1
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Bautista-Bautista G, Salguero-Zacarias S, Villeda-Gabriel G, García-López G, Osorio-Caballero M, Palafox-Vargas ML, Acuña-González RJ, Lara-Pereyra I, Díaz-Ruíz O, Flores-Herrera H. Escherichia coli induced matrix metalloproteinase-9 activity and type IV collagen degradation is regulated by progesterone in human maternal decidual. BMC Pregnancy Childbirth 2024; 24:645. [PMID: 39367340 PMCID: PMC11451097 DOI: 10.1186/s12884-024-06847-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2024] [Accepted: 09/20/2024] [Indexed: 10/06/2024] Open
Abstract
BACKGROUND Escherichia coli (E. coli) is one of the main bacteria associated with preterm premature rupture of membranes by increasing pro-matrix metalloproteinase 9 (proMMP-9) and degradation of type IV collagen in human feto-maternal interface (HFMi). proMMP-9 is regulated by progesterone (P4) but it is unclear whether P4 inhibits proMMP in human maternal decidual (MDec). This study aimed to determine a role of P4 on proMMP-2 and - 9 and type IV collagen induced by E. coli infection in MDec. METHODS Nine HFMi were mounted in a Transwell system. MDec was stimulated with P4 or E. coli for 3-, 6-, or 24-hours. proMMP-2, -9 and type IV collagen were assessed. RESULTS Gelatin zymography revealed an increase in proMMP-9 after 3, 6, and 24 h of stimulating MDec with E. coli. Using immunofluorescence, it was confirmed the increase in the HFMi tissue and a reduction on the amount of type IV collagen leading to the separation of fetal amniochorion and MDEc. The degradative activity of proMMP-9 was reduced by 20% by coincubation with P4. CONCLUSIONS P4 modulates the activity of proMMP-9 induced by E. coli stimulation but it was unable to completely reverse the degradation of type IV collagen in human MDec tissue.
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Affiliation(s)
- Gerardo Bautista-Bautista
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Urales #800 Col. Lomas de Virreyes CP 11000, Tercer piso de la Torre de Investigación, Ciudad de México, México
| | - Santos Salguero-Zacarias
- Departamento de Tococirugia y Urgencias, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Ciudad de México, México
| | - Graciela Villeda-Gabriel
- Departamento de Inmunología e infectología, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Ciudad de México, México
| | - Guadalupe García-López
- Departamento de Fisiología y Desarrollo Celular, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes , Ciudad de México, México
| | - Mauricio Osorio-Caballero
- Departamento de Salud Sexual y Reproductiva, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Ciudad de México, México
| | - Martha Leticia Palafox-Vargas
- Departamento de Anatomía Patológica, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Ciudad de México, México
| | - Ricardo Josué Acuña-González
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Urales #800 Col. Lomas de Virreyes CP 11000, Tercer piso de la Torre de Investigación, Ciudad de México, México
| | - Irlando Lara-Pereyra
- Departamento de Ginecología, Hospital General de Zona 252, Instituto Mexicano del Seguro Social, Atlacomulco, México
| | - Oscar Díaz-Ruíz
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
| | - Hector Flores-Herrera
- Departamento de Inmunobioquímica, Instituto Nacional de Perinatología Isidro Espinosa de los Reyes, Urales #800 Col. Lomas de Virreyes CP 11000, Tercer piso de la Torre de Investigación, Ciudad de México, México.
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Wadowska M, Dobosz E, Golda A, Bryzek D, Lech M, Fu M, Koziel J. MCP-Induced Protein 1 Participates in Macrophage-Dependent Endotoxin Tolerance. THE JOURNAL OF IMMUNOLOGY 2022; 209:1348-1358. [DOI: 10.4049/jimmunol.2101184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 07/28/2022] [Indexed: 11/06/2022]
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Zhu JJ, Stenfeldt C, Bishop EA, Canter JA, Eschbaumer M, Rodriguez LL, Arzt J. Inferred Causal Mechanisms of Persistent FMDV Infection in Cattle from Differential Gene Expression in the Nasopharyngeal Mucosa. Pathogens 2022; 11:pathogens11080822. [PMID: 35894045 PMCID: PMC9329776 DOI: 10.3390/pathogens11080822] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Revised: 07/14/2022] [Accepted: 07/18/2022] [Indexed: 02/05/2023] Open
Abstract
Foot-and-mouth disease virus (FMDV) can persistently infect pharyngeal epithelia in ruminants but not in pigs. Our previous studies demonstrated that persistent FMDV infection in cattle was associated with under-expression of several chemokines that recruit immune cells. This report focuses on the analysis of differentially expressed genes (DEG) identified during the transitional phase of infection, defined as the period when animals diverge between becoming carriers or terminators. During this phase, Th17-stimulating cytokines (IL6 and IL23A) and Th17-recruiting chemokines (CCL14 and CCL20) were upregulated in animals that were still infected (transitional carriers) compared to those that had recently cleared infection (terminators), whereas chemokines recruiting neutrophils and CD8+ T effector cells (CCL3 and ELR+CXCLs) were downregulated. Upregulated Th17-specific receptor, CCR6, and Th17-associated genes, CD146, MIR155, and ThPOK, suggested increased Th17 cell activity in transitional carriers. However, a complex interplay of the Th17 regulatory axis was indicated by non-significant upregulation of IL17A and downregulation of IL17F, two hallmarks of TH17 activity. Other DEG suggested that transitional carriers had upregulated aryl hydrocarbon receptor (AHR), non-canonical NFκB signaling, and downregulated canonical NFκB signaling. The results described herein provide novel insights into the mechanisms of establishment of FMDV persistence. Additionally, the fact that ruminants, unlike pigs, produce a large amount of AHR ligands suggests a plausible explanation of why FMDV persists in ruminants, but not in pigs.
