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Gupta S, Cassel SL, Sutterwala FS. Inflammasome-Independent Roles of NLR and ALR Family Members. Methods Mol Biol 2023; 2696:29-45. [PMID: 37578713 DOI: 10.1007/978-1-0716-3350-2_2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/15/2023]
Abstract
Pattern recognition receptors, including members of the NLR and ALR families, are essential for recognition of both pathogen- and host-derived danger signals. Several members of these families, including NLRP1, NLRP3, NLRC4, and AIM2, are capable of forming multiprotein complexes, called inflammasomes, that result in the activation of pro-inflammatory caspase-1. However, in addition to the formation of inflammasomes, a number of these family members exert inflammasome-independent functions. Here, we will discuss inflammasome-independent functions of NLRC4, NLRP12, and AIM2 and examine their roles in regulating innate and adaptive immune processes.
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Affiliation(s)
- Suman Gupta
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Suzanne L Cassel
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA
- Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA
| | - Fayyaz S Sutterwala
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
- Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, CA, USA.
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2
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Gupta S, Matsunaga J, Cassel SL, Haake DA, Sutterwala FS. Leptospira spp. are a potent activator of Type I IFN responses via the cGAS-STING pathway. The Journal of Immunology 2022. [DOI: 10.4049/jimmunol.208.supp.51.04] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Abstract
Leptospirosis is a widespread zoonotic disease which can be potentially fatal in infected humans and dogs. The spirochetal bacteria Leptospira interrogans is the major causative agent of leptospirosis. Rodents serve as reservoir hosts for L. interrogans and once colonized they continue to shed bacteria in their urine. The host immune response to Leptospira spp. remains poorly defined. Leptospiral lipopolysaccharide and lipoproteins can activate TLR4 and TLR2. In addition, leptospires have been shown to activate the NLRP3 inflammasome in macrophages. We observed that when compared to other Gram-negative bacteria, L. interrogans induced a poor inflammasome response with little or no notable pyroptosis. In contrast, L. interrogans induced a robust type I IFN responses in both mouse macrophages and human monocytes. The L. interrogans-induced type I IFN response was dependent on both cGAS and STING and resulted in rapid phosphorylation of TBK1 and IRF3. Furthermore, supernatants from infected macrophages were capable of inducing IFNβ expression in uninfected macrophages, suggesting paracrine signaling from infected cells. These studies demonstrate that L. interrogans can drive a cGAS-STING dependent type I IFN response that may contribute to the host defense against this pathogen.
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Affiliation(s)
- Suman Gupta
- 1Department of Medicine, Cedars Sinai Med. Ctr
| | - James Matsunaga
- 2Division of infectious diseases, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
| | | | - David A. Haake
- 2Division of infectious diseases, VA Greater Los Angeles Healthcare System, Los Angeles, CA, USA
- 3Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
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3
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Hardy KS, Tuckey AN, Housley NA, Andrews J, Patel M, Al-Mehdi AB, Barrington RA, Cassel SL, Sutterwala FS, Audia JP. The Pseudomonas aeruginosa Type III Secretion System Exoenzyme Effector ExoU Induces Mitochondrial Damage in a Murine Bone Marrow-Derived Macrophage Infection Model. Infect Immun 2022; 90:e0047021. [PMID: 35130452 PMCID: PMC8929383 DOI: 10.1128/iai.00470-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 01/18/2022] [Indexed: 11/20/2022] Open
Abstract
Pseudomonas aeruginosa is a Gram-negative, opportunistic pathogen that causes nosocomial pneumonia, urinary tract infections, and bacteremia. A hallmark of P. aeruginosa pathogenesis is disruption of host cell function by the type III secretion system (T3SS) and its cognate exoenzyme effectors. The T3SS effector ExoU is phospholipase A2 (PLA2) that targets the host cell plasmalemmal membrane to induce cytolysis and is an important virulence factor that mediates immune avoidance. In addition, ExoU has been shown to subvert the host inflammatory response in a noncytolytic manner. In primary bone marrow-derived macrophages (BMDMs), P. aeruginosa infection is sensed by the nucleotide-binding domain containing leucine-rich repeats-like receptor 4 (NLRC4) inflammasome, which triggers caspase-1 activation and inflammation. ExoU transiently inhibits NLRC4 inflammasome-mediated activation of caspase-1 and its downstream target, interleukin 1β (IL-1β), to suppress activation of inflammation. In the present study, we sought to identify additional noncytolytic virulence functions for ExoU and discovered an unexpected association between ExoU, host mitochondria, and NLRC4. We show that infection of BMDMs with P. aeruginosa strains expressing ExoU elicited mitochondrial oxidative stress. In addition, mitochondria and mitochondrion-associated membrane fractions enriched from infected cells exhibited evidence of autophagy activation, indicative of damage. The observation that ExoU elicited mitochondrial stress and damage suggested that ExoU may also associate with mitochondria during infection. Indeed, ExoU phospholipase A2 enzymatic activity was present in enriched mitochondria and mitochondrion-associated membrane fractions isolated from P. aeruginosa-infected BMDMs. Intriguingly, enriched mitochondria and mitochondrion-associated membrane fractions isolated from infected Nlrc4 homozygous knockout BMDMs displayed significantly lower levels of ExoU enzyme activity, suggesting that NLRC4 plays a role in the ExoU-mitochondrion association. These observations prompted us to assay enriched mitochondria and mitochondrion-associated membrane fractions for NLRC4, caspase-1, and IL-1β. NLRC4 and pro-caspase-1 were detected in enriched mitochondria and mitochondrion-associated membrane fractions isolated from noninfected BMDMs, and active caspase-1 and active IL-1β were detected in response to P. aeruginosa infection. Interestingly, ExoU inhibited mitochondrion-associated caspase-1 and IL-1β activation. The implications of ExoU-mediated effects on mitochondria and the NLRC4 inflammasome during P. aeruginosa infection are discussed.
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Affiliation(s)
- Kierra S. Hardy
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Amanda N. Tuckey
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Nicole A. Housley
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Joel Andrews
- Mitchell Cancer Institute, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Mita Patel
- Department of Pharmcology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Abu-Bakr Al-Mehdi
- Department of Pharmcology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Robert A. Barrington
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
| | - Suzanne L. Cassel
- Women’s Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Fayyaz S. Sutterwala
- Women’s Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Jonathon P. Audia
- Department of Microbiology and Immunology, University of South Alabama College of Medicine, Mobile, Alabama, USA
- Center for Lung Biology, University of South Alabama College of Medicine, Mobile, Alabama, USA
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4
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Ohashi K, Wang Z, Yang YM, Billet S, Tu W, Pimienta M, Cassel SL, Pandol SJ, Lu SC, Sutterwala FS, Bhowmick N, Seki E. NOD-like receptor C4 Inflammasome Regulates the Growth of Colon Cancer Liver Metastasis in NAFLD. Hepatology 2019; 70:1582-1599. [PMID: 31044438 PMCID: PMC6819206 DOI: 10.1002/hep.30693] [Citation(s) in RCA: 46] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/19/2018] [Accepted: 04/23/2019] [Indexed: 12/16/2022]
Abstract
Nonalcoholic fatty liver disease (NAFLD) enhances the growth and recurrence of colorectal cancer (CRC) liver metastasis. With the rising prevalence of NAFLD, a better understanding of the molecular mechanism underlying NAFLD-associated liver metastasis is crucial. Tumor-associated macrophages (TAMs) constitute a large portion of the tumor microenvironment that promotes tumor growth. NOD-like receptor C4 (NLRC4), a component of an inflammasome complex, plays a role in macrophage activation and interleukin (IL)-1β processing. We aimed to investigate whether NLRC4-mediated TAM polarization contributes to metastatic liver tumor growth in NAFLD. Wild-type and NLRC4-/- mice were fed low-fat or high-fat diet for 6 weeks followed by splenic injection of mouse CRC MC38 cells. The tumors were analyzed 2 weeks after CRC cell injection. High-fat diet-induced NAFLD significantly increased the number and size of CRC liver metastasis. TAMs and CD206-expressing M2 macrophages accumulated markedly in tumors in the presence of NAFLD. NAFLD up-regulated the expression of IL-1β, NLRC4, and M2 markers in tumors. In NAFLD, but not normal livers, deletion of NLRC4 decreased liver tumor growth accompanied by decreased M2 TAMs and IL-1β expression in tumors. Wild-type mice showed increased vascularity and vascular endothelial growth factor (VEGF) expression in tumors with NAFLD, but these were reduced in NLRC4-/- mice. When IL-1 signaling was blocked by recombinant IL-1 receptor antagonist, liver tumor formation and M2-type macrophages were reduced, suggesting that IL-1 signaling contributes to M2 polarization and tumor growth in NAFLD. Finally, we found that TAMs, but not liver macrophages, produced more IL-1β and VEGF following palmitate challenge. Conclusion: In NAFLD, NLRC4 contributes to M2 polarization, IL-1β, and VEGF production in TAMs, which promote metastatic liver tumor growth.
