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Lu J, Meng J, Wu G, Wei W, Xie H, Liu Y. Th1 cells reduce the osteoblast-like phenotype in valvular interstitial cells by inhibiting NLRP3 inflammasome activation in macrophages. Mol Med 2024; 30:110. [PMID: 39080527 PMCID: PMC11287975 DOI: 10.1186/s10020-024-00882-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Accepted: 07/17/2024] [Indexed: 08/03/2024] Open
Abstract
BACKGROUND AND AIMS Inflammation is initiates the propagation phase of aortic valve calcification. The activation of NLRP3 signaling in macrophages plays a crucial role in the progression of calcific aortic valve stenosis (CAVS). IFN-γ regulates NLRP3 activity in macrophages. This study aimed to explore the mechanism of IFN-γ regulation and its impact on CAVS progression and valve interstitial cell transdifferentiation. METHODS AND RESULTS The number of Th1 cells and the expression of IFN-γ and STAT1 in the aortic valve, spleen and peripheral blood increased significantly as CAVS progressed. To explore the mechanisms underlying the roles of Th1 cells and IFN-γ, we treated CAVS mice with IFN-γ-AAV9 or an anti-IFN-γ neutralizing antibody. While IFN-γ promoted aortic valve calcification and dysfunction, it significantly decreased NLRP3 signaling in splenic macrophages and Ly6C+ monocytes. In vitro coculture showed that Th1 cells inhibited NLPR3 activation in ox-LDL-treated macrophages through the IFN-γR1/IFN-γR2-STAT1 pathway. Compared with untreated medium, conditioned medium from Th1-treated bone marrow-derived macrophages reduced the osteogenic calcification of valvular interstitial cells. CONCLUSION Inhibition of the NLRP3 inflammasome by Th1 cells protects against valvular interstitial cell calcification as a negative feedback mechanism of adaptive immunity toward innate immunity. This study provides a precision medicine strategy for CAVS based on the targeting of anti-inflammatory mechanisms.
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Affiliation(s)
- Jing Lu
- The First Clinical Medical College, Guangxi Medical University, Guangxi Zhuang Autonomous Region, Shuangyong Road 22, Nanning, 530021, P.R. China
| | - Jiaming Meng
- Department of Cardiology, Liuzhou People's Hospital, Guangxi, Zhuang Autonomous Region, Wenchang Road 8, Liuzhou, 545000, P.R. China
| | - Gang Wu
- Department of Cardiology, Liuzhou People's Hospital, Guangxi, Zhuang Autonomous Region, Wenchang Road 8, Liuzhou, 545000, P.R. China
| | - Wulong Wei
- Department of Cardiology, Liuzhou People's Hospital, Guangxi, Zhuang Autonomous Region, Wenchang Road 8, Liuzhou, 545000, P.R. China
| | - Huabao Xie
- The First Clinical Medical College, Guangxi Medical University, Guangxi Zhuang Autonomous Region, Shuangyong Road 22, Nanning, 530021, P.R. China.
| | - Yanli Liu
- Department of Cardiology, Liuzhou People's Hospital, Guangxi, Zhuang Autonomous Region, Wenchang Road 8, Liuzhou, 545000, P.R. China.
