J. Singh S. Plasmacytoid dendritic cells and type I IFN: 50 years of convergent history.Cytokine Growth Factor Rev. 2008; 19: 3Crossref PubMed Scopus (261) Google Scholar, 9Psarras A. Alase A. Antanaviciute A. Carr I.M. 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A.C. of macrophages in understanding on Immunol. 2021; 12: Scholar macrophages are of by on the role of and in innate immune responses. recognition a of macrophages to such as The to for IFN responses are such as and such as gene and gene their of and to viral and macrophages to an of in response to their the of an IFN Apart from IFNs, macrophages are responsive to IFNs, in the center of the IFN J.E. Fernandez-Sesma A. Lee C.K. Rao T.D. Frey A.B. Moran T.M. et al.Type I IFN modulates innate and specific antiviral immunity.J Immunol. 2000; 164: 4220-4228Crossref PubMed Google S. A. L. J. S. of type I interferons in infectious plasmacytoid dendritic cells in the Immunol. PubMed Scopus Google Scholar this role also macrophages in interferons in 2020; Scopus Google A. 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