1
|
Wang TT, Jiang WR, Xu L, Zhou MY, Huang YS. Effect of blockage of Trem1 on the M1 polarization of macrophages in the regulation dental pulp inflammation. Eur J Oral Sci 2024; 132:e13018. [PMID: 39267299 DOI: 10.1111/eos.13018] [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: 03/05/2024] [Accepted: 08/22/2024] [Indexed: 09/17/2024]
Abstract
Dental pulp inflammation is a common and significant factor related to poor dental prognosis. Current treatment strategies primarily concentrate on managing the inflammatory response, with specific targets for intervention still under investigation. Triggering receptors expressed on myeloid cells (TREMs) are a group of receptor molecules extensively present on myeloid cell surfaces, crucial in the regulation of inflammatory process. Our analysis of transcriptomic sequencing data from clinical pulp samples of dataset GSE77459 and animal models revealed up-regulation of Trem1 during pulpitis. Administration of the Trem1-blocking peptide LP17 led to lower (more than 1-fold) levels of several pro-inflammatory factors and inhibition of M1 macrophage polarization both in vivo and in vitro. This study of the expression patterns and functions of Trem1 in the development of dental pulp inflammation provides novel insights into the therapeutic strategies for clinical pulpitis.
Collapse
Affiliation(s)
- Ting-Ting Wang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Wen-Rui Jiang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Li Xu
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Mei-Yun Zhou
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| | - Yong-Song Huang
- Department of Stomatology, The First Affiliated Hospital of Bengbu Medical University, Bengbu, Anhui, China
| |
Collapse
|
2
|
Li P, Wang R, Dong WQ, Wang GY, Zhang AD, Chen HC, Tan C. Systemic neutrophils are triggered by respiratory Bacillus Calmette- Guérin and mediate pulmonary mycobacterial clearance in synergy with the triggering receptor expressed on myeloid cells 1. Microb Pathog 2024; 187:106535. [PMID: 38176463 DOI: 10.1016/j.micpath.2024.106535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 12/26/2023] [Accepted: 01/02/2024] [Indexed: 01/06/2024]
Abstract
Tuberculosis remains a threat to public health. The only approved vaccine, Bacillus Calmette-Guérin (BCG), is administered intradermally and provides limited protection, and its effect on innate immunity via the respiratory route has not been fully elucidated. A mouse model with genetically depleted TREM1 and seven-color flow cytometry staining were used to characterize the comprehensive immune response induced by respiratory BCG, through evaluating organ bacterial loads, lung histopathology, and lung immunohistochemistry. During respiratory BCG infection, the murine lungs displayed effective bacterial clearance. Notably, marked differences in neutrophils were observed between thymus and bone marrow cells, characterized by a significant increase in the expression of the triggering receptor expressed on myeloid cells 1 (TREM1). Subsequently, upon depletion of TREM1, a reduction in pulmonary neutrophils was observed, which further exacerbated bacterial loads and resulted in worsened pathology following respiratory BCG infection. In summary, up-regulated expression of TREM1 in rapidly increasing circulating neutrophil by pulmonary BCG is required for an efficient host response to BCG infection, and suggests the important role of TREM1 in neutrophil-related pulmonary bacteria clearance and pathology.
Collapse
Affiliation(s)
- Pei Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China; Systematic Immunology of Tuberculosis, National Clinical Research Center for Infectious Disease, Shenzhen Third People's Hospital, Shenzhen, China
| | - Rui Wang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China; Department of Experimental Animal Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Wen-Qi Dong
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Gao-Yan Wang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - An-Ding Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Huan-Chun Chen
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Chen Tan
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, Hubei, China.
| |
Collapse
|
3
|
Hullahalli K, Dailey KG, Hasegawa Y, Torres E, Suzuki M, Zhang H, Threadgill DW, Navarro VM, Waldor MK. Genetic and immune determinants of E. coli liver abscess formation. Proc Natl Acad Sci U S A 2023; 120:e2310053120. [PMID: 38096412 PMCID: PMC10743367 DOI: 10.1073/pnas.2310053120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2023] [Accepted: 11/09/2023] [Indexed: 12/18/2023] Open
Abstract
Systemic infections can yield distinct outcomes in different tissues. In mice, intravenous inoculation of Escherichia coli leads to bacterial replication within liver abscesses, while other organs such as the spleen clear the pathogen. Abscesses are macroscopic necrotic regions that comprise the vast majority of the bacterial burden in the animal, yet little is known about the processes underlying their formation. Here, we characterize E. coli liver abscesses and identify host determinants of abscess susceptibility. Spatial transcriptomics revealed that liver abscesses are associated with heterogenous immune cell clusters comprised of macrophages, neutrophils, dendritic cells, innate lymphoid cells, and T-cells that surround necrotic regions of the liver. Abscess susceptibility is heightened in the C57BL lineage, particularly in C57BL/6N females. Backcross analyses demonstrated that abscess susceptibility is a polygenic trait inherited in a sex-dependent manner without direct linkage to sex chromosomes. As early as 1 d post infection, the magnitude of E. coli replication in the liver distinguishes abscess-susceptible and abscess-resistant strains of mice, suggesting that the immune pathways that regulate abscess formation are induced within hours. We characterized the early hepatic response with single-cell RNA sequencing and found that mice with reduced activation of early inflammatory responses, such as those lacking the LPS receptor TLR4 (Toll-like receptor 4), are resistant to abscess formation. Experiments with barcoded E. coli revealed that TLR4 mediates a tradeoff between abscess formation and bacterial clearance. Together, our findings define hallmarks of E. coli liver abscess formation and suggest that hyperactivation of the hepatic innate immune response drives liver abscess susceptibility.
Collapse
Affiliation(s)
- Karthik Hullahalli
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| | - Katherine G. Dailey
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| | - Yuko Hasegawa
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| | - Encarnacion Torres
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA02115
| | - Masataka Suzuki
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| | - Hailong Zhang
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| | - David W. Threadgill
- Department of Cell Biology and Genetics, Texas A&M University, College Station, TX76549
- Department of Nutrition, Texas A&M University, College Station, TX76549
| | - Victor M. Navarro
- Department of Medicine, Division of Endocrinology, Diabetes and Hypertension, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA02115
| | - Matthew K. Waldor
- Department of Microbiology, Harvard Medical School, Boston, MA02115
- Division of Infectious Diseases, Brigham & Women’s Hospital, Boston, MA02115
| |
Collapse
|
4
|
Abstract
Triggering receptors expressed on myeloid cells (TREMs) encompass a family of cell-surface receptors chiefly expressed by granulocytes, monocytes and tissue macrophages. These receptors have been implicated in inflammation, neurodegenerative diseases, bone remodelling, metabolic syndrome, atherosclerosis and cancer. Here, I review the structure, ligands, signalling modes and functions of TREMs in humans and mice and discuss the challenges that remain in understanding TREM biology.
Collapse
Affiliation(s)
- Marco Colonna
- Department of Pathology and Immunology, Washington University School of Medicine, St Louis, MO, USA.
| |
Collapse
|
5
|
Hullahalli K, Dailey KG, Hasegawa Y, Suzuki M, Zhang H, Threadgill DW, Waldor MK. Genetic and immune determinants of E. coli liver abscess formation. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2023:2023.06.11.543319. [PMID: 37398354 PMCID: PMC10312621 DOI: 10.1101/2023.06.11.543319] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2023]
Abstract
Systemic infections can yield distinct outcomes in different tissues. In mice, intravenous inoculation of E. coli leads to bacterial replication within liver abscesses while other organs such as the spleen largely clear the pathogen. Abscesses are macroscopic necrotic regions that comprise the vast majority of the bacterial burden in the animal, yet little is known about the processes underlying their formation. Here, we characterize E. coli liver abscesses and identify host determinants of abscess susceptibility. Spatial transcriptomics revealed that liver abscesses are associated with heterogenous immune cell clusters comprised of macrophages, neutrophils, dendritic cells, innate lymphoid cells, and T-cells that surround necrotic regions of the liver. Susceptibility to liver abscesses is heightened in the C57BL/6 lineage, particularly in C57BL/6N females. Backcross analyses demonstrated that abscess susceptibility is a polygenic trait inherited in a sex-dependent manner without direct linkage to sex chromosomes. As early as one day post infection, the magnitude of E. coli replication in the liver distinguishes abscess-susceptible and abscess-resistant strains of mice, suggesting that the immune pathways that regulate abscess formation are induced within hours. We characterized the early hepatic response with single-cell RNA sequencing and found that mice with reduced activation of early inflammatory responses, such as those lacking the LPS receptor TLR4, are resistant to abscess formation. Experiments with barcoded E. coli revealed that TLR4 mediates a tradeoff between abscess formation and bacterial clearance. Together, our findings define hallmarks of E. coli liver abscess formation and suggest that hyperactivation of the hepatic innate immune response drives liver abscess susceptibility.