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2
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Ding H, Wang G, Yu Z, Sun H, Wang L. Role of interferon-gamma (IFN-γ) and IFN-γ receptor 1/2 (IFNγR1/2) in regulation of immunity, infection, and cancer development: IFN-γ-dependent or independent pathway. Biomed Pharmacother 2022; 155:113683. [PMID: 36095965 DOI: 10.1016/j.biopha.2022.113683] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Revised: 08/27/2022] [Accepted: 09/07/2022] [Indexed: 11/02/2022] Open
Abstract
IFN-γ, a soluble cytokine being produced by T lymphocytes, macrophages, mucosal epithelial cells, or natural killer cells, is able to bind to the IFN-γ receptor (IFNγR) and in turn activate the Janus kinase (JAK)-signal transducer and transcription protein (STAT) pathway and induce expression of IFN-γ-stimulated genes. IFN-γ is critical for innate and adaptive immunity and aberrant IFN-γ expression and functions have been associated with different human diseases. However, the IFN-γ/IFNγR signaling could be a double-edged sword in cancer development because the tissue microenvironments could determine its anti- or pro-tumorigenic activities. The IFNγR protein consists of two IFNγR1 and IFNγR2 chains, subunits of which play different roles under certain conditions. This review assessed IFNγR polymorphisms, expression and functions in development and progression of various human diseases in an IFN-γ-dependent or independent manner. This review also discussed tumor microenvironment, microbial infection, and vital molecules in the IFN-γ upstream signaling that might regulate IFNγR expression, drug resistance, and druggable strategy, to provide evidence for further application of IFNγR.
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Affiliation(s)
- Huihui Ding
- School of Pharmacy, Shandong First Medical University, Jinan, Shandong, China.
| | - Gongfu Wang
- Center for Drug Evaluation, China Food and Drug Administration (CFDA), Beijing, China.
| | - Zhen Yu
- Department of Pharmacy, Central Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.
| | - Huimin Sun
- School of Pharmacy, Shandong First Medical University, Jinan, Shandong, China.
| | - Lu Wang
- School of Pharmacy, Shandong First Medical University, Jinan, Shandong, China; Department of Pharmacy, Central Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, China.
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3
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You D, Qiao Q, Ono K, Wei M, Tan W, Wang C, Liu Y, Liu G, Zheng M. miR-223-3p inhibits the progression of atherosclerosis via down-regulating the activation of MEK1/ERK1/2 in macrophages. Aging (Albany NY) 2022; 14:1865-1878. [PMID: 35202001 PMCID: PMC8908932 DOI: 10.18632/aging.203908] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 01/11/2022] [Indexed: 06/07/2023]
Abstract
BACKGROUND microRNAs (miRNAs) have drawn more attention to the progression of atherosclerosis (AS), due to their noticeable inflammation function in cardiovascular disease. Macrophages play a crucial role in disrupting atherosclerotic plaque, thereby we explored the involvement of miR-223-3p in the inflammatory response in macrophages. METHODS RT-qPCR was used to analyze the miR-223-3p levels in carotid arteries and serum of AS patients. ROC curve was used to assess the diagnostic value of miR-223-3p. Movat staining was applied to evaluate the morphological differences. FISH was used to identify the expression of miR-223-3p in macrophages of atherosclerotic lesions. Bioinformatic analysis was performed. Double-immunofluorescence and western blot were performed to assess the inflammatory cytokine secretion and p-ERK1/2. C16-PAF was injected into the culture medium of the miR-223-3p mimic/NC-transfected macrophages with ox-LDL. RESULTS MiR-223-3p was up-regulated in AS patients and was associated with a higher overall survival rate. MiR-223-3p was co-localized with CD68+ macrophages in vulnerable atherosclerotic lesions. MiR-223-3p mimics decreased atherosclerotic lesions, macrophages numbers whereas increased SMCs numbers in the lesions. The TNF-a immune-positive areas were reduced by miR-223-3p mimics. MAP2K1 was negatively associated with miR-223-3p. MiR-223-3p mimics reduced the inflammation and the MEK1/ERK1/2 signaling pathway in vivo and in vitro. C16-PAF reversed the effects of miR-223-3p mimics on inflammation and ERK1/2 signaling pathway. CONCLUSIONS MiR-223-3p negatively regulates inflammatory responses by the MEK1/ERK1/2 signaling pathway. Our study provides new insight into how miR-223-3p protects against atherosclerosis, representing a broader therapeutic prospect for treating atherosclerosis by miR-223-3p.