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Affiliation(s)
- Koichiro Ohashi
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Zhijun Wang
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Gastroenterology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yoon Mee Yang
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,College of Pharmacy, Kangwon National University, Chuncheon 24341, South Korea
| | - Sandrine Billet
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Wei Tu
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Gastroenterology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Michael Pimienta
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Suzanne L. Cassel
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Stephen J. Pandol
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Medicine, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, California 90048, USA
| | - Shelly C. Lu
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Medicine, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, California 90048, USA
| | - Fayyaz S. Sutterwala
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA
| | - Neil Bhowmick
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Medicine, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, California 90048, USA
| | - Ekihiro Seki
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Biomedical Sciences, Cedars-Sinai Medical Center, Los Angeles, California 90048, USA,Department of Medicine, University of California Los Angeles, David Geffen School of Medicine, Los Angeles, California 90048, USA
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5
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Borbón TY, Scorza BM, Clay GM, Lima Nobre de Queiroz F, Sariol AJ, Bowen JL, Chen Y, Zhanbolat B, Parlet CP, Valadares DG, Cassel SL, Nauseef WM, Horswill AR, Sutterwala FS, Wilson ME. Coinfection with Leishmania major and Staphylococcus aureus enhances the pathologic responses to both microbes through a pathway involving IL-17A. PLoS Negl Trop Dis 2019; 13:e0007247. [PMID: 31107882 PMCID: PMC6527190 DOI: 10.1371/journal.pntd.0007247] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 02/15/2019] [Indexed: 12/12/2022] Open
Abstract
Cutaneous leishmaniasis (CL) is a parasitic disease causing chronic, ulcerating skin lesions. Most humans infected with the causative Leishmania protozoa are asymptomatic. Leishmania spp. are usually introduced by sand flies into the dermis of mammalian hosts in the presence of bacteria from either the host skin, sand fly gut or both. We hypothesized that bacteria at the dermal inoculation site of Leishmania major will influence the severity of infection that ensues. A C57BL/6 mouse ear model of single or coinfection with Leishmania major, Staphylococcus aureus, or both showed that single pathogen infections caused localized lesions that peaked after 2–3 days for S. aureus and 3 weeks for L. major infection, but that coinfection produced lesions that were two-fold larger than single infection throughout 4 weeks after coinfection. Coinfection increased S. aureus burdens over 7 days, whereas L. major burdens (3, 7, 28 days) were the same in singly and coinfected ears. Inflammatory lesions throughout the first 4 weeks of coinfection had more neutrophils than did singly infected lesions, and the recruited neutrophils from early (day 1) lesions had similar phagocytic and NADPH oxidase capacities. However, most neutrophils were apoptotic, and transcription of immunomodulatory genes that promote efferocytosis was not upregulated, suggesting that the increased numbers of neutrophils may, in part, reflect defective clearance and resolution of the inflammatory response. In addition, the presence of more IL-17A-producing γδ and non-γδ T cells in early lesions (1–7 days), and L. major antigen-responsive Th17 cells after 28 days of coinfection, with a corresponding increase in IL-1β, may recruit more naïve neutrophils into the inflammatory site. Neutralization studies suggest that IL-17A contributed to an enhanced inflammatory response, whereas IL-1β has an important role in controlling bacterial replication. Taken together, these data suggest that coinfection of L. major infection with S. aureus exacerbates disease, both by promoting more inflammation and neutrophil recruitment and by increasing neutrophil apoptosis and delaying resolution of the inflammatory response. These data illustrate the profound impact that coinfecting microorganisms can exert on inflammatory lesion pathology and host adaptive immune responses. Cutaneous leishmaniasis (CL) is a vector-borne ulcerating skin disease affecting several million people worldwide. The causative Leishmania spp. protozoa are transmitted by infected phlebotomine sand flies. During a sand fly bite, bacteria can be coincidentally inoculated into the dermis with the parasite. Staphylococcus aureus is the most common bacterium in CL skin lesions. Symptomatic CL is characterized by papulonodular skin lesions that ulcerate and resolve with scarring, although most cutaneous Leishmania infections are asymptomatic. We sought to explore factors that determine whether infection with a cutaneous Leishmania species would result in symptomatic CL rather than asymptomatic infection. We hypothesized that local bacteria promote the development of symptomatic CL lesions during infection with Leishmania major. We discovered that cutaneous lesions were significantly larger in mice inoculated simultaneously with S. aureus and L. major than in mice infected with either organism alone. Coinfection led to increased S. aureus growth in skin lesions, whereas L. major parasite numbers were unchanged by coinfection. The size of the exacerbated lesion correlated with early increased numbers of neutrophils and elevated levels of proinflammatory cytokines IL-1β and IL-17A during the first 7 days, and with sustained increases in IL-17A through 28 days of coinfection. Neutralizing antibody experiments suggested IL-17A was partially responsible for lesion exacerbation during coinfection, whereas IL-1β was important for both control of early lesion exacerbation and promotion of IL-17A production. These data suggest that treatment of symptomatic CL targeting the parasite, local commensal bacteria, and host proinflammatory IL-17A immune responses might improve the outcome of CL.
