1
|
Koziol-White C, Gebski E, Cao G, Panettieri RA. Precision cut lung slices: an integrated ex vivo model for studying lung physiology, pharmacology, disease pathogenesis and drug discovery. Respir Res 2024; 25:231. [PMID: 38824592 PMCID: PMC11144351 DOI: 10.1186/s12931-024-02855-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2024] [Accepted: 05/18/2024] [Indexed: 06/03/2024] Open
Abstract
Precision Cut Lung Slices (PCLS) have emerged as a sophisticated and physiologically relevant ex vivo model for studying the intricacies of lung diseases, including fibrosis, injury, repair, and host defense mechanisms. This innovative methodology presents a unique opportunity to bridge the gap between traditional in vitro cell cultures and in vivo animal models, offering researchers a more accurate representation of the intricate microenvironment of the lung. PCLS require the precise sectioning of lung tissue to maintain its structural and functional integrity. These thin slices serve as invaluable tools for various research endeavors, particularly in the realm of airway diseases. By providing a controlled microenvironment, precision-cut lung slices empower researchers to dissect and comprehend the multifaceted interactions and responses within lung tissue, thereby advancing our understanding of pulmonary pathophysiology.
Collapse
Affiliation(s)
- Cynthia Koziol-White
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA.
| | - Eric Gebski
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
| | - Gaoyaun Cao
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine and Science, The State University of NJ, 08901, Rutgers, New Brunswick, NJ, USA
| |
Collapse
|
2
|
Song X, Liang J, Lin S, Xie Y, Ke C, Ao D, Lu J, Chen X, He Y, Liu X, Li W. Gut-lung axis and asthma: A historical review on mechanism and future perspective. Clin Transl Allergy 2024; 14:e12356. [PMID: 38687096 PMCID: PMC11060082 DOI: 10.1002/clt2.12356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Revised: 03/24/2024] [Accepted: 04/17/2024] [Indexed: 05/02/2024] Open
Abstract
BACKGROUND Gut microbiota are closely related to the development and regulation of the host immune system by regulating the maturation of immune cells and the resistance to pathogens, which affects the host immunity. Early use of antibiotics disrupts the homeostasis of gut microbiota and increases the risk of asthma. Gut microbiota actively interact with the host immune system via the gut-lung axis, a bidirectional communication pathway between the gut and lung. The manipulation of gut microbiota through probiotics, helminth therapy, and fecal microbiota transplantation (FMT) to combat asthma has become a hot research topic. BODY: This review mainly describes the current immune pathogenesis of asthma, gut microbiota and the role of the gut-lung axis in asthma. Moreover, the potential of manipulating the gut microbiota and its metabolites as a treatment strategy for asthma has been discussed. CONCLUSION The gut-lung axis has a bidirectional effect on asthma. Gut microecology imbalance contributes to asthma through bacterial structural components and metabolites. Asthma, in turn, can also cause intestinal damage through inflammation throughout the body. The manipulation of gut microbiota through probiotics, helminth therapy, and FMT can inform the treatment strategies for asthma by regulating the maturation of immune cells and the resistance to pathogens.
Collapse
Affiliation(s)
- Xiu‐Ling Song
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Juan Liang
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Shao‐Zhu Lin
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Yu‐Wei Xie
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Chuang‐Hong Ke
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Dang Ao
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Jun Lu
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Xue‐Mei Chen
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Ying‐Zhi He
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Xiao‐Hua Liu
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| | - Wen Li
- Department of PediatricsAffiliated Hospital of Guangdong Medical UniversityZhanjiangChina
| |
Collapse
|
3
|
Joshi IV, Chan EC, Lack JB, Liu C, Druey KM. RGS4 controls airway hyperresponsiveness through GAP-independent mechanisms. J Biol Chem 2024; 300:107127. [PMID: 38432633 PMCID: PMC11065749 DOI: 10.1016/j.jbc.2024.107127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2023] [Revised: 02/12/2024] [Accepted: 02/22/2024] [Indexed: 03/05/2024] Open
Abstract
Regulators of G protein signaling (RGS) proteins constrain G protein-coupled receptor (GPCR)-mediated and other responses throughout the body primarily, but not exclusively, through their GTPase-activating protein activity. Asthma is a highly prevalent condition characterized by airway hyper-responsiveness (AHR) to environmental stimuli resulting in part from amplified GPCR-mediated airway smooth muscle contraction. Rgs2 or Rgs5 gene deletion in mice enhances AHR and airway smooth muscle contraction, whereas RGS4 KO mice unexpectedly have decreased AHR because of increased production of the bronchodilator prostaglandin E2 (PGE2) by lung epithelial cells. Here, we found that knockin mice harboring Rgs4 alleles encoding a point mutation (N128A) that sharply curtails RGS4 GTPase-activating protein activity had increased AHR, reduced airway PGE2 levels, and augmented GPCR-induced bronchoconstriction compared with either RGS4 KO mice or WT controls. RGS4 interacted with the p85α subunit of PI3K and inhibited PI3K-dependent PGE2 secretion elicited by transforming growth factor beta in airway epithelial cells. Together, these findings suggest that RGS4 affects asthma severity in part by regulating the airway inflammatory milieu in a G protein-independent manner.