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Affiliation(s)
- Daofeng You
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Qiuge Qiao
- Hebei Medical University Second Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Katsushige Ono
- Department of Pathophysiology, Oita University School of Medicine, Hasama, Yufu, Ōita-shi, Japan
| | - Mei Wei
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Wenyun Tan
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Cuihua Wang
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Yangong Liu
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Gang Liu
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
| | - Mingqi Zheng
- Hebei Medical University First Affiliated Hospital, Shijiazhuang 050023, Hebei, China
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4
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Kim JY, Choi GE, Yoo HJ, Kim HS. Interferon Potentiates Toll-Like Receptor-Induced Prostaglandin D 2 Production through Positive Feedback Regulation between Signal Transducer and Activators of Transcription 1 and Reactive Oxygen Species. Front Immunol 2017; 8:1720. [PMID: 29255467 PMCID: PMC5723016 DOI: 10.3389/fimmu.2017.01720] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2017] [Accepted: 11/21/2017] [Indexed: 01/14/2023] Open
Abstract
Prostaglandin D2 (PGD2) is a potent lipid mediator that controls inflammation, and its dysregulation has been implicated in diverse inflammatory disorders. Despite significant progress made in understanding the role of PGD2 as a key regulator of immune responses, the molecular mechanism underlying PGD2 production remains unclear, particularly upon challenge with different and multiple inflammatory stimuli. Interferons (IFNs) potentiate macrophage activation and act in concert with exogenous inflammatory mediators such as toll-like receptor (TLR) ligands to amplify inflammatory responses. A recent study found that IFN-γ enhanced lipopolysaccharide-induced PGD2 production, indicating a role of IFNs in PGD2 regulation. Here, we demonstrate that TLR-induced PGD2 production by macrophages was significantly potentiated by signaling common to IFN-β and IFN-γ in a signal transducer and activators of transcription (STAT)1-dependent mechanism. Such potentiation by IFNs was also observed for PGE2 production, despite the differential regulation of PGD synthase and PGE synthase isoforms mediating PGD2 and PGE2 production under inflammatory conditions. Mechanistic analysis revealed that the generation of intracellular reactive oxygen species (ROS) was remarkably potentiated by IFNs and required for PGD2 production, but was nullified by STAT1 deficiency. Conversely, the regulation of STAT1 level and activity by IFNs was largely dependent on ROS levels. Using a model of zymosan-induced peritonitis, the relevance of this finding in vivo was supported by marked inhibition of PGD2 and ROS produced in peritoneal exudate cells by STAT1 deficiency. Collectively, our findings suggest that IFNs, although not activating on their own, are potent amplifiers of TLR-induced PGD2 production via positive-feedback regulation between STAT1 and ROS.
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Affiliation(s)
- Ji-Yun Kim
- Department of Biomedical Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Go-Eun Choi
- Department of Biomedical Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.,Institute of Convergence Bio-Health, Dong-A University, Busan, South Korea
| | - Hyun Ju Yoo
- Biomedical Research Center, Department of Convergence Medicine, Asan Institute of Life Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Hun Sik Kim
- Department of Biomedical Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.,Department of Microbiology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea.,Cellular Dysfunction Research Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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5
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Adaptive Upregulation of Clumping Factor A (ClfA) by Staphylococcus aureus in the Obese, Type 2 Diabetic Host Mediates Increased Virulence. Infect Immun 2017; 85:IAI.01005-16. [PMID: 28320836 DOI: 10.1128/iai.01005-16] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2016] [Accepted: 03/09/2017] [Indexed: 01/28/2023] Open
Abstract
Obesity and associated type 2 diabetes (T2D) are important risk factors for infection following orthopedic implant surgery. Staphylococcus aureus, the most common pathogen in bone infections, adapts to multiple environments to survive and evade host immune responses. Whether adaptation of S. aureus to the unique environment of the obese/T2D host accounts for its increased virulence and persistence in this population is unknown. Thus, we assessed implant-associated osteomyelitis in normal versus high-fat-diet obese/T2D mice and found that S. aureus infection was more severe, including increases in bone abscesses relative to nondiabetic controls. S. aureus isolated from bone of obese/T2D mice displayed marked upregulation of four adhesion genes (clfA, clfB, bbp, and sdrC), all with binding affinity for fibrin(ogen). Immunostaining of infected bone revealed increased fibrin deposition surrounding bacterial abscesses in obese/T2D mice. In vitro coagulation assays demonstrated a hypercoagulable state in obese/T2D mice that was comparable to that of diabetic patients. S. aureus with an inactivating mutation in clumping factor A (clfA) showed a reduction in bone infection severity that eliminated the effect of obesity/T2D, while infections in control mice were unchanged. In infected mice that overexpress plasminogen activator inhibitor-1 (PAI-1), S. aureusclfA expression and fibrin-encapsulated abscess communities in bone were also increased, further linking fibrin deposition to S. aureus expression of clfA and infection severity. Together, these results demonstrate an adaptation by S. aureus to obesity/T2D with increased expression of clfA that is associated with the hypercoagulable state of the host and increased virulence of S. aureus.