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Affiliation(s)
- James J. Zhu
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
- Correspondence: (J.J.Z.); (J.A.); Tel.: +1-631-323-3340 (J.J.Z.); +1-631-323-4421 (J.A.); Fax: +1-631-323-3006 (J.A.)
| | - Carolina Stenfeldt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
- Department of Diagnostic Medicine/Pathobiology, Kansas State University, Manhattan, KS 66506, USA
| | - Elizabeth A. Bishop
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
| | - Jessica A. Canter
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
- Plum Island Animal Disease Center Research Participation Program, Oak Ridge Institute for Science and Education (ORISE), Oak Ridge, TN 37830, USA
| | - Michael Eschbaumer
- Institute of Diagnostic Virology, Friedrich-Loeffler-Institut, 17493 Greifswald-Insel Riems, Germany;
| | - Luis L. Rodriguez
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
| | - Jonathan Arzt
- Foreign Animal Disease Research Unit, Plum Island Animal Disease Center, Agricultural Research Service, United States Department of Agriculture, Orient, NY 11957, USA; (C.S.); (E.A.B.); (J.A.C.); (L.L.R.)
- Correspondence: (J.J.Z.); (J.A.); Tel.: +1-631-323-3340 (J.J.Z.); +1-631-323-4421 (J.A.); Fax: +1-631-323-3006 (J.A.)
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4
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Lee EP, Lin MJ, Wu HP. Time-serial expression of toll-like receptor 4 signaling during polymicrobial sepsis in rats. Int J Immunopathol Pharmacol 2022; 36:3946320221090021. [PMID: 35603454 PMCID: PMC9127845 DOI: 10.1177/03946320221090021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
Sepsis caused by aggressive infection is a severe clinical problem with an increasing incidence worldwide. Toll-like receptors and their common adapter myeloid differentiation factor 88 (MyD88) can activate immune responses by recognizing a foreign microbe’s product. This study aimed to identify the different time expression of TLR four signaling pathway in an experimental rodent model of polymicrobial sepsis. A randomized animal study was investigated in rats with septic peritonitis induced by cecal ligation and puncture (CLP). The expressions of MyD88-dependent pathway biomarkers, including MyD88, nuclear factor-κB (NF-κB), and serum tumor necrosis factor-α (TNF-α), were analyzed and compared to the sham controls at the different time points after CLP surgery. CLP-induced sepsis increased liver MyD88 mRNA expression and protein expression compared to the control groups at 2 h after surgery. The MyD88 mRNA and protein expressions in rats with CLP-induced sepsis marked increased at 4 and 6 h, and their NF-κB activities and serum TNF-α levels also increased at 4 h after CLP surgery (both p < .05). The different serial expression of MyD88-ependent pathway during sepsis may be used as biomarkers during sepsis. These results may provide further helpful information for using pro-inflammatory biomarkers of innate immunity such as MyD88 and TNF-α in clinical sepsis or related abdominal surgical emergency in the future.
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Affiliation(s)
- En-Pei Lee
- Division of Pediatric Critical Care Medicine, Department of Pediatrics, Chang Gung Memorial Hospital at Linko, Taiwan
- College of Medicine, Chang Gung University, Taiwan
| | - Mao-Jen Lin
- Division of Cardiology, Department of Medicine, Taichung Tzu Chi Hospital, The Buddhist Tzu Chi Medical Foundation, Taiwan
- Department of Medicine, School of Medicine, Tzu Chi University, Taiwan
| | - Han-Ping Wu
- Department of Pediatric Emergency Medicine, Children Hospital, China Medical University, Taichung, Taiwan
- Department of Medical Research, Children’s Hospital, China Medical University, Taichung, Taiwan
- Department of Medicine, School of Medicine, China Medical University, Taichung, Taiwan
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Nguyen TH, Turek I, Meehan-Andrews T, Zacharias A, Irving H. Analysis of interleukin-1 receptor associated kinase-3 (IRAK3) function in modulating expression of inflammatory markers in cell culture models: A systematic review and meta-analysis. PLoS One 2020; 15:e0244570. [PMID: 33382782 PMCID: PMC7774834 DOI: 10.1371/journal.pone.0244570] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2020] [Accepted: 12/13/2020] [Indexed: 11/18/2022] Open
Abstract
BACKGROUND IRAK3 is a critical modulator of inflammation in innate immunity. IRAK3 is associated with many inflammatory diseases, including sepsis, and is required in endotoxin tolerance to maintain homeostasis of inflammation. The impact of IRAK3 on inflammatory markers such as nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB), tumour necrosis factor-α (TNF-α) and interleukin-6 (IL-6) in cell culture models remains controversial. OBJECTIVE To analyse temporal effects of IRAK3 on inflammatory markers after one- or two-challenge interventions in cell culture models. METHODS A systematic search was performed to identify in vitro cell studies reporting outcome measures of expression of IRAK3 and inflammatory markers. Meta-analyses were performed where sufficient data were available. Comparisons of outcome measures were performed between different cell lines and human and mouse primary cells. RESULTS The literature search identified 7766 studies for screening. After screening titles, abstracts and full-texts, a total of 89 studies were included in the systematic review. CONCLUSIONS The review identifies significant effects of IRAK3 on decreasing NF-κB DNA binding activity in cell lines, TNF-α protein level at intermediate time intervals (4h-15h) in cell lines or at long term intervals (16h-48h) in mouse primary cells following one-challenge. The patterns of TNF-α protein expression in human cell lines and human primary cells in response to one-challenge are more similar than in mouse primary cells. Meta-analyses confirm a negative correlation between IRAK3 and inflammatory cytokine (IL-6 and TNF-α) expression after two-challenges.
