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Wang CY, Liao KM, Wang YH, Chen KH, Chuang S, Liu CJ, Shu CC, Wang HC. Dipeptidyl peptidase IV inhibitors and the risk of mycobacterial pulmonary infections in type 2 diabetes mellitus. J Infect Public Health 2023; 16:1709-1715. [PMID: 37729686 DOI: 10.1016/j.jiph.2023.08.018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2022] [Revised: 07/10/2023] [Accepted: 08/22/2023] [Indexed: 09/22/2023] Open
Abstract
BACKGROUND Type 2 diabetes mellitus (DM) is a risk factor for mycobacterial pulmonary infections (MPI), including tuberculosis (TB) and nontuberculous mycobacterial lung disease (NTM-LD). Dipeptidyl peptidase IV inhibitor (DPP4i), a common DM medication, has an immune-modulation effect that raises concerns about developing MPI. However, there is scarce research on the topic. METHODS This retrospective study was conducted in a tertiary-referral center in Taiwan from 2009 to 2016. Patients with type 2 DM who were receiving any DM medication were enrolled. TB and NTM-LD were defined by microbiological criteria. We analyzed the risk of MPI in DPP4i users using Cox proportional hazard regression with adjusted inverse probability of treatment weighting. RESULTS A total of 9963 patients were included. Among them, 3931 were classified as DPP4i users, and 6032 patients were DPP4i nonusers. DPP4i users had no increase in incidences of MPI (604 vs. 768 per 100,000 person-years, p = 0.776), NTM-LD (174 vs. 255 per 100,000 person-years, p = 0.228), and TB (542 vs. 449 per 100,000 person-years, p = 0.663) relative to those of DPP4i nonusers. After adjustment, the adjusted hazard ratios for MPI (aHR: 1.07, 95% CI: 0.79-1.45), TB (aHR: 1.15, 95% CI: 0.81-1.64) and NTM-LD (aHR: 0.85, 95% CI: 0.49-1.47) were not significantly increased relative to those of nonusers. The subgroup analysis also showed that DPP4i use did not increase the risk of MPI in different DM severities and comorbidities. CONCLUSIONS According to our large cohort study, DPP4i use is safe for patients with type 2 DM and might not increase the risk of MPI.
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Affiliation(s)
- Cheng-Yi Wang
- Department of Internal Medicine, Cardinal Tien Hospital and School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Kuang-Ming Liao
- Department of Internal Medicine, Chi Mei Medical Center, Chiali, Taiwan
| | - Ya-Hui Wang
- Medical Research Center, Cardinal Tien Hospital and School of Medicine, College of Medicine, Fu Jen Catholic University, New Taipei City, Taiwan
| | - Kuang-Hung Chen
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
| | - Shulin Chuang
- Department of Medical Research, National Taiwan University Hospital, Taipei, Taiwan
| | - Chia-Jung Liu
- National Taiwan University College of Medicine, Taipei, Taiwan; Department of Internal Medicine, National Taiwan University Hospital, Hsin-Chu Branch, Hsin-Chu country, Taiwan
| | - Chin-Chung Shu
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; National Taiwan University College of Medicine, Taipei, Taiwan.
| | - Hao-Chien Wang
- Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan; National Taiwan University College of Medicine, Taipei, Taiwan; National Taiwan University Cancer Center, Taipei, Taiwan
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Giacalone VD, Giraldo DM, Silva GL, Hosten J, Peng L, Guglani L, Tirouvanziam R. Pulmonary exacerbations in early cystic fibrosis lung disease are marked by strong modulation of CD3 and PD-1 on luminal T cells. Front Immunol 2023; 14:1194253. [PMID: 37809107 PMCID: PMC10551126 DOI: 10.3389/fimmu.2023.1194253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2023] [Accepted: 09/05/2023] [Indexed: 10/10/2023] Open
Abstract
Background In chronic cystic fibrosis (CF) lung disease, neutrophilic inflammation and T-cell inhibition occur concomitantly, partly due to neutrophil-mediated release of the T-cell inhibitory enzyme Arg1. However, the onset of this tonic inhibition of T cells, and the impact of pulmonary exacerbations (PEs) on this process, remain unknown. Methods Children with CF aged 0-5 years were enrolled in a longitudinal, single-center cohort study. Blood (n = 35) and bronchoalveolar lavage (BAL) fluid (n = 18) were collected at stable outpatient clinic visits or inpatient PE hospitalizations and analyzed by flow cytometry (for immune cell presence and phenotype) and 20-plex chemiluminescence assay (for immune mediators). Patients were categorized by PE history into (i) no prior PE, (ii) past history of PE prior to stable visit, or (iii) current PE. Results PEs were associated with increased concentration of both pro- and anti-inflammatory mediators in BAL, and increased neutrophil frequency and G-CSF in circulation. PE BAL samples showed a trend toward an increased frequency of hyperexocytic "GRIM" neutrophils, which we previously identified in chronic CF. Interestingly, expression levels of the T-cell receptor associated molecule CD3 and of the inhibitory programmed death-1 (PD-1) receptor were respectively decreased and increased on T cells from BAL compared to blood in all patients. When categorized by PE status, CD3 and PD-1 expression on blood T cells did not differ among patients, while CD3 expression was decreased, and PD-1 expression was increased on BAL T cells from patients with current PE. Conclusions Our findings suggest that airway T cells are engaged during early-life PEs, prior to the onset of chronic neutrophilic inflammation in CF. In addition, increased blood neutrophil frequency and a trend toward increased BAL frequency of hyperexocytic neutrophils suggest that childhood PEs may progressively shift the balance of CF airway immunity towards neutrophil dominance.
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Affiliation(s)
- Vincent D. Giacalone
- Department of Pediatrics, Emory University, Atlanta, GA, United States
- Center for CF and Airways Disease Research, Children’s Healthcare of Atlanta, Atlanta, GA, United States
| | - Diego Moncada Giraldo
- Department of Pediatrics, Emory University, Atlanta, GA, United States
- Center for CF and Airways Disease Research, Children’s Healthcare of Atlanta, Atlanta, GA, United States
| | - George L. Silva
- Department of Pediatrics, Emory University, Atlanta, GA, United States
- Center for CF and Airways Disease Research, Children’s Healthcare of Atlanta, Atlanta, GA, United States
| | - Justin Hosten
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, United States
| | - Limin Peng
- Department of Biostatistics and Bioinformatics, Emory University School of Public Health, Atlanta, GA, United States
| | - Lokesh Guglani
- Department of Pediatrics, Emory University, Atlanta, GA, United States
- Center for CF and Airways Disease Research, Children’s Healthcare of Atlanta, Atlanta, GA, United States
| | - Rabindra Tirouvanziam
- Department of Pediatrics, Emory University, Atlanta, GA, United States
- Center for CF and Airways Disease Research, Children’s Healthcare of Atlanta, Atlanta, GA, United States
- Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA, United States
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3
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Stotts C, Corrales-Medina VF, Rayner KJ. Pneumonia-Induced Inflammation, Resolution and Cardiovascular Disease: Causes, Consequences and Clinical Opportunities. Circ Res 2023; 132:751-774. [PMID: 36927184 DOI: 10.1161/circresaha.122.321636] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
Pneumonia is inflammation in the lungs, which is usually caused by an infection. The symptoms of pneumonia can vary from mild to life-threatening, where severe illness is often observed in vulnerable populations like children, older adults, and those with preexisting health conditions. Vaccines have greatly reduced the burden of some of the most common causes of pneumonia, and the use of antimicrobials has greatly improved the survival to this infection. However, pneumonia survivors do not return to their preinfection health trajectories but instead experience an accelerated health decline with an increased risk of cardiovascular disease. The mechanisms of this association are not well understood, but a persistent dysregulated inflammatory response post-pneumonia appears to play a central role. It is proposed that the inflammatory response during pneumonia is left unregulated and exacerbates atherosclerotic vascular disease, which ultimately leads to adverse cardiac events such as myocardial infarction. For this reason, there is a need to better understand the inflammatory cross talk between the lungs and the heart during and after pneumonia to develop therapeutics that focus on preventing pneumonia-associated cardiovascular events. This review will provide an overview of the known mechanisms of inflammation triggered during pneumonia and their relevance to the increased cardiovascular risk that follows this infection. We will also discuss opportunities for new clinical approaches leveraging strategies to promote inflammatory resolution pathways as a novel therapeutic target to reduce the risk of cardiac events post-pneumonia.
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Affiliation(s)
- Cameron Stotts
- Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada (C.S., K.J.R).,Centre for Infection, Immunity, and Inflammation, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada (C.S., V.F.C.-M.).,University of Ottawa Heart Institute, Ottawa, ON, Canada (C.S., K.J.R)
| | - Vicente F Corrales-Medina
- Centre for Infection, Immunity, and Inflammation, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada (C.S., V.F.C.-M.).,Department of Medicine, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada (V.F.C-M).,Ottawa Hospital Research Institute, Ottawa, ON, Canada (V.F.C.-M)
| | - Katey J Rayner
- Department of Biochemistry, Microbiology, and Immunology, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada (C.S., K.J.R).,University of Ottawa Heart Institute, Ottawa, ON, Canada (C.S., K.J.R)
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4
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Wolff CA, Gutierrez-Monreal MA, Meng L, Zhang X, Douma LG, Costello HM, Douglas CM, Ebrahimi E, Pham A, Oliveira AC, Fu C, Nguyen A, Alava BR, Hesketh SJ, Morris AR, Endale MM, Crislip GR, Cheng KY, Schroder EA, Delisle BP, Bryant AJ, Gumz ML, Huo Z, Liu AC, Esser KA. Defining the age-dependent and tissue-specific circadian transcriptome in male mice. Cell Rep 2023; 42:111982. [PMID: 36640301 PMCID: PMC9929559 DOI: 10.1016/j.celrep.2022.111982] [Citation(s) in RCA: 38] [Impact Index Per Article: 38.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 11/01/2022] [Accepted: 12/23/2022] [Indexed: 01/10/2023] Open
Abstract
Cellular circadian clocks direct a daily transcriptional program that supports homeostasis and resilience. Emerging evidence has demonstrated age-associated changes in circadian functions. To define age-dependent changes at the systems level, we profile the circadian transcriptome in the hypothalamus, lung, heart, kidney, skeletal muscle, and adrenal gland in three age groups. We find age-dependent and tissue-specific clock output changes. Aging reduces the number of rhythmically expressed genes (REGs), indicative of weakened circadian control. REGs are enriched for the hallmarks of aging, adding another dimension to our understanding of aging. Analyzing differential gene expression within a tissue at four different times of day identifies distinct clusters of differentially expressed genes (DEGs). Increased variability of gene expression across the day is a common feature of aged tissues. This analysis extends the landscape for understanding aging and highlights the impact of aging on circadian clock function and temporal changes in gene expression.
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Affiliation(s)
- Christopher A Wolff
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA
| | - Miguel A Gutierrez-Monreal
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA; Claude D. Pepper Older Americans Independence Center, University of Florida, Gainesville, FL 32610, USA
| | - Lingsong Meng
- Department of Biostatistics, University of Florida, Gainesville, FL 32610, USA
| | - Xiping Zhang
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA
| | - Lauren G Douma
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Medicine, Division of Nephrology, Hypertension, and Renal Transplantation, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
| | - Hannah M Costello
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Medicine, Division of Nephrology, Hypertension, and Renal Transplantation, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
| | - Collin M Douglas
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA
| | - Elnaz Ebrahimi
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Ann Pham
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Aline C Oliveira
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Chunhua Fu
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Amy Nguyen
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Bryan R Alava
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Stuart J Hesketh
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA
| | - Andrew R Morris
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Mehari M Endale
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - G Ryan Crislip
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Medicine, Division of Nephrology, Hypertension, and Renal Transplantation, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Kit-Yan Cheng
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Medicine, Division of Nephrology, Hypertension, and Renal Transplantation, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Elizabeth A Schroder
- Internal Medicine, Pulmonary, University of Kentucky, Lexington, KY 40506, USA; Department of Physiology, University of Kentucky, Lexington, KY 40506, USA
| | - Brian P Delisle
- Department of Physiology, University of Kentucky, Lexington, KY 40506, USA
| | - Andrew J Bryant
- Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA
| | - Michelle L Gumz
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Medicine, Division of Nephrology, Hypertension, and Renal Transplantation, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Department of Biochemistry and Molecular Biology, University of Florida, Gainesville, FL 32610, USA; Center for Integrative Cardiovascular and Metabolic Disease, College of Medicine, University of Florida, Gainesville, FL 32610, USA
| | - Zhiguang Huo
- Department of Biostatistics, University of Florida, Gainesville, FL 32610, USA.
| | - Andrew C Liu
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA.
| | - Karyn A Esser
- Department of Physiology and Aging, College of Medicine, University of Florida, Gainesville, FL 32610, USA; Myology Institute, University of Florida, Gainesville, FL 32610, USA; Claude D. Pepper Older Americans Independence Center, University of Florida, Gainesville, FL 32610, USA.
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5
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Akt Inhibition Promotes Autophagy and Clearance of Group B Streptococcus from the Alveolar Epithelium. Pathogens 2022; 11:pathogens11101134. [PMID: 36297190 PMCID: PMC9611837 DOI: 10.3390/pathogens11101134] [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: 08/03/2022] [Revised: 09/24/2022] [Accepted: 09/27/2022] [Indexed: 12/04/2022] Open
Abstract
Group B Streptococcus (GBS) is a gram-positive bacterium that is harmless for healthy individuals but may provoke invasive disease in young infants and immunocompromised hosts. GBS invades the epithelial barriers to enter the bloodstream, and thus strategies that enhance epithelial cell responses may hamper GBS invasion. In the present study, we sought to investigate whether the inhibition of Akt, a kinase that regulates host inflammatory responses and autophagy via suppression of mTOR, can enhance the response of non-phagocytic alveolar epithelial cells against GBS. Treatment of the alveolar epithelial cell line A549 with the Akt inhibitor MK-2206 resulted in the enhanced production of reactive oxygen species and inflammatory mediators in response to GBS. Additionally, Akt inhibition via MK-2206 resulted in elevated LC3II/I ratios and increased autophagic flux in alveolar epithelial cells. Importantly, the inhibition of Akt promoted GBS clearance both in alveolar epithelial cells in vitro and in lung tissue in vivo in a murine model of GBS pneumonia. The induction of autophagy was essential for GBS clearance in MK-2206 treated cells, as knockdown of ATG5, a critical component of autophagy, abrogated the effect of Akt inhibition on GBS clearance. Our findings highlight the role of Akt kinase inhibition in promoting autophagy and GBS clearance in the alveolar epithelium. The inhibition of Akt may serve as a promising measure to strengthen epithelial barriers and prevent GBS invasion in susceptible hosts.