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6
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Kim HS, Kim DC, Kim HM, Kwon HJ, Kwon SJ, Kang SJ, Kim SC, Choi GE. STAT1 deficiency redirects IFN signalling toward suppression of TLR response through a feedback activation of STAT3. Sci Rep 2015; 5:13414. [PMID: 26299368 PMCID: PMC4547106 DOI: 10.1038/srep13414] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Accepted: 07/27/2015] [Indexed: 01/14/2023] Open
Abstract
Interferons (IFNs) potentiate macrophage activation typically via a STAT1-dependent pathway. Recent studies suggest a functioning of STAT1-independent pathway in the regulation of gene expression by IFN-γ, thus pointing to the diversity in cellular responses to IFNs. Many functions of IFNs rely on cross-regulation of the responses to exogenous inflammatory mediators such as TLR ligands. Here we investigated the contribution of STAT1-independent pathway to macrophage activation and its underlying mechanism in the context of combined stimulation of IFN and TLR. We found that TLR-induced production of inflammatory cytokines (TNF-α, IL-12) was not simply nullified but was significantly suppressed by signaling common to IFN-γ and IFN-β in STAT1-null macrophages. Such a shift in the suppression of TLR response correlated with a sustained STAT3 activation and attenuation of NF-κB signaling. Using a JAK2/STAT3 pathway inhibitor or STAT3-specific siRNA, blocking STAT3 in that context restored TNF-α production and NF-κB signaling, thus indicating a functional cross-regulation among STAT1, STAT3, and NF-κB. Our results suggest that STAT1 deficiency reprograms IFN signaling from priming toward suppression of TLR response via feedback regulation of STAT3, which may provide a new insight into the host defense response against microbial pathogens in a situation of STAT1 deficiency.
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Affiliation(s)
- Hun Sik Kim
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea.,Cellular Dysfunction Research Center, University of Ulsan College of Medicine, Seoul 138-736, Korea.,Department of Microbiology, University of Ulsan College of Medicine, Seoul 138-736, Korea
| | - Dong Chan Kim
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea
| | - Hong-Mi Kim
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea
| | - Hyung-Joon Kwon
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea.,Cellular Dysfunction Research Center, University of Ulsan College of Medicine, Seoul 138-736, Korea
| | - Soon Jae Kwon
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea
| | - Suk-Jo Kang
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Sun Chang Kim
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Korea
| | - Go-Eun Choi
- Department of Biomedical Sciences, University of Ulsan College of Medicine, Seoul 138-736, Korea.,Cellular Dysfunction Research Center, University of Ulsan College of Medicine, Seoul 138-736, Korea
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7
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A humoral immune defect distinguishes the response to Staphylococcus aureus infections in mice with obesity and type 2 diabetes from that in mice with type 1 diabetes. Infect Immun 2015; 83:2264-74. [PMID: 25802056 DOI: 10.1128/iai.03074-14] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2014] [Accepted: 03/15/2015] [Indexed: 02/08/2023] Open
Abstract
Obesity and diabetes are among the greatest risk factors for infection following total joint arthroplasty. However, the underlying mechanism of susceptibility is unclear. We compared orthopedic implant-associated Staphylococcus aureus infections in type 1 (T1D) versus type 2 (T2D) diabetic mouse models and in patients with S. aureus infections, focusing on the adaptive immune response. Mice were fed a high-fat diet to initiate obesity and T2D. T1D was initiated with streptozotocin. Mice were then given a trans-tibial implant that was precoated with bioluminescent Xen36 S. aureus. Although both mouse models of diabetes demonstrated worse infection severity than controls, infection in T2D mice was more severe, as indicated by increases