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Affiliation(s)
- Tiffany Y. Borbón
- Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, United States of America
- Medical Scientist Training Program and the Carver College of Medicine, University of Iowa, Iowa City, IA, United States of America
| | - Breanna M. Scorza
- Interdisciplinary Ph.D. Program in Immunology, University of Iowa, Iowa City, IA, United States of America
| | - Gwendolyn M. Clay
- Medical Scientist Training Program and the Carver College of Medicine, University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Ph.D. Program in Molecular Medicine, University of Iowa, Iowa City, IA, United States of America
| | | | - Alan J. Sariol
- Interdisciplinary Ph.D. Program in Immunology, University of Iowa, Iowa City, IA, United States of America
| | - Jayden L. Bowen
- Medical Scientist Training Program and the Carver College of Medicine, University of Iowa, Iowa City, IA, United States of America
| | - Yani Chen
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
- Veterans’ Affairs Medical Center, Iowa City, IA, United States of America
| | - Bayan Zhanbolat
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
- Veterans’ Affairs Medical Center, Iowa City, IA, United States of America
| | - Corey P. Parlet
- Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, United States of America
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
| | - Diogo G. Valadares
- Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, United States of America
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
- Veterans’ Affairs Medical Center, Iowa City, IA, United States of America
- Conselho Nacional de Desenvolvimento Cientifico e Tecnológico (CNPq), Brasilia, Brazil
| | - Suzanne L. Cassel
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - William M. Nauseef
- Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, United States of America
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
- Veterans’ Affairs Medical Center, Iowa City, IA, United States of America
| | - Alexander R. Horswill
- Department of Immunology and Microbiology, University of Colorado Denver—Anschutz Medical Campus, Aurora, CO, United States of America
| | - Fayyaz S. Sutterwala
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA, United States of America
| | - Mary E. Wilson
- Department of Microbiology and Immunology, University of Iowa, Iowa City, IA, United States of America
- Medical Scientist Training Program and the Carver College of Medicine, University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Ph.D. Program in Immunology, University of Iowa, Iowa City, IA, United States of America
- Interdisciplinary Ph.D. Program in Molecular Medicine, University of Iowa, Iowa City, IA, United States of America
- Department of Internal Medicine, University of Iowa, Iowa City, Iowa City, IA, United States of America
- Iowa Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA, United States of America
- Veterans’ Affairs Medical Center, Iowa City, IA, United States of America
- * E-mail:
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Hornick EE, Dagvadorj J, Zacharias ZR, Miller AM, Langlois RA, Chen P, Legge KL, Bishop GA, Sutterwala FS, Cassel SL. Dendritic cell NLRC4 regulates influenza A virus-specific CD4 T cell responses through FasL expression. J Clin Invest 2019; 129:2888-2897. [PMID: 31038471 DOI: 10.1172/jci124937] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Influenza A virus (IAV)-specific T cell responses are important correlates of protection during primary and subsequent infections. Generation and maintenance of robust IAV-specific T cell responses relies on T cell interactions with dendritic cells (DCs). In this study, we explore the role of nucleotide-binding domain leucine-rich repeat containing receptor family member NLRC4 in modulating the DC phenotype during IAV infection. Nlrc4-/- mice had worsened survival and increased viral titers during infection, normal innate immune cell recruitment and IAV-specific CD8 T cell responses, but severely blunted IAV-specific CD4 T cell responses compared to wild-type mice. The defect in the pulmonary IAV-specific CD4 T cell response was not a result of defective priming or migration of these cells in Nlrc4-/- mice but was instead due to an increase in FasL+ DCs, resulting in IAV-specific CD4 T cell death. Together, our data support a novel role for NLRC4 in regulating the phenotype of lung DCs during a respiratory viral infection, and thereby influencing the magnitude of protective T cell responses.
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Affiliation(s)
- Emma E Hornick
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Jargalsaikhan Dagvadorj
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Zeb R Zacharias
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Ann M Miller
- Department of Surgery, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Ryan A Langlois
- Center for Immunology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Peter Chen
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Kevin L Legge
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA
| | - Gail A Bishop
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Veterans Affairs Medical Center, Iowa City, Iowa, USA
| | - Fayyaz S Sutterwala
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
| | - Suzanne L Cassel
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, USA.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California, USA.,Women's Guild Lung Institute, Cedars-Sinai Medical Center, Los Angeles, California, USA
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7
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Abstract
Mitochondria are functionally versatile organelles. In addition to their conventional role of meeting the cell's energy requirements, mitochondria also actively regulate innate immune responses against infectious and sterile insults. Components of mitochondria, when released or exposed in response to dysfunction or damage, can be directly recognized by receptors of the innate immune system and trigger an immune response. In addition, despite initiation that may be independent from mitochondria, numerous innate immune responses are still subject to mitochondrial regulation as discrete steps of their signaling cascades occur on mitochondria or require mitochondrial components. Finally, mitochondrial metabolites and the metabolic state of the mitochondria within an innate immune cell modulate the precise immune response and shape the direction and character of that cell's response to stimuli. Together, these pathways result in a nuanced and very specific regulation of innate immune responses by mitochondria.
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Key Words
- ASC, Apoptosis Associated Speck like protein containing CARD
- ASK1, apoptosis signal-regulating kinase 1
- ATP, adenosine tri-phosphate
- CAPS, cryopyrin associated periodic syndromes
- CARD, caspase activation and recruitment domain
- CL, cardiolipin
- CLR, C-type lectin receptor
- CREB, cAMP response element binding protein
- Cgas, cyclic GMP-AMP synthase
- DAMP, damage associated molecular pattern
- ESCIT, evolutionarily conserved signaling intermediate in the toll pathway
- ETC, electron transport chain
- FPR, formyl peptide receptor
- HIF, hypoxia-inducible factor
- HMGB1, high mobility group box protein 1
- IFN, interferon
- IL, interleukin
- IRF, interferon regulatory factor
- JNK, cJUN NH2-terminal kinase
- LPS, lipopolysaccharide
- LRR, leucine rich repeat
- MAPK, mitogen-activated protein kinase
- MARCH5, membrane-associated ring finger (C3HC4) 5
- MAVS, mitochondrial antiviral signaling
- MAVS, mitochondrial antiviral signaling protein
- MFN1/2, mitofusin
- MOMP, mitochondrial outer membrane permeabilization
- MPT, mitochondrial permeability transition
- MyD88, myeloid differentiation primary response 88
- NADH, nicotinamide adenine dinucleotide
- NBD, nucleotide binding domain
- NFκB, Nuclear factor κ B
- NLR, NOD like receptor
- NOD, nucleotide-binding oligomerization domain
- NRF2, nuclear factor erythroid 2-related factor 2
- PAMP, pathogen associated molecular pattern
- PPAR, peroxisome proliferator-accelerated receptor
- PRRs, pathogen recognition receptors
- RIG-I, retinoic acid inducible gene I
- RLR, retinoic acid inducible gene like receptor
- ROS, reactive oxygen species
- STING, stimulator of interferon gene
- TAK1, transforming growth factor-β-activated kinase 1
- TANK, TRAF family member-associated NFκB activator
- TBK1, TANK Binding Kinase 1
- TCA, Tri-carboxylic acid
- TFAM, mitochondrial transcription factor A
- TLR, Toll Like Receptor
- TRAF6, tumor necrosis factor receptor-associated factor 6
- TRIF, TIR-domain-containing adapter-inducing interferon β
- TUFM, Tu translation elongation factor.
- fMet, N-formylated methionine
- mROS, mitochondrial ROS
- mtDNA, mitochondrial DNA
- n-fp, n-formyl peptides
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Affiliation(s)
- Balaji Banoth
- Women's Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California
| | - Suzanne L Cassel
- Women's Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, California.