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Li Q, Cheng Y, Zhang Z, Bi Z, Ma X, Wei Y, Wei X. Inhibition of ROCK ameliorates pulmonary fibrosis by suppressing M2 macrophage polarisation through phosphorylation of STAT3. Clin Transl Med 2022; 12:e1036. [PMID: 36178087 PMCID: PMC9523675 DOI: 10.1002/ctm2.1036] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 08/09/2022] [Accepted: 08/15/2022] [Indexed: 01/28/2023] Open
Abstract
BACKGROUND Emerging evidence provides mechanistic insights into the pathogenesis of pulmonary fibrosis (PF), and rare anti-PF therapeutic method has promising effect in its treatment. Rho-associated coiled-coil kinases (ROCK) inhibition significantly ameliorates bleomycin-induced PF and decreases macrophage infiltration, but the mechanism remains unclear. We established bleomycin and radiation-induced PF to identify the activity of WXWH0265, a newly designed unselective ROCK inhibitor in regulating macrophages. METHODS Bleomycin-induced PF was induced by intratracheal instillation and radiation-induced PF was induced by bilateral thoracic irradiation. Histopathological techniques (haematoxylin and eosin, Masson's trichrome and immunohistochemistry) and hydroxyproline were used to evaluate PF severity. Western blot, quantitative real-time reverse transcription-polymerase chain reaction and flow cytometry were performed to explore the underlying mechanisms. Bone marrow-derived macrophages (BMDMs) were used to verify their therapeutic effect. Clodronate liposomes were applied to deplete macrophages and to identify the therapeutic effect of WXWH0265. RESULTS Therapeutic administration of ROCK inhibitor ameliorates bleomycin-induced PF by inhibiting M2 macrophages polarisation. ROCK inhibitor showed no significant anti-fibrotic effect in macrophages-depleted mice. Treatment with WXWH0265 demonstrated superior protection effect in bleomycin-induced PF compared with positive drugs. In radiation-induced PF, ROCK inhibitor effectively ameliorated PF. Fibroblasts co-cultured with supernatant from various M2 macrophages phenotypes revealed that M2 macrophages stimulated by interleukin-4 promoted extracellular matrix production. Polarisation of M2 macrophages was inhibited by ROCK inhibitor treatment in vitro. The p-signal transducer and activator of transcription 3 (STAT3) in lung tissue and BMDMs was significantly decreased in PF in vivo and vitro after treated with ROCK inhibitors. CONCLUSION Inhibiting ROCK could significantly attenuate bleomycin- and radiation-induced PF by regulating the macrophages polarisation via phosphorylation of STAT3. WXWH0265 is a kind of efficient unselective ROCK inhibitor in ameliorating PF. Furthermore, the results provide empirical evidence that ROCK inhibitor, WXWH0265 is a potential drug to prevent the development of PF.
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Affiliation(s)
- Qingfang Li
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Yuan Cheng
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Zhe Zhang
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Zhenfei Bi
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Xuelei Ma
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Yuquan Wei
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
| | - Xiawei Wei
- Laboratory of Aging Research and Cancer Drug Target, State Key Laboratory of Biotherapy, National Clinical Research Center for Geriatrics, West China HospitalSichuan UniversityChengduSichuanPR China
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7
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Xu F, Yao W, Xue Y, Sun Q, Cao C. The oncogene ABL1 regulates the inflammatory response of innate immunity via mediating TRAF6 ubiquitination. Immunobiology 2022; 227:152262. [PMID: 36049365 DOI: 10.1016/j.imbio.2022.152262] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2022] [Revised: 05/23/2022] [Accepted: 08/19/2022] [Indexed: 11/25/2022]
Abstract
The oncogene ABL1 plays an important role in various cancers, while its roles remain unclear in pneumonia. This study aims to investigate the roles of ABL1 in pneumonia and the underlying mechanisms. RNA sequencing was used to determine the expressions of multiple kinases in the PBMCs. A series of overexpression and knockout cell lines were constructed. Besides, an intranasal lung infection mouse model was pre-treated with asciminb. ELISAs and qPCR were used to determine the levels of target genes. In addition, STRING Interaction Network and Immunoblotting assays were used to determine the interaction between target proteins. An elevation in ABL1 was observed in the infant with Ecoli pneumonia. ABL1 was positively correlated to the levels of inflammatory cytokines and the activation of the NF-kB pathways. In vivo data demonstrated that the inhibition of ABL1 suppressed the inflammatory cytokines, reduced the lung bacterial burden, and ameliorated the lung injury score. ABL1 inhibited the phosphorylation of IκBα and p38 and regulated the ubiquitination of TRAF6. ABL1 regulates the inflammatory response in pneumonia in part by the regulation of MAPK and NF-κB pathways and TRAF6 ubiquitination.
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Affiliation(s)
- Feng Xu
- Department of Pediatrics, Zibo Central Hospital, No.54 Gongqingtuan West Road, Zhangdian District, Zibo 255036, Shandong, China
| | - Wenjing Yao
- Department of Pediatrics, Zibo Central Hospital, No.54 Gongqingtuan West Road, Zhangdian District, Zibo 255036, Shandong, China
| | - Yuanyuan Xue
- Department of Pediatrics, Zibo Central Hospital, No.54 Gongqingtuan West Road, Zhangdian District, Zibo 255036, Shandong, China
| | - Qi Sun
- Scientific Research and Foreign Cooperation Department, Zibo Central Hospital, No.54 Gongqingtuan West Road, Zhangdian District, Zibo 255036, Shandong, China.
| | - Chunxia Cao
- Department of Pediatrics, Zibo Central Hospital, No.54 Gongqingtuan West Road, Zhangdian District, Zibo 255036, Shandong, China.
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8
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Qin W, Spek CA, Scicluna BP, van der Poll T, Duitman J. Myeloid DNA methyltransferase3b deficiency aggravates pulmonary fibrosis by enhancing profibrotic macrophage activation. Respir Res 2022; 23:162. [PMID: 35725453 PMCID: PMC9210707 DOI: 10.1186/s12931-022-02088-5] [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: 12/10/2021] [Accepted: 06/09/2022] [Indexed: 11/10/2022] Open
Abstract
Background Idiopathic pulmonary fibrosis (IPF) is a chronic, progressive and severe disease characterized by excessive matrix deposition in the lungs. Macrophages play crucial roles in maintaining lung homeostasis but are also central in the pathogenesis of lung diseases like pulmonary fibrosis. Especially, macrophage polarization/activation seems to play a crucial role in pathology and epigenetic reprograming is well-known to regulate macrophage polarization. DNA methylation alterations in IPF lungs have been well documented, but the role of DNA methylation in specific cell types, especially macrophages, is poorly defined. Methods In order to determine the role of DNA methylation in macrophages during pulmonary fibrosis, we subjected macrophage specific DNA methyltransferase (DNMT)3B, which mediates the de novo DNA methylation, deficient mice to the bleomycin-induced pulmonary fibrosis model. Macrophage polarization and fibrotic parameters were evaluated at 21 days after bleomycin administration. Dnmt3b knockout and wild type bone marrow-derived macrophages were stimulated with either interleukin (IL)4 or transforming growth factor beta 1 (TGFB1) in vitro, after which profibrotic gene expression and DNA methylation at the Arg1 promotor were determined. Results We show that DNMT3B deficiency promotes alternative macrophage polarization induced by IL4 and TGFB1 in vitro and also enhances profibrotic macrophage polarization in the alveolar space during pulmonary fibrosis in vivo. Moreover, myeloid specific deletion of DNMT3B promoted the development of experimental pulmonary fibrosis. Conclusions In summary, these data suggest that myeloid DNMT3B represses fibrotic macrophage polarization and protects against bleomycin induced pulmonary fibrosis.
Supplementary Information The online version contains supplementary material available at 10.1186/s12931-022-02088-5.
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Affiliation(s)
- Wanhai Qin
- Center of Experimental and Molecular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Meibergdreef 9, Room G2-130, 1105AZ, Amsterdam, The Netherlands.
| | - C Arnold Spek
- Center of Experimental and Molecular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Meibergdreef 9, Room G2-130, 1105AZ, Amsterdam, The Netherlands
| | - Brendon P Scicluna
- Center of Experimental and Molecular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Meibergdreef 9, Room G2-130, 1105AZ, Amsterdam, The Netherlands.,Department of Clinical Epidemiology, Biostatistics, and Bioinformatics, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Department of Applied Biomedical Science, Faculty of Health Sciences, Mater Dei Hospital, Centre for Molecular Medicine and Biobanking, University of Malta, Msida, Malta
| | - Tom van der Poll
- Center of Experimental and Molecular Medicine, Amsterdam University Medical Centers, University of Amsterdam, Meibergdreef 9, Room G2-130, 1105AZ, Amsterdam, The Netherlands.,Division of Infectious Diseases, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands
| | - JanWillem Duitman
- Department of Pulmonary Medicine, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Department of Experimental Immunology, Amsterdam University Medical Centers, University of Amsterdam, Amsterdam, The Netherlands.,Amsterdam Infection & Immunity, Inflammatory Diseases, Amsterdam, The Netherlands
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9
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Title-Inflammatory Signaling Pathways in Allergic and Infection-Associated Lung Diseases. ALLERGIES 2022. [DOI: 10.3390/allergies2020006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Lung inflammation can be caused by pathogen infection alone or by allergic disease, leading to pneumonitis. Most of the allergens (antigens) that cause allergic lung diseases, including asthma and hypersensitivity pneumonitis (HP), are derived from microorganisms, such as bacteria, viruses, and fungi, but some inorganic materials, such as mercury, can also cause pneumonitis. Certain allergens, including food and pollen, can also cause acute allergic reactions and lead to lung inflammation in individuals predisposed to such reactions. Pattern recognition-associated and damage-associated signaling by these allergens can be critical in determining the type of hypersensitization and allergic disease, as well as the potential for fibrosis and irreversible lung damage. This review discusses the signs, symptoms, and etiology of allergic asthma, and HP. Furthermore, we review the immune response and signaling pathways involved in pneumonitis due to both microbial infection and allergic processes. We also discuss current and potential therapeutic interventions for infection-associated and allergic lung inflammation.
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10
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Abstract
OBJECTIVE Interleukin-38 (IL-38), a new type of cytokine, is involved in processes such as tissue repair, inflammatory response, and immune response. However, its function in pneumonia caused by Pseudomonas aeruginosa (P. aeruginosa) is still unclear. METHODS In this study, we detected circulating IL-38 and cytokines such as IL-1β, IL-6, IL-17A, TNF-α, IL-8, and IL-10 in adults affected by early stage pneumonia caused by P. aeruginosa. Collected clinical data of these patients, such as the APACHE II score, levels of PCT, and oxygenation index when they entering the ICU. Using P. aeruginosa-induced pneumonia WT murine model to evaluate the effect of IL-38 on Treg differentiation, cell apoptosis, survival, tissue damage, inflammation, and bacterial removal. RESULTS In clinical research, although IL-38 is significantly increased during the early stages of clinical P. aeruginosa pneumonia, the concentration of IL-38 in the serum of patients who died with P. aeruginosa pneumonia was relatively lower than that of surviving patients. It reveals IL-38 may insufficiently secreted in patients who died with P. aeruginosa pneumonia. Besides, the serum IL-38 level of patients with P. aeruginosa pneumonia on the day of admission to the ICU showed significantly positive correlations with IL-10 and the PaO2/FiO2 ratio but negative correlations with IL-1β, IL-6, IL-8, IL-17, TNF-α, APACHE II score, and PCT In summary, IL-38 might be a molecule for adjuvant therapy in P. aeruginosa pneumonia. In experimental animal models, first recombinant IL-38 improved survival, whereas anti-IL-38 antibody reduced survival in the experimental pneumonia murine model. Secondly, IL-38 exposure reduced the inflammatory response, as suggested by the lung injury, and reduced cytokine levels (IL-1β, IL-6, IL- 17A, TNF-α, and IL-8, but not IL-10). It also increased bacterial clearance and reduced cell apoptosis in the lungs. Furthermore, IL-38 was shown to reduce TBK1 expression in vitro when naive CD4+ T lymphocytes were differentiated to Tregs and played a protective role in P. aeruginosa pneumonia. CONCLUSIONS To summarize, the above findings provide additional insights into the mechanism of IL-38 in the treatment of P. aeruginosa pneumonia.
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11
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Gilliaux G, Desmecht D. Gammaherpesvirus Alters Alveolar Macrophages According to the Host Genetic Background and Promotes Beneficial Inflammatory Control over Pneumovirus Infection. Viruses 2022; 14:v14010098. [PMID: 35062301 PMCID: PMC8777918 DOI: 10.3390/v14010098] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 01/25/2023] Open
Abstract
Human respiratory syncytial virus (hRSV) infection brings a wide spectrum of clinical outcomes, from a mild cold to severe bronchiolitis or even acute interstitial pneumonia. Among the known factors influencing this clinical diversity, genetic background has often been mentioned. In parallel, recent evidence has also pointed out that an early infectious experience affects heterologous infections severity. Here, we analyzed the importance of these two host-related factors in shaping the immune response in pneumoviral disease. We show that a prior gammaherpesvirus infection improves, in a genetic background-dependent manner, the immune system response against a subsequent lethal dose of pneumovirus primary infection notably by inducing a systematic expansion of the CD8+ bystander cell pool and by modifying the resident alveolar macrophages (AMs) phenotype to induce immediate cyto/chemokinic responses upon pneumovirus exposure, thereby drastically attenuating the host inflammatory response without affecting viral replication. Moreover, we show that these AMs present similar rapid and increased production of neutrophil chemokines both in front of pneumoviral or bacterial challenge, confirming recent studies attributing a critical antibacterial role of primed AMs. These results corroborate other recent studies suggesting that the innate immunity cells are themselves capable of memory, a capacity hitherto reserved for acquired immunity.