in bioluminescence, S. aureus CFU in tissue, and death within the first 7 days. Furthermore, T2D mice had an impaired humoral immune response at day 14 with reduced total IgG, decreased S. aureus-specific IgG, and increased IgM. These changes were not present in T1D mice. Similarly, T2D patients and obese nondiabetics with active S. aureus infections had a blunted IgG response to S. aureus. In conclusion, we report the first evidence of a humoral immune deficit, possibly due to an immunoglobulin class switch defect, in obesity and T2D during exacerbated S. aureus infection which may contribute to the increased infection risk following arthroplasty in patients with T2D and obesity.
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8
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Poo YS, Rudd PA, Gardner J, Wilson JAC, Larcher T, Colle MA, Le TT, Nakaya HI, Warrilow D, Allcock R, Bielefeldt-Ohmann H, Schroder WA, Khromykh AA, Lopez JA, Suhrbier A. Multiple immune factors are involved in controlling acute and chronic chikungunya virus infection. PLoS Negl Trop Dis 2014; 8:e3354. [PMID: 25474568 PMCID: PMC4256279 DOI: 10.1371/journal.pntd.0003354] [Citation(s) in RCA: 117] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Accepted: 10/15/2014] [Indexed: 12/18/2022] Open
Abstract
The recent epidemic of the arthritogenic alphavirus, chikungunya virus (CHIKV) has prompted a quest to understand the correlates of protection against virus and disease in order to inform development of new interventions. Herein we highlight the propensity of CHIKV infections to persist long term, both as persistent, steady-state, viraemias in multiple B cell deficient mouse strains, and as persistent RNA (including negative-strand RNA) in wild-type mice. The knockout mouse studies provided evidence for a role for T cells (but not NK cells) in viraemia suppression, and confirmed the role of T cells in arthritis promotion, with vaccine-induced T cells also shown to be arthritogenic in the absence of antibody responses. However, MHC class II-restricted T cells were not required for production of anti-viral IgG2c responses post CHIKV infection. The anti-viral cytokines, TNF and IFNγ, were persistently elevated in persistently infected B and T cell deficient mice, with adoptive transfer of anti-CHIKV antibodies unable to clear permanently the viraemia from these, or B cell deficient, mice. The NOD background increased viraemia and promoted arthritis, with B, T and NK deficient NOD mice showing high-levels of persistent viraemia and ultimately succumbing to encephalitic disease. In wild-type mice persistent CHIKV RNA and negative strand RNA (detected for up to 100 days post infection) was associated with persistence of cellular infiltrates, CHIKV antigen and stimulation of IFNα/β and T cell responses. These studies highlight that, secondary to antibodies, several factors are involved in virus control, and suggest that chronic arthritic disease is a consequence of persistent, replicating and transcriptionally active CHIKV RNA. The largest epidemic ever recorded for chikungunya virus (CHIKV) started in 2004 in Africa, then spread across Asia and recently caused tens of thousands of cases in Papua New Guinea and the Caribbean. This mosquito-borne alphavirus primarily causes an often debilitating, acute and chronic polyarthritis/polyarthalgia. Despite robust anti-viral immune responses CHIKV is able to persist, with such persistence poorly understood and the likely cause of chronic disease. Herein we highlight the propensity of CHIKV to persist long term, both as a persistent viraemia in different B cell deficient mouse strains, but also as persistent viral RNA in wild-type mice. These studies suggest that, aside from antibodies, other immune factors, such as CD4 T cells and TNF, are active in viraemia control. The work also supports the notion that CHIKV disease, with the exception of encephalitis, is largely an immunopathology. Persistent CHIKV RNA in wild-type mice continues to stimulate type I interferon and T cell responses, with this model of chronic disease recapitulating many of the features seen in chronic CHIKV patients.