Collapse
Affiliation(s)
- Karthik Hullahalli
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| | - Katherine G Dailey
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| | - Yuko Hasegawa
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| | - Masataka Suzuki
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| | - Hailong Zhang
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| | - David W Threadgill
- Department of Cell Biology and Genetics and Department of Nutrition, Texas A&M University, College Station, TX 76549, USA
| | - Matthew K Waldor
- Department of Microbiology, Harvard Medical School, Boston, MA 02115; Division of Infectious Diseases, Brigham & Women's Hospital, Boston, MA 02115
| |
Collapse
|
6
|
Wu J, Chen J, Wang Y, Meng Q, Zhao J. Siderophore iucA of hypermucoviscous Klebsiella pneumoniae promotes liver damage in mice by inducing oxidative stress. Biochem Biophys Rep 2022; 32:101376. [PMID: 36340868 PMCID: PMC9634269 DOI: 10.1016/j.bbrep.2022.101376] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 11/06/2022] Open
Abstract
The hypermucoviscosity/hypervirulent K. pneumoniae (hvKP) is a dominant cause of pyogenic liver abscess (PLA) and has contributed to the endemicity of disease in Asian country. The siderophore aerobactin (iucA) is highly expressed in hvKP and acting virulence role during hvKP infection. However, its role in the PLA is poorly understood. We constructed iucA deletion mutant (ΔiucA-hvKP852) and used animal study to characterize the role of siderophore iucA in K. pneumoniae liver abscess. The animal experiments showed that ΔiucA-hvKP852 strain had lower virulence in mice compared to hvKP852 wild type strain. At 24 h after infection, only two of ten mice developed liver abscess during infection with ΔiucA-hvKP852 strain, while nine of ten mice infected with wild type hvKP852 strain showed multiple lesions of liver abscess. The liver tissue infected with ΔiucA-hvKP852 exhibited low reactive oxygen stress levels compared to those infected by wild type hvKP852 strain (P < 0.05). The results suggest that siderophore iucA play an important role in the liver abscess by inducing oxidative stress. iucA positive strains produces more siderophore than iucA negative hvK. pneumoniae. Siderophore production is positively related with Oxidative stress in hvK. pneumoniae. iucA enhances oxidative stress in liver and forms liver abscess during hvK. pneumoniae infection.
Collapse
Affiliation(s)
- Jinyin Wu
- Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China
| | - Jie Chen
- Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China
| | - Ying Wang
- Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China
| | - Qingtai Meng
- Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China
| | - Jizi Zhao
- Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China,Heilongjiang Provincial Key Laboratory of Infection and Immunity, Pathogen Biology, Harbin, China,Corresponding author. Wu Lien Teh Institute, Department of Microbiology, Harbin Medical University, 157, Baojian Road, Nangang District, Harbin, 150081, China.
| |
Collapse
|
7
|
Deng Q, Yang S, Sun L, Dong K, Li Y, Wu S, Huang R. Salmonella effector SpvB aggravates dysregulation of systemic iron metabolism via modulating the hepcidin-ferroportin axis. Gut Microbes 2022; 13:1-18. [PMID: 33475464 PMCID: PMC7833757 DOI: 10.1080/19490976.2020.1849996] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Iron withholding, an essential component of nutritional immunity, plays a fundamental role in host resistance to Salmonella infection. Our previous study showed that SpvB, an important pSLT-encoded cytotoxic effector, facilitated Salmonella pathogenesis within macrophages via perturbing cellular iron metabolism. However, the underlying mechanisms of SpvB in Salmonella-relevant disorders of systemic iron metabolism have not yet been identified. Here, we demonstrated that SpvB facilitated Salmonella to scavenge iron from the host by modulating the hepcidin-ferroportin axis, a key regulator of systemic iron metabolism. We observed that SpvB enhanced hepatic hepcidin synthesis in a STAT3-dependent manner, but not the BMP/SMAD pathway. This subsequently resulted in a reduction of the unique cellular iron exporter ferroportin, which facilitated hypoferremia and hepatic iron accumulation and ultimately countered the limitation of iron availability, thereby improving the chances of Salmonella survival and replication. Moreover, SpvB promoted the production of proinflammatory molecules associated with the infiltration of inflammatory cells via highly upregulating TREM-1 signaling. Our data supported a role of TREM-1 in SpvB-related dysregulation of host iron metabolism and suggested that targeting TREM-1 might provide a potential therapeutic strategy to prevent or alleviate Salmonella pathogenesis.
Collapse
Affiliation(s)
- Qifeng Deng
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China,CONTACT Shuyan Wu Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, No. 199, Ren Ai Road, Suzhou, Jiangsu 215123, PR China
| | - Sidi Yang
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China,Rui Huang Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, No. 199, Ren Ai Road, Suzhou, Jiangsu 215123, PR China
| | - Lanqing Sun
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China
| | - Kedi Dong
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China
| | - Yuanyuan Li
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China
| | - Shuyan Wu
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China,CONTACT Shuyan Wu Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, No. 199, Ren Ai Road, Suzhou, Jiangsu 215123, PR China
| | - Rui Huang
- Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, Suzhou, Jiangsu, PR China,Rui Huang Department of Medical Microbiology, School of Biology & Basic Medical Sciences, Medical College of Soochow University, No. 199, Ren Ai Road, Suzhou, Jiangsu 215123, PR China
| |
Collapse
|
8
|
Zheng Y, Ding Y, Xu M, Chen H, Zhang H, Liu Y, Shen W, Li J. Gut Microbiota Contributes to Host Defense Against Klebsiella pneumoniae-Induced Liver Abscess. J Inflamm Res 2021; 14:5215-5225. [PMID: 34675599 PMCID: PMC8519413 DOI: 10.2147/jir.s334581] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 09/29/2021] [Indexed: 12/27/2022] Open
Abstract
Purpose Klebsiella pneumoniae-induced liver abscess (KLA) is a type of pyogenic liver abscess (PLA), which is a distinct invasive syndrome that has been increasingly reported worldwide over the past two decades. The intestinal microbiota is increasingly recognized as an important modulator that can promote and maintain host immune homeostasis. However, its precise role in liver abscess is unknown. We aimed to investigate the function of the gut microbiota in the host defense against K. pneumoniae infection. Methods We constructed C57BL/6J mice with KLA and analyzed the diversity and richness of the intestinal microflora by 16S rRNA sequencing. Next, to create a microbiota-depleted (MD) mouse model, we administered multiple broad-spectrum antibiotics and validated the model using 16S rRNA sequencing. At 48 h after K. pneumoniae infection, we assessed the general health condition, liver injury, bacterial loads, and inflammatory factor levels in MD+KLA mice. Additionally, fecal microbiota transplantation (FMT) was conducted in another group of MD+KLA mice prior to K. pneumoniae infection, and we assessed whether the transplantation changed the outcomes. Results The diversity of the intestinal flora was significantly changed in KLA mice compared to control mice, with a decrease in beneficial bacteria and an increase in harmful bacteria. The MD+KLA mice exhibited impaired antimicrobial capacity, reduced survival, increased inflammation and liver damage at 48 h after K. pneumoniae infection compared to the KLA mice. However, FMT normalized the inflammatory cytokine levels, reduced liver damage, and increased survival. Conclusion This study identified the gut microbiota as a protective factor against K. pneumoniae infection. The role of FMT in KLA should be investigated in future clinical studies.