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8
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Allen JR, Ge L, Huang Y, Brauer R, Parimon T, Cassel SL, Sutterwala FS, Chen P. TIMP-1 Promotes the Immune Response in Influenza-Induced Acute Lung Injury. Lung 2018; 196:737-743. [PMID: 30167842 DOI: 10.1007/s00408-018-0154-2] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 08/24/2018] [Indexed: 12/11/2022]
Abstract
INTRODUCTION Influenza infects millions of people each year causing respiratory distress and death in severe cases. On average, 200,000 people annually are hospitalized in the United States for influenza related complications. Tissue inhibitor of metalloproteinase-1 (TIMP-1), a secreted protein that inhibits MMPs, has been found to be involved in lung inflammation. Here, we evaluated the role of TIMP-1 in the host response to influenza-induced lung injury. METHODS Wild-type (WT) and Timp1-deficient (Timp1-/-) mice that were 8-12 weeks old were administered A/PR/8/34 (PR8), a murine adapted H1N1 influenza virus, and euthanized 6 days after influenza installation. Bronchoalveolar lavage fluid and lungs were harvested from each mouse for ELISA, protein assay, PCR, and histological analysis. Cytospins were executed on bronchoalveolar lavage fluid to identify immune cells based on morphology and cell count. RESULTS WT mice experienced significantly more weight loss compared to Timp1-/- mice after influenza infection. WT mice demonstrated more immune cell infiltrate and airway inflammation. Interestingly, PR8 levels were identical between the WT and Timp1-/- mice 6 days post-influenza infection. CONCLUSION The data suggest that Timp1 promotes the immune response in the lungs after influenza infection facilitating an injurious phenotype as a result of influenza infection.
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Affiliation(s)
- Jenieke R Allen
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Lingyin Ge
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Ying Huang
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Rena Brauer
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Tanyalak Parimon
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Suzanne L Cassel
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Fayyaz S Sutterwala
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA
| | - Peter Chen
- Department of Medicine, Women's Guild Lung Institute, Cedars-Sinai Medical Center, 127 S. San Vicente Blvd, Los Angeles, CA, 90048, USA.
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9
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Elliott EI, Miller AN, Banoth B, Iyer SS, Stotland A, Weiss JP, Gottlieb RA, Sutterwala FS, Cassel SL. Cutting Edge: Mitochondrial Assembly of the NLRP3 Inflammasome Complex Is Initiated at Priming. J Immunol 2018; 200:3047-3052. [PMID: 29602772 DOI: 10.4049/jimmunol.1701723] [Citation(s) in RCA: 96] [Impact Index Per Article: 16.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 03/02/2018] [Indexed: 01/06/2023]
Abstract
The NLRP3 inflammasome is activated in response to microbial and danger signals, resulting in caspase-1-dependent secretion of the proinflammatory cytokines IL-1β and IL-18. Canonical NLRP3 inflammasome activation is a two-step process requiring both priming and activation signals. During inflammasome activation, NLRP3 associates with mitochondria; however, the role for this interaction is unclear. In this article, we show that mouse NLRP3 and caspase-1 independently interact with the mitochondrial lipid cardiolipin, which is externalized to the outer mitochondrial membrane at priming in response to reactive oxygen species. An NLRP3 activation signal is then required for the calcium-dependent association of the adaptor molecule ASC with NLRP3 on the mitochondrial surface, resulting in inflammasome complex assembly and activation. These findings demonstrate a novel lipid interaction for caspase-1 and identify a role for mitochondria as supramolecular organizing centers in the assembly and activation of the NLRP3 inflammasome.
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Affiliation(s)
- Eric I Elliott
- Interdisciplinary Graduate Program in Molecular Medicine, University of Iowa, Iowa City, IA 52242.,Medical Scientist Training Program, University of Iowa, Iowa City, IA 52242.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048.,The Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
| | - Alexis N Miller
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Balaji Banoth
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Shankar S Iyer
- The Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242.,Department of Neurology, University of Missouri School of Medicine, Columbia, MO 65212
| | - Aleksandr Stotland
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048; and.,Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Jerrold P Weiss
- The Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
| | - Roberta A Gottlieb
- Smidt Heart Institute, Cedars-Sinai Medical Center, Los Angeles, CA 90048; and.,Barbra Streisand Women's Heart Center, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Fayyaz S Sutterwala
- Interdisciplinary Graduate Program in Molecular Medicine, University of Iowa, Iowa City, IA 52242; .,Medical Scientist Training Program, University of Iowa, Iowa City, IA 52242.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048.,The Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
| | - Suzanne L Cassel
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048; .,The Inflammation Program, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242
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10
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Hornick EE, Banoth B, Miller AM, Zacharias ZR, Jain N, Wilson ME, Gibson-Corley KN, Legge KL, Bishop GA, Sutterwala FS, Cassel SL. Nlrp12 Mediates Adverse Neutrophil Recruitment during Influenza Virus Infection. J Immunol 2017; 200:1188-1197. [PMID: 29282312 DOI: 10.4049/jimmunol.1700999] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 11/28/2017] [Indexed: 12/23/2022]
Abstract
Exaggerated inflammatory responses during influenza A virus (IAV) infection are typically associated with severe disease. Neutrophils are among the immune cells that can drive this excessive and detrimental inflammation. In moderation, however, neutrophils are necessary for optimal viral control. In this study, we explore the role of the nucleotide-binding domain leucine-rich repeat containing receptor family member Nlrp12 in modulating neutrophilic responses during lethal IAV infection. Nlrp12-/- mice are protected from lethality during IAV infection and show decreased vascular permeability, fewer pulmonary neutrophils, and a reduction in levels of neutrophil chemoattractant CXCL1 in their lungs compared with wild-type mice. Nlrp12-/- neutrophils and dendritic cells within the IAV-infected lungs produce less CXCL1 than their wild-type counterparts. Decreased CXCL1 production by Nlrp12-/- dendritic cells was not due to a difference in CXCL1 protein stability, but instead to a decrease in Cxcl1 mRNA stability. Together, these data demonstrate a previously unappreciated role for Nlrp12 in exacerbating the pathogenesis of IAV infection through the regulation of CXCL1-mediated neutrophilic responses.
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Affiliation(s)
- Emma E Hornick
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Balaji Banoth
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Ann M Miller
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Zeb R Zacharias
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Nidhi Jain
- Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Mary E Wilson
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Veterans Affairs Medical Center, Iowa City, IA 52246; and
| | | | - Kevin L Legge
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Gail A Bishop
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Veterans Affairs Medical Center, Iowa City, IA 52246; and.,Department of Microbiology and Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Fayyaz S Sutterwala
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242.,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
| | - Suzanne L Cassel
- Interdisciplinary Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242; .,Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, CA 90048
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11
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McLinden JH, Bhattarai N, Stapleton JT, Chang Q, Kaufman TM, Cassel SL, Sutterwala FS, Haim H, Houtman JC, Xiang J. Yellow Fever Virus, but Not Zika Virus or Dengue Virus, Inhibits T-Cell Receptor-Mediated T-Cell Function by an RNA-Based Mechanism. J Infect Dis 2017; 216:1164-1175. [PMID: 28968905 PMCID: PMC5853456 DOI: 10.1093/infdis/jix462] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2017] [Accepted: 08/13/2017] [Indexed: 01/03/2023] Open
Abstract
The Flavivirus genus within the Flaviviridae family is comprised of many important human pathogens including yellow fever virus (YFV), dengue virus (DENV), and Zika virus (ZKV), all of which are global public health concerns. Although the related flaviviruses hepatitis C virus and human pegivirus (formerly named GBV-C) interfere with T-cell receptor (TCR) signaling by novel RNA and protein-based mechanisms, the effect of other flaviviruses on TCR signaling is unknown. Here, we studied the effect of YFV, DENV, and ZKV on TCR signaling. Both YFV and ZKV replicated in human T cells in vitro; however, only YFV inhibited TCR signaling. This effect was mediated at least in part by the YFV envelope (env) protein coding RNA. Deletion mutagenesis studies demonstrated that expression of a short, YFV env RNA motif (vsRNA) was required and sufficient to inhibit TCR signaling. Expression of this vsRNA and YFV infection of T cells reduced the expression of a Src-kinase regulatory phosphatase (PTPRE), while ZKV infection did not. YFV infection in mice resulted in impaired TCR signaling and PTPRE expression, with associated reduction in murine response to experimental ovalbumin vaccination. Together, these data suggest that viruses within the flavivirus genus inhibit TCR signaling in a species-dependent manner.