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Affiliation(s)
- Trang Hong Nguyen
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, Victoria, Australia
| | - Ilona Turek
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, Victoria, Australia
| | - Terri Meehan-Andrews
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, Victoria, Australia
| | - Anita Zacharias
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, Victoria, Australia
| | - Helen Irving
- Department of Pharmacy and Biomedical Sciences, La Trobe Institute for Molecular Science, La Trobe University, Bendigo, Victoria, Australia
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6
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Wasko NJ, Nichols F, Clark RB. Multiple sclerosis, the microbiome, TLR2, and the hygiene hypothesis. Autoimmun Rev 2020; 19:102430. [DOI: 10.1016/j.autrev.2019.102430] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2019] [Accepted: 07/11/2019] [Indexed: 12/14/2022]
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7
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Tan HY, Li PZ, Gong JP, Yang K. Shenfu Injection Attenuates Bile Duct Injury in Rats with Acute Obstructive Cholangitis. Surg Infect (Larchmt) 2019; 20:424-430. [PMID: 30925118 DOI: 10.1089/sur.2018.304] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
Background: We investigated the effect of Shenfu injection (SFI) in Wistar rats with acute obstructive cholangitis (AOC) and considered the possible molecular mechanisms of the effects. Methods: The 96 rats were divided randomly into three groups. In one group, the common bile duct was subjected to ligation (BDL), and 0.2 mL of saline was injected into the proximal bile ducts. To create AOC, again, the common bile duct was ligated, and 0.2 mL of lipopolysaccharide (LPS)) (2 mg/mL) was injected into the proximal ducts. In the Shenfu injection (SFI) group, the material (10 mg/kg) was injected into the tail vein 2 hours before induction of AOC. The hepatic histopathologic changes were observed under a light microscope. The endotoxin, tumor necrosis factor-α (TNF-α), alanine transaminase (ALT), and total bilirubin (TB) concentrations in the serum were measured at different time points (0, 4, 8, and 16 hours) after ligation. The expression of nuclear transcription factor-κB (NF-κB) and CD14 in Kupffer cells also was analyzed at different times by Western blotting. Results: The TNF-α, ALT, and TB concentrations in the serum and the expression of CD14 and NF-κB in Kupffer cells were significantly higher in the SFI group than in the BDL group, but all were significantly lower than in the AOC group. Compared with the AOC group, the edema of cholangiocytes was alleviated in the SFI group, and the infiltration of inflammatory cells around cholangiocytes was reduced. Conclusion: Shenfu injection significantly alleviated bile duct injury. The potential mechanism may be associated with inhibition of CD14 expression and prevention of NF-κB activation in Kupffer cells.
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Affiliation(s)
- Hao-Yang Tan
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Pei-Zhi Li
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Jian-Ping Gong
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
| | - Kang Yang
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, People's Republic of China
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8
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Lu W, Gu JY, Zhang YY, Gong DJ, Zhu YM, Sun Y. Tolerance induced by Porphyromonas gingivalis may occur independently of TLR2 and TLR4. PLoS One 2018; 13:e0200946. [PMID: 30040860 PMCID: PMC6057631 DOI: 10.1371/journal.pone.0200946] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2018] [Accepted: 07/05/2018] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVE Periodontitis is a microbe-induced chronic inflammatory disease. Previous exposure of the host to bacteria or their virulence factors leads to refractory responses to further stimuli, which is called tolerance. Porphyromonas gingivalis (P. gingivalis) is one of the most important pathogenic microorganisms associated with periodontitis, and is a potent inducer of pro- and anti-inflammatory cytokines. The aim of this study was to explore the roles and possible mechanisms of tolerance induced by P. gingivalis. METHODS THP-1-derived macrophages were pretreated with 1x108 colony-forming units/ml P. gingivalis ATCC 33277 or 21 clinical isolates from moderate to severe chronic periodontitis patients (24 h), washed (2 h) and treated with P. gingivalis ATCC 33277 or the same clinical isolates again (24 h). Levels of pro-inflammatory cytokines TNF-α and IL-1β and anti-inflammatory cytokine IL-10 in supernatants were detected by ELISA. Moreover, to identify the possible mechanisms for the changes in cytokine secretion, Toll-like receptor 2 (TLR2) and TLR4 protein expressions were explored in these cells by flow cytometry. RESULTS After repeated challenge with P. gingivalis ATCC 33277 or clinical isolates, production of TNF-α and IL-1β in macrophages was decreased significantly compared with that following a single stimulation (p<0.05), while only comparable levels of IL-10 were detected in P. gingivalis ATCC 33277 or clinical isolate-tolerized cells (p>0.05). In addition, there was interstrain variability in the ability to induce IL-1β and IL-10 production after repeated P. gingivalis stimulation. However, no significant changes in TLR2 or TLR4 were detected in macrophages that were repeatedly treated with P. gingivalis ATCC 33277 or clinical isolates compared with those stimulated with P. gingivalis only once (p>0.05). CONCLUSIONS Repeated P. gingivalis stimulation triggered tolerance, which might contribute to limiting periodontal inflammation. However, tolerance induced by P. gingivalis might develop independently of TLR2 and TLR4 and be related to molecules in signaling pathways downstream of TLR2 and TLR4.