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12
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Wang Q, Wang Q, Zhao Z, Fan J, Qin L, Alexander DB, Tsuda H, Zhao D, Xu J. Surfactant Proteins A/D-CD14 on Alveolar Macrophages Is a Common Pathway Associated With Phagocytosis of Nanomaterials and Cytokine Production. Front Immunol 2021; 12:758941. [PMID: 34777371 PMCID: PMC8578846 DOI: 10.3389/fimmu.2021.758941] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 10/07/2021] [Indexed: 12/12/2022] Open
Abstract
Alveolar macrophages are responsible for clearance of airborne dust and pathogens. How they recognize and phagocytose a variety of engineered nanomaterials (ENMs) with different properties is an important issue for safety assessment of ENMs. Surfactant-associated proteins, specifically existing in the pulmonary surfactant, are important opsonins for phagocytosis of airborne microorganisms. The purposes of the current study are to understand whether opsonization of ENMs by surfactant-associated proteins promotes phagocytosis of ENMs and cytokine production, and to determine whether a common pathway for phagocytosis of ENMs with different properties exists. For these purposes, four ENMs, MWCNT-7, TiO2, SiO2, and fullerene C60, with different shapes, sizes, chemical compositions, and surface reactivities, were chosen for this study. Short-term pulmonary exposure to MWCNT-7, TiO2, SiO2, and C60 induced inflammation in the rat lung, and most of the administered ENMs were phagocytosed by alveolar macrophages. The ENMs were phagocytosed by isolated primary alveolar macrophages (PAMs) in vitro, and phagocytosis was enhanced by rat bronchioalveolar lavage fluid (BALF), suggesting that proteins in the BALF were associated with phagocytosis. Analysis of proteins bound to the 4 ENMs by LC/MS indicated that surfactant-associated proteins A and D (SP-A, SP-D) were common binding proteins for all the 4 ENMs. Both BALF and SP-A, but not SP-D, enhanced TNF-α production by MWCNT-7 treated PAMs; BALF, SP-A, and SP-D increased IL-1β production in TiO2 and SiO2 treated PAMs; and BALF, SP-A, and SP-D enhanced IL-6 production in C60 treated PAMs. Knockdown of CD14, a receptor for SP-A/D, significantly reduced phagocytosis of ENMs and SP-A-enhanced cytokine production by PAMs. These results indicate that SP-A/D can opsonize all the test ENMs and enhance phagocytosis of the ENMs by alveolar macrophages through CD14, suggesting that SP-A/D-CD14 is a common pathway mediating phagocytosis of ENMs. Cytokine production induced by ENMs, however, is dependent on the type of ENM that is phagocytosed. Our results demonstrate a dual role for surfactant proteins as opsonins for both microbes and for inhaled dusts and fibers, including ENMs, allowing macrophages to recognize and remove the vast majority of these particles, thereby, greatly lessening their toxicity in the lung.
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Affiliation(s)
- Qiqi Wang
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China.,Department of Clinical Laboratory, Anhui General Hospital of Chinese People's Armed Police Forces, Hefei, China
| | - Qiong Wang
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Ziyue Zhao
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - Jingbo Fan
- Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital, Anhui Medical University, Hefei, China
| | - Linghan Qin
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China
| | - David B Alexander
- Laboratory of Nanotoxicology Project, Nagoya City University, Nagoya, Japan
| | - Hiroyuki Tsuda
- Laboratory of Nanotoxicology Project, Nagoya City University, Nagoya, Japan
| | - Dahai Zhao
- Department of Respiratory and Critical Care Medicine, The Second Affiliated Hospital, Anhui Medical University, Hefei, China
| | - Jiegou Xu
- Department of Immunology, School of Basic Medical Sciences, Anhui Medical University, Hefei, China.,Laboratory of Nanotoxicology Project, Nagoya City University, Nagoya, Japan
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13
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Che KF, Paulsson M, Piersiala K, Sax J, Mboob I, Rahman M, Rekha RS, Säfholm J, Adner M, Bergman P, Cardell LO, Riesbeck K, Lindén A. Complex Involvement of Interleukin-26 in Bacterial Lung Infection. Front Immunol 2021; 12:761317. [PMID: 34777376 PMCID: PMC8581676 DOI: 10.3389/fimmu.2021.761317] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2021] [Accepted: 10/12/2021] [Indexed: 01/16/2023] Open
Abstract
Pneumonia is a global cause of mortality, and this provides a strong incentive to improve the mechanistic understanding of innate immune responses in the lungs. Here, we characterized the involvement of the cytokine interleukin (IL)-26 in bacterial lung infection. We observed markedly increased concentrations of IL-26 in lower airway samples from patients with bacterial pneumonia and these correlated with blood neutrophil concentrations. Moreover, pathogen-associated molecular patterns (PAMPs) from both Gram-negative and -positive bacteria increased extracellular IL-26 concentrations in conditioned media from human models of alveolar epithelial cells, macrophages, and neutrophils in vitro. Stimulation with IL-26 inhibited the inherent release of neutrophil elastase and myeloperoxidase in unexposed neutrophils. This stimulation also inhibited the expression of activity makers in neutrophils exposed to Klebsiella pneumoniae. In addition, priming of human lung tissue ex vivo with exogenous IL-26 potentiated the endotoxin-induced increase in mRNA for other cytokines involved in the innate immune response, including the master Th17-regulator IL-23 and the archetype inhibitory cytokine IL-10. Finally, neutralization of endogenous IL-26 clearly increased the growth of Klebsiella pneumoniae in the macrophage culture. These findings suggest that IL-26 is involved in bacterial lung infection in a complex manner, by modulating critical aspects of innate immune responses locally and systemically in a seemingly purposeful manner and by contributing to the killing of bacteria in a way that resembles an antimicrobial peptide. Thus, IL-26 displays both diagnostic and therapeutic potential in pneumonia and deserves to be further evaluated in these respects.
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Affiliation(s)
- Karlhans F Che
- Unit for Lung and Airway Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.,Karolinska Severe Chronic Obstructive Pulmonary Disease (COPD) Center, Department of Respiratory Medicine and Allergy, Karolinska University Hospital Solna, Stockholm, Sweden
| | - Magnus Paulsson
- Clinical Microbiology, Department of Translational Medicine, Faculty of Medicine, Lund University, Malmö, Sweden.,Division of Infection Medicine, Department of Clinical Sciences, Faculty of Medicine, Lund University, Lund, Sweden.,Department of Infectious Diseases, Skåne University Hospital, Lund, Sweden
| | - Krzysztof Piersiala
- Division of Ear Nose and Throat (ENT) Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.,Department of Ear Nose and Throat (ENT) Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - Jakob Sax
- Unit for Lung and Airway Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Ibrahim Mboob
- Unit for Lung and Airway Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Mizanur Rahman
- Unit of Integrative Toxicology, Institute of Environmental Medicine (IMM), Karolinska Institutet, Stockholm, Sweden
| | - Rokeya S Rekha
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden
| | - Jesper Säfholm
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.,Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Mikael Adner
- Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.,Centre for Allergy Research, Karolinska Institutet, Stockholm, Sweden
| | - Peter Bergman
- Division of Clinical Microbiology, Department of Laboratory Medicine, Karolinska Institutet, Stockholm, Sweden.,Immunodeficiency Unit, Department of Infectious Disease, Karolinska University Hospital, Stockholm, Sweden
| | - Lars-Olaf Cardell
- Division of Ear Nose and Throat (ENT) Diseases, Department of Clinical Sciences, Intervention and Technology, Karolinska Institutet, Stockholm, Sweden.,Department of Ear Nose and Throat (ENT) Diseases, Karolinska University Hospital, Stockholm, Sweden
| | - Kristian Riesbeck
- Clinical Microbiology, Department of Translational Medicine, Faculty of Medicine, Lund University, Malmö, Sweden
| | - Anders Lindén
- Unit for Lung and Airway Research, Institute of Environmental Medicine, Karolinska Institutet, Stockholm, Sweden.,Karolinska Severe Chronic Obstructive Pulmonary Disease (COPD) Center, Department of Respiratory Medicine and Allergy, Karolinska University Hospital Solna, Stockholm, Sweden
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14
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Viral and Bacterial Co-Infections in the Lungs: Dangerous Liaisons. Viruses 2021; 13:v13091725. [PMID: 34578306 PMCID: PMC8472850 DOI: 10.3390/v13091725] [Citation(s) in RCA: 28] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2021] [Revised: 08/26/2021] [Accepted: 08/27/2021] [Indexed: 12/23/2022] Open
Abstract
Respiratory tract infections constitute a significant public health problem, with a therapeutic arsenal that remains relatively limited and that is threatened by the emergence of antiviral and/or antibiotic resistance. Viral–bacterial co-infections are very often associated with the severity of these respiratory infections and have been explored mainly in the context of bacterial superinfections following primary influenza infection. This review summarizes our current knowledge of the mechanisms underlying these co-infections between respiratory viruses (influenza viruses, RSV, and SARS-CoV-2) and bacteria, at both the physiological and immunological levels. This review also explores the importance of the microbiome and the pathological context in the evolution of these respiratory tract co-infections and presents the different in vitro and in vivo experimental models available. A better understanding of the complex functional interactions between viruses/bacteria and host cells will allow the development of new, specific, and more effective diagnostic and therapeutic approaches.
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15
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Effects of CNS Injury-Induced Immunosuppression on Pulmonary Immunity. Life (Basel) 2021; 11:life11060576. [PMID: 34207063 PMCID: PMC8235795 DOI: 10.3390/life11060576] [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: 05/12/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/17/2022] Open
Abstract
Patients suffering from stroke, traumatic brain injury, or other forms of central nervous system (CNS) injury have an increased risk of nosocomial infections due to CNS injury-induced immunosuppression (CIDS). Immediately after CNS-injury, the response in the brain is pro-inflammatory; however, subsequently, local and systemic immunity is suppressed due to the compensatory release of immunomodulatory neurotransmitters. CIDS makes patients susceptible to contracting infections, among which pneumonia is very common and often lethal. Ventilator-acquired pneumonia has a mortality of 20–50% and poses a significant risk to vulnerable patients such as stroke survivors. The mechanisms involved in CIDS are not well understood. In this review, we consolidate the evidence for cellular processes underlying the pathogenesis of CIDS, the emerging treatments, and speculate further on the immune elements at play.
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16
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Crawford MS, Nordgren TM, McCole DF. Every breath you take: Impacts of environmental dust exposure on intestinal barrier function-from the gut-lung axis to COVID-19. Am J Physiol Gastrointest Liver Physiol 2021; 320:G586-G600. [PMID: 33501887 PMCID: PMC8054554 DOI: 10.1152/ajpgi.00423.2020] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 01/19/2021] [Accepted: 01/20/2021] [Indexed: 01/31/2023]
Abstract
As countries continue to industrialize, major cities experience diminished air quality, whereas rural populations also experience poor air quality from sources such as agricultural operations. These exposures to environmental pollution from both rural and populated/industrialized sources have adverse effects on human health. Although respiratory diseases (e.g., asthma and chronic obstructive pulmonary disease) are the most commonly reported following long-term exposure to particulate matter and hazardous chemicals, gastrointestinal complications have also been associated with the increased risk of lung disease from inhalation of polluted air. The interconnectedness of these organ systems has offered valuable insights into the roles of the immune system and the micro/mycobiota as mediators of communication between the lung and the gut during disease states. A topical example of this relationship is provided by reports of multiple gastrointestinal symptoms in patients with coronavirus disease 2019 (COVID-19), whereas the rapid transmission and increased risk of COVID-19 has been linked to poor air quality and high levels of particulate matter. In this review, we focus on the mechanistic effects of environmental pollution on disease progression with special emphasis on the gut-lung axis.
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Affiliation(s)
- Meli'sa S Crawford
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, California
| | - Tara M Nordgren
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, California
| | - Declan F McCole
- Division of Biomedical Sciences, School of Medicine, University of California, Riverside, California
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17
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Saha D, Kundu S. A Molecular Interaction Map of Klebsiella pneumoniae and Its Human Host Reveals Potential Mechanisms of Host Cell Subversion. Front Microbiol 2021; 12:613067. [PMID: 33679637 PMCID: PMC7930833 DOI: 10.3389/fmicb.2021.613067] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Accepted: 01/11/2021] [Indexed: 12/13/2022] Open
Abstract
Klebsiella pneumoniae is a leading cause of pneumonia and septicemia across the world. The rapid emergence of multidrug-resistant K. pneumoniae strains necessitates the discovery of effective drugs against this notorious pathogen. However, there is a dearth of knowledge on the mechanisms by which this deadly pathogen subverts host cellular machinery. To fill this knowledge gap, our study attempts to identify the potential mechanisms of host cell subversion by building a K. pneumoniae-human interactome based on rigorous computational methodology. The putative host targets inferred from the predicted interactome were found to be functionally enriched in the host's immune surveillance system and allied functions like apoptosis, hypoxia, etc. A multifunctionality-based scoring system revealed P53 as the most multifunctional protein among host targets accompanied by HIF1A and STAT1. Moreover, mining of host protein-protein interaction (PPI) network revealed that host targets interact among themselves to form a network (TTPPI), where P53 and CDC5L occupy a central position. The TTPPI is composed of several inter complex interactions which indicate that K. pneumoniae might disrupt functional coordination between these protein complexes through targeting of P53 and CDC5L. Furthermore, we identified four pivotal K. pneumoniae-targeted transcription factors (TTFs) that are part of TTPPI and are involved in generating host's transcriptional response to K. pneumoniae-mediated sepsis. In a nutshell, our study identifies some of the pivotal molecular targets of K. pneumoniae which primarily correlate to the physiological response of host during K. pneumoniae-mediated sepsis.