Collapse
Affiliation(s)
- Yahong Zheng
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Yuting Ding
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Mengran Xu
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Haoran Chen
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Hui Zhang
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Yanyan Liu
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China.,Anhui Center for Surveillance of Bacterial Resistance, Hefei, Anhui, People's Republic of China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Weihua Shen
- Department of Special Clinic, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| | - Jiabin Li
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China.,Anhui Center for Surveillance of Bacterial Resistance, Hefei, Anhui, People's Republic of China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, Anhui, People's Republic of China.,Department of Infectious Diseases, The Chaohu Affiliated Hospital of Anhui Medical University, Hefei, Anhui, People's Republic of China
| |
Collapse
|
9
|
Reduced uterine tissue damage during Chlamydia muridarum infection in TREM-1,3 deficient mice. Infect Immun 2021; 89:e0007221. [PMID: 34125599 DOI: 10.1128/iai.00072-21] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Genital infections with Chlamydia trachomatis can lead to uterine and oviduct tissue damage in the female reproductive tract. Neutrophils are strongly associated with tissue damage during chlamydial infection, while an adaptive CD4 T cell response is necessary to combat infection. Activation of triggering receptor expressed on myeloid cells-1 (TREM-1) on neutrophils has previously been shown to induce and/or enhance degranulation synergistically with TLR-signaling. Additionally, TREM-1 can promote neutrophil transepithelial migration. In this study, we sought to determine the contribution of TREM-1,3 in immunopathology in the female mouse genital tract during Chlamydia muridarum infection. Relative to control mice, trem1,3-/- mice had no difference in chlamydial burden or duration of lower genital tract infection. We also observed a similar incidence of oviduct hydrosalpinx 45 days post-infection in trem1,3-/- compared to WT mice. However, compared to WT, trem1,3-/- mice developed significantly fewer uterine horn hydrometra. Early in infection, trem1,3-/- mice displayed a notable decrease in the number of uterine glands containing polymorphonuclear cells and uterine horn lumens had fewer neutrophils, with increased G-CSF. Trem1,3-/- mice also had reduced erosion of the luminal epithelium. These data indicate TREM-1,3 contributes to transepithelial neutrophil migration in the uterus and uterine glands, promoting the development of uterine hydrometra in infected mice.
Collapse
|
10
|
Triggering receptor expressed on myeloid cells-1 (TREM-1) contributes to Bordetella pertussis inflammatory pathology. Infect Immun 2021; 89:e0012621. [PMID: 34097504 DOI: 10.1128/iai.00126-21] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Whooping cough (pertussis) is a severe pulmonary infectious disease caused by the bacteria Bordetella pertussis. Pertussis infects an estimated 24 million people annually, resulting in >150,000 deaths. The NIH placed pertussis on the list of emerging pathogens in 2015. Antibiotics are ineffective unless administered before the onset of the disease characteristic cough. Therefore, there is an urgent need for novel pertussis therapeutics. We have shown that sphingosine-1-phosphate receptor (S1PR) agonists reduce pertussis inflammation, without increasing bacterial burden. Transcriptomic studies were performed to identify this mechanism and allow for the development of pertussis therapeutics which specifically target problematic inflammation without sacrificing bacterial control. These data suggested a role for triggering receptor expressed on myeloid cells-1 (TREM-1). TREM-1 cell surface receptor functions as an amplifier of inflammatory responses. Expression of TREM-1 is increased in response to bacterial infection of mucosal surfaces. In mice, B. pertussis infection results in TLR9-dependent increased expression of TREM-1 and its associated cytokines. Interestingly, S1PR agonists dampen pulmonary inflammation and TREM-1 expression. Mice challenged intranasally with B. pertussis and treated with ligand-dependent (LP17) and ligand-independent (GF9) TREM-1 inhibitors showed no differences in bacterial burden and significantly reduced TNF-α and CCL-2 expression compared to controls. Mice receiving TREM-1 inhibitors showed reduced pulmonary inflammation compared to controls indicating that TREM-1 promotes inflammatory pathology, but not bacterial control, during pertussis infection. This implicates TREM-1 as a potential therapeutic target for the treatment of pertussis.
Collapse
|
11
|
Park WB, Kim S, Shim S, Yoo HS. Identification of Dendritic Cell Maturation, TLR, and TREM1 Signaling Pathways in the Brucella canis Infected Canine Macrophage Cells, DH82, Through Transcriptomic Analysis. Front Vet Sci 2021; 8:619759. [PMID: 33829052 PMCID: PMC8020338 DOI: 10.3389/fvets.2021.619759] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2020] [Accepted: 02/08/2021] [Indexed: 11/24/2022] Open
Abstract
Research has been undertaken to understand the host immune response to Brucella canis infection because of the importance of the disease in the public health field and the clinical field. However, the previous mechanisms governing this infection have not been elucidated. Therefore, in vitro models, which mimic the in vivo infection route using a canine epithelial cell line, D17, and a canine macrophage, DH82, were established to determine these mechanisms by performing an analysis of the transcriptomes in the cells. In this study, a coculture model was constructed by using the D17 cell line and DH82 cell line in a transwell plate. Also, a single cell line culture system using DH82 was performed. After the stimulation of the cells in the two different systems infected with B. canis, the gene expression in the macrophages of the two different systems was analyzed by using RNA-sequencing (RNA-seq), and a transcriptomic analysis was performed by using the Ingenuity Pathway Analysis (IPA). Gene expression patterns were analyzed in the DH82 cell line at 2, 12, and 24 h after the stimulation with B. canis. Changes in the upregulated or downregulated genes showing 2-fold or higher were identified at each time point by comparing with the non-stimulated group. Differentially expressed genes (DEGs) between the two culture models were identified by using the IPA program. Generally, the number of genes expressed in the single cell line culture was higher than the number of genes expressed in the coculture model for all-time points. The expression levels of those genes were higher in the single cell line culture (p < 0.05). This analysis indicated that the immune response-related pathways, especially, the dendritic cell maturation, Triggering receptor expression on myeloid cells 1 (TREM1) signaling, and Toll-like receptor (TLR) signaling pathway, were significantly induced in both the culture systems with higher p-values and z-scores. An increase in the expression level of genes related to the pathways was observed over time. All pathways are commonly associated with a manifestation of pro-inflammatory cytokines and early immune responses. However, the Peroxisome proliferator-activation receptor (PPAR) signaling and Liver X Receptor/Retinoid X Receptor (LXR/RXR) signaling associated with lipid metabolism were reduced. These results indicate that early immune responses might be highly activated in B. canis infection. Therefore, these results might suggest clues to reveal the early immune response of the canine to B. canis infection, particularly TLR signaling.
Collapse
Affiliation(s)
- Woo Bin Park
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University, Seoul, South Korea
- BK21 Four Future Veterinary Medicine Leading Education and Research Center, Seoul National University, Seoul, South Korea
| | - Suji Kim
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University, Seoul, South Korea
- BK21 Four Future Veterinary Medicine Leading Education and Research Center, Seoul National University, Seoul, South Korea
| | - Soojin Shim
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University, Seoul, South Korea
| | - Han Sang Yoo
- Department of Infectious Diseases, College of Veterinary Medicine, Seoul National University, Seoul, South Korea
- BK21 Four Future Veterinary Medicine Leading Education and Research Center, Seoul National University, Seoul, South Korea
- Research Institute for Veterinary Science, Seoul National University, Seoul, South Korea
- BioMax/N-Bio Institute, Seoul National University, Seoul, South Korea
| |
Collapse
|
12
|
Seo DH, Che X, Kim S, Kim DH, Ma HW, Kim JH, Kim TI, Kim WH, Kim SW, Cheon JH. Triggering Receptor Expressed on Myeloid Cells-1 Agonist Regulates Intestinal Inflammation via Cd177 + Neutrophils. Front Immunol 2021; 12:650864. [PMID: 33767714 PMCID: PMC7985452 DOI: 10.3389/fimmu.2021.650864] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Accepted: 02/16/2021] [Indexed: 12/18/2022] Open
Abstract
Triggering receptor expressed on myeloid cell-1 (TREM-1) signaling is expressed on neutrophils and monocytes that is necessary for the successful antimicrobial response and resolution of inflammation in the gut. In this study, we determined the effect of an anti-TREM-1 agonistic antibody (α-TREM-1) on colitis and identify its underlying mechanism of action. Administration of α-TREM-1 alleviated colitis in mice and resolved dysbiosis, which required TLR4/Myd88 signaling. α-TREM-1 increased the production of neutrophil extracellular traps and interleukin-22 by CD177+ neutrophils, which led to pathogen clearance and protection of the intestinal barrier. TREM-1 activation using an α-TREM-1 antibody protects against colitis by rebalancing the microbiota and protecting the epithelium against the immune response as well as modulates the function of neutrophils and macrophages. These results highlight the importance of the TREM-1 pathway in intestinal homeostasis and suggest that α-TREM-1 treatment may be an effective therapeutic strategy for inflammatory bowel disease.