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Affiliation(s)
- Wei Lu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Jian-yu Gu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Yao-yao Zhang
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Dan-Jun Gong
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
- Department of Stomatology, Suzhou Hospital, Suzhou, China
| | - Yi-ming Zhu
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
| | - Ying Sun
- Jiangsu Key Laboratory of Oral Diseases, Nanjing Medical University, Nanjing, China
- Department of Periodontology, Affiliated Hospital of Stomatology, Nanjing Medical University, Nanjing, China
- * E-mail:
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Pattabiraman G, Murphy M, Agliano F, Karlinsey K, Medvedev AE. IRAK4 activity controls immune responses to intracellular bacteria Listeria monocytogenes and Mycobacterium smegmatis. J Leukoc Biol 2018; 104:811-820. [PMID: 29749650 DOI: 10.1002/jlb.2a1117-449r] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2017] [Revised: 03/26/2018] [Accepted: 04/17/2018] [Indexed: 12/26/2022] Open
Abstract
IL-1 receptor-associated kinase (IRAK) 4 is a central enzyme of the TLR pathways. This study tested the hypothesis that IRAK4 kinase activity is prerequisite for regulating innate immunity during infections with intracellular bacteria. To this end, we analyzed responses of macrophages obtained from mice expressing wild-type (WT) IRAK4 or its kinase-inactive K213M mutant (IRAK4KI ) upon infection with intracellular bacteria Listeria monocytogenes or Mycobacterium smegmatis. In contrast to robust induction of cytokines by macrophages expressing kinase-sufficient IRAK4, IRAK4KI macrophages expressed decreased TNF-α, IL-6, IL-1β, and C-C motif chemokine ligand 5 upon infection with L. monocytogenes or M. smegmatis. Bacterial infection of IRAK4KI macrophages led to attenuated activation of IRAK1, MAPKs and NF-κB, impaired induction of inducible NO synthase mRNA and secretion of NO, but resulted in elevated microbial burdens. Compared with WT animals, systemic infection of IRAK4KI mice with M. smegmatis or L. monocytogenes resulted in decreased levels of serum IL-6 and CXCL-1 but increased bacterial burdens in the spleen and liver. Thus, a loss of IRAK4 kinase activity underlies deficient cytokine and microbicidal responses during infection with intracellular bacteria L. monocytogenes or M. smegmatis via impaired activation of IRAK1, MAPKs, and NF-κB but increases bacterial burdens, correlating with decreased induction of NO.
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Affiliation(s)
- Goutham Pattabiraman
- Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Michael Murphy
- Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Federica Agliano
- Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Keaton Karlinsey
- Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut, USA
| | - Andrei E Medvedev
- Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut, USA
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10
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Song J, Han X, Yao YL, Li YM, Zhang J, Shao DY, Hou LS, Fan Y, Song SZ, Lian LH, Nan JX, Wu YL. Acanthoic acid suppresses lipin1/2 via TLR4 and IRAK4 signalling pathways in EtOH- and lipopolysaccharide-induced hepatic lipogenesis. J Pharm Pharmacol 2018; 70:393-403. [DOI: 10.1111/jphp.12877] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2017] [Accepted: 12/16/2017] [Indexed: 12/16/2022]
Abstract
Abstract
Objectives
In alcoholic liver disease, alcohol and lipopolysaccharide (LPS) are major stimulation factors of hepatic lipogenesis. Our objective was to determine the protective mechanism of acanthoic acid (AA) in EtOH- and LPS-induced hepatic lipogenesis.
Methods
HSC-T6 cells were treated with ethanol (200 mm) plus LPS (1 μg/ml) for 1 h, followed by AA (10 or 20 μm) for another 6 h. C57BL/6 mice were pretreated with of AA (20 and 40 mg/kg) or equal volume of saline and then exposed to three doses of ethanol (5 g/kg body weight) within 24 h. The mice were sacrificed at 6 h after the last ethanol dosing.
Key findings
Acanthoic acid significantly decreased the expressions of α-SMA, collagen-I, SREBP-1, and lipin1/2 induced, also decreased fat droplets caused by EtOH/LPS. AA treatment decreased the protein expressions of TLR4, CD14, IRAK4, TRAF3, p-TAK1 and NF-κB increased by EtOH/LPS on HSC cells. Results in vivo were consistent with results in vitro.