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Affiliation(s)
- Yee Suan Poo
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
- School of Medicine/School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Penny A. Rudd
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
- School of Medicine/School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Joy Gardner
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
| | - Jane A. C. Wilson
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
- School of Medicine/School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - Thibaut Larcher
- Institut National de Recherche Agronomique, Unité Mixte de Recherche 703, Oniris, Nantes, France
| | - Marie-Anne Colle
- Institut National de Recherche Agronomique, Unité Mixte de Recherche 703, Oniris, Nantes, France
| | - Thuy T. Le
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
| | - Helder I. Nakaya
- School of Pharmaceutical Sciences, University of São Paulo, São Paulo, Brazil
| | - David Warrilow
- Public Health Virology Laboratory, Department of Health, Queensland Government, Brisbane, Queensland, Australia
| | - Richard Allcock
- Lotterywest State Biomedical Facility Genomics, Royal Perth Hospital, Perth, Western Australia, Australia
| | | | - Wayne A. Schroder
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
| | - Alexander A. Khromykh
- School of Medicine/School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland, Australia
| | - José A. Lopez
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
- School of Natural Sciences, Griffith University, Nathan, Australia
| | - Andreas Suhrbier
- QIMR Berghofer Medical Research Institute, and the Australian Infectious Diseases Research Centre, Brisbane, Queensland, Australia
- School of Medicine/School of Molecular and Microbial Sciences, University of Queensland, Brisbane, Queensland, Australia
- School of Natural Sciences, Griffith University, Nathan, Australia
- * E-mail:
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9
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Altered immune regulation in type 1 diabetes. Clin Dev Immunol 2013; 2013:254874. [PMID: 24285974 PMCID: PMC3763577 DOI: 10.1155/2013/254874] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2013] [Revised: 06/19/2013] [Accepted: 07/04/2013] [Indexed: 02/05/2023]
Abstract
Research in genetics and immunology was going on separate strands for a long time. Type 1 diabetes mellitus might not be characterized with a single pathogenetic factor. It develops when a susceptible individual is exposed to potential triggers in a given sequence and timeframe that eventually disarranges the fine-tuned immune mechanisms that keep autoimmunity under control in health. Genomewide association studies have helped to understand the congenital susceptibility, and hand-in-hand with the immunological research novel paths of immune dysregulation were described in central tolerance, apoptotic pathways, or peripheral tolerance mediated by regulatory T-cells. Epigenetic factors are contributing to the immune dysregulation. The interplay between genetic susceptibility and potential triggers is likely to play a role at a very early age and gradually results in the loss of balanced autotolerance and subsequently in the development of the clinical disease. Genetic susceptibility, the impaired elimination of apoptotic β-cell remnants, altered immune regulatory functions, and environmental factors such as viral infections determine the outcome. Autoreactivity might exist under physiologic conditions and when the integrity of the complex regulatory process is damaged the disease might develop. We summarized the immune regulatory mechanisms that might have a crucial role in disease pathology and development.