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Affiliation(s)
- James H McLinden
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Nirjal Bhattarai
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Jack T Stapleton
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
- Department of Microbiology, University of Iowa, Iowa City
| | - Qing Chang
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Thomas M Kaufman
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Suzanne L Cassel
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Fayyaz S Sutterwala
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Hillel Haim
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
| | - Jon C Houtman
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
- Department of Microbiology, University of Iowa, Iowa City
| | - Jinhua Xiang
- Research Service, Iowa City Veterans Affairs Medical Center
- Department of Internal Medicine, University of Iowa, Iowa City
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12
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Banoth B, Cassel SL. Bruton tyrosine kinase inhibition: Clinical relevance beyond B cells. J Allergy Clin Immunol 2017; 140:985-987. [PMID: 28456622 DOI: 10.1016/j.jaci.2017.03.041] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Revised: 03/09/2017] [Accepted: 03/23/2017] [Indexed: 01/05/2023]
Affiliation(s)
- Balaji Banoth
- Women's Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, Calif
| | - Suzanne L Cassel
- Women's Guild Lung Institute, Department of Medicine, Cedars-Sinai Medical Center, Los Angeles, Calif.
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13
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Janowski AM, Colegio OR, Hornick EE, McNiff JM, Martin MD, Badovinac VP, Norian LA, Zhang W, Cassel SL, Sutterwala FS. NLRC4 suppresses melanoma tumor progression independently of inflammasome activation. J Clin Invest 2016; 126:3917-3928. [PMID: 27617861 DOI: 10.1172/jci86953] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Accepted: 08/02/2016] [Indexed: 01/05/2023] Open
Abstract
Members of the NLR family can assemble inflammasome complexes with the adaptor protein ASC and caspase-1 that result in the activation of caspase-1 and the release of IL-1β and IL-18. Although the NLRC4 inflammasome is known to have a protective role in tumorigenesis, there is an increased appreciation for the inflammasome-independent actions of NLRC4. Here, we utilized a syngeneic subcutaneous murine model of B16F10 melanoma to explore the role of NLRC4 in tumor suppression. We found that NLRC4-deficient mice exhibited enhanced tumor growth that was independent of the inflammasome components ASC and caspase-1. Nlrc4 expression was critical for cytokine and chemokine production in tumor-associated macrophages and was necessary for the generation of protective IFN-γ-producing CD4+ and CD8+ T cells. Tumor progression was diminished when WT or caspase-1-deficient, but not NLRC4-deficient, macrophages were coinjected with B16F10 tumor cells in NLRC4-deficient mice. Finally, examination of human primary melanomas revealed the extensive presence of NLRC4+ tumor-associated macrophages. In contrast, there was a paucity of NLRC4+ tumor-associated macrophages observed in human metastatic melanoma, supporting the concept that NLRC4 expression controls tumor growth. These results reveal a critical role for NLRC4 in suppressing tumor growth in an inflammasome-independent manner.
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14
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Kolb R, Phan L, Borcherding N, Liu Y, Yuan F, Janowski AM, Xie Q, Markan KR, Li W, Potthoff MJ, Fuentes-Mattei E, Ellies LG, Knudson M, Lee MH, Yeung SCJ, Cassel SL, Sutterwala FS, Zhang W. Abstract B20: Obesity-induced Nlrc4 inflammasome promotes angiogenesis in breast cancer. Cancer Res 2016. [DOI: 10.1158/1538-7445.tme16-b20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Obesity, which impacts 36% of adults in the U.S., is associated with an increased risk of ER-positive breast cancer in postmenopausal women, increased incidence of the more aggressive triple negative breast cancer, increased risk of developing invasive ductal carcinoma (IDC) versus ductal carcinoma in situ (DCIS; non-invasive) and a worse clinical outcome. There have been many hypotheses to explain this link between obesity and breast cancer, but a causal mechanism is still largely missing. Here, using two syngeneic orthotopic transplant models in C57Bl/6 mice, we examined the role of obesity-associated inflammasome activation/IL-1 signaling in obesity-driven breast cancer progression. Our results show that the tumor microenvironment under the conditions of obesity promotes Nlrc4 inflammasome activation in tumor-infiltrating myeloid cells, which in turn leads to IL-1β activation which promotes tumor progression. Further studies show that obesity-induced Nlrc4 inflammasome activation/IL-1β promotes increased angiogenesis and upregulation of Vegfa, primarily in adipocytes. Finally, treatment of mice with Metformin inhibited obesity-associated angiogenesis and breast cancer progression. This data provides evidence for obesity-induced Nlrc4 inflammasome mediated activation of IL-1β as a causal mechanism for obesity-driven breast cancer progression and a rationale for blockade of IL-1 signaling, the use of anti-angiogenesis therapies, or treatment with metformin in obese breast cancer patients.
Citation Format: Ryan Kolb, Liem Phan, Nicholas Borcherding, Yinghong Liu, Fang Yuan, Ann M. Janowski, Qing Xie, Kathleen R. Markan, Wei Li, Matthew J. Potthoff, Enrique Fuentes-Mattei, Leslie G. Ellies, Michael Knudson, Mong-Hong Lee, Sai-Ching Jim Yeung, Suzanne L. Cassel, Fayyaz S. Sutterwala, Weizhou Zhang. Obesity-induced Nlrc4 inflammasome promotes angiogenesis in breast cancer. [abstract]. In: Proceedings of the AACR Special Conference: Function of Tumor Microenvironment in Cancer Progression; 2016 Jan 7–10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2016;76(15 Suppl):Abstract nr B20.
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Affiliation(s)
- Ryan Kolb
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
| | - Liem Phan
- 2The University of Texas MD Anderson Cancer Center, Houston, TX,
| | | | - Yinghong Liu
- 3Research Institute of Nephrology, Central South University, Changsha, Hunan, China,
| | - Fang Yuan
- 3Research Institute of Nephrology, Central South University, Changsha, Hunan, China,
| | - Ann M. Janowski
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
| | - Qing Xie
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
| | | | - Wei Li
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
| | | | | | - Leslie G. Ellies
- 4University of California San Diego, School of Medicine, San Diego, CA
| | - Michael Knudson
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
| | - Mong-Hong Lee
- 2The University of Texas MD Anderson Cancer Center, Houston, TX,
| | | | | | | | - Weizhou Zhang
- 1University of Iowa, Carver College of Medicine, Iowa City, IA,
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15
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Ciraci C, Janczy JR, Jain N, Haasken S, Pecli e Silva C, Benjamim CF, Sadler JJ, Olivier AK, Iwakura Y, Shayakhmetov DM, Sutterwala FS, Cassel SL. Immune Complexes Indirectly Suppress the Generation of Th17 Responses In Vivo. PLoS One 2016; 11:e0151252. [PMID: 26978520 PMCID: PMC4792482 DOI: 10.1371/journal.pone.0151252] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2015] [Accepted: 02/25/2016] [Indexed: 01/01/2023] Open
Abstract
The precise context in which the innate immune system is activated plays a pivotal role in the subsequent instruction of CD4+ T helper (Th) cell responses. Th1 responses are downregulated when antigen is encountered in the presence of antigen-IgG immune complexes. To assess if Th17 responses to antigen are subject to similar influences in the presence of immune complexes we utilized an inflammatory airway disease model in which immunization of mice with Complete Freund’s Adjuvant (CFA) and ovalbumin (Ova) induces a powerful Ova-specific Th1 and Th17 response. Here we show that modification of that immunization with CFA to include IgG-Ova immune complexes results in the suppression of CFA-induced Th17 responses and a concurrent enhancement of Ova-specific Th2 responses. Furthermore, we show the mechanism by which these immune complexes suppress Th17 responses is through the enhancement of IL-10 production. In addition, the generation of Th17 responses following immunization with CFA and Ova were dependent on IL-1α but independent of NLRP3 inflammasome activation. Together these data represent a novel mechanism by which the generation of Th17 responses is regulated.