Collapse
Affiliation(s)
- Dong Hyuk Seo
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Xiumei Che
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Soochan Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
| | - Da Hye Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
| | - Hyun Woo Ma
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Jae Hyeon Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
| | - Tae Il Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
| | - Won Ho Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
| | - Seung Won Kim
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Jae Hee Cheon
- Department of Internal Medicine and Institute of Gastroenterology, Yonsei University College of Medicine, Seoul, South Korea
- Brain Korea 21 PLUS Project for Medical Science, Yonsei University College of Medicine, Seoul, South Korea
- Severance Biomedical Science Institute, Yonsei University College of Medicine, Seoul, South Korea
| |
Collapse
|
13
|
Zheng Y, Yue C, Zhang H, Chen H, Liu Y, Li J. Deoxycholic Acid and Lithocholic Acid Alleviate Liver Injury and Inflammation in Mice with Klebsiella pneumoniae-Induced Liver Abscess and Bacteremia. J Inflamm Res 2021; 14:777-789. [PMID: 33727851 PMCID: PMC7955870 DOI: 10.2147/jir.s298495] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Accepted: 02/13/2021] [Indexed: 12/19/2022] Open
Abstract
Purpose Klebsiella pneumoniae-induced liver abscess and baiacterem is a serious infectious disease with high mortality. Secondary bile acids (SBAs) are produced by intestinal flora through the metabolism of primary bile acids and play a role in promoting or inhibiting inflammation in some diseases. However, the immunomodulatory role of SBAs in bacterial infections of the liver remains unclear. This study aimed to investigate the anti-inflammatory and liver-protective effects of SBAs in K. pneumoniae-infected mice. Methods The absolute concentrations of deoxycholic acid (DCA) and lithocholic acid (LCA) in feces and serum were analyzed, and intestinal flora alterations between K. pneumoniae-infected and healthy control mice were examined. The effect of SBAs was investigated by analyzing the survival, tissue bacterial load, histopathology, and inflammatory factor levels in SBA-treated mice. The expression of crucial proteins implicated in the NF-κB pathway, as well as the G-protein-coupled bile acid receptor TGR5, was detected. Results The content of SBAs in feces and serum of the K. pneumoniae-infected group was significantly reduced, and significant changes in the composition of the intestinal flora were detected. The intestinal flora are directly related to the synthesis of SBAs. Ruminococcaceae levels in K. pneumoniae-infected mice were significantly lower than in healthy control mice. Oral administration of SBAs improved the survival and liver pathology of K. pneumoniae-infected mice, and reduced the bacterial load and the level of inflammatory factors. SBAs down-regulated the expression of key proteins in the NF-κB inflammatory signaling pathway, including the phosphorylation of IκBα and NF-κB p50 and the nuclear translocation of NF-κB p65. The protective effect of SBAs may be dependent on high TGR5 expression. Conclusion SBAs downregulate the NF-κB inflammatory signaling pathway through TGR5, protecting the liver and inhibiting inflammation in K. pneumoniae-induced liver abscess and bacteremia.
Collapse
Affiliation(s)
- Yahong Zheng
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Chengcheng Yue
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Hui Zhang
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Haoran Chen
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Yanyan Liu
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China
| | - Jiabin Li
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China.,Department of Infectious Diseases, The Chaohu Affiliated Hospital of Anhui Medical University, Hefei, People's Republic of China.,Anhui Center for Surveillance of Bacterial Resistance, Hefei, People's Republic of China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, People's Republic of China
| |
Collapse
|
14
|
Surface TREM-1 as a Prognostic Biomarker in Pediatric Sepsis. Indian J Pediatr 2021; 88:134-140. [PMID: 32572693 DOI: 10.1007/s12098-020-03355-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 05/14/2020] [Indexed: 01/07/2023]
Abstract
OBJECTIVES To investigate the association between the triggering receptor expressed on myeloid cells-1 (TREM-1) levels and prognosis in septic children. METHODS Patients admitted to pediatric intensive care units (PICU) of three tertiary centers were included in this prospective observational study. Serum samples were taken at admission from patients who were hospitalized with sepsis. RESULTS Of the 87 patients included, 34 (39.1%) had severe sepsis and 53 (60.9%) had septic shock. The median age was 2 y (2 mo to 16 y). TREM-1 values were found to be significantly higher in septic shock patients 129 pg/ml (min 9.85- max 494.90) compared to severe sepsis 105 pg/ml (min 8.21- max 289.17) (p = 0.048). Despite higher TREM-1 levels been measured in non-survivors compared to survivors, it was not statistically significant [168.98 pg/ml (min 9.85- max 494.90) vs. 110.79 pg/ml (min 8.21- max 408.90), (p = 0.075)]. CONCLUSIONS Admission TREM-1 levels were higher in septic shock compared to severe sepsis patients. There was no association between mortality and TREM-1 levels in sepsis. TREM-1 measurements should be used carefully in pediatric sepsis prognosis.
Collapse
|
15
|
Matos ADO, Dantas PHDS, Silva-Sales M, Sales-Campos H. TREM-1 isoforms in bacterial infections: to immune modulation and beyond. Crit Rev Microbiol 2021; 47:290-306. [PMID: 33522328 DOI: 10.1080/1040841x.2021.1878106] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
The triggering receptor expressed on myeloid cells 1 (TREM-1) is an innate immunity receptor associated with the amplification of inflammation in sterile and non-sterile inflammatory disorders. Since its first description, the two isoforms of the receptor, membrane and soluble (mTREM-1 and sTREM-1, respectively) have been largely explored in the immunopathogenesis of several bacterial diseases and sepsis. The role of the receptor in these scenarios seems to be at least partly dependent on the source/type of bacteria, host and context. As uncontrolled inflammation is a result of several bacterial infections, the inhibition of the receptor has been considered as a promising approach to treat such conditions. Further, sTREM-1 has been explored as a biomarker for diagnosis and/or prognosis of several bacterial diseases. Therefore, this review aims to provide an updated insight into how the receptor influences and is influenced by bacterial infections, highlighting the advances regarding the use/manipulation of TREM-1 isoforms in biomedical research and clinical practice.
Collapse
Affiliation(s)
| | | | - Marcelle Silva-Sales
- Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiânia, Brazil
| | | |
Collapse
|
16
|
Wang J, Li Q, Yin Y, Zhang Y, Cao Y, Lin X, Huang L, Hoffmann D, Lu M, Qiu Y. Excessive Neutrophils and Neutrophil Extracellular Traps in COVID-19. Front Immunol 2020; 11:2063. [PMID: 33013872 PMCID: PMC7461898 DOI: 10.3389/fimmu.2020.02063] [Citation(s) in RCA: 175] [Impact Index Per Article: 43.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Accepted: 07/29/2020] [Indexed: 12/22/2022] Open
Abstract
Background: Cases of excessive neutrophil counts in the blood in severe coronavirus disease (COVID-19) patients have drawn significant attention. Neutrophil infiltration was also noted on the pathological findings from autopsies. It is urgent to clarify the pathogenesis of neutrophils leading to severe pneumonia in COVID-19. Methods: A retrospective analysis was performed on 55 COVID-19 patients classified as mild (n = 22), moderate (n = 25), and severe (n = 8) according to the Guidelines released by the National Health Commission of China. Trends relating leukocyte counts and lungs examined by chest CT scan were quantified by Bayesian inference. Transcriptional signatures of host immune cells of four COVID19 patients were analyzed by RNA sequencing of lung specimens and BALF. Results: Neutrophilia occurred in 6 of 8 severe patients at 7-19 days after symptom onset, coinciding with lesion progression. Increasing neutrophil counts paralleled lesion CT values (slope: 0.8 and 0.3-1.2), reflecting neutrophilia-induced lung injury in severe patients. Transcriptome analysis revealed that neutrophil activation was correlated with 17 neutrophil extracellular trap (NET)-associated genes in COVID-19 patients, which was related to innate immunity and interacted with T/NK/B cells, as supported by a protein-protein interaction network analysis. Conclusion: Excessive neutrophils and associated NETs could explain the pathogenesis of lung injury in COVID-19 pneumonia.