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10
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Misharin AV, Haines GK, Rose S, Gierut AK, Hotchkiss RS, Perlman H. Development of a new humanized mouse model to study acute inflammatory arthritis. J Transl Med 2012; 10:190. [PMID: 22974474 PMCID: PMC3480927 DOI: 10.1186/1479-5876-10-190] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2012] [Accepted: 09/10/2012] [Indexed: 01/27/2023] Open
Abstract
BACKGROUND Substantial advances have been generated in understanding the pathogenesis of rheumatoid arthritis (RA). Current murine models of RA-like disease have provided great insights into the molecular mechanism of inflammatory arthritis due to the use of genetically deficient or transgenic mice. However, these studies are limited by differences that exist between human and murine immune systems. Thus, the development of an animal model that utilizes human immune cells, will afford the opportunity to study their function in the initiation and propagation of inflammatory arthritis. METHODS One to two-day old irradiated NOD-scid IL2rγ(null) (NSG) mice were reconstituted with human CD34+ cord blood stem cells. Leukocytes were analyzed by flow cytometry and circulating antibodies were determined by ELISA. Arthritis was induced by injecting complete Freund's adjuvant into knee or ankle joints. Mice were also treated with the TNF inhibitor, Etanercept, or PBS and joints were analyzed histologically. RESULTS Humanized mice were established with high reconstitution rates and were able to spontaneously produce human immunoglobulins as well as specific IgG in response to immunization. Intraperitoneal injection of thioglycolate or injection of complete Freund's adjuvant into joints resulted in migration of human immune cells to the injected sites. Arthritic humanized mice treated with Etanercept had markedly less inflammation, which was associated with decreased total numbers of human CD45+ cells, including human lymphocytes and neutrophils. CONCLUSIONS The humanized mouse model is a new model to study inflammatory arthritis disease using human leukocytes without rejection of engrafted tissue. Future studies may adapt this system to incorporate RA patient cord blood and develop a chimeric animal model of inflammatory arthritis using genetically predisposed immune cells.
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Affiliation(s)
- Alexander V Misharin
- Department of Medicine/Rheumatology, Northwestern University, Feinberg School of Medicine, 240 East Huron Street, Room Chicago, IL 60611, USA
| | - G Kenneth Haines
- Department of Pathology, Yale University, School of Medicine, New Haven, CT 06510, USA
| | - Shawn Rose
- Department of Medicine/Rheumatology, Northwestern University, Feinberg School of Medicine, 240 East Huron Street, Room Chicago, IL 60611, USA
| | - Angelical K Gierut
- Department of Medicine/Rheumatology, Northwestern University, Feinberg School of Medicine, 240 East Huron Street, Room Chicago, IL 60611, USA
| | - Richard S Hotchkiss
- Department of Anesthesiology, Washington University School of Medicine, St Louis, MO 63110, USA
| | - Harris Perlman
- Department of Medicine/Rheumatology, Northwestern University, Feinberg School of Medicine, 240 East Huron Street, Room Chicago, IL 60611, USA
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11
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A defect in cell death of macrophages is a conserved feature of nonobese diabetic mouse. Biochem Biophys Res Commun 2012; 421:145-51. [PMID: 22510411 DOI: 10.1016/j.bbrc.2012.04.017] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Accepted: 04/03/2012] [Indexed: 01/04/2023]
Abstract
Impaired apoptosis in immune effector cells such as macrophages has been implicated in the development of autoimmune disease by promoting the breakdown of self-tolerance and the sustained production of cytotoxic molecules. Macrophages from nonobese diabetic (NOD) mouse, an animal model of human autoimmune diabetes, exhibit several defects that are causally linked to the onset and progression of the disease. In this context, we investigated whether NOD macrophages have a defect in a cell death pathway, and if that is the case, the mechanism underlying such dysregulation of cell death. We found that NOD macrophages were resistant to treatment with a broad spectrum of cell death stimuli, triggering both apoptotic and non-apoptotic death. Through analysis of intracellular signaling pathways along with the expression of apoptosis-related proteins, we found that atypical resistance to cell death was associated with an elevated expression of anti-apoptotic Bcl-X(L) but not the NF-κB signaling pathway in NOD macrophages. Further, ABT-737, which can inhibit Bcl-X(L) function, sensitized NOD macrophages to apoptosis induced by diverse apoptotic stimuli, thus restoring sensitivity to cell death. Taken together, our results suggest a macrophage-intrinsic defect in cell death as a potential mechanism that promotes an immune attack towards pancreatic β-cells and the development of autoimmune diabetes in NOD mice.
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