Conclusions
Our data demonstrated that AA might modulate hepatic fibrosis and lipid deposition in HSC-T6 cell stimulated with ethanol combined with LPS by decreasing lipin1/2 via TLR4 and IRAK4 signalling pathways, and AA might be considered as a potential therapeutic candidate for alcoholic liver disease.
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Affiliation(s)
- Jian Song
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Xin Han
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - You-Li Yao
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ya-Mei Li
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Jing Zhang
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Dan-Yang Shao
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Li-Shuang Hou
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ying Fan
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Shun-Zong Song
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Li-Hua Lian
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
| | - Ji-Xing Nan
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
- Clinical Research Center, Yanbian University Hospital, Yanji, China
| | - Yan-Ling Wu
- Key Laboratory for Natural Resource of Changbai Mountain & Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, Jilin Province, China
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Toll-Like Receptor Ligand-Induced Liver Injury in D-Galactosamine-Sensitized Mice: Differences between TLR7/8 and TLR9 Ligands, Cytokine Patterns, and Cross-Tolerance Induction by TLR2 Ligand Pretreatment. J Immunol Res 2017; 2017:9653793. [PMID: 29181417 PMCID: PMC5664326 DOI: 10.1155/2017/9653793] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 08/10/2017] [Accepted: 09/13/2017] [Indexed: 11/17/2022] Open
Abstract
Administration of Toll-like receptor ligands (TLRLs) is known to cause liver injury in D-galN-sensitized mice. In the present study, we aimed to complement preceding reports on the TLRL/D-galN system by analyzing comparisons among TLRLs, mouse strain dependence, effects on serum levels of cytokines, and effects of sequential administrations of different TLRLs. In a preliminary set of analyses, we first confirmed that liver failure can be induced by diverse TLRLs, including LTA and R848 in combination with D-galN. Analysis using TLR4-deficient mice excluded potential confounding effects of endogenous TLR4Ls that include those referred to as DAMPs in CpG DNA/D-galN hepatotoxicity. Subsequently, we showed that LTA pretreatment could prevent mortality in both CpG DNA/D-galN- and R848/D-galN-treated mice compared to without pretreatment. Incidentally, we observed that without the LTA pretreatment, CpG DNA/D-galN showed relatively higher liver-specific toxicity whereas R848/D-galN showed more symptoms of multiple organ failure. These findings suggest that, in D-galN-sensitized mice, different TLRLs not only show similarity in the ability to induce hepatic injury but also exhibit distinctive abilities in inducing systemic inflammation and multiple organ failure. These findings also suggest the potential usefulness of cross-tolerance induction using LTA in the prevention of organ failure in TLRL-mediated acute inflammation.
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Yi ZJ, Gong JP, Zhang W. Transcriptional co-regulator RIP140: An important mediator of the inflammatory response and its associated diseases (Review). Mol Med Rep 2017; 16:994-1000. [PMID: 28586037 DOI: 10.3892/mmr.2017.6683] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2016] [Accepted: 02/13/2017] [Indexed: 11/06/2022] Open
Abstract
The inflammatory response is a physiological process that is essential for maintaining homeostasis of the immune system. Inflammation is classified into acute inflammation and chronic inflammation, both of which pose a risk to human health. However, specific regulatory mechanisms of the inflammatory response remain to be elucidated. Receptor interacting protein (RIP) 140 is a nuclear receptor that affects an extensive array of biological and pathological processes in the body, including energy metabolism, inflammation and tumorigenesis. RIP140‑mediated macrophage polarization is important in regulating the inflammatory response. Overexpression of RIP140 in macrophages results in M1‑like polarization and expansion during the inflammatory response. Conversely, decreased expression of RIP140 in macrophages reduces the number of M1‑like macrophages and increases the number of alternatively polarized cells, which collectively promote endotoxin tolerance (ET) and relieve inflammation. This review summarizes the role of RIP140 in acute and chronic inflammatory diseases, with a focus on insulin resistance, atherosclerosis, sepsis and ET.