Collapse
Affiliation(s)
- Jun Wang
- Center of Clinical Laboratory, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
- Bioinformatics and Computational Biophysics, University of Duisburg-Essen, Essen, Germany
- Institute of Virology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
| | - Qian Li
- Institute of Virology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
- Department of Laboratory Medicine, Maternal and Child Health Hospital of Hubei Province, Wuhan, China
| | - Yongmei Yin
- Radiology Department, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
| | - Yingying Zhang
- Center of Clinical Laboratory, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
| | - Yingying Cao
- Bioinformatics and Computational Biophysics, University of Duisburg-Essen, Essen, Germany
| | - Xiaoming Lin
- Radiology Department, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
| | - Lihua Huang
- Center of Clinical Laboratory, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
- Department of Infectious Diseases, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
| | - Daniel Hoffmann
- Bioinformatics and Computational Biophysics, University of Duisburg-Essen, Essen, Germany
| | - Mengji Lu
- Institute of Virology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
| | - Yuanwang Qiu
- Center of Clinical Laboratory, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
- Radiology Department, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
- Department of Infectious Diseases, The Fifth People's Hospital of Wuxi, Jiangnan University, Wuxi, China
| |
Collapse
|
17
|
CelB is a suitable marker for rapid and specific identification of Klebsiella pneumoniae by the loop-mediated isothermal amplification (LAMP) assay. Braz J Microbiol 2019; 50:961-967. [PMID: 31456171 DOI: 10.1007/s42770-019-00144-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 08/15/2019] [Indexed: 01/20/2023] Open
Abstract
Klebsiella pneumoniae belongs to Enterobacteriaceae, which is the commonest bacterium causing nosocomial respiratory tract infection. It ranks second in bacteremia and urinary tract infection in gram-negative bacteria. Therefore, the rapid and accurate identification of K. pneumoniae was of great significance for the guide of clinical medication, and timely treatment of patients. The purpose of this study was to establish a rapid and sensitive molecular detection method for K. pneumoniae based on loop-mediated isothermal amplification (LAMP) technology. Firstly, local BLAST and NCBI BLAST were used to analyze the genome of K. pneumoniae. According to the principle of interspecific and intraspecific specificity, CelB (GenBank ID 11847805) was selected as the specific gene. Then, the LAMP and PCR identification systems were established with this target gene. Thirty-six clinical isolates of K. pneumoniae and 50 non-K. pneumoniae were used for the specific evaluation, and both LAMP and PCR could specifically distinguish K. pneumoniae from non-K. pneumoniae. A 10-fold series diluted positive plasmids and simulated infected blood samples were used as the templates in the sensitivity assay, and the results showed that the sensitivity could reach 1 copy/reaction. In summary, a rapid, specific, and sensitive LAMP method was established to detect K. pneumoniae in clinics.
Collapse
|
18
|
Yang FC, Chiu PY, Chen Y, Mak TW, Chen NJ. TREM-1-dependent M1 macrophage polarization restores intestinal epithelium damaged by DSS-induced colitis by activating IL-22-producing innate lymphoid cells. J Biomed Sci 2019; 26:46. [PMID: 31189465 PMCID: PMC6560756 DOI: 10.1186/s12929-019-0539-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2019] [Accepted: 05/28/2019] [Indexed: 01/10/2023] Open
Abstract
BACKGROUND Triggering receptor expressed on myeloid cells-1 (TREM-1) is highly expressed on macrophages in inflamed intestines and reportedly promotes inflammatory bowel disease (IBD) by augmenting pro-inflammatory responses. To study the mechanism mediated by TREM-1 on macrophages, we generated an independent TREM-1 deficient mouse. METHODS Acute colitis was induced in C57BL/6 and TREM-1-deficient mice by the administration of dextran sodium sulfate (DSS). Colonic lamina propria immune cell composition and cytokines were analyzed. An innate lymphoid cell (ILC) co-culture experiment with macrophages was used to analyze IL-22 levels. Exogenous IL-22 and TREM-1-expressing macrophages were supplied to TREM-1-deficient mice for examining their effects on intestinal barrier integrity. RESULTS In inflamed colons, TREM-1 loss compromised the activation of ILC3 and their production of IL-22, which is required for intestinal barrier integrity. ILC3-mediated IL-22 production depends on IL-1β secreted by M1-polarized macrophages, and we found that TREM-1 deficiency results in a decreased number of IL-1β producing-M1 macrophages in colons exposed to DSS. Accordingly, DSS-mediated damage was ameliorated by supplying exogenous IL-22 and TREM-1-expressing macrophages to TREM-1-deficient mice. CONCLUSIONS TREM-1 plays a crucial role in regulating IL-22 production by ILC3 through modulating M1-macrophage polarization during DSS-induced acute colitis.
Collapse
Affiliation(s)
- Fu-Chen Yang
- Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, No.155, Sec.2, Linong Street, Taipei, Taiwan
| | - Po-Yuan Chiu
- Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, No.155, Sec.2, Linong Street, Taipei, Taiwan
| | - Yun Chen
- Department of Surgery, Far Eastern Memorial Hospital, New Taipei City, Taiwan
| | - Tak W. Mak
- The Campbell Family Institute for Breast Cancer Research, Ontario Cancer Institute, University Health Network and Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2C1 Canada
| | - Nien-Jung Chen
- Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, No.155, Sec.2, Linong Street, Taipei, Taiwan
- Cancer Progression Research Center, National Yang-Ming University, Taipei, Taiwan
| |
Collapse
|
19
|
Han L, Fu L, Peng Y, Zhang A. Triggering Receptor Expressed on Myeloid Cells-1 Signaling: Protective and Pathogenic Roles on Streptococcal Toxic-Shock-Like Syndrome Caused by Streptococcus suis. Front Immunol 2018; 9:577. [PMID: 29619033 PMCID: PMC5871666 DOI: 10.3389/fimmu.2018.00577] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2017] [Accepted: 03/07/2018] [Indexed: 12/15/2022] Open
Abstract
Streptococcus suis infections can cause septic shock, which is referred to as streptococcal toxic-shock-like syndrome (STSLS). The disease is characterized by a severe inflammatory response, multiple organ failure, and high mortality. However, no superantigen that is responsible for toxic shock syndrome was detected in S. suis, indicating that the mechanism underlying STSLS is different and remains to be elucidated. Triggering receptor expressed on myeloid cells-1 (TREM-1), belonging to the Ig superfamily, is an activating receptor expressed on myeloid cells, and has been recognized as a critical immunomodulator in several inflammatory diseases of both infectious and non-infectious etiologies. In this review, we discuss the current understanding of the immunoregulatory functions of TREM-1 on acute infectious diseases and then highlight the crucial roles of TREM-1 on the development of STSLS.
Collapse
Affiliation(s)
- Li Han
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Lei Fu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China.,International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
| | - Yongbo Peng
- Institute for Medical Biology, Hubei Provincial Key Laboratory for Protection and Application of Special Plants in Wuling Area of China, College of Life Sciences, South-Central University for Nationalities, Wuhan, China
| | - Anding Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China.,International Research Center for Animal Disease, Ministry of Science and Technology, Wuhan, China
| |
Collapse
|
20
|
Rudick CP, Cornell DL, Agrawal DK. Single versus combined immunoregulatory approach using PD-1 and CTLA-4 modulators in controlling sepsis. Expert Rev Clin Immunol 2017; 13:907-919. [PMID: 28742984 PMCID: PMC6098684 DOI: 10.1080/1744666x.2017.1357469] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
INTRODUCTION Sepsis is a disease process characterized by an extreme inflammatory response followed by a period of severe immunosuppression. In recent years, there has been improved survival in the initial immune response during systemic inflammatory response syndrome, and compensatory anti-inflammatory response, yet is mostly unchanged with 18-30% mortality during the later stage of sepsis despite numerous Phase 3 clinical trials. Areas covered: This review article presents a critical evaluation of the most promising newer studies aimed at improving the immunosuppressive stage of sepsis. Administration of DHEA/AED/AET show promise in improving survival. Blockade of signaling pathways for PD-1/PD-L1/CTLA-4, and partial blockade of TREM-1 signaling, and modification to sTREM-1 and the JAK/STAT pathway are promising methods of restoring host immune response and improving survival. While there has been significant progress, currently no findings have been translated into effective clinical interventions. Expert commentary: Clinical success by immunomodulation with individual immune mediator is encouraging and should progress to evaluating combined methods of immunoregulation. Since most of the animal studies do not reproduce human sepsis, development of better animal models and moving toward human studies for intervention will lead to the most beneficial findings in translational science.
Collapse
Affiliation(s)
| | - David L. Cornell
- Department of Surgery, Creighton University School of Medicine, Omaha, NE, USA
| | | |
Collapse
|
21
|
Fu L, Han L, Xie C, Li W, Lin L, Pan S, Zhou Y, Li Z, Jin M, Zhang A. Identification of Extracellular Actin As a Ligand for Triggering Receptor Expressed on Myeloid Cells-1 Signaling. Front Immunol 2017; 8:917. [PMID: 28824642 PMCID: PMC5545922 DOI: 10.3389/fimmu.2017.00917] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 07/18/2017] [Indexed: 12/16/2022] Open
Abstract
Triggering receptor expressed on myeloid cells-1 (TREM-1) is a potent amplifier of pro-inflammatory innate immune reactions, and it is an essential mediator of death in sepsis. However, the ligand for TREM-1 has not been fully identified. Previous research identified a natural ligand of TREM-1 distributed on platelets that contributed to the development of sepsis. However, the exact signal for TREM-1 recognition remains to be identified. Here, we identified actin as a TREM-1-interacting protein on platelets and found that recombinant actin could interact with recombinant TREM-1 extracellular domain directly. Furthermore, actin co-localized with TREM-1 on the surface of activated mouse macrophage RAW264.7 cells interacting with platelets. In addition, recombinant actin could enhance the inflammatory response of macrophages from wt mice but not from trem1-/- mice, and the enhancement could be inhibited by LP17 (a TREM-1 inhibitor) in a dose-dependent manner. Importantly, extracellular actin showed co-localization with TREM-1 in lung tissue sections from septic mice, which suggested that TREM-1 recognized actin during activation in sepsis. Therefore, the present study identified actin as a new ligand for TREM-1 signaling, and it also provided a link between both essential regulators of death in sepsis.