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Affiliation(s)
- Ceren Ciraci
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Department of Molecular Biology and Genetics, Istanbul Technical University, Istanbul, Turkey
| | - John R. Janczy
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Nidhi Jain
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Stefanie Haasken
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Cyntia Pecli e Silva
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Claudia F. Benjamim
- Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jeffrey J. Sadler
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Alicia K. Olivier
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
| | - Yoichiro Iwakura
- Research Institute for Biomedical Sciences, Tokyo University of Science, Yamasaki 2669, Noda, Chiba, 278–0022, Japan
- Core Research for Evolutional Science and Technology (CREST), Japan Science and Technology Agency, Saitama, 332–0012, Japan
| | - Dmitry M. Shayakhmetov
- Lowance Center for Human Immunology, Department of Medicine, Emory University, Atlanta, Georgia, United States of America
| | - Fayyaz S. Sutterwala
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Veterans Affairs Medical Center, Iowa City, Iowa, United States of America
| | - Suzanne L. Cassel
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, Iowa, United States of America
- * E-mail:
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16
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Cassel SL, Elliott E, Iyer SS, Sutterwala F. Cardiolipin Provides a Platform for Caspase-1 Activation and NLRP3 Inflammasome Assembly. J Allergy Clin Immunol 2016. [DOI: 10.1016/j.jaci.2015.12.244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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17
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Janczy JR, Ciraci C, Haasken S, Iwakura Y, Olivier AK, Cassel SL, Sutterwala FS. Immune complexes inhibit IL-1 secretion and inflammasome activation. J Immunol 2014; 193:5190-8. [PMID: 25320279 DOI: 10.4049/jimmunol.1400628] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
IgG immune complexes have been shown to modify immune responses driven by APCs in either a pro- or anti-inflammatory direction depending upon the context of stimulation. However, the ability of immune complexes to modulate the inflammasome-dependent innate immune response is unknown. In this study, we show that IgG immune complexes suppress IL-1α and IL-1β secretion through inhibition of inflammasome activation. The mechanism by which this inhibition occurs is via immune complex ligation of activating FcγRs, resulting in prevention of both activation and assembly of the inflammasome complex in response to nucleotide-binding domain leucine-rich repeat (NLR) P3, NLRC4, or AIM2 agonists. In vivo, administration of Ag in the form of an immune complex during priming of the immune response inhibited resultant adaptive immune responses in an NLRP3-dependent model of allergic airway disease. Our data reveal an unexpected mechanism regulating CD4(+) T cell differentiation, by which immune complexes suppress inflammasome activation and the generation of IL-1α and IL-1β from APCs, which are critical for the Ag-driven differentiation of CD4(+) T cells.
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Affiliation(s)
- John R Janczy
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Ceren Ciraci
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Stefanie Haasken
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Yoichiro Iwakura
- Research Institute for Biomedical Sciences, Tokyo University of Science, Chiba 278-0022, Japan; Core Research for Evolutional Science and Technology, Japan Science and Technology Agency, Saitama 332-0012, Japan
| | - Alicia K Olivier
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242
| | - Suzanne L Cassel
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242; and
| | - Fayyaz S Sutterwala
- Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242; Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242; and Veterans Affairs Medical Center, Iowa City, IA 52241
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18
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Abstract
Inflammasomes continue to generate interest in an increasing number of disciplines owing to their unique ability to integrate a myriad of signals from pathogen- and damage-associated molecular patterns into a proinflammatory response. This potent caspase-1-dependent process is capable of activating the innate immune system, initiating pyroptosis (an inflammatory form of programmed cell death), and shaping adaptive immunity. The NLRP3 inflammasome is the most thoroughly studied of the inflammasome complexes that have been described thus far, perhaps owing to its disparate assortment of agonists. This review highlights our current understanding of the mechanisms of both priming and activation of the NLRP3 inflammasome.
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Affiliation(s)
- Fayyaz S Sutterwala
- Inflammation Program, University of Iowa, Iowa City, Iowa; Department of Internal Medicine, University of Iowa, Iowa City, Iowa; Veterans Affairs Medical Center, Iowa City, Iowa
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19
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Iyer SS, He Q, Janczy JR, Elliott EI, Zhong Z, Olivier AK, Sadler JJ, Knepper-Adrian V, Han R, Qiao L, Eisenbarth SC, Nauseef WM, Cassel SL, Sutterwala FS. Mitochondrial cardiolipin is required for Nlrp3 inflammasome activation. Immunity 2013; 39:311-323. [PMID: 23954133 DOI: 10.1016/j.immuni.2013.08.001] [Citation(s) in RCA: 626] [Impact Index Per Article: 56.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2012] [Accepted: 05/03/2013] [Indexed: 12/19/2022]
Abstract
Nlrp3 inflammasome activation occurs in response to numerous agonists but the specific mechanism by which this takes place remains unclear. All previously evaluated activators of the Nlrp3 inflammasome induce the generation of mitochondrial reactive oxygen species (ROS), suggesting a model in which ROS is a required upstream mediator of Nlrp3 inflammasome activation. Here we have identified the oxazolidinone antibiotic linezolid as a Nlrp3 agonist that activates the Nlrp3 inflammasome independently of ROS. The pathways for ROS-dependent and ROS-independent Nlrp3 activation converged upon mitochondrial dysfunction and specifically the mitochondrial lipid cardiolipin. Cardiolipin bound to Nlrp3 directly and interference with cardiolipin synthesis specifically inhibited Nlrp3 inflammasome activation. Together these data suggest that mitochondria play a critical role in the activation of the Nlrp3 inflammasome through the direct binding of Nlrp3 to cardiolipin.
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Affiliation(s)
- Shankar S Iyer
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Qiong He
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - John R Janczy
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Eric I Elliott
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Molecular and Cellular Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Zhenyu Zhong
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153, USA
| | - Alicia K Olivier
- Department of Pathology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Jeffrey J Sadler
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Vickie Knepper-Adrian
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Renzhi Han
- the Department of Cell & Molecular Physiology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153, USA
| | - Liang Qiao
- Department of Microbiology and Immunology, Stritch School of Medicine, Loyola University Chicago, Maywood, IL 60153, USA
| | - Stephanie C Eisenbarth
- Department of Laboratory Medicine, Yale University School of Medicine, New Haven, CT 06520, USA
| | - William M Nauseef
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Veterans Affairs Medical Center, Iowa City, IA 52241, USA
| | - Suzanne L Cassel
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
| | - Fayyaz S Sutterwala
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Immunology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Graduate Program in Molecular and Cellular Biology, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Department of Internal Medicine, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA.,Veterans Affairs Medical Center, Iowa City, IA 52241, USA
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20
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Joly S, Eisenbarth SC, Olivier AK, Williams A, Kaplan DH, Cassel SL, Flavell RA, Sutterwala FS. Cutting edge: Nlrp10 is essential for protective antifungal adaptive immunity against Candida albicans. J Immunol 2012; 189:4713-7. [PMID: 23071280 DOI: 10.4049/jimmunol.1201715] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Nucleotide-binding domain leucine-rich repeat containing receptors (NLRs) are cytosolic receptors that initiate immune responses to sterile and infectious insults to the host. Studies demonstrated that Nlrp3 is critical for the control of Candida albicans infections and in the generation of antifungal Th17 responses. In this article, we show that the NLR family member Nlrp10 also plays a unique role in the control of disseminated C. albicans infection in vivo. Nlrp10-deficient mice had increased susceptibility to disseminated candidiasis, as indicated by decreased survival and increased fungal burdens. In contrast to Nlrp3, Nlrp10 deficiency did not affect innate proinflammatory cytokine production from macrophages and dendritic cells challenged with C. albicans. However, Nlrp10-deficient mice displayed a profound defect in Candida-specific Th1 and Th17 responses. These results demonstrate a novel role for Nlrp10 in the generation of adaptive immune responses to fungal infection.