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Affiliation(s)
- Zhu-Jun Yi
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, Sichuan 400010, P.R. China
| | - Jian-Ping Gong
- Department of Hepatobiliary Surgery, The Second Affiliated Hospital of Chongqing Medical University, Chongqing, Sichuan 400010, P.R. China
| | - Wei Zhang
- Department of Hepatobiliary Surgery, The People's Hospital of Jianyang, Jianyang, Sichuan 641400, P.R. China
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Klaska IP, Muckersie E, Martin-Granados C, Christofi M, Forrester JV. Lipopolysaccharide-primed heterotolerant dendritic cells suppress experimental autoimmune uveoretinitis by multiple mechanisms. Immunology 2016; 150:364-377. [PMID: 27859049 PMCID: PMC5290303 DOI: 10.1111/imm.12691] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2016] [Revised: 11/01/2016] [Accepted: 11/08/2016] [Indexed: 12/14/2022] Open
Abstract
Exposure of bone‐marrow‐derived dendritic cells (BMDC) to high‐dose ultrapure lipopolysaccharide for 24 hr (LPS‐primed BMDC) enhances their potency in preventing inter‐photoreceptor retinoid binding protein: complete Freund's adjuvant‐induced experimental autoimmune uveoretinitis (EAU). LPS‐primed BMDC are refractory to further exposure to LPS (= endotoxin tolerance), evidenced here by decreased phosphorylation of TANK‐binding kinase 1, interferon regulatory factor 3 (IRF3), c‐Jun N‐terminal kinase and p38 mitogen‐activated protein kinase as well as impaired nuclear translocation of nuclear factor κB (NF‐κB) and IRF3, resulting in reduced tumour necrosis factor‐α (TNF‐α), interleukin‐6 (IL‐6), IL‐12 and interferon‐β secretion. LPS‐primed BMDC also show reduced surface expression of Toll‐like receptor‐4 and up‐regulation of CD14, followed by increased apoptosis, mediated via nuclear factor of activated T cells (NFATc)‐2 signalling. LPS‐primed BMDC are not only homotolerant to LPS but are heterotolerant to alternative pathogen‐associated molecular pattern ligands, such as mycobacterial protein extract (Mycobacterium tuberculosis). Specifically, while M. tuberculosis protein extract induces secretion of IL‐1β, TNF‐α and IL‐6 in unprimed BMDC, LPS‐primed BMDC fail to secrete these cytokines in response to M. tuberculosis. We propose that LPS priming of BMDC, by exposure to high doses of LPS for 24 hr, stabilizes their tolerogenicity rather than promoting immunogenicity, and does so by multiple mechanisms, namely (i) generation of tolerogenic apoptotic BMDC through CD14:NFATc signalling; (ii) reduction of NF‐κB and IRF3 signalling and downstream pro‐inflammatory cytokine production; and (iii) blockade of inflammasome activation.
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Affiliation(s)
- Izabela P Klaska
- Institute of Ophthalmology, University College London, London, UK
| | | | | | - Maria Christofi
- Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK
| | - John V Forrester
- Institute of Medical Sciences, University of Aberdeen, Aberdeen, UK.,Lions Eye Institute, University of Western Australia, Perth, WA, Australia
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Toll-like receptors signaling: A complex network for NF-κB activation in B-cell lymphoid malignancies. Semin Cancer Biol 2016; 39:15-25. [DOI: 10.1016/j.semcancer.2016.07.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 07/06/2016] [Accepted: 07/07/2016] [Indexed: 11/17/2022]
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da Silva DJ, Borges AF, Souza PO, de Souza PR, Cardoso CRDB, Dorta ML, de Oliveira MAP, Teixeira AL, Ribeiro-Dias F. Decreased Toll-Like Receptor 2 and Toll-Like Receptor 7/8-Induced Cytokines in Parkinson's Disease Patients. Neuroimmunomodulation 2016; 23:58-66. [PMID: 26886382 DOI: 10.1159/000443238] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/21/2015] [Accepted: 12/09/2015] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVES Toll-like receptors (TLRs) are expressed in several immune cells including blood monocytes and resident macrophages, such as microglia in the central nervous system. TLRs recognize pathogen- or damage-associated molecular patterns, leading to the release of inflammatory and toxic molecules, which can contribute to neuroinflammation associated with Parkinson's disease (PD). The aim of this study was to compare the potential of peripheral blood cells from PD patients or healthy subjects to produce cytokines after exposure to TLR agonists, and to investigate TLR2 and TLR4 expression on monocyte subsets. METHODS Twenty-one patients and 21 healthy controls were recruited. Patients were evaluated according to the Unified Parkinson's Disease Rating Scale, and Hoehn and Yahr stage. Cytokines were measured in supernatants of whole blood cultures after incubation with TLR2, TLR4, or TLR7/8 agonists, by cytometric bead array. Expression of CD14, CD16, TLR2, and TLR4 was analyzed by cytometry. RESULTS Patient blood cells produced lower levels of cytokines in response to TLR2 and also after TLR7/8/R848 activation than controls. Percentages of CD14+CD16+ or CD14+CD16- monocytes and TLR2 and TLR4 expression were similar between patients and controls. CONCLUSIONS Blood leukocyte TLR2 and TLR7/8 responses are impaired in PD. This was neither associated with imbalance in monocyte subsets nor with TLR2/TLR4 expression on these cells. The association between a decreased TLR response in periphery and damage of brain in PD must be further investigated.