Collapse
Affiliation(s)
- Lei Fu
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - Li Han
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Caiyun Xie
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - Wenke Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Lan Lin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - Shan Pan
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - You Zhou
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China
| | - Zhi Li
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - Meilin Jin
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| | - Anding Zhang
- State Key Laboratory of Agricultural Microbiology, College of Veterinary Medicine, Huazhong Agricultural University, Wuhan, China.,The Cooperative Innovation Center for Sustainable Pig Production, International Joint Research Center for Animal Disease Control, Wuhan, China.,Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Wuhan, China
| |
Collapse
|
22
|
Liu CJ, Tsai CY, Chiang SH, Tang SJ, Chen NJ, Mak TW, Sun GH, Sun KH. Triggering receptor expressed on myeloid cells-1 (TREM-1) deficiency augments BAFF production to promote lupus progression. J Autoimmun 2017; 78:92-100. [DOI: 10.1016/j.jaut.2016.12.010] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2016] [Revised: 12/21/2016] [Accepted: 12/29/2016] [Indexed: 11/30/2022]
|
23
|
Miller SE, Bell CS, McClain MS, Cover TL, Giorgio TD. Dynamic Computational Model of Symptomatic Bacteremia to Inform Bacterial Separation Treatment Requirements. PLoS One 2016; 11:e0163167. [PMID: 27657881 PMCID: PMC5033423 DOI: 10.1371/journal.pone.0163167] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 09/02/2016] [Indexed: 11/21/2022] Open
Abstract
The rise of multi-drug resistance has decreased the effectiveness of antibiotics, which has led to increased mortality rates associated with symptomatic bacteremia, or bacterial sepsis. To combat decreasing antibiotic effectiveness, extracorporeal bacterial separation approaches have been proposed to capture and separate bacteria from blood. However, bacteremia is dynamic and involves host-pathogen interactions across various anatomical sites. We developed a mathematical model that quantitatively describes the kinetics of pathogenesis and progression of symptomatic bacteremia under various conditions, including bacterial separation therapy, to better understand disease mechanisms and quantitatively assess the biological impact of bacterial separation therapy. Model validity was tested against experimental data from published studies. This is the first multi-compartment model of symptomatic bacteremia in mammals that includes extracorporeal bacterial separation and antibiotic treatment, separately and in combination. The addition of an extracorporeal bacterial separation circuit reduced the predicted time of total bacteria clearance from the blood of an immunocompromised rodent by 49%, compared to antibiotic treatment alone. Implementation of bacterial separation therapy resulted in predicted multi-drug resistant bacterial clearance from the blood of a human in 97% less time than antibiotic treatment alone. The model also proposes a quantitative correlation between time-dependent bacterial load among tissues and bacteremia severity, analogous to the well-known ‘area under the curve’ for characterization of drug efficacy. The engineering-based mathematical model developed may be useful for informing the design of extracorporeal bacterial separation devices. This work enables the quantitative identification of the characteristics required of an extracorporeal bacteria separation device to provide biological benefit. These devices will potentially decrease the bacterial load in blood. Additionally, the devices may achieve bacterial separation rates that allow consequent acceleration of bacterial clearance in other tissues, inhibiting the progression of symptomatic bacteremia, including multi-drug resistant variations.
Collapse
Affiliation(s)
- Sinead E. Miller
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Charleson S. Bell
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, United States of America
| | - Mark S. McClain
- Department of Medicine, Division of Infectious Disease, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
| | - Timothy L. Cover
- Department of Medicine, Division of Infectious Disease, Vanderbilt University Medical Center, Nashville, Tennessee, United States of America
- Veterans Affairs Tennessee Valley Healthcare System, Nashville, Tennessee, United States of America
| | - Todd D. Giorgio
- Department of Biomedical Engineering, Vanderbilt University, Nashville, Tennessee, United States of America
- * E-mail:
| |
Collapse
|
24
|
Weehuizen TAF, Hommes TJ, Lankelma JM, de Jong HK, Roelofs JJ, de Vos AF, Colonna M, van der Poll T, Wiersinga WJ. Triggering Receptor Expressed on Myeloid Cells (TREM)-2 Impairs Host Defense in Experimental Melioidosis. PLoS Negl Trop Dis 2016; 10:e0004747. [PMID: 27253382 PMCID: PMC4890812 DOI: 10.1371/journal.pntd.0004747] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2016] [Accepted: 05/07/2016] [Indexed: 12/22/2022] Open
Abstract
Background Triggering receptor expressed on myeloid cells (TREM) -1 and TREM-2 are key regulators of the inflammatory response that are involved in the clearance of invading pathogens. Melioidosis, caused by the "Tier 1" biothreat agent Burkholderia pseudomallei, is a common form of community-acquired sepsis in Southeast-Asia. TREM-1 has been suggested as a biomarker for sepsis and melioidosis. We aimed to characterize the expression and function of TREM-1 and TREM-2 in melioidosis. Methodology/Principal Findings Wild-type, TREM-1/3 (Trem-1/3-/-) and TREM-2 (Trem-2-/-) deficient mice were intranasally infected with live B. pseudomallei and killed after 24, and/or 72 h for the harvesting of lungs, liver, spleen, and blood. Additionally, survival studies were performed. Cellular functions were further analyzed by stimulation and/or infection of isolated cells. TREM-1 and TREM-2 expression was increased both in the lung and liver of B. pseudomallei-infected mice. Strikingly, Trem-2-/-, but not Trem-1/3-/-, mice displayed a markedly improved host defense as reflected by a strong survival advantage together with decreased bacterial loads, less inflammation and reduced organ injury. Cellular responsiveness of TREM-2, but not TREM-1, deficient blood and bone-marrow derived macrophages (BMDM) was diminished upon exposure to B. pseudomallei. Phagocytosis and intracellular killing of B. pseudomallei by BMDM and alveolar macrophages were TREM-1 and TREM-2-independent. Conclusions/Significance We found that TREM-2, and to a lesser extent TREM-1, plays a remarkable detrimental role in the host defense against a clinically relevant Gram-negative pathogen in mice: TREM-2 deficiency restricts the inflammatory response, thereby decreasing organ damage and mortality. Triggering receptor expressed on myeloid cells (TREM)-1 and -2 are receptors on immune cells that act as mediators of the innate immune response. It is thought that TREM-1 amplifies the immune response, while TREM-2 acts as a negative regulator. Previously, we found that TREM-1 is upregulated in melioidosis patients. In contrast, nothing is known on TREM-2 expression and its role in melioidosis. In this study we examined the expression and functional role of both TREM-1 and -2 in a murine melioidosis model. We found that TREM-1 and-2 expression was upregulated during melioidosis. Using our experimental melioidosis model, we observed that Trem-2-/- mice were protected against B.pseudomallei-induced lethality. Trem-2-/- mice demonstrated reduced bacterial loads, inflammation and organ damage compared to wild-type mice in experimental melioidosis. Despite reduced bacterial dissemination of B.pseudomallei to distant organs in Trem-1/3-/ mice-, no differences in survival were found between Trem-1/3-/- and wild-type mice during melioidosis. Lastly, we investigated cellular functions of TREM-1 and TREM-2 and found that TREM-2 deficiency led to decreased cellular responsiveness to B. pseudomallei infection. In conclusion, we found that TREM-2 plays an important role during experimental murine melioidosis. TREM-2-deficiency reduces inflammation and organ damage, thereby improving survival.