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Affiliation(s)
- Deeya Saha
- Department of Biophysics, Molecular Biology and Bioinformatics, Faculty of Science, University of Calcutta, Kolkata, India
| | - Sudip Kundu
- Department of Biophysics, Molecular Biology and Bioinformatics, Faculty of Science, University of Calcutta, Kolkata, India
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18
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Lin WC, Fessler MB. Regulatory mechanisms of neutrophil migration from the circulation to the airspace. Cell Mol Life Sci 2021; 78:4095-4124. [PMID: 33544156 PMCID: PMC7863617 DOI: 10.1007/s00018-021-03768-z] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 12/22/2020] [Accepted: 01/16/2021] [Indexed: 02/07/2023]
Abstract
The neutrophil, a short-lived effector leukocyte of the innate immune system best known for its proteases and other degradative cargo, has unique, reciprocal physiological interactions with the lung. During health, large numbers of ‘marginated’ neutrophils reside within the pulmonary vasculature, where they patrol the endothelial surface for pathogens and complete their life cycle. Upon respiratory infection, rapid and sustained recruitment of neutrophils through the endothelial barrier, across the extravascular pulmonary interstitium, and again through the respiratory epithelium into the airspace lumen, is required for pathogen killing. Overexuberant neutrophil trafficking to the lung, however, causes bystander tissue injury and underlies several acute and chronic lung diseases. Due in part to the unique architecture of the lung’s capillary network, the neutrophil follows a microanatomic passage into the distal airspace unlike that observed in other end-organs that it infiltrates. Several of the regulatory mechanisms underlying the stepwise recruitment of circulating neutrophils to the infected lung have been defined over the past few decades; however, fundamental questions remain. In this article, we provide an updated review and perspective on emerging roles for the neutrophil in lung biology, on the molecular mechanisms that control the trafficking of neutrophils to the lung, and on past and ongoing efforts to design therapeutics to intervene upon pulmonary neutrophilia in lung disease.
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Affiliation(s)
- Wan-Chi Lin
- Immunity, Inflammation and Disease Laboratory, National Institute of Environmental Health Sciences, NIH, 111 T.W. Alexander Drive, P.O. Box 12233, MD D2-01, Research Triangle Park, NC, 27709, USA
| | - Michael B Fessler
- Immunity, Inflammation and Disease Laboratory, National Institute of Environmental Health Sciences, NIH, 111 T.W. Alexander Drive, P.O. Box 12233, MD D2-01, Research Triangle Park, NC, 27709, USA.
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19
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Sharma J, Parsai K, Raghuwanshi P, Ali SA, Tiwari V, Bhargava A, Mishra PK. Emerging role of mitochondria in airborne particulate matter-induced immunotoxicity. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116242. [PMID: 33321436 DOI: 10.1016/j.envpol.2020.116242] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/23/2020] [Accepted: 12/06/2020] [Indexed: 05/05/2023]
Abstract
The immune system is one of the primary targets of airborne particulate matter. Recent evidence suggests that mitochondria lie at the center of particulate matter-induced immunotoxicity. Particulate matter can directly interact with mitochondrial components (proteins, lipids, and nucleic acids) and impairs the vital mitochondrial processes including redox mechanisms, fusion-fission, autophagy, and metabolic pathways. These disturbances impede different mitochondrial functions including ATP production, which acts as an important platform to regulate immunity and inflammatory responses. Moreover, the mitochondrial DNA released into the cytosol or in the extracellular milieu acts as a danger-associated molecular pattern and triggers the signaling pathways, involving cGAS-STING, TLR9, and NLRP3. In the present review, we discuss the emerging role of mitochondria in airborne particulate matter-induced immunotoxicity and its myriad biological consequences in health and disease.
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Affiliation(s)
- Jahnavi Sharma
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Kamakshi Parsai
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Pragati Raghuwanshi
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Sophiya Anjum Ali
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Vineeta Tiwari
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Arpit Bhargava
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India
| | - Pradyumna Kumar Mishra
- Department of Molecular Biology, ICMR-National Institute for Research in Environmental Health, Bhopal, India.
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20
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Zhang H, He F, Li P, Hardwidge PR, Li N, Peng Y. The Role of Innate Immunity in Pulmonary Infections. BIOMED RESEARCH INTERNATIONAL 2021; 2021:6646071. [PMID: 33553427 PMCID: PMC7847335 DOI: 10.1155/2021/6646071] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 12/26/2020] [Accepted: 01/08/2021] [Indexed: 02/07/2023]
Abstract
Innate immunity forms a protective line of defense in the early stages of pulmonary infection. The primary cellular players of the innate immunity against respiratory infections are alveolar macrophages (AMs), dendritic cells (DCs), neutrophils, natural killer (NK) cells, and innate lymphoid cells (ILCs). They recognize conserved structures of microorganisms through membrane-bound and intracellular receptors to initiate appropriate responses. In this review, we focus on the prominent roles of innate immune cells and summarize transmembrane and cytosolic pattern recognition receptor (PRR) signaling recognition mechanisms during pulmonary microbial infections. Understanding the mechanisms of PRR signal recognition during pulmonary pathogen infections will help us to understand pulmonary immunopathology and lay a foundation for the development of effective therapies to treat and/or prevent pulmonary infections.
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Affiliation(s)
- Huihui Zhang
- College of Animal Medicine, Southwest University, Chongqing, China
| | - Fang He
- College of Animal Medicine, Southwest University, Chongqing, China
| | - Pan Li
- College of Animal Medicine, Southwest University, Chongqing, China
| | | | - Nengzhang Li
- College of Animal Medicine, Southwest University, Chongqing, China
| | - Yuanyi Peng
- College of Animal Medicine, Southwest University, Chongqing, China
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21
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Silva PUJ, Paranhos LR, Meneses-Santos D, Blumenberg C, Macedo DR, Cardoso SV. Combination of toothbrushing and chlorhexidine compared with exclusive use of chlorhexidine to reduce the risk of ventilator-associated pneumonia: A systematic review with meta-analysis. Clinics (Sao Paulo) 2021; 76:e2659. [PMID: 34133659 PMCID: PMC8158674 DOI: 10.6061/clinics/2021/e2659] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2020] [Accepted: 04/15/2021] [Indexed: 01/08/2023] Open
Abstract
This study aimed to compare the effectiveness of 0.12% chlorhexidine alone and 0.12% chlorhexidine in combination with toothbrushing to prevent ventilator-associated pneumonia (VAP) in mechanically ventilated patients. The Embase, Latin American and Caribbean Health Science Literature, PubMed, Scientific Electronic Library Online, Scopus, LIVIVO, Web of Science, Cochrane Library, OpenThesis, and Open Access Thesis and Dissertations databases were used. Only randomized controlled trials without restrictions on the year or language of publication were included. Two reviewers assessed the risk of bias using the Joanna Briggs Institute Critical Appraisal Tool. A meta-analysis using a random-effects model estimated the combined relative risk (RR). The Grading of Recommendations, Assessment, Development and Evaluations approach was used to assess the certainty of the evidence. Initially, 2,337 studies were identified, of which 4 were considered in the systematic review and 3 in the meta-analysis (total sample: 796 patients). The studies were published between 2009 and 2017. All eligible studies had a low risk of bias. The meta-analysis revealed that the risk of VAP was 24% lower in patients receiving chlorhexidine combined with toothbrushing than in those receiving chlorhexidine alone (RR: 0.76; 95% confidence interval: 0.55-1.06), with moderate certainty of evidence and without statistical significance. In conclusion, considering the limitations of this study, a standard protocol for the prevention of VAP is not yet recommended. More studies with larger sample sizes are needed to draw strong conclusions. However, considering that toothbrushing is a simple intervention, it should be a common practice in mechanically ventilated patients, especially among patients with coronavirus disease.
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Affiliation(s)
- Pedro Urquiza Jayme Silva
- Programa de Pos-Graduacao em Odontologia, Faculdade de Odontologia, Universidade Federal de Uberlandia, Uberlandia, MG, BR
| | - Luiz Renato Paranhos
- Area de Odontologia Preventiva e Social, Faculdade de Odontologia, Universidade Federal de Uberlandia, Uberlandia, MG, BR
- Corresponding author. E-mail:
| | - Daniela Meneses-Santos
- Programa de Residencia em Cirurgia e Traumatologia Buco-Maxilo-Facial, Faculdade de Medicina, Universidade Federal de Uberlandia, Uberlandia, MG, BR
| | - Cauane Blumenberg
- Programa de Pos-Graduacao em Epidemiologia, Faculdade de Medicina, Universidade Federal de Pelotas, Pelotas, RS, BR
| | | | - Sérgio Vitorino Cardoso
- Area de Patologia, Faculdade de Odontologia, Universidade Federal de Uberlandia, Uberlandia, MG, BR
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22
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Ahmad S, Arora S, Khan S, Mohsin M, Mohan A, Manda K, Syed MA. Vitamin D and its therapeutic relevance in pulmonary diseases. J Nutr Biochem 2020; 90:108571. [PMID: 33388351 DOI: 10.1016/j.jnutbio.2020.108571] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2020] [Revised: 09/20/2020] [Accepted: 12/24/2020] [Indexed: 01/15/2023]
Abstract
Vitamin D is customarily involved in maintaining bone and calcium homeostasis. However, contemporary studies have identified the implication of vitamin D in several cellular processes including cellular proliferation, differentiation, wound healing, repair and regulatory systems inclusive of host defence, immunity, and inflammation. Multiple studies have indicated corelations between low serum levels of vitamin D, perturbed pulmonary functions and enhanced incidences of inflammatory diseases. Almost all of the pulmonary diseases including acute lung injury, cystic fibrosis, asthma, COPD, Pneumonia and Tuberculosis, all are inflammatory in nature. Studies have displayed strong inter-relations with vitamin D deficiency and progression of lung disorders; however, the underlying mechanism is still unknown. Vitamin D has emerged to possess inhibiting effects on pulmonary inflammation while exaggerating innate immune defenses by strongly influencing functions of inflammatory cells including dendritic cells, monocyte/macrophages, T cells, and B cells along with structural epithelial cells. This review dissects the effects of vitamin D on the inflammatory cells and their therapeutic relevance in pulmonary diseases. Although, the data obtained is very limited and needs further corroboration but presents an exciting area of further research. This is because of its ease of supplementation and development of personalized medicine which could lead us to an effective adjunct and cost-effective method of therapeutic modality for highly fatal pulmonary diseases.
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Affiliation(s)
- Shaniya Ahmad
- Translational Research Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India; Institute of Nuclear Medicine and Allied Science, Defence Research and Development Organisation, New Delhi, India
| | - Shweta Arora
- Translational Research Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India
| | - Salman Khan
- Translational Research Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India
| | - Mohd Mohsin
- Translational Research Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India
| | - Anant Mohan
- Department of Pulmonary Medicine, AIIMS, New Delhi, India
| | - Kailash Manda
- Institute of Nuclear Medicine and Allied Science, Defence Research and Development Organisation, New Delhi, India
| | - Mansoor Ali Syed
- Translational Research Lab, Department of Biotechnology, Jamia Millia Islamia, New Delhi, India.
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23
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Bronchial Epithelial Tet2 Maintains Epithelial Integrity during Acute Pseudomonas aeruginosa Pneumonia. Infect Immun 2020; 89:IAI.00603-20. [PMID: 33046509 DOI: 10.1128/iai.00603-20] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2020] [Accepted: 10/05/2020] [Indexed: 12/23/2022] Open
Abstract
Respiratory epithelial cells are important for pulmonary innate immune responses during Pseudomonas aeruginosa infection. Tet methylcytosine dioxygenase 2 (Tet2) has been implicated in the regulation of host defense by myeloid and lymphoid cells, but whether Tet2 also contributes to epithelial responses during pneumonia is unknown. The aim of this study was to investigate the role of bronchial epithelial Tet2 in acute pneumonia caused by P. aeruginosa To this end, we crossed mice with Tet2 flanked by two Lox-P sites (Tet2fl/fl mice) with mice expressing Cre recombinase under the bronchial epithelial cell-specific Cc10 promoter (Cc10Cre mice) to generate bronchial epithelial cell-specific Tet2-deficient (Tet2fl/fl Cc10Cre ) mice. Six hours after infection with P. aeruginosa, Tet2fl/fl Cc10Cre and wild-type mice had similar bacterial loads in bronchoalveolar lavage fluid (BALF). At this time point, Tet2fl/fl Cc10Cre mice displayed reduced mRNA levels of the chemokines Cxcl1, Cxcl2, and Ccl20 in bronchial brushes. However, Cxcl1, Cxcl2, and Ccl20 protein levels and leukocyte recruitment in BALF were not different between groups. Tet2fl/fl Cc10Cre mice had increased protein levels in BALF after infection, indicating a disturbed epithelial barrier function, which was corroborated by reduced mRNA expression of tight junction protein 1 and occludin in bronchial brushes. Differences detected between Tet2fl/fl Cc10Cre and wild-type mice were no longer present at 24 h after infection. These results suggest that bronchial epithelial Tet2 contributes to maintaining epithelial integrity by enhancing intracellular connections between epithelial cells during the early phase of P. aeruginosa pneumonia.
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24
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Regulation of Pulmonary Bacterial Immunity by Follistatin-Like Protein 1. Infect Immun 2020; 89:IAI.00298-20. [PMID: 33077624 DOI: 10.1128/iai.00298-20] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2020] [Accepted: 10/05/2020] [Indexed: 11/20/2022] Open
Abstract
Klebsiella pneumoniae is a common cause of antibiotic-resistant pneumonia. Follistatin-like protein 1 (FSTL-1) is highly expressed in the lung and is critical for lung homeostasis. The role of FSTL-1 in immunity to bacterial pneumonia is unknown. Wild-type (WT) and FSTL-1 hypomorphic (Hypo) mice were infected with Klebsiella pneumoniae to determine infectious burden, immune cell abundance, and cytokine production. FSTL-1 Hypo/TCRδ-/- and FSTL-1 Hypo/IL17ra-/- were also generated to assess the role of γδT17 cells in this model. FSTL-1 Hypo mice had reduced K. pneumoniae lung burden compared with that of WT controls. FSTL-1 Hypo mice had increased Il17a/interleukin-17A (IL-17A) and IL-17-dependent cytokine expression. FSTL-1 Hypo lungs also had increased IL-17A+ and TCRγδ+ cells. FSTL-1 Hypo/TCRδ-/- displayed a lung burden similar to that of FSTL-1 Hypo and reduced lung burden compared with the TCRδ-/- controls. However, FSTL-1 Hypo/TCRδ-/- mice had greater bacterial dissemination than FSTL-1 Hypo mice, suggesting that gamma delta T (γδT) cells are dispensable for FSTL-1 Hypo control of pulmonary infection but are required for dissemination control. Confusing these observations, FSTL-1 Hypo/TCRδ-/- lungs had an increased percentage of IL-17A-producing cells compared with that of TCRδ-/- mice. Removal of IL-17A signaling in the FSTL-1 Hypo mouse resulted in an increased lung burden. These findings identify a novel role for FSTL-1 in innate lung immunity to bacterial infection, suggesting that FSTL-1 influences type-17 pulmonary bacterial immunity.