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Affiliation(s)
- Delson José da Silva
- Instituto de Patologia Tropical e Sax00FA;de Px00FA;blica, Universidade Federal de Goix00E1;s, Goix00E2;nia, Brazil
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Xiong Y, Murphy M, Manavalan TT, Pattabiraman G, Qiu F, Chang HH, Ho IC, Medvedev AE. Endotoxin Tolerance Inhibits Lyn and c-Src Phosphorylation and Association with Toll-Like Receptor 4 but Increases Expression and Activity of Protein Phosphatases. J Innate Immun 2015; 8:171-84. [PMID: 26457672 DOI: 10.1159/000440838] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2015] [Accepted: 09/03/2015] [Indexed: 11/19/2022] Open
Abstract
Endotoxin tolerance protects the host by limiting excessive 'cytokine storm' during sepsis, but compromises the ability to counteract infections in septic shock survivors. It reprograms Toll-like receptor (TLR) 4 responses by attenuating the expression of proinflammatory cytokines without suppressing anti-inflammatory and antimicrobial mediators, but the mechanisms of reprogramming remain unclear. In this study, we demonstrate that the induction of endotoxin tolerance in human monocytes, THP-1 and MonoMac-6 cells inhibited lipopolysaccharide (LPS)-mediated phosphorylation of Lyn, c-Src and their recruitment to TLR4, but increased total protein phosphatase (PP) activity and the expression of protein tyrosine phosphatase (PTP) 1B, PP2A, PTP nonreceptor type (PTPN) 22 and mitogen-activated protein kinase phosphatase (MKP)-1. Chemical PP inhibitors, okadaic acid, dephostatin and cantharidic acid markedly decreased or completely abolished LPS tolerance, indicating the importance of phosphatases in endotoxin tolerization. Overexpression of PTPN22 decreased LPS-mediated nuclear factor (NF)-x03BA;B activation, p38 phosphorylation and CXCL8 gene expression, while PTPN22 ablation upregulated LPS-induced p65 NF-x03BA;B and p38 phosphorylation and the expression of TNF-α and pro-IL-1β mRNA, indicating PTPN22 as an inhibitor of TLR4 signaling. Thus, LPS tolerance interferes with TLR4 signaling by inhibiting Lyn and c-Src phosphorylation and their recruitment to TLR4, while increasing the phosphatase activity and expression of PP2A, PTPN22, PTP1B and MKP1.
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Affiliation(s)
- Yanbao Xiong
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Md., USA
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Julian MW, Strange HR, Ballinger MN, Hotchkiss RS, Papenfuss TL, Crouser ED. Tolerance and Cross-Tolerance following Toll-Like Receptor (TLR)-4 and -9 Activation Are Mediated by IRAK-M and Modulated by IL-7 in Murine Splenocytes. PLoS One 2015. [PMID: 26218271 PMCID: PMC4517781 DOI: 10.1371/journal.pone.0132921] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Objective Immune suppression during critical illness predisposes to serious infections. We sought to determine the mechanisms regulating tolerance and cross-tolerance to common pro-inflammatory danger signals in a model that recapitulates the intact in vivo immune response. Materials and Methods Flt3-expanded splenocytes obtained from wild-type or matching IRAK-M knockout (IRAK-M-/-), C57BL/6, male mice (8–10 weeks old) were treated repeatedly or alternately with either LPS or CpGA DNA, agonists of Toll-like receptor (TLR)-4 and -9, respectively, over successive 24-hour periods. Supernatants were collected following each 24-hour period with cytokine release (ELISA) and splenocyte IRAK-M expression (Western blot) determined. Tolerance and cross-tolerance were assessed in the absence or presence of programmed death receptor (PD)-1 blocking antibody or IL-7 pre-treatment. Main Results Splenocytes notably exhibited both tolerance and cross-tolerance to subsequent treatments with either LPS or CpGA DNA. The character of tolerance and cross-tolerance in this model was distinct following initial LPS or CpGA treatment in that TNFα and IFNγ release (not IL-10) were suppressed following LPS; whereas, initial CpGA treatment suppressed TNFα, IFNγ and IL-10 release in response to subsequent stimulation (LPS or CpGA). Tolerance and cross-tolerance were unrelated to IL-10 release or PD-1 but were attenuated in IRAK-M-/- splenocytes. IL-7 significantly suppressed IRAK-M expression and restored TNFα and IFNγ production without influencing IL-10 release. Conclusions In summary, acute immune tolerance and cross-tolerance in response to LPS or CpGA were distinct in that LPS selectively suppressed pro-inflammatory cytokine responses; whereas, CpGA suppressed both pro- and anti-inflammatory responses. The induction of tolerance and cross-tolerance in response to common danger signals was mechanistically unrelated to IL-10 or PD-1 but was directly influenced by IRAK-M expression. IL-7 reduced IRAK-M expression and attenuated immune tolerance induced by either LPS or CpGA, and thus may be useful for reversal of immune tolerance in the setting of critical illness.