Collapse
Affiliation(s)
- Tassili A. F. Weehuizen
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
- * E-mail: ;
| | - Tijmen J. Hommes
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
| | - Jacqueline M. Lankelma
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
| | - Hanna K. de Jong
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
| | | | - Alex F. de Vos
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
| | - Marco Colonna
- Department of Pathology, Washington University in St. Louis, St. Louis, Missouri, United States of America
| | - Tom van der Poll
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
- Department of Medicine, Division of Infectious Diseases, Academic Medical Center, Amsterdam, the Netherlands
| | - W. Joost Wiersinga
- Center for Infection and Immunity Amsterdam (CINIMA), Academic Medical Center, Amsterdam, the Netherlands
- Center for Experimental and Molecular Medicine (CEMM), Academic Medical Center, Amsterdam, the Netherlands
- Department of Medicine, Division of Infectious Diseases, Academic Medical Center, Amsterdam, the Netherlands
| |
Collapse
|
25
|
Yang C, Zhao J, Lin L, Pan S, Fu L, Han L, Jin M, Zhou R, Zhang A. Targeting TREM-1 Signaling in the Presence of Antibiotics is Effective Against Streptococcal Toxic-Shock-Like Syndrome (STSLS) Caused by Streptococcus suis. Front Cell Infect Microbiol 2015; 5:79. [PMID: 26618144 PMCID: PMC4641895 DOI: 10.3389/fcimb.2015.00079] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2015] [Accepted: 10/29/2015] [Indexed: 11/13/2022] Open
Abstract
Streptococcus suis (S.suis), a major swine pathogen, is also a severe threat to human health. Infection with highly virulent strains of S. suis can cause human Streptococcal toxic-shock-like syndrome (STSLS), which is associated with high serum pro-inflammatory cytokine levels and a high mortality rate. Our previous study indicated that highly virulent S. suis infection could activate the TREM-1 signaling pathway, which promotes host clearance of S. suis during early infection. However, it remained to be elicited whether TREM-1 signaling could be a target against STSLS in the presence of antibiotic. In the present study, mice were infected with a highly virulent S. suis strain and then treated with rTREM-1 (the recombinant extracellular domain of TREM-1) to block TREM-1 signaling, antibiotics, both rTREM-1 and antibiotics, or PBS. The survival rates, clinical signs, serum IL-1β and TNF-α levels, and serum bacterial loads were evaluated. Treatment with rTREM-1 could aggravate the outcome of infection as described previously. Although the conventional treatment with antibiotics contributed to effective S. suis clearance, it did not improve survival significantly. In comparison, due to the reduction of the exaggerated pro-inflammatory response, treatment combined with rTREM-1 and antibiotics not only led to efficient bacterial clearance but also alleviated inflammation. In conclusion, TREM-1 signaling contributed to severe inflammatory response and benefited S. suis clearance. Therefore, blocking TREM-1 signaling could still be a target for the treatment of STSLS in the presence of antibiotics.
Collapse
Affiliation(s)
- Chao Yang
- National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University Wuhan, China ; College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Jianqing Zhao
- National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University Wuhan, China ; College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Lan Lin
- College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Shan Pan
- College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Lei Fu
- College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Li Han
- College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Meilin Jin
- National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University Wuhan, China ; College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China
| | - Rui Zhou
- National Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University Wuhan, China ; College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China ; The Cooperative Innovation Center for Sustainable Pig Production, Huazhong Agricultural University Wuhan, China
| | - Anding Zhang
- College of Veterinary Medicine, Huazhong Agricultural University Wuhan, China ; Key Laboratory of Development of Veterinary Diagnostic Products, Ministry of Agriculture, Huazhong Agricultural University Wuhan, China
| |
Collapse
|
26
|
TREM-1 signaling promotes host defense during the early stage of infection with highly pathogenic Streptococcus suis. Infect Immun 2015; 83:3293-301. [PMID: 26056380 DOI: 10.1128/iai.00440-15] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2015] [Accepted: 05/20/2015] [Indexed: 01/18/2023] Open
Abstract
Infection with highly pathogenic Streptococcus suis can cause septic shock, which is characterized by high levels of inflammatory cytokines and a high mortality rate. Our previous study indicated that TREM-1 (triggering receptor expressed on myeloid cells 1) was upregulated in swine spleen cells in response to S. suis infection. The role of TREM-1 signaling in enhancement of the proinflammatory response promoted us to examine its effect on the outcome of S. suis infection. In the present study, the recombinant extracellular domain of TREM-1 (rTREM-1) and an agonistic TREM-1 antibody were used to inhibit and activate TREM-1 signaling to evaluate its role in neutrophil activation, pathogen clearance, proinflammatory cytokine response, and the outcome of highly pathogenic S. suis infection in a mouse model. Blockage of TREM-1 signaling caused a more severe proinflammatory response to S. suis infection and increased the mortality rate, while its activation had the opposite effect. Blockage or activation of TREM-1 signaling lowered or raised the number of neutrophils in the blood, which correlated well with host clearance of S. suis. In conclusion, the TREM-1-mediated innate immune response played an essential role in the activation of neutrophils and S. suis clearance, which further reduced severe inflammation and finally benefited the outcome of the infection.
Collapse
|
27
|
Abstract
Intestinal mucosal barrier function is the capacity of the intestine to provide adequate containment of luminal microorganisms and molecules while preserving the ability to absorb nutrients. The central element is the epithelial layer, which physically separates the lumen and the internal milieu and is in charge of vectorial transport of ions, nutrients, and other substances. The secretion of mucus-forming mucins, sIgA, and antimicrobial peptides reinforces the mucosal barrier on the extraepithelial side, while a variety of immune cells contributes to mucosal defense in the inner side. Thus, the mucosal barrier is of physical, biochemical, and immune nature. In addition, the microbiota may be viewed as part of this system because of the mutual influence occurring between the host and the luminal microorganisms. Alteration of the mucosal barrier function with accompanying increased permeability and/or bacterial translocation has been linked with a variety of conditions, including inflammatory bowel disease. Genetic and environmental factors may converge to evoke a defective function of the barrier, which in turn may lead to overt inflammation of the intestine as a result of an exacerbated immune reaction toward the microbiota. According to this hypothesis, inflammatory bowel disease may be both precipitated and treated by either stimulation or downregulation of the different elements of the mucosal barrier, with the outcome depending on timing, the cell type affected, and other factors. In this review, we cover briefly the elements of the barrier and their involvement in functional defects and the resulting phenotype.
Collapse
|
28
|
Roe K, Gibot S, Verma S. Triggering receptor expressed on myeloid cells-1 (TREM-1): a new player in antiviral immunity? Front Microbiol 2014; 5:627. [PMID: 25505454 PMCID: PMC4244588 DOI: 10.3389/fmicb.2014.00627] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2014] [Accepted: 11/03/2014] [Indexed: 11/25/2022] Open
Abstract
The triggering receptor expressed on myeloid cells (TREM) family of protein receptors is rapidly emerging as a critical regulator of a diverse array of cellular functions, including amplification of inflammation. Although the ligand(s) for TREM have not yet been fully identified, circumstantial evidence indicates that danger- and pathogen-associated molecular patterns (DAMPs and PAMPs) can induce cytokine production via TREM-1 activation. The discovery of novel functions of TREM, such as regulation of T-cell proliferation and activation of antigen-presenting cells, suggests a larger role of TREM proteins in modulation of host immune responses to microbial pathogens, such as bacteria and fungi. However, the significance of TREM signaling in innate immunity to virus infections and the underlying mechanisms remain largely unclear. The nature and intensity of innate immune responses, specifically production of type I interferon and inflammatory cytokines is a crucial event in dictating recovery vs. adverse outcomes from virus infections. In this review, we highlight the emerging roles of TREM-1, including synergy with classical pathogen recognition receptors. Based on the literature using viral PAMPs and other infectious disease models, we further discuss how TREM-1 may influence host-virus interactions and viral pathogenesis. A deeper conceptual understanding of the mechanisms associated with pathogenic and/or protective functions of TREM-1 in antiviral immunity is essential to develop novel therapeutic strategies for the control of virus infection by modulating innate immune signaling.
Collapse
Affiliation(s)
- Kelsey Roe
- Department of Tropical Medicine, Medical Microbiology and Pharmacology, John A. Burns School of Medicine, University of Hawaii at Manoa Honolulu, HI, USA
| | - Sébastien Gibot
- Service de Réanimation Médicale, University Hospital of Nancy Nancy, France
| | - Saguna Verma
- Department of Tropical Medicine, Medical Microbiology and Pharmacology, John A. Burns School of Medicine, University of Hawaii at Manoa Honolulu, HI, USA
| |
Collapse
|
29
|
Genua M, Rutella S, Correale C, Danese S. The triggering receptor expressed on myeloid cells (TREM) in inflammatory bowel disease pathogenesis. J Transl Med 2014; 12:293. [PMID: 25347935 PMCID: PMC4231187 DOI: 10.1186/s12967-014-0293-z] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2014] [Accepted: 10/09/2014] [Indexed: 01/29/2023] Open
Abstract
The Triggering Receptors Expressed on Myeloid cells (TREM) are a family of cell-surface molecules that control inflammation, bone homeostasis, neurological development and blood coagulation. TREM-1 and TREM-2, the best-characterized receptors so far, play divergent roles in several infectious diseases. In the intestine, TREM-1 is highly expressed by macrophages, contributing to inflammatory bowel disease (IBD) pathogenesis. Contrary to current understanding, TREM-2 also promotes inflammation in IBD by fueling dendritic cell functions. This review will focus specifically on recent insights into the role of TREM proteins in IBD development, and discuss opportunities for novel treatment approaches.