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25
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Guzman MI. An overview of the effect of bioaerosol size in coronavirus disease 2019 transmission. Int J Health Plann Manage 2020; 36:257-266. [PMID: 33295073 PMCID: PMC8049017 DOI: 10.1002/hpm.3095] [Citation(s) in RCA: 39] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2020] [Revised: 11/13/2020] [Accepted: 11/25/2020] [Indexed: 01/01/2023] Open
Abstract
The fast spread of coronavirus disease 2019 (COVID‐19) constitutes a worldwide challenge to the public health, educational and trade systems, affecting the overall well‐being of human societies. The high transmission and mortality rates of this virus, and the unavailability of a vaccine or treatment, resulted in the decision of multiple governments to enact measures of social distancing. Such measures can reduce the exposure to bioaerosols, which can result in pathogen deposition in the respiratory tract of the host causing disease and an immunological response. Thus, it is important to consider the validity of the proposal for keeping a distance of at least 2 m from other persons to avoid the spread of COVID‐19. This work reviews the effect of aerodynamic diameter (size) of particles carrying RNA copies of severe acute respiratory syndrome coronavirus 2 (SARS‐CoV‐2). A SARS‐CoV‐2 carrier person talking, sneezing or coughing at distance of 2 m can still provide a pathogenic bioaerosol load with submicron particles that remain viable in air for up to 3 h for exposure of healthy persons near and far from the source in a stagnant environment. The deposited bioaerosol creates contaminated surfaces, which if touched can act as a path to introduce the pathogen by mouth, nose or eyes and cause disease.
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Affiliation(s)
- Marcelo I Guzman
- Department of Chemistry, University of Kentucky, Lexington, Kentucky, USA
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26
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Innate Immune Effectors Play Essential Roles in Acute Respiratory Infection Caused by Klebsiella pneumoniae. J Immunol Res 2020; 2020:5291714. [PMID: 33163539 PMCID: PMC7607282 DOI: 10.1155/2020/5291714] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/16/2020] [Accepted: 10/12/2020] [Indexed: 12/24/2022] Open
Abstract
Innate immune effectors constitute the first line of host defense against pathogens. However, the roles of these effectors are not clearly defined during Klebsiella pneumoniae (K. pneumoniae) respiratory infection. In the current study, we established an acute pneumonia model of K. pneumoniae respiratory infection in mice and confirmed that the injury was most severe 48 h post infection. Flow cytometric assay demonstrated that alveolar macrophages were the predominant cells in BALF before infection, and neutrophils were quickly recruited after infection, and this was in consistent with the kinetics of chemokine expression. Further, we depleted neutrophils, macrophages, and complement pathways in vivo and challenged these mice with a sublethal dose of K. pneumonia, the result showed that 80%, 60%, and 40% of mice were died in these groups, respectively, while no deaths occurred in the control group. Besides, innate immune effector depleted mice showed higher bacterial burdens in lungs and blood, companied with more severe lung damage and increased levels of cytokine/chemokine expression. These results demonstrated that the innate immune effectors are critical in the early controlling of K. pneumoniae infection, and neutrophils are the most important. Thus, alternative strategies targeting these innate immune effectors may be effective in controlling of K. pneumoniae respiratory infection.
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27
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Luchsinger V, Lizama L, Garmendia ML, Tempio F, Ruiz M, Pizarro R, Rossi P, Huenchur L, Moreno C, López M, Ampuero S, Larrañaga C, Avendaño LF. Immunoglobulins concentration and B cell counts as severity markers in adult community-acquired pneumonia: Cross sectional study. Medicine (Baltimore) 2020; 99:e22390. [PMID: 33157914 PMCID: PMC7647610 DOI: 10.1097/md.0000000000022390] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
Abstract
Community-acquired pneumonia (CAP) is a worldwide cause of morbidity and mortality. Immunoglobulins (Igs) and B cells quantification studies in CAP are few and show discrepancies. Serum IgA acts as a powerful natural anti-inflammatory factor, but its role in the CAP has not yet been defined. The highly sensitive xMAP Luminex technique allows better immunoglobulins quantification. The aim of this study was to analyze the relation between clinical severity and circulating Igs and B cells in adults with CAP.Igs (M, A, G1, G2, G3, and G4) and B cells were quantified in peripheral blood of 190 Chilean patients ≥18 years old hospitalized for CAP and in 21 adults without respiratory disease, using xMAP Luminex and flow cytometry, respectively. Clinical history was recorded and PSI and CURB-65 scores were calculated for evaluation of clinical severity.The total IgM, IgG2 and total IgG levels were lower in CAP than in asymptomatic adults (P < .05). No significant differences of Igs levels were found between patients classified as severe and mild by PSI and CURB-65 scores. Fatal cases had higher levels of IgA (P < .05). No differences in CD19 B cells frequency was found between CAP and asymptomatic adults (P = .40). In PSI severe cases, CD19 B cells were significantly lower than in mild cases (P = .008). No differences were found in CURB-65 severe and mild groups (P = .11). In fatal cases (11/82) group, CD19 B cells frequency was lower than in 71 survivors (P = .2). No differences in memory B lymphocytes were detected between asymptomatic and CAP adults, severe and mild patients, survivors and fatal cases (P > .05).Serum IgA levels were significantly higher in fatal CAP cases, raising it as a potential biomarker for severe disease considering its relatively universal availability. In PSI severe patients, B cells showed lower levels and could have a role on its physiopathology. Finding new markers rooted in physiopathology could improve the possibility of scoring severe CAP cases. Luminex technology showed promising quantification serum Igs.
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Affiliation(s)
- Vivian Luchsinger
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
| | - Luis Lizama
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
| | | | - Fabián Tempio
- Programa de Inmunología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
- Instituto Milenio de Inmunología e Inmunoterapia, Facultad de Medicina
| | | | | | | | | | - Cristian Moreno
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
| | - Mercedes López
- Programa de Inmunología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
- Instituto Milenio de Inmunología e Inmunoterapia, Facultad de Medicina
| | - Sandra Ampuero
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
| | - Carmen Larrañaga
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
| | - Luis Fidel Avendaño
- Programa de Virología, ICBM: Programa de Virología, ICBM, Facultad de Medicina
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28
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Wu T, Xu F, Su C, Li H, Lv N, Liu Y, Gao Y, Lan Y, Li J. Alterations in the Gut Microbiome and Cecal Metabolome During Klebsiella pneumoniae-Induced Pneumosepsis. Front Immunol 2020; 11:1331. [PMID: 32849494 PMCID: PMC7411141 DOI: 10.3389/fimmu.2020.01331] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2020] [Accepted: 05/26/2020] [Indexed: 12/15/2022] Open
Abstract
Klebsiella (K.) pneumoniae is a common cause of pneumonia-derived sepsis in human and is associated with high morbidity and mortality. The microbiota promotes and maintains host immune homeostasis during bacterial infections. However, the mechanisms by which the gut microbiota affects immune responses in the lung still remain poorly understood. Here, we performed cecal metabolomics sequencing and fecal 16s rRNA sequencing in K. pneumoniae-infected mice and uninfected controls and showed that K. pneumoniae infection led to profound alterations in the gut microbiome and thus the cecal metabolome. We observed that the levels of Lactobacillus reuteri and Bifidobacterium pseudolongum were significantly decreased in K. pneumoniae-infected mice. Spearman correlation analysis showed that alterations in the richness and composition of the gut microbiota were associated with profound changes in host metabolite concentrations. Further, short-chain fatty acids (SCFAs), including acetate, propionate, and butyrate, were detected in cecal contents and serum by gas chromatography-mass spectrometry (GC-MS). We observed that the concentrations of these three SCFAs were all lower in the infected groups than in the untreated controls. Lastly, oral supplementation with these three SCFAs reduced susceptibility to K. pneumoniae infections, as indicated by lower bacterial burdens in the lung and higher survival rates. Our data highlight the protective roles of gut microbiota and certain metabolites in K. pneumoniae-pneumonia and suggests that it is possible to intervene in this bacterial pneumonia by targeting the gut microbiota.
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Affiliation(s)
- Ting Wu
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Fangming Xu
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Cong Su
- Department of Infectious Diseases, The Chaohu Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Hongru Li
- Department of Neurology, Xiangya Hospital Central South University, Changsha, China
| | - Na Lv
- Department of Stomatology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yanyan Liu
- Anhui Center for Surveillance of Bacterial Resistance, Hefei, China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, China
| | - Yufeng Gao
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Yanhu Lan
- Anhui Center for Surveillance of Bacterial Resistance, Hefei, China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, China
| | - Jiabin Li
- Department of Infectious Diseases, The First Affiliated Hospital of Anhui Medical University, Hefei, China.,Department of Infectious Diseases, The Chaohu Affiliated Hospital of Anhui Medical University, Hefei, China.,Anhui Center for Surveillance of Bacterial Resistance, Hefei, China.,Institute of Bacterial Resistance, Anhui Medical University, Hefei, China
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29
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Deficiency of the Transcription Factor NR4A1 Enhances Bacterial Clearance and Prevents Lung Injury During Escherichia Coli Pneumonia. Shock 2020; 51:787-794. [PMID: 29846361 DOI: 10.1097/shk.0000000000001184] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
BACKGROUND Bacterial pneumonia is one of the most common diagnoses and a leading cause of death in the intensive care unit. NR4A1 is an early response gene that has been identified as a vital regulator of immune and inflammatory responses. This study aims to explore the role of NR4A1 in Escherichia coli (E. coli) pneumonia. METHODS Alveolar macrophages (AMs) were isolated from wild-type (WT) and NR4A1 knock out (Nr4a1) mice, and the NR4A1 expression and phagocytic capacity against E. coli were measured in vitro. WT and Nr4a1 mice were subjected to E. coli or sham pneumonia. Bacterial load, lung injury severity, inflammatory cell infiltration, and cytokines were assessed at 0, 4, and 18 h after surgery. Survival rates within 48 h were evaluated in WT and Nr4a1 mice. In addition, NR4A1 antagonist (DIM-C-pPhCO2Me) was also used to confirm the role of NR4A1 in vivo and ex vivo. RESULTS NR4A1 was rapidly induced in AMs at 15 min after E. coli stimulation. Compared with untreated WT AMs, NR4A1 deficiency and DIM-C-pPhCO2Me treatment showed an enhanced phagocytic function (47.72 ± 0.74% vs. 62.3 ± 0.9%, P < 0.001; 11.79 ± 1.21% vs. 30.08 ± 0.79%, P < 0.001, respectively) at 30 min after the E. coli challenge in vitro. NR4A1 deficiency significantly improved the survival rate (33.3% in WT vs. 82.4% in Nr4a1, P < 0.01), which is comparable with DIM-C-pPhCO2Me pretreatment. The survival advantage of Nr4a1 mice was associated with decreased bacterial burden and inflammation and alleviated lung damage. CONCLUSIONS These data demonstrate that NR4A1 impairs the phagocytic capacity of AMs and disrupts the host defense against invading bacteria, worsening the outcome of E. coli pneumonia in mice.
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30
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FitzGerald ES, Luz NF, Jamieson AM. Competitive Cell Death Interactions in Pulmonary Infection: Host Modulation Versus Pathogen Manipulation. Front Immunol 2020; 11:814. [PMID: 32508813 PMCID: PMC7248393 DOI: 10.3389/fimmu.2020.00814] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 04/08/2020] [Indexed: 12/12/2022] Open
Abstract
In the context of pulmonary infection, both hosts and pathogens have evolved a multitude of mechanisms to regulate the process of host cell death. The host aims to rapidly induce an inflammatory response at the site of infection, promote pathogen clearance, quickly resolve inflammation, and return to tissue homeostasis. The appropriate modulation of cell death in respiratory epithelial cells and pulmonary immune cells is central in the execution of all these processes. Cell death can be either inflammatory or anti-inflammatory depending on regulated cell death (RCD) modality triggered and the infection context. In addition, diverse bacterial pathogens have evolved many means to manipulate host cell death to increase bacterial survival and spread. The multitude of ways that hosts and bacteria engage in a molecular tug of war to modulate cell death dynamics during infection emphasizes its relevance in host responses and pathogen virulence at the host pathogen interface. This narrative review outlines several current lines of research characterizing bacterial pathogen manipulation of host cell death pathways in the lung. We postulate that understanding these interactions and the dynamics of intracellular and extracellular bacteria RCD manipulation, may lead to novel therapeutic approaches for the treatment of intractable respiratory infections.