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Affiliation(s)
- Mark W. Julian
- Dorothy M. Davis Heart and Lung Research Institute, Division of Pulmonary Allergy, Critical Care, and Sleep Medicine, Wexner Medical Center, Columbus, OH, United States of America
| | - Heather R. Strange
- College of Veterinary Medicine, Department of Veterinary Biosciences, The Ohio State University, Columbus, OH, United States of America
| | - Megan N. Ballinger
- Dorothy M. Davis Heart and Lung Research Institute, Division of Pulmonary Allergy, Critical Care, and Sleep Medicine, Wexner Medical Center, Columbus, OH, United States of America
| | - Richard S. Hotchkiss
- Departments of Anesthesiology, Medicine and Surgery, Washington University School of Medicine, St. Louis, MO, United States of America
| | - Tracey L. Papenfuss
- College of Veterinary Medicine, Department of Veterinary Biosciences, The Ohio State University, Columbus, OH, United States of America
| | - Elliott D. Crouser
- Dorothy M. Davis Heart and Lung Research Institute, Division of Pulmonary Allergy, Critical Care, and Sleep Medicine, Wexner Medical Center, Columbus, OH, United States of America
- * E-mail:
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Murphy M, Xiong Y, Pattabiraman G, Qiu F, Medvedev AE. Pellino-1 Positively Regulates Toll-like Receptor (TLR) 2 and TLR4 Signaling and Is Suppressed upon Induction of Endotoxin Tolerance. J Biol Chem 2015; 290:19218-32. [PMID: 26082489 DOI: 10.1074/jbc.m115.640128] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2015] [Indexed: 11/06/2022] Open
Abstract
Endotoxin tolerance reprograms Toll-like receptor (TLR) 4-mediated macrophage responses by attenuating induction of proinflammatory cytokines while retaining expression of anti-inflammatory and antimicrobial mediators. We previously demonstrated deficient TLR4-induced activation of IL-1 receptor-associated kinase (IRAK) 4, IRAK1, and TANK-binding kinase (TBK) 1 as critical hallmarks of endotoxin tolerance, but mechanisms remain unclear. In this study, we examined the role of the E3 ubiquitin ligase Pellino-1 in endotoxin tolerance and TLR signaling. LPS stimulation increased Pellino-1 mRNA and protein expression in macrophages from mice injected with saline and in medium-pretreated human monocytes, THP-1, and MonoMac-6 cells, whereas endotoxin tolerization abrogated LPS inducibility of Pellino-1. Overexpression of Pellino-1 in 293/TLR2 and 293/TLR4/MD2 cells enhanced TLR2- and TLR4-induced nuclear factor κB (NF-κB) and expression of IL-8 mRNA, whereas Pellino-1 knockdown reduced these responses. Pellino-1 ablation in THP-1 cells impaired induction of myeloid differentiation primary response protein (MyD88), and Toll-IL-1R domain-containing adapter inducing IFN-β (TRIF)-dependent cytokine genes in response to TLR4 and TLR2 agonists and heat-killed Escherichia coli and Staphylococcus aureus, whereas only weakly affecting phagocytosis of heat-killed bacteria. Co-expressed Pellino-1 potentiated NF-κB activation driven by transfected MyD88, TRIF, IRAK1, TBK1, TGF-β-activated kinase (TAK) 1, and TNFR-associated factor 6, whereas not affecting p65-induced responses. Mechanistically, Pellino-1 increased LPS-driven K63-linked polyubiquitination of IRAK1, TBK1, TAK1, and phosphorylation of TBK1 and IFN regulatory factor 3. These results reveal a novel mechanism by which endotoxin tolerance re-programs TLR4 signaling via suppression of Pellino-1, a positive regulator of MyD88- and TRIF-dependent signaling that promotes K63-linked polyubiquitination of IRAK1, TBK1, and TAK1.
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Affiliation(s)
- Michael Murphy
- From the Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut 06030 and
| | - Yanbao Xiong
- the Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Goutham Pattabiraman
- From the Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut 06030 and
| | - Fu Qiu
- the Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, Maryland 21201
| | - Andrei E Medvedev
- From the Department of Immunology, University of Connecticut Health Center, Farmington, Connecticut 06030 and
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Lee MS. Treatment of autoimmune diabetes by inhibiting the initial event. Immune Netw 2013; 13:194-8. [PMID: 24198744 PMCID: PMC3817300 DOI: 10.4110/in.2013.13.5.194] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2013] [Revised: 09/27/2013] [Accepted: 10/04/2013] [Indexed: 02/07/2023] Open
Abstract
Recent papers have shown that the initial event in the pathogenesis of autoimmune type 1 diabetes (T1D) comprises sensing of molecular patterns released from apoptotic β-cells by innate immune receptors such as toll-like receptor (TLR). We have reported that apoptotic β-cells undergoing secondary necrosis called 'late apoptotic' β-cells stimulate dendritic cells (DCs) and induce diabetogenic T cell priming through TLR2. The role of other innate immune receptors such as TLR7 or TLR9 in the initiation of T1D has also been suggested. We hypothesized that TLR2 blockade could inhibit T1D at the initial step of T1D. Indeed, when a TLR2 agonist, Pam3CSK4 was administered chronically, the development of T1D in nonobese diabetic (NOD) mice was inhibited. Diabetogenic T cell priming by DCs was attenuated by chronic treatment with Pam3CSK4, indicating DC tolerance. For the treatment of established T1D, immune tolerance alone is not enough because β-cell mass is critically reduced. We employed TLR2 tolerance in conjunction with islet transplantation, which led to reversal of newly established T1D. Dipeptidyl peptidase 4 (DPP4) inhibitors are a new class of anti-diabetic agents that have beneficial effects on β-cells. We investigated whether a combination of DPP4 inhibition and TLR2 tolerization could reverse newly established T1D without islet transplantation. We could achieve normoglycemia by TLR2 tolerization in combination with DPP4 inhibition but not by TLR2 tolerization or DPP4 inhibition alone. β-cell mass was significantly increased by combined treatment with TLR2 tolerization and DPP4 inhibition. These results suggest the possibility that a novel strategy of TLR tolerization will be available for the inhibition or treatment of established T1D when combined with measures increasing critically reduced β-cell mass of T1D patients such as DPP4 inhibition or stem cell technology.
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Affiliation(s)
- Myung-Shik Lee
- Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul 135-710, Korea
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