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Affiliation(s)
- Sophie Joly
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
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21
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Ciraci C, Janczy JR, Sutterwala FS, Cassel SL. Control of innate and adaptive immunity by the inflammasome. Microbes Infect 2012; 14:1263-70. [PMID: 22841804 DOI: 10.1016/j.micinf.2012.07.007] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2012] [Revised: 05/14/2012] [Accepted: 07/02/2012] [Indexed: 02/07/2023]
Abstract
The importance of innate immunity lies not only in directly confronting pathogenic and non-pathogenic insults but also in instructing the development of an efficient adaptive immune response. The Nlrp3 inflammasome provides a platform for the activation of caspase-1 with the subsequent processing and secretion of IL-1 family members. Given the importance of IL-1 in a variety of inflammatory diseases, understanding the role of the Nlrp3 inflammasome in the initiation of innate and adaptive immune responses cannot be overstated. This review examines recent advances in inflammasome biology with an emphasis on its roles in sterile inflammation and triggering of adaptive immune responses.
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Affiliation(s)
- Ceren Ciraci
- Inflammation Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
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22
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Curtiss ML, Gorman JV, Businga TR, Traver G, Singh M, Meyerholz DK, Kline JN, Murphy AJ, Valenzuela DM, Colgan JD, Rothman PB, Cassel SL. Tim-1 regulates Th2 responses in an airway hypersensitivity model. Eur J Immunol 2012; 42:651-61. [PMID: 22144095 DOI: 10.1002/eji.201141581] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
T-cell immunoglobulin mucin-1 (Tim-1) is a transmembrane protein postulated to be a key regulator of Th2-type immune responses. This hypothesis is based in part upon genetic studies associating Tim-1 polymorphisms in mice with a bias toward airway hyperrespon-siveness (AHR) and the development of Th2-type CD4(+) T cells. Tim-1 expressed by Th2 CD4(+) T cells has been proposed to function as a co-stimulatory molecule. Tim-1 is also expressed by B cells, macrophages, and dendritic cells, but its role in responses by these cell types has not been firmly established. Here, we generated Tim-1-deficient mice to determine the role of Tim-1 in a murine model of allergic airway disease that depends on the development and function of Th2 effector cells and results in the generation of AHR. We found antigen-driven recruitment of inflammatory cells into airways is increased in Tim-1-deficient mice relative to WT mice. In addition, we observed increased antigen-specific cytokine production by splenocytes from antigen-sensitized Tim-1-deficient mice relative to those from controls. These data support the conclusion that Tim-1 functions in pathways that suppress recruitment of inflammatory cells into the airways and the generation or activity of CD4(+) T cells.
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Affiliation(s)
- Miranda L Curtiss
- University of Iowa Medical Scientist Training Program, University of Iowa Carver College of Medicine, Iowa City, IA 52242, USA
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23
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Abstract
The NLRP3 inflammasome is activated in response to a variety of signals that are indicative of damage to the host including tissue damage, metabolic stress, and infection. Upon activation, the NLRP3 inflammasome serves as a platform for activation of the cysteine protease caspase-1, which leads to the processing and secretion of the proinflammatory cytokines interleukin-1β (IL-1β) and IL-18. Dysregulated NLRP3 inflammasome activation is associated with both heritable and acquired inflammatory diseases. Here, we review new insights into the mechanism of NLRP3 inflammasome activation and its role in disease pathogenesis.
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Affiliation(s)
- Jaklien C Leemans
- Department of Pathology, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands
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24
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Mostecki J, Cassel SL, Klimecki WT, Stern DA, Knisz J, Iwashita S, Graves P, Miller RL, van Peer M, Halonen M, Martinez FD, Vercelli D, Rothman PB. A SOCS-1 promoter variant is associated with total serum IgE levels. J Immunol 2011; 187:2794-802. [PMID: 21795592 DOI: 10.4049/jimmunol.0902569] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
SOCS-1 is a critical regulator of multiple signaling pathways, including those activated by cytokines that regulate Ig H chain class switching to IgE. Analysis of mice with mutations in the SOCS-1 gene demonstrated that IgE levels increase with loss of SOCS-1 alleles. This suggested that overall SOCS-1 acts as an inhibitor of IgE expression in vivo. A genetic association study was performed in 474 children enrolled in the Tucson Children's Respiratory Study to determine if genetic variation in the SOCS-1 locus correlates with altered levels of IgE. Carriers of the C-allele for a novel, 3' genomic single nucleotide polymorphism (SNP) in the SOCS-1 gene (SOCS1+1125G > C; rs33932899) were found to have significantly lower levels of serum IgE compared with those of homozygotes for the G-allele. Analysis demonstrated that the SOCS1+1125G > C SNP was in complete linkage disequilibrium with an SNP at position SOCS1-820G > T (rs33977706) of the SOCS-1 promoter. Carriers of the T-allele at the SOCS1-820G > T were also found to be associated with the decreased IgE. The promoter SNP increased transcriptional activity of the SOCS-1 promoter in reporter assays and human B cells. Consistent with this observation, the presence of this polymorphism within the promoter abolished binding of yin yang-1, which is identified as a negative regulator of SOCS-1 transcriptional activity. These data suggest that genetic variation in the SOCS-1 promoter may affect IgE production.
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Affiliation(s)
- Justin Mostecki
- Department of Microbiology, Columbia University, New York, NY 10032, USA
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25
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Kashiwada M, Cassel SL, Colgan JD, Rothman PB. NFIL3/E4BP4 controls type 2 T helper cell cytokine expression. EMBO J 2011; 30:2071-82. [PMID: 21499227 DOI: 10.1038/emboj.2011.111] [Citation(s) in RCA: 74] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2010] [Accepted: 03/17/2011] [Indexed: 12/21/2022] Open
Abstract
Type 2 T helper (T(H)2) cells are critical for the development of allergic immune responses; however, the molecular mechanism controlling their effector function is still largely unclear. Here, we report that the transcription factor NFIL3/E4BP4 regulates cytokine production and effector function by T(H)2 cells. NFIL3 is highly expressed in T(H)2 cells but much less in T(H)1 cells. Production of interleukin (IL)-13 and IL-5 is significantly increased in Nfil3(-/-) T(H)2 cells and is decreased by expression of NFIL3 in wild-type T(H)2 cells. NFIL3 directly binds to and negatively regulates the Il13 gene. In contrast, IL-4 production is decreased in Nfil3(-/-) T(H)2 cells. Increased IL-13 and IL-5 together with decreased IL-4 production by antigen-stimulated splenocytes from the immunized Nfil3(-/-) mice was also observed. The ability of NFIL3 to alter T(H)2 cytokine production is a T-cell intrinsic effect. Taken together, these data indicate that NFIL3 is a key regulator of T(H)2 responses.