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Affiliation(s)
| | | | - Amanda M. Jamieson
- Division of Biology and Medicine, Department of Molecular Microbiology and Immunology, Brown University, Providence, RI, United States
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31
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Fekrvand S, Yazdani R, Olbrich P, Azizi G, Shirzadi R, Modaresi M, Sohani M, Delavari S, Kalantari A, Shariat M, Shafiei A, Lu N, Hassanpour G, Rahimi Hajiabadi M, Ashournia P, Razaghian A, Asgharyan M, Shahraki-Ghadimi Z, Rouhani R, Hoda Fallah F, Rezaei N, Abolhassani H, Aghamohammadi A. Evaluation of respiratory complications in patients with X-linked and autosomal recessive agammaglobulinemia. Pediatr Allergy Immunol 2020; 31:405-417. [PMID: 32058651 DOI: 10.1111/pai.13228] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 01/23/2020] [Accepted: 01/24/2020] [Indexed: 01/10/2023]
Abstract
BACKGROUND Congenital agammaglobulinemia is the first primary immunodeficiency disorder characterized by a defect in B lymphocyte development and subsequently decreased immunoglobulin levels. These patients are prone to suffer from recurrent infections mostly involving the respiratory tract. In this study, we aimed to describe in detail respiratory tract complications as the most prominent clinical feature among agammaglobulinemic patients. METHODS A total number of 115 patients were included. Demographic, clinical, and genetic data were collected from the patients' medical records. Among the available patients, pulmonary function tests (PFTs) and/or high-resolution computed tomography (HRCT) were performed. RESULTS Respiratory tract complications (85.2%) especially pneumonia (62.6%) were the most prominent clinical features in our cohort. Among patients with abnormal PFT results (N = 19), a mixed respiratory pattern was observed in 36.8%. HRCT was carried out in 29 patients; Bhalla scoring-based evaluation of these patients indicated excellent (44.8%), followed by good (34.5%) and mild (20.7%) results. Bronchiectasis was found in 13 patients undergoing HRCT (44.8%). We found significant inverse correlations between the Bhalla score and incidence rate of pneumonia, as well as the presence of bronchiectasis. Patients with abnormal PFT results had statistically significant higher bronchiectasis frequency and lower Bhalla scores compared to those with normal results. Forty-one patients were deceased, and here, respiratory failure was the most common cause of death (45.5%). CONCLUSION High prevalence of respiratory tract infections among agammaglobulinemic patients and subsequent progression to permanent lung damage highlights the importance of implementing respiratory evaluation as part of routine follow-up program of agammaglobulinemic patients. Physicians should be aware of this and regularly monitor the respiratory function of these patients to allow for timely diagnosis and treatment initiation aiming to improve patients' prognosis and quality of life.
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Affiliation(s)
- Saba Fekrvand
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Reza Yazdani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Peter Olbrich
- Sección de Infectología e Inmunopatología, Unidad de Pediatría, Hospital Virgen del Rocío/Instituto de Biomedicina de Sevilla (IBiS), Seville, Spain
| | - Gholamreza Azizi
- Non-Communicable Diseases Research Center, Alborz University of Medical Sciences, Karaj, Iran
| | - Rohola Shirzadi
- Department of Pediatric Pulmonary and Sleep Medicine, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammadreza Modaresi
- Department of Pediatric Pulmonary and Sleep Medicine, Children Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahsa Sohani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Samaneh Delavari
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Arash Kalantari
- Department of Immunology and Allergy, Imam Khomeini Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Mansoureh Shariat
- Department of Allergy and Clinical Immunology, Children's Medical Center, Tehran University of Medical Sciences, Tehran, Iran
| | - Alireza Shafiei
- The Department of Immunology, Bahrami Hospital, Tehran University of Medical Sciences, Tehran, Iran
| | - Na Lu
- State Key Lab of Bioelectronics, School of Biological Science and Medical Engineering, Southeast University, Nanjing, China
| | - Gholamreza Hassanpour
- Center for Research of Endemic Parasites of Iran, Tehran University of Medical Sciences, Tehran, Iran
| | - Maziar Rahimi Hajiabadi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Parisa Ashournia
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Anahita Razaghian
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Marzieh Asgharyan
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Zahra Shahraki-Ghadimi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Roja Rouhani
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Fatemeh Hoda Fallah
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
| | - Nima Rezaei
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran.,Network for Immunology in Infection, Malignancy, and Autoimmunity (NIIMA), Universal Scientific Education and Research Network (USERN), Tehran, Iran
| | - Hassan Abolhassani
- Research Center for Primary Immunodeficiencies, Iran University of Medical Sciences, Tehran, Iran.,Division of Clinical Immunology, Department of Laboratory Medicine, Karolinska Institutet at the Karolinska University Hospital Huddinge, Stockholm, Sweden
| | - Asghar Aghamohammadi
- Research Center for Immunodeficiencies, Pediatrics Center of Excellence, Children's Medical Center, Tehran University of Medical Science, Tehran, Iran
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32
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Treatment update: Outpatient management of community-acquired pneumonia. Nurse Pract 2020; 45:16-25. [PMID: 32015283 DOI: 10.1097/01.npr.0000653944.99226.25] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Pneumonia is a leading cause of morbidity and mortality in the US and a primary cause of hospitalization nationwide. A recent guideline update from the American Thoracic Society and Infectious Diseases Society of America provides evidence-based recommendations for managing adults with community-acquired pneumonia in the outpatient setting.
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33
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LeMessurier KS, Tiwary M, Morin NP, Samarasinghe AE. Respiratory Barrier as a Safeguard and Regulator of Defense Against Influenza A Virus and Streptococcus pneumoniae. Front Immunol 2020; 11:3. [PMID: 32117216 PMCID: PMC7011736 DOI: 10.3389/fimmu.2020.00003] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 01/03/2020] [Indexed: 12/27/2022] Open
Abstract
The primary function of the respiratory system of gas exchange renders it vulnerable to environmental pathogens that circulate in the air. Physical and cellular barriers of the respiratory tract mucosal surface utilize a variety of strategies to obstruct microbe entry. Physical barrier defenses including the surface fluid replete with antimicrobials, neutralizing immunoglobulins, mucus, and the epithelial cell layer with rapidly beating cilia form a near impenetrable wall that separates the external environment from the internal soft tissue of the host. Resident leukocytes, primarily of the innate immune branch, also maintain airway integrity by constant surveillance and the maintenance of homeostasis through the release of cytokines and growth factors. Unfortunately, pathogens such as influenza virus and Streptococcus pneumoniae require hosts for their replication and dissemination, and prey on the respiratory tract as an ideal environment causing severe damage to the host during their invasion. In this review, we outline the host-pathogen interactions during influenza and post-influenza bacterial pneumonia with a focus on inter- and intra-cellular crosstalk important in pulmonary immune responses.
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Affiliation(s)
- Kim S LeMessurier
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Division of Pulmonology, Allergy-Immunology, and Sleep, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Le Bonheur Children's Hospital, Children's Foundation Research Institute, Memphis, TN, United States
| | - Meenakshi Tiwary
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Division of Pulmonology, Allergy-Immunology, and Sleep, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Le Bonheur Children's Hospital, Children's Foundation Research Institute, Memphis, TN, United States
| | - Nicholas P Morin
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Division of Critical Care Medicine, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States
| | - Amali E Samarasinghe
- Department of Pediatrics, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Division of Pulmonology, Allergy-Immunology, and Sleep, College of Medicine, University of Tennessee Health Science Center, Memphis, TN, United States.,Le Bonheur Children's Hospital, Children's Foundation Research Institute, Memphis, TN, United States
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Role of macrophage TRPV4 in inflammation. J Transl Med 2020; 100:178-185. [PMID: 31645630 PMCID: PMC7261496 DOI: 10.1038/s41374-019-0334-6] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/19/2019] [Accepted: 08/30/2019] [Indexed: 01/05/2023] Open
Abstract
Transient receptor ion channels have emerged as immensely important channels/receptors in diverse physiological and pathological responses. Of particular interest is the transient receptor potential channel subfamily V member 4 (TRPV4), which is a polymodal, nonselective, calcium-permeant cation channel, and is activated by both endogenous and exogenous stimuli. Both neuronal and nonneuronal cells express functional TRPV4, which is responsive to a variety of biochemical and biomechanical stimuli. Emerging discoveries have advanced our understanding of the role of macrophage TRPV4 in numerous inflammatory diseases. In lung injury, TRPV4 mediates macrophage phagocytosis, secretion of pro-resolution cytokines, and generation of reactive oxygen species. TRPV4 regulates lipid-laden macrophage foam cell formation, the hallmark of atheroinflammatory conditions, in response to matrix stiffness and lipopolysaccharide stimulation. Accumulating data also point to a role of macrophage TRPV4 in the pathogenesis of the foreign body response, a chronic inflammatory condition, through the formation of foreign body giant cells. Deletion of TRPV4 in macrophages suppresses the allergic and nonallergic itch in a mouse model, suggesting a role of TRPV4 in skin disease. Here, we discuss the current understanding of the role of macrophage TRPV4 in various inflammatory conditions.
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Scheraga RG, Abraham S, Grove LM, Southern BD, Crish JF, Perelas A, McDonald C, Asosingh K, Hasday JD, Olman MA. TRPV4 Protects the Lung from Bacterial Pneumonia via MAPK Molecular Pathway Switching. THE JOURNAL OF IMMUNOLOGY 2020; 204:1310-1321. [PMID: 31969384 DOI: 10.4049/jimmunol.1901033] [Citation(s) in RCA: 41] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2019] [Accepted: 12/22/2019] [Indexed: 12/11/2022]
Abstract
Mechanical cell-matrix interactions can drive the innate immune responses to infection; however, the molecular underpinnings of these responses remain elusive. This study was undertaken to understand the molecular mechanism by which the mechanosensitive cation channel, transient receptor potential vanilloid 4 (TRPV4), alters the in vivo response to lung infection. For the first time, to our knowledge, we show that TRPV4 protects the lung from injury upon intratracheal Pseudomonas aeruginosa in mice. TRPV4 functions to enhance macrophage bacterial clearance and downregulate proinflammatory cytokine secretion. TRPV4 mediates these effects through a novel mechanism of molecular switching of LPS signaling from predominant activation of the MAPK, JNK, to that of p38. This is accomplished through the activation of the master regulator of inflammation, dual-specificity phosphatase 1. Further, TRPV4's modulation of the LPS signal is mechanosensitive in that both upstream activation of p38 and its downstream biological consequences depend on pathophysiological range extracellular matrix stiffness. We further show the importance of TRPV4 on LPS-induced activation of macrophages from healthy human controls. These data are the first, to our knowledge, to demonstrate new roles for macrophage TRPV4 in regulating innate immunity in a mechanosensitive manner through the modulation of dual-specificity phosphatase 1 expression to mediate MAPK activation switching.
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Affiliation(s)
- Rachel G Scheraga
- Respiratory Institute, Cleveland Clinic, Cleveland, OH 44195; .,Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - Susamma Abraham
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - Lisa M Grove
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - Brian D Southern
- Respiratory Institute, Cleveland Clinic, Cleveland, OH 44195.,Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - James F Crish
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | | | - Christine McDonald
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - Kewal Asosingh
- Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
| | - Jeffrey D Hasday
- Department of Pulmonary and Critical Care, University of Maryland, Baltimore, MD 21201
| | - Mitchell A Olman
- Respiratory Institute, Cleveland Clinic, Cleveland, OH 44195; .,Department of Inflammation and Immunity, Lerner Research Institute, Cleveland Clinic, Cleveland, OH 44195; and
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36
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Gao F, Cai MX, Lin MT, Zhang LZ, Ruan QZ, Gao F. Model for end-stage liver disease and pneumonia: An improved scoring model for critically ill cirrhotic patients with pneumonia. TURKISH JOURNAL OF GASTROENTEROLOGY 2020; 30:532-540. [PMID: 31144659 DOI: 10.5152/tjg.2019.18421] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
BACKGROUND/AIMS Critically ill patients with cirrhosis with pneumonia are at an increased risk for mortality. Only a few accurate predictive models are existing specific to these patients. The aim of the present study was to compare the existing prognostic models and to develop an improved mortality risk model for patients with cirrhosis and pneumonia. MATERIALS AND METHODS A total of 231 patients were enrolled in our study (70% training and 30% validation cohorts). All participants were followed up for at least 21 days. Model for End-stage Liver Disease and Pneumonia (MELD-P) was derived by the Cox proportional hazards model. The performances of prognostic scoring systems were compared by calculation of the area under the receiver operating characteristic (AUROC) curve. RESULTS MELD-P showed better discriminative capabilities than existing scoring systems. Four clinical variables, including loge bilirubin (hazard ratio (HR) 1.29, 95% confidence interval (CI) 1.01-1.73), loge international normalized ratio (HR 3.57, 95% CI 1.30-9.78), loge pulse oxygen saturation/fraction of inspired oxygen (HR 0.38, 95% CI 0.14-0.99), and vasopressors used (HR 3.72, 95% CI 1.85-7.49), were considered as independent prognostic values associated with 21-day mortality. MELD-P had AUROC curve values of 0.78 (95% CI 0.71-0.84) in predicting in-hospital mortality, 0.78 (95% CI 0.70-0.84) at 21-day, 0.88 (95% CI 0.82-0.93) at 14-day, and 0.87 (95% CI 0.81-0.92) at 7-day. A similar result was obtained in validation cohort. CONCLUSION MELD-P, as the first model specifically designed to evaluate the risk of mortality in critically ill patients with cirrhosis and pneumonia, performs well on the mortality assessment of short-term mortality.
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Affiliation(s)
- Feng Gao
- Department of Gastroenterology and Hepatology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Meng-Xing Cai
- Department of Cardiovascular Medicine, the Heart Center, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Miao-Tong Lin
- Department of Emergency Medicine, Intensive Care, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Ling-Zhi Zhang
- Department of Electrocardiogram, the First People's Hospital of Wenling, Wenling, China
| | - Qian-Zi Ruan
- Department of Bone and Joint Surgery, the First People's Hospital of Wenling, Wenling, China
| | - Feng Gao
- Department of Gastroenterology and Hepatology, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
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Bekking C, Yip L, Groulx N, Doggett N, Finn M, Mubareka S. Evaluation of bioaerosol samplers for the detection and quantification of influenza virus from artificial aerosols and influenza virus-infected ferrets. Influenza Other Respir Viruses 2019; 13:564-573. [PMID: 31541519 PMCID: PMC6800310 DOI: 10.1111/irv.12678] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 08/26/2019] [Accepted: 09/03/2019] [Indexed: 12/25/2022] Open
Abstract
BACKGROUND Bioaerosol sampling devices are necessary for the characterization of infectious bioaerosols emitted by naturally-infected hosts with acute respiratory virus infections. Assessment of these devices under multiple experimental conditions will provide insight for device use. OBJECTIVES The primary objective of this study was to assess and compare bioaerosol sampling devices using a) an in vitro, environmentally-controlled artificial bioaerosol system at a range of different RH conditions and b) an in vivo bioaerosol system of influenza virus-infected ferrets under controlled environmental conditions. Secondarily, we also sought to examine the impact of NSAIDs on bioaerosol emission in influenza virus-infected ferrets to address its potential as a determinant of bioaerosol emission. METHODS We examined the performance of low and moderate volume bioaerosol samplers for the collection of viral RNA and infectious influenza virus in vitroand in vivo using artificial bioaerosols and the ferret model of influenza virus infection. The following samplers were tested: the polytetrafluoroethylene filter (PTFE filter), the 2-stage National Institute of Occupational Safety and Health cyclone sampler (NIOSH cyclone sampler) and the 6-stage viable Andersen impactor (Andersen impactor). RESULTS The PTFE filter and NIOSH cyclone sampler collected similar amounts of viral RNA and infectious virus from artificially-generated aerosols under a range of relative humidities (RH). Using the ferret model, the PTFE filter, NIOSH cyclone sampler and the Andersen impactor collected up to 3.66 log10 copies of RNA/L air, 3.84 log10 copies of RNA/L air and 6.09 log10 copies of RNA/L air respectively at peak recovery. Infectious virus was recovered from the PTFE filter and NIOSH cyclone samplers on the peak day of viral RNA recovery. CONCLUSION The PTFE filter and NIOSH cyclone sampler are useful for influenza virus RNA and infectious virus collection and may be considered for clinical and environmental settings.