Collapse
Affiliation(s)
- Marco Genua
- IBD Center, Humanitas Clinical and Research Hospital, Rozzano, Italy.
| | - Sergio Rutella
- Division of Translational Medicine, Research Branch, Sidra Medical & Research Center, Doha, Qatar.
| | - Carmen Correale
- IBD Center, Humanitas Clinical and Research Hospital, Rozzano, Italy.
| | - Silvio Danese
- IBD Center, Humanitas Clinical and Research Hospital, Rozzano, Italy.
| |
Collapse
|
30
|
Chen N, Wang LL, Xue J, Ma XB, Zhao S, Rong RX, Li HQ, Ding L, Zheng MZ, Chen YY, Duan F, Shen YL. Different metabolic profiles of K1 serotype and non-serotype K1 and K2 Klebsiella pneumoniae isolates in oral infection mice model. Microb Pathog 2014; 75:41-8. [PMID: 25173421 DOI: 10.1016/j.micpath.2014.08.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Revised: 08/13/2014] [Accepted: 08/18/2014] [Indexed: 11/28/2022]
Abstract
K1 or K2 serotype Klebsiella pneumoniae isolate caused clinical pyogenic liver abscess (KLA) infection is prevalent in many areas. It has been identified that K1 or K2 serotype K. pneumoniae isolates caused KLA infection in mice by oral inoculation. In our study, K1 serotype K. pneumoniae isolate Kp1002 with hypermucoviscosity (HV)-positive phenotype caused KLA infection in C57BL/6 mice by oral inoculation. Simultaneously, non-serotype K1 and K2 isolate Kp1014 with HV-negative phenotype failed to cause KLA infection in the same manner. It seems that gastrointestinal tract translocation is the pathway by which K1 or K2 serotype K. pneumoniae caused KLA infection. Liquid chromatography-tandem mass spectrometry was used to further analyze metabolic profile changes in mice with KLA infection. Data showed that after Kp1002 or Kp1014 oral inoculation, serum Phosphatidylcholine (PC) and Lysophosphatidylcholine (LPC) levels significantly changed in mice. Some PC and LPC molecules showed changes both in the Kp1002 KLA group and the Kp1014 no-KLA group compared with the control group. The level of 18:1/18:2-PC significantly changed in the Kp1002 KLA group compared with the control group, but showed no change between the Kp1014 no-KLA group and the control group. The level of 18:1/18:2-PC might have been particularly affected by KLA infection caused by K1 serotype K. pneumoniae Kp1002. It may be a potential biomarker for KLA infection.
Collapse
Affiliation(s)
- Nan Chen
- Department of Medical Microbiology, Medicine College, Hebei University, Baoding 071000, China.
| | - Lin-Lin Wang
- Department of Basic Medical Sciences, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Juan Xue
- Basic Medical Sciences, Medicine College, Hebei University, Baoding 071000, China
| | - Xiang-Bo Ma
- Department of Medical Microbiology, Medicine College, Hebei University, Baoding 071000, China
| | - Sheng Zhao
- Department of Medical Microbiology, Medicine College, Hebei University, Baoding 071000, China
| | - Rui-Xue Rong
- Basic Medical Sciences, Medicine College, Hebei University, Baoding 071000, China
| | - Hong-Quan Li
- Department of Medical Microbiology, Medicine College, Hebei University, Baoding 071000, China
| | - Liang Ding
- Basic Medical Sciences, Medicine College, Hebei University, Baoding 071000, China
| | - Ming-Zhi Zheng
- Department of Pharmacology, Zhejiang Medical College, Hangzhou 310053, China
| | - Ying-Ying Chen
- Department of Basic Medical Sciences, Zhejiang University School of Medicine, Hangzhou 310058, China
| | - Fei Duan
- Basic Medical Sciences, Medicine College, Hebei University, Baoding 071000, China.
| | - Yue-Liang Shen
- Department of Basic Medical Sciences, Zhejiang University School of Medicine, Hangzhou 310058, China.
| |
Collapse
|
31
|
Lo TH, Tseng KY, Tsao WS, Yang CY, Hsieh SL, Chiu AWH, Takai T, Mak TW, Tarng DC, Chen NJ. TREM-1 regulates macrophage polarization in ureteral obstruction. Kidney Int 2014; 86:1174-86. [PMID: 24918157 DOI: 10.1038/ki.2014.205] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2013] [Revised: 04/21/2014] [Accepted: 04/24/2014] [Indexed: 12/14/2022]
Abstract
Chronic kidney disease (CKD) is an emerging worldwide public health problem. Inflammatory cell infiltration and activation during the early stages in injured kidneys is a common pathologic feature of CKD. Here, we determined whether an important inflammatory regulator, triggering receptor expressed on myeloid cells (TREM)-1, is upregulated in renal tissues collected from mouse ureteral obstruction-induced nephritis. TREM-1 is crucial for modulating macrophage polarization, and has a pivotal role in mediating tubular injury and interstitial collagen deposition in obstructive nephritis. Lysates from nephritic kidneys triggered a TREM-1-dependent M1 polarization ex vivo, consistent with the observation that granulocyte-macrophage colony-stimulating factor (GM-CSF)-derived M1 macrophages express higher levels of TREM-1 in comparison with M-CSF-derived cells. Moreover, agonistic TREM-1 cross-link significantly strengthens the inductions of iNOS and GM-CSF in M1 cells. These observations are validated by a strong clinical correlation between infiltrating TREM-1-expressing/iNOS-positive macrophages and renal injury in human obstructive nephropathy. Thus, TREM-1 may be a potential diagnostic and therapeutic target in human kidney disease.
Collapse
Affiliation(s)
- Tzu-Han Lo
- Institute of Physiology, School of Medicine, National Yang-Ming University, Taipei, Taiwan (ROC)
| | - Kai-Yu Tseng
- Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, Taipei, Taiwan (ROC)
| | - Wen-Shan Tsao
- Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, Taipei, Taiwan (ROC)
| | - Chih-Ya Yang
- 1] Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, Taipei, Taiwan (ROC) [2] Genomic Research Center, Academia Sinica, Taipei, Taiwan (ROC)
| | - Shie-Liang Hsieh
- 1] Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, Taipei, Taiwan (ROC) [2] Genomic Research Center, Academia Sinica, Taipei, Taiwan (ROC) [3] Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan (ROC) [4] Inflammation and Immunity Research Center, National Yang-Ming University, Taipei, Taiwan (ROC) [5] Immunology Center, Taipei Veterans General Hospital, Taipei, Taiwan (ROC) [6] Institute for Cancer Biology and Drug Discovery, College of Medical Science and Technology, Taipei Medical University, Taipei, Taiwan
| | - Allen Wen-Hsiang Chiu
- Department of Urology, School of Medicine, National Yang-Ming University, Taipei, Taiwan (ROC)
| | - Toshiyuki Takai
- Department of Experimental Immunology, Institute of Development, Aging and Cancer, Tohoku University, Sendai, Japan
| | - Tak W Mak
- The Campbell Family Institute for Breast Cancer Research, Ontario Cancer Institute, University Health Network and Department of Medical Biophysics, University of Toronto, Toronto, Ontario, Canada
| | - Der-Cherng Tarng
- 1] Institute of Physiology, School of Medicine, National Yang-Ming University, Taipei, Taiwan (ROC) [2] Institute of Clinical Medicine, School of Medicine, National Yang-Ming University, Taipei, Taiwan (ROC) [3] Inflammation and Immunity Research Center, National Yang-Ming University, Taipei, Taiwan (ROC) [4] Immunology Center, Taipei Veterans General Hospital, Taipei, Taiwan (ROC) [5] Division of Nephrology, Department of Medicine, Taipei Veterans General Hospital, Taipei, Taiwan (ROC)
| | - Nien-Jung Chen
- 1] Institute of Microbiology and Immunology, School of Life Sciences, National Yang-Ming University, Taipei, Taiwan (ROC) [2] Inflammation and Immunity Research Center, National Yang-Ming University, Taipei, Taiwan (ROC)
| |
Collapse
|