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Affiliation(s)
- Masaki Kashiwada
- Department of Internal Medicine, University of Iowa, Iowa City, IA, USA
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26
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Abstract
The nucleotide-binding domain leucine-rich repeat containing (NLR) family of receptors are members of the innate immune system, and have a critical role in host defense. These molecules are key to driving inflammatory responses to abnormal cellular conditions. Many NLRs serve this role on activation by forming a multiprotein complex called an inflammasome. The inflammasome drives the processing and release of cytokines, such as the proinflammatory cytokines interleukin (IL)-1β and IL-18. Recently, the important function of NLR molecules in autoinflammatory disorders has been recognized, in part through the identification of the role of IL-1β in the pathogenesis of several autoinflammatory diseases. Cryopyrin-associated periodic syndromes were the first autoinflammatory disorders found to be directly mediated by dysfunctional inflammasome activation. This finding has subsequently led to studies in both murine models and humans that have revealed several other inflammatory conditions associated with activation of NLR-containing inflammasomes. Understanding the molecular pathophysiology of these autoinflammatory disorders has further guided the successful development of targeted therapy against IL-1. In this review, we provide an overview of the inflammasomes and describe the important role they play in the development and manifestation of autoinflammatory diseases.
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Affiliation(s)
- Shruti P Wilson
- Division of Allergy and Immunology, Department of Internal Medicine, University of Iowa Hospitals and Clinics, 200 Hawkins Drive, Iowa City, IA 52242, USA
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27
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Abstract
Through pattern recognition receptors the innate immune system detects disruption of the normal function of the organism and initiates responses directed at correcting these derangements. Cellular damage from microbial or non-microbial insults causes the activation of nucleotide-binding domain leucine-rich repeat containing receptors in multiprotein complexes called inflammasomes. Here we discuss the role of the NLRP3 inflammasome in the recognition of cellular damage and the initiation of sterile inflammatory responses.
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Affiliation(s)
- Suzanne L Cassel
- Division of Allergy and Immunology, Department of Internal Medicine, University of Iowa, Iowa City, IA, USA.
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28
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Joly S, Ma N, Sadler JJ, Soll DR, Cassel SL, Sutterwala FS. Cutting edge: Candida albicans hyphae formation triggers activation of the Nlrp3 inflammasome. J Immunol 2009; 183:3578-81. [PMID: 19684085 DOI: 10.4049/jimmunol.0901323] [Citation(s) in RCA: 225] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The proinflammatory cytokine IL-1beta plays an important role in antifungal immunity; however, the mechanisms by which fungal pathogens trigger IL-1beta secretion are unclear. In this study we show that infection with Candida albicans is sensed by the Nlrp3 inflammasome, resulting in the subsequent release of IL-1beta. The ability of C. albicans to switch from a unicellular yeast form into a filamentous form is essential for activation of the Nlrp3 inflammasome, as C. albicans mutants incapable of forming hyphae were defective in their ability to induce macrophage IL- 1beta secretion. Nlrp3-deficient mice also demonstrated increased susceptibility to infection with C. albicans, which is consistent with a key role for Nlrp3 in innate immune responses to the pathogen C. albicans.
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Affiliation(s)
- Sophie Joly
- Division of Infectious Diseases, University of Iowa, Iowa City, IA 52242, USA
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29
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Abstract
The innate immune system senses danger signals via evolutionary conserved receptors. The nucleotide-binding domain leucine-rich repeat containing receptor (NLR) family is a group of intracellular receptors that drive a wide variety of inflammatory responses. A number of the NLR family members can form inflammasomes, which are multiprotein complexes that can activate caspase-1 and ultimately lead to the processing and secretion of interleukin (IL)-1beta, IL-18 and IL-33. One of the best-studied members of the NLR family is NLRP3 for which a number of divergent activators have recently been described. These and other studies examining the NLRP3 inflammasome will be discussed in this review.
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Affiliation(s)
- Suzanne L Cassel
- Division of Allergy and Immunology, Department of Internal Medicine, University of Iowa, Iowa City, IA 52242, USA.
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30
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Pedra JHF, Cassel SL, Sutterwala FS. Sensing pathogens and danger signals by the inflammasome. Curr Opin Immunol 2009; 21:10-6. [PMID: 19223160 DOI: 10.1016/j.coi.2009.01.006] [Citation(s) in RCA: 175] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2008] [Accepted: 01/20/2009] [Indexed: 02/07/2023]
Abstract
The NLR (nucleotide-binding domain leucine-rich repeat containing) family of intracellular sensors is a crucial component of the innate immune system. A number of NLR family members can form multiprotein complexes, called inflammasomes, and are capable of activating the cysteine protease caspase-1 in response to a wide range of stimuli including both microbial and self-molecules. Caspase-1 activation leads to processing and secretion of the proinflammatory cytokines interleukin-1beta (IL-1beta) and IL-18, which play crucial roles in host defense to infectious insults. Dysregulation of the inflammasome has also been linked to a number of autoinflammatory and autoimmune disorders. Recent advances in the inflammasome field will be discussed in this review.
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Affiliation(s)
- Joao H F Pedra
- Institute for Integrative Genome Biology and Department of Entomology, University of California-Riverside, 92521, USA.
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31
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Abstract
The astonishing density of microbes in the mammalian gut has raised numerous questions, including how such colonization is tolerated in an immunocompetent location. Clearly the organisms perform a beneficial role, but until now the mechanisms have been less than clear. In a recent study in Nature, Mazmanian et al. (2008) reveal the ability of specific moieties on the surface of Bacteroides fragilis to direct the host's immune response.
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Affiliation(s)
- Suzanne L Cassel
- Division of Allergy and Immunology, University of Iowa, Iowa City, IA 52242, USA.
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32
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Landers JE, Cassel SL, George DL. Translational enhancement of mdm2 oncogene expression in human tumor cells containing a stabilized wild-type p53 protein. Cancer Res 1997; 57:3562-8. [PMID: 9270029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The mdm2 oncogene has transforming potential that is activated by overexpression. We previously reported the identification of human choriocarcinoma cell lines that have very high levels of mdm2 proteins as well as elevated levels of a stabilized wild-type p53 protein. Importantly, this mdm2 overexpression resulted from enhanced translation of mdm2 mRNA, a mechanism that had not previously been implicated in mdm2 expression control. The focus of this study was to investigate the breadth of enhanced translation of mdm2 mRNA in human cancers and to elucidate the basis for this translational activation. Here we present evidence that translational enhancement of mdm2 expression occurs in a variety of human tumor cells. Most of these samples also have high levels of wild-type p53 protein. However, there is no evidence for concomitant overexpression of the p53 target genes p21/waf1 and gadd45. Additionally, we demonstrate that the translational enhancement of mdm2 involves a preferential increase in mdm2 transcription that is initiated from the internal p53-responsive promoter region of this gene. The particular mdm2 transcripts that are generated contain a distinct 5' untranslated region and exhibit a significantly enhanced translational efficiency. These data provide a quantitative explanation for the overexpression of mdm2 proteins in this class of human tumors.
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Affiliation(s)
- J E Landers
- Department of Genetics, University of Pennsylvania School of Medicine, Philadelphia 19104-6069, USA
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