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Affiliation(s)
- Christian Bekking
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
| | - Lily Yip
- Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
| | - Nicolas Groulx
- Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
| | - Nathan Doggett
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
| | - Mairead Finn
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
| | - Samira Mubareka
- Department of Laboratory Medicine and Pathobiology, Faculty of Medicine, University of Toronto, Toronto, Ontario, Canada.,Biological Sciences, Sunnybrook Research Institute, Toronto, Ontario, Canada
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38
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Mesenchymal Stem Cell-Based Therapy of Inflammatory Lung Diseases: Current Understanding and Future Perspectives. Stem Cells Int 2019; 2019:4236973. [PMID: 31191672 PMCID: PMC6525794 DOI: 10.1155/2019/4236973] [Citation(s) in RCA: 125] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2018] [Revised: 02/06/2019] [Accepted: 02/14/2019] [Indexed: 12/16/2022] Open
Abstract
During acute or chronic lung injury, inappropriate immune response and/or aberrant repair process causes irreversible damage in lung tissue and most usually results in the development of fibrosis followed by decline in lung function. Inhaled corticosteroids and other anti-inflammatory drugs are very effective in patients with inflammatory lung disorders, but their long-term use is associated with severe side effects. Accordingly, new therapeutic agents that will attenuate ongoing inflammation and, at the same time, promote regeneration of injured alveolar epithelial cells are urgently needed. Mesenchymal stem cells (MSCs) are able to modulate proliferation, activation, and effector function of all immune cells that play an important role in the pathogenesis of acute and chronic inflammatory lung diseases. In addition to the suppression of lung-infiltrated immune cells, MSCs have potential to differentiate into alveolar epithelial cells in vitro and, accordingly, represent new players in cell-based therapy of inflammatory lung disorders. In this review article, we described molecular mechanisms involved in MSC-based therapy of acute and chronic pulmonary diseases and emphasized current knowledge and future perspectives related to the therapeutic application of MSCs in patients suffering from acute respiratory distress syndrome, pneumonia, asthma, chronic obstructive pulmonary diseases, and idiopathic pulmonary fibrosis.
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39
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Sun S, Tian L, Cao W, Lai PC, Wong PPY, Lee RSY, Mason TG, Krämer A, Wong CM. Urban climate modified short-term association of air pollution with pneumonia mortality in Hong Kong. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 646:618-624. [PMID: 30059922 DOI: 10.1016/j.scitotenv.2018.07.311] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2018] [Revised: 07/05/2018] [Accepted: 07/20/2018] [Indexed: 06/08/2023]
Abstract
BACKGROUND City is becoming warmer, especially in the process of urbanization and climate change. However, it is largely unknown whether this warming urban climate may modify the short-term effects of air pollution. OBJECTIVES To test whether warmer urban climates intensify the acute mortality effects of air pollution on pneumonia in Hong Kong. METHODS Participants who died of pneumonia from a prospective Chinese elderly cohort between 1998 and 2011 were selected as cases. Urban climatic (UC) classes of cases were determined by an established Urban Climatic Map according to their residential addresses. UC classes were first dichotomized into cool and warm climates and case-crossover analysis was used to estimate the short-term association of pneumonia mortality with air pollution. We further classified UC classes into climate quartiles and used case-only analysis to test the trend of urban climate modification on the short-term association of pneumonia mortality with air pollution. RESULTS Among 66,820 elders (≥65 years), 2208 pneumonia deaths (cases) were identified during the 11-14 years of follow-up. The effects of air pollution for cases residing in the warm climate were statistically significant (p < 0.05) higher than those living in the cool climate. There was an increasing linear trend of urban climate modification on the association of pneumonia mortality with NO2 (nitrogen dioxide) (p for trend = 0.035). Compared to climate Quartile 1 (the lowest), deaths resided in climate Quartile 2, 3, and 4 (the highest) were associated with an additional percent change of 9.07% (0.52%, 17.62%), 12.89% (4.34%, 21.43%), and 8.45% (-0.10%, 17.00%), respectively. CONCLUSIONS Warmer urban climate worsened the acute mortality effects of pneumonia associated with air pollutants in Hong Kong. Our findings suggest that warmer urban climate introduced by climate change and urbanization may increase the risks of air pollution-related pneumonia.
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Affiliation(s)
- Shengzhi Sun
- School of Public Health, The University of Hong Kong, Hong Kong SAR, China; Department of Epidemiology, Brown University School of Public Health, Providence, RI, USA
| | - Linwei Tian
- School of Public Health, The University of Hong Kong, Hong Kong SAR, China.
| | - Wangnan Cao
- Public Health and Healthy Ageing Research Group, Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, China
| | - Poh-Chin Lai
- Department of Geography, Faculty of Social Sciences, The University of Hong Kong, Hong Kong SAR, China
| | | | - Ruby Siu-Yin Lee
- Elderly Health Service, Department of Health, Hong Kong Special Administrative Region, China
| | - Tonya G Mason
- School of Public Health, The University of Hong Kong, Hong Kong SAR, China
| | - Alexander Krämer
- Department of Public Health Medicine, School of Public Health, University of Bielefeld, Bielefeld, Germany
| | - Chit-Ming Wong
- School of Public Health, The University of Hong Kong, Hong Kong SAR, China
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40
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Yao Y, Jeyanathan M, Haddadi S, Barra NG, Vaseghi-Shanjani M, Damjanovic D, Lai R, Afkhami S, Chen Y, Dvorkin-Gheva A, Robbins CS, Schertzer JD, Xing Z. Induction of Autonomous Memory Alveolar Macrophages Requires T Cell Help and Is Critical to Trained Immunity. Cell 2018; 175:1634-1650.e17. [DOI: 10.1016/j.cell.2018.09.042] [Citation(s) in RCA: 163] [Impact Index Per Article: 27.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 08/20/2018] [Accepted: 09/19/2018] [Indexed: 01/17/2023]
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Jondle CN, Gupta K, Mishra BB, Sharma J. Klebsiella pneumoniae infection of murine neutrophils impairs their efferocytic clearance by modulating cell death machinery. PLoS Pathog 2018; 14:e1007338. [PMID: 30273394 PMCID: PMC6181436 DOI: 10.1371/journal.ppat.1007338] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2018] [Revised: 10/11/2018] [Accepted: 09/14/2018] [Indexed: 12/16/2022] Open
Abstract
Neutrophils are the first infiltrating cell type essential for combating pneumoseptic infections by bacterial pathogens including Klebsiella pneumoniae (KPn). Following an infection or injury, removal of apoptotic infiltrates via a highly regulated process called efferocytosis is required for restoration of homeostasis, but little is known regarding the effect of bacterial infection on this process. Here we demonstrate that KPn infection impedes the efferocytic uptake of neutrophils in-vitro and in-vivo in lungs by macrophages. This impaired efferocytosis of infected neutrophils coincides with drastic reduction in the neutrophil surface exposure of apoptosis signature phospholipid phosphatidyserine (PS); and increased activity of phospholipid transporter flippases, which maintain PS in the inner leaflet of plasma membrane. Concomitantly, pharmacological inhibition of flippase activity enhanced PS externalization and restored the efferocytosis of KPn infected neutrophils. We further show that KPn infection interferes with apoptosis activation and instead activates non-apoptotic programmed cell death via activation of necroptosis machinery in neutrophils. Accordingly, pharmacological inhibition of necroptosis by RIPK1 and RIPK3 inhibitors restored the efferocytic uptake of KPn infected neutrophils in-vitro. Importantly, treatment of KPn infected mice with necroptosis inhibitor improved the disease outcome in-vivo in preclinical mouse model of KPn pneumonia. To our knowledge, this is the first report of neutrophil efferocytosis impairment by KPn via modulation of cell death pathway, which may provide novel targets for therapeutic intervention of this infection. Inflammatory diseases caused by infectious or sterile injuries are often characterized by pathological accumulation of dead or dying infiltrating cells. Pneumonic sepsis caused by Klebsiella pneumoniae (KPn), an opportunistic pathogen, has similar etiology, however, the underlying mechanism remains unknown. Here we report that KPn infection subverts a protective host process termed efferocytosis, by which the phagocytic cells engulf and clear dead/dying cells thereby resolving inflammation and infection. Our results show that KPn infected neutrophils are cleared less efficiently via efferocytosis than the uninfected neutrophils. Mechanistic studies implicated a reduced exposure of “eat me” signal phosphatidyleserine (PS) via increased flippase activity and skewing of cell death pathway toward necroptosis in impaired efferocytosis of infected neutrophils. Accordingly, pharmacological reversal of PS exposure by flippase inhibition, treatment with necroptosis inhibitors restored the efferocytic clearance of KPn infected neutrophils, and improved the disease outcome in a preclinical model of pneumonic sepsis. To our knowledge this is the first report of KPn subversion of efferocytic clearance of neutrophils by impairing pro-efferocytic apoptotic signatures and activation of necroptosis machinery. This could lead to novel therapeutic targets against KPn infection and associated inflammation in pneumonic sepsis.
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Affiliation(s)
- Christopher N. Jondle
- Department of Basic Biomedical Sciences, The University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, United States of America
| | - Kuldeep Gupta
- Department of Basic Biomedical Sciences, The University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, United States of America
| | - Bibhuti B. Mishra
- Department of Basic Biomedical Sciences, The University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, United States of America
| | - Jyotika Sharma
- Department of Basic Biomedical Sciences, The University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, United States of America
- * E-mail:
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Tripathi JK, Sharma A, Sukumaran P, Sun Y, Mishra BB, Singh BB, Sharma J. Oxidant sensor cation channel TRPM2 regulates neutrophil extracellular trap formation and protects against pneumoseptic bacterial infection. FASEB J 2018; 32:fj201800605. [PMID: 29906250 PMCID: PMC6219830 DOI: 10.1096/fj.201800605] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 06/04/2018] [Indexed: 12/17/2022]
Abstract
Neutrophil extracellular trap (NET) formation constitutes an important extracellular antimicrobial function of neutrophils that plays a protective role in bacterial pneumonia. Formation of reactive oxygen species (ROS) such as highly diffusible hydrogen peroxide (H2O2) is a hallmark of oxidative stress during inflammatory lung conditions including pneumonia. However, the impact of exogenous ROS on NET formation and the signaling pathway involved in the process is not completely understood. Here we demonstrate that the ROS-sensing, nonselective, calcium-permeable channel transient receptor potential melastatin 2 (TRPM2) is required for NET formation in response to exogenous H2O2. This TRPM2-dependent H2O2-mediated NET formation involved components of autophagy and activation of AMPK and p38 MAPK, but not PI3K and AKT. Primary neutrophils from Trpm2-/- mice fail to activate this pathway with a block in NET release and a concomitant decrease in their antimicrobial capacity. Consequently, Trpm2-/- mice were highly susceptible to pneumonic infection with Klebsiella pneumoniae owing to an impaired NET formation and high bacterial burden despite increased neutrophil infiltration in their lungs. These results identify a key role of TRPM2 in regulating NET formation by exogenous ROS via AMPK/p38 activation and autophagy machinery, as well as a protective antimicrobial role of TRPM2 in pneumonic bacterial infection.-Tripathi, J. K., Sharma, A., Sukumaran, P., Sun, Y., Mishra, B. B., Singh, B. B., Sharma, J. Oxidant sensor cation channel TRPM2 regulates neutrophil extracellular trap formation and protects against pneumoseptic bacterial infection.
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Affiliation(s)
| | | | | | | | - Bibhuti Bhusan Mishra
- Department of Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, USA
| | | | - Jyotika Sharma
- Department of Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, North Dakota, USA
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Sham HP, Walker KH, Abdulnour REE, Krishnamoorthy N, Douda DN, Norris PC, Barkas I, Benito-Figueroa S, Colby JK, Serhan CN, Levy BD. 15-epi-Lipoxin A 4, Resolvin D2, and Resolvin D3 Induce NF-κB Regulators in Bacterial Pneumonia. THE JOURNAL OF IMMUNOLOGY 2018. [PMID: 29523657 DOI: 10.4049/jimmunol.1602090] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Specialized proresolving mediators (SPMs) decrease NF-κB activity to prevent excessive tissue damage and promote the resolution of acute inflammation. Mechanisms for NF-κB regulation by SPMs remain to be determined. In this study, after LPS challenge, the SPMs 15-epi-lipoxin A4 (15-epi-LXA4), resolvin D1, resolvin D2, resolvin D3, and 17-epi-resolvin D1 were produced in vivo in murine lungs. In LPS-activated human bronchial epithelial cells, select SPMs increased expression of the NF-κB regulators A20 and single Ig IL-1R-related molecule (SIGIRR). Of interest, 15-epi-LXA4 induced A20 and SIGIRR in an lipoxin A4 receptor/formyl peptide receptor 2 (ALX/FPR2) receptor-dependent manner in epithelial cells and in murine pneumonia. This SPM regulated NF-κB-induced cytokines to decrease pathogen-mediated inflammation. In addition to dampening lung inflammation, surprisingly, 15-epi-LXA4 also enhanced pathogen clearance with increased antimicrobial peptide expression. Taken together, to our knowledge these results are the first to identify endogenous agonists for A20 and SIGIRR expression to regulate NF-κB activity and to establish mechanisms for NF-κB regulation by SPMs for pneumonia resolution.
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Affiliation(s)
- Ho Pan Sham
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Katherine H Walker
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Raja-Elie E Abdulnour
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Nandini Krishnamoorthy
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - David N Douda
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Paul C Norris
- Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115
| | - Ioanna Barkas
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Sarah Benito-Figueroa
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Jennifer K Colby
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
| | - Charles N Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115
| | - Bruce D Levy
- Pulmonary and Critical Care Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA 02115; and
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Prognostic values of pneumonia severity index, CURB-65 and expanded CURB-65 scores in community-acquired pneumonia in Zagazig University Hospitals. EGYPTIAN JOURNAL OF CHEST DISEASES AND TUBERCULOSIS 2017. [DOI: 10.1016/j.ejcdt.2017.01.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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45
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Joseph S, Yuen A, Singh V, Hmama Z. Mycobacterium tuberculosis Cpn60.2 (GroEL2) blocks macrophage apoptosis via interaction with mitochondrial mortalin. Biol Open 2017; 6:481-488. [PMID: 28288970 PMCID: PMC5399554 DOI: 10.1242/bio.023119] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Earlier studies suggested that Mycobacterium tuberculosis (Mtb) proteins exported within the host macrophage play an essential role in tuberculosis pathogenesis. In fact, Mtb proteins interact with and deactivate key regulators of many macrophage functions such as phago-lysosome fusion and antigen presentation, resulting in the intracellular persistence of pathogenic mycobacteria. Cpn60.2 is an abundant Mtb chaperone protein, restricted to cell cytoplasm and surface, that was reported to be essential for bacterial growth. Here, we provide evidence that once Mtb is ingested by the macrophage, Cpn60.2 is able to detach from the bacterial surface and crosses the phagosomal membrane towards mitochondria organelles. Once there, Cpn60.2 interacts with host mortalin, a member of the HSP 70 gene family that contributes to apoptosis modulation. In this regard, we showed that Cpn60.2 blocks macrophage apoptosis, a phenotype that is reversed when cells are pretreated with a specific mortalin inhibitor. Our findings have extended the current knowledge of the Mtb Cpn60.2 functions to add a strong anti-apoptotic activity dependent on its interaction with mitochondrial mortalin, which otherwise promotes Mtb survival in the hostile macrophage environment.
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Affiliation(s)
- Sunil Joseph
- Division of Infectious Diseases, Department of Medicine, Vancouver Costal Health Research Institute, University of British Columbia, Vancouver, British Columbia V6H 3Z6, Canada
| | - Alex Yuen
- Division of Infectious Diseases, Department of Medicine, Vancouver Costal Health Research Institute, University of British Columbia, Vancouver, British Columbia V6H 3Z6, Canada
| | - Vijender Singh
- Division of Infectious Diseases, Department of Medicine, Vancouver Costal Health Research Institute, University of British Columbia, Vancouver, British Columbia V6H 3Z6, Canada
| | - Zakaria Hmama
- Division of Infectious Diseases, Department of Medicine, Vancouver Costal Health Research Institute, University of British Columbia, Vancouver, British Columbia V6H 3Z6, Canada
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Abdulnour REE, Sham HP, Douda DN, Colas RA, Dalli J, Bai Y, Ai X, Serhan CN, Levy BD. Aspirin-triggered resolvin D1 is produced during self-resolving gram-negative bacterial pneumonia and regulates host immune responses for the resolution of lung inflammation. Mucosal Immunol 2016; 9:1278-87. [PMID: 26647716 PMCID: PMC5107310 DOI: 10.1038/mi.2015.129] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2015] [Accepted: 10/10/2015] [Indexed: 02/04/2023]
Abstract
Bacterial pneumonia is a leading cause of morbidity and mortality worldwide. Host responses to contain infection and mitigate pathogen-mediated lung inflammation are critical for pneumonia resolution. Aspirin-triggered resolvin D1 (AT-RvD1; 7S,8R,17R-trihydroxy-4Z,9E,11E,13Z,15E,19Z-docosahexaenoic acid) is a lipid mediator (LM) that displays organ-protective actions in sterile lung inflammation, and regulates pathogen-initiated cellular responses. Here, in a self-resolving murine model of Escherichia coli pneumonia, LM metabololipidomics performed on lungs obtained at baseline, 24, and 72 h after infection uncovered temporal regulation of endogenous AT-RvD1 production. Early treatment with exogenous AT-RvD1 (1 h post infection) enhanced clearance of E. coli and Pseudomonas aeruginosa in vivo, and lung macrophage phagocytosis of fluorescent bacterial particles ex vivo. Characterization of macrophage subsets in the alveolar compartment during pneumonia identified efferocytosis by infiltrating macrophages (CD11b(Hi) CD11c(Low)) and exudative macrophages (CD11b(Hi) CD11c(Hi)). AT-RvD1 increased efferocytosis by these cells ex vivo, and accelerated neutrophil clearance during pneumonia in vivo. These anti-bacterial and pro-resolving actions of AT-RvD1 were additive to antibiotic therapy. Taken together, these findings suggest that the pro-resolving actions of AT-RvD1 during pneumonia represent a novel host-directed therapeutic strategy to complement the current antibiotic-centered approach for combatting infections.
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Affiliation(s)
- Raja Elie E. Abdulnour
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Ho Pan Sham
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - David N. Douda
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Romain A. Colas
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Jesmond Dalli
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Yan Bai
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Xingbin Ai
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Charles N. Serhan
- Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
| | - Bruce D. Levy
- Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA,Center for Experimental Therapeutics and Reperfusion Injury, Department of Anesthesiology, Perioperative and Pain Medicine, Brigham and Women’s Hospital and Harvard Medical School, Boston, MA, 02115, USA
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47
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Uhle F, Chousterman BG, Grützmann R, Brenner T, Weber GF. Pathogenic, immunologic, and clinical aspects of sepsis - update 2016. Expert Rev Anti Infect Ther 2016; 14:917-27. [PMID: 27530423 DOI: 10.1080/14787210.2016.1224971] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
INTRODUCTION Sepsis is a major cause of death worldwide but its orchestrating components remain incompletely understood. On the one hand, development of sepsis results from an infectious focus that cannot be controlled by the immune system, but on the other, responding immune cells that can eliminate the infection inflict damage to the host by contributing to complications such as endothelial leakage, septic shock, and multiorgan failure. AREAS COVERED In this review we give a comprehensive overview of how sepsis occurs, which exogenous and endogenous factors might affect the immune-pathophysiological course of sepsis and finally how this knowledge translates into up-to-date definitions and therapeutic approaches. Expert commentary: Although new immunological mechanisms altering the course of sepsis have been identified recently, future research needs to address the limitations of experimental approaches, redirect the research focus into translational approaches, and finally evaluate personalized treatment strategies.
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Affiliation(s)
- Florian Uhle
- a Department of Anesthesiology , Heidelberg University Hospital , Heidelberg , Germany
| | - Benjamin G Chousterman
- b Department of Anesthesia, Intensive Care and SAMU , Hôpital Lariboisière, AP-HP, and Université Paris Diderot , Paris , France
| | - Robert Grützmann
- c Department of Surgery , University Hospital Erlangen-Nürnberg , Erlangen , Germany
| | - Thorsten Brenner
- a Department of Anesthesiology , Heidelberg University Hospital , Heidelberg , Germany
| | - Georg F Weber
- c Department of Surgery , University Hospital Erlangen-Nürnberg , Erlangen , Germany
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48
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Sands KM, Wilson MJ, Lewis MAO, Wise MP, Palmer N, Hayes AJ, Barnes RA, Williams DW. Respiratory pathogen colonization of dental plaque, the lower airways, and endotracheal tube biofilms during mechanical ventilation. J Crit Care 2016; 37:30-37. [PMID: 27621110 DOI: 10.1016/j.jcrc.2016.07.019] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2016] [Revised: 07/10/2016] [Accepted: 07/24/2016] [Indexed: 12/20/2022]
Abstract
PURPOSE In mechanically ventilated patients, the endotracheal tube is an essential interface between the patient and ventilator, but inadvertently, it also facilitates the development of ventilator-associated pneumonia (VAP) by subverting pulmonary host defenses. A number of investigations suggest that bacteria colonizing the oral cavity may be important in the etiology of VAP. The present study evaluated microbial changes that occurred in dental plaque and lower airways of 107 critically ill mechanically ventilated patients. MATERIALS AND METHODS Dental plaque and lower airways fluid was collected during the course of mechanical ventilation, with additional samples of dental plaque obtained during the entirety of patients' hospital stay. RESULTS A "microbial shift" occurred in dental plaque, with colonization by potential VAP pathogens, namely, Staphylococcus aureus and Pseudomonas aeruginosa in 35 patients. Post-extubation analyses revealed that 70% and 55% of patients whose dental plaque included S aureus and P aeruginosa, respectively, reverted back to having a predominantly normal oral microbiota. Respiratory pathogens were also isolated from the lower airways and within the endotracheal tube biofilms. CONCLUSIONS To the best of our knowledge, this is the largest study to date exploring oral microbial changes during both mechanical ventilation and after recovery from critical illness. Based on these findings, it was apparent that during mechanical ventilation, dental plaque represents a source of potential VAP pathogens.
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Affiliation(s)
- Kirsty M Sands
- Oral and Biomedical Sciences, School of Dentistry, Cardiff University, Cardiff, Wales, UK.
| | - Melanie J Wilson
- Oral and Biomedical Sciences, School of Dentistry, Cardiff University, Cardiff, Wales, UK
| | - Michael A O Lewis
- Oral and Biomedical Sciences, School of Dentistry, Cardiff University, Cardiff, Wales, UK
| | - Matt P Wise
- Adult Critical Care, University Hospital of Wales, Heath Park, Cardiff, Wales, UK
| | - Nicki Palmer
- Adult Critical Care, University Hospital of Wales, Heath Park, Cardiff, Wales, UK
| | - Anthony J Hayes
- Bioimaging Hub, School of Biosciences, Cardiff University, Cardiff, Wales, UK
| | - Rosemary A Barnes
- Cardiff Institute of Infection & Immunity, School of Medicine, Heath Park, Cardiff, Wales, UK
| | - David W Williams
- Oral and Biomedical Sciences, School of Dentistry, Cardiff University, Cardiff, Wales, UK
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Jondle CN, Sharma A, Simonson TJ, Larson B, Mishra BB, Sharma J. Macrophage Galactose-Type Lectin-1 Deficiency Is Associated with Increased Neutrophilia and Hyperinflammation in Gram-Negative Pneumonia. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2016; 196:3088-96. [PMID: 26912318 PMCID: PMC4936400 DOI: 10.4049/jimmunol.1501790] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 01/27/2016] [Indexed: 12/25/2022]
Abstract
C-type lectin receptors (CLRs), the carbohydrate-recognizing molecules, orchestrate host immune response in homeostasis and in inflammation. In the present study we examined the function of macrophage galactose-type lectin-1 (MGL1), a mammalian CLR, in pneumonic sepsis, a deadly immune disorder frequently associated with a nonresolving hyperinflammation. In a murine model of pneumonic sepsis using pulmonary infection with Klebsiella pneumoniae, the expression of MGL1 was upregulated in the lungs of K. pneumoniae-infected mice, and the deficiency of this CLR in MGL1(-/-) mice resulted in significantly increased mortality to infection than in the MGL1-sufficient wild-type mice, despite a similar bacterial burden. The phagocytic cells from MGL1(-/-) mice did not exhibit any defects in bacterial uptake and intracellular killing and were fully competent in neutrophil extracellular trap formation, a recently identified extracellular killing modality of neutrophils. Instead, the increased susceptibility of MGL1(-/-) mice seemed to correlate with severe lung pathology, indicating that MGL1 is required for resolution of pulmonary inflammation. Indeed, the MGL1(-/-) mice exhibited a hyperinflammatory response, massive pulmonary neutrophilia, and an increase in neutrophil-associated immune mediators. Concomitantly, MGL1-deficient neutrophils exhibited an increased influx in pneumonic lungs of K. pneumoniae-infected mice. Taken together, these results show a previously undetermined role of MGL1 in controlling neutrophilia during pneumonic infection, thus playing an important role in resolution of inflammation. To our knowledge, this is the first study depicting a protective function of MGL1 in an acute pneumonic bacterial infection.
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Affiliation(s)
- Christopher N Jondle
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
| | - Atul Sharma
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
| | - Tanner J Simonson
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
| | - Benjamin Larson
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
| | - Bibhuti B Mishra
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
| | - Jyotika Sharma
- Department of Basic Biomedical Sciences, University of North Dakota School of Medicine and Health Sciences, Grand Forks, ND 58202
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Faure E, Bortolotti P, Kipnis E, Faure K, Guery B. Studying Microbial Communities In Vivo: A Model of Host-mediated Interaction Between Candida Albicans and Pseudomonas Aeruginosa in the Airways. J Vis Exp 2016:e53218. [PMID: 26863066 DOI: 10.3791/53218] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Studying host-pathogen interaction enables us to understand the underlying mechanisms of the pathogenicity during microbial infection. The prognosis of the host depends on the involvement of an adapted immune response against the pathogen. Immune response is complex and results from interaction of the pathogens and several immune or non-immune cellular types. In vitro studies cannot characterise these interactions and focus on cell-pathogen interactions. Moreover, in the airway, particularly in patients with suppurative chronic lung disease or in mechanically ventilated patients, polymicrobial communities are present and complicate host-pathogen interaction. Pseudomonas aeruginosa and Candida albicans are both problem pathogens, frequently isolated from tracheobronchial samples, and associated to severe infections, especially in intensive care unit. Microbial interactions have been reported between these pathogens in vitro but the clinical impact of these interactions remains unclear. To study the interactions between C. albicans and P. aeruginosa, a murine model of C. albicans airways colonization, followed by a P. aeruginosa-mediated acute lung infection was performed.
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Affiliation(s)
- Emmanuel Faure
- Recherche translationnelle: relations hôtepathogènes, Université Lille
| | | | - Eric Kipnis
- Recherche translationnelle: relations hôtepathogènes, Université Lille
| | - Karine Faure
- Recherche translationnelle: relations hôtepathogènes, Université Lille
| | - Benoit Guery
- Recherche translationnelle: relations hôtepathogènes, Université Lille;
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