Collapse
Affiliation(s)
- Ilin V Joshi
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Eunice C Chan
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Justin B Lack
- NIAID Collaborative Bioinformatics Resource, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA
| | - Chengyu Liu
- Transgenic Core, NHLBI/NIH, Bethesda, Maryland, USA
| | - Kirk M Druey
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, Maryland, USA.
| |
Collapse
|
4
|
Feng Y, Liu X, Wang Y, Du R, Mao H. Delineating asthma according to inflammation phenotypes with a focus on paucigranulocytic asthma. Chin Med J (Engl) 2023:00029330-990000000-00572. [PMID: 37185590 DOI: 10.1097/cm9.0000000000002456] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2022] [Indexed: 05/17/2023] Open
Abstract
ABSTRACT Asthma is characterized by chronic airway inflammation and airway hyper-responsiveness. However, the differences in pathophysiology and phenotypic symptomology make a diagnosis of "asthma" too broad hindering individualized treatment. Four asthmatic inflammatory phenotypes have been identified based on inflammatory cell profiles in sputum: eosinophilic, neutrophilic, paucigranulocytic, and mixed-granulocytic. Paucigranulocytic asthma may be one of the most common phenotypes in stable asthmatic patients, yet it remains much less studied than the other inflammatory phenotypes. Understanding of paucigranulocytic asthma in terms of phenotypic discrimination, distribution, stability, surrogate biomarkers, underlying pathophysiology, clinical characteristics, and current therapies is fragmented, which impedes clinical management of patients. This review brings together existing knowledge and ongoing research about asthma phenotypes, with a focus on paucigranulocytic asthma, in order to present a comprehensive picture that may clarify specific inflammatory phenotypes and thus improve clinical diagnoses and disease management.
Collapse
Affiliation(s)
- Yinhe Feng
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Xiaoyin Liu
- West China Hospital, West China Medical School, Sichuan University, Chengdu, Sichuan 610041, China
| | - Yubin Wang
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Rao Du
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| | - Hui Mao
- Department of Respiratory and Critical Care Medicine, West China Hospital, Sichuan University, Chengdu, Sichuan 610041, China
| |
Collapse
|
5
|
Wang X, Wang L, Geng L, Tanaka N, Ye B. Resmetirom Ameliorates NASH-Model Mice by Suppressing STAT3 and NF-κB Signaling Pathways in an RGS5-Dependent Manner. Int J Mol Sci 2023; 24:ijms24065843. [PMID: 36982915 PMCID: PMC10058113 DOI: 10.3390/ijms24065843] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 03/06/2023] [Accepted: 03/15/2023] [Indexed: 03/30/2023] Open
Abstract
Resmetirom, a liver-directed, orally active agonist of THR-β, could play a favorable role in treating NASH, but little is known about the underlying mechanism. A NASH cell model was established to test the preventive effect of resmetirom on this disease in vitro. RNA-seq was used for screening, and rescue experiments were performed to validate the target gene of the drug. A NASH mouse model was used to further elucidate the role and the underlying mechanism of resmetirom. Resmetirom effectively eliminated lipid accumulation and decreased triglyceride (TG) levels. In addition, repressed RGS5 in the NASH model could be recovered by resmetirom treatment. The silencing of RGS5 effectively impaired the role of resmetirom. In the NASH mouse model, obvious gray hepatization, liver fibrosis and inflammation, and increased macrophage infiltration were observed in liver tissues, while resmetirom almost returned them to normal conditions as observed in the control group. Pathological experimental data also confirmed that resmetirom has great potential in NASH treatment. Finally, RGS5 expression was suppressed in the NASH mouse model, but it was upregulated by resmetirom treatment, while the STAT3 and NF-κB signaling pathways were activated in NASH but inhibited by the agent. Resmetirom could improve NASH by recovering RGS5 expression and subsequently inactivating the STAT3 and NF-κB signaling pathways.
Collapse
Affiliation(s)
- Xiaojing Wang
- Department of Gastroenterology, Lishui Hospital of Zhejiang University/The Central Hospital of Lishui, Lishui 323000, China
| | - Liangjing Wang
- Department of Gastroenterology, The Second Affiliated Hospital, School of Medicine, Zhejiang University, Hangzhou 310009, China
- Institute of Gastroenterology, Zhejiang University, Hangzhou 310009, China
| | - Lin Geng
- Department of Gastroenterology, Lishui Hospital of Zhejiang University/The Central Hospital of Lishui, Lishui 323000, China
| | - Naoki Tanaka
- Department of Global Medical Research Promotion, Shinshu University Graduate School of Medicine, Matsumoto 390-8621, Japan
- International Relations Office, Shinshu University School of Medicine, Matsumoto 390-8621, Japan
- Research Center for Social Systems, Shinshu University, Matsumoto 390-8621, Japan
| | - Bin Ye
- Department of Gastroenterology, Lishui Hospital of Zhejiang University/The Central Hospital of Lishui, Lishui 323000, China
| |
Collapse
|
6
|
Akkenepally S, Yombo DJK, Yerubandi S, Geereddy BR, McCormack FX, Madala SK. Interleukin 31 receptor alpha augments muscarinic acetylcholine receptor 3-driven calcium signaling and airway hyperresponsiveness in asthma. RESEARCH SQUARE 2023:rs.3.rs-2564484. [PMID: 36824812 PMCID: PMC9949265 DOI: 10.21203/rs.3.rs-2564484/v1] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Asthma is a chronic inflammatory airway disease characterized by airway hyperresponsiveness (AHR), inflammation, and goblet cell hyperplasia. Both Th1 and Th2 cytokines, including IFN-γ, IL-4, and IL-13 have been shown to induce asthma; however, the underlying mechanisms remain unclear. We observed a significant increase in the expression of IL-31RA, but not its cognate ligand IL-31 during allergic asthma. In support of this, IFN-γ and Th2 cytokines, IL-4 and IL-13, upregulated IL-31RA but not IL-31 in airway smooth muscle cells (ASMC). Importantly, the loss of IL-31RA attenuated AHR but had no effects on inflammation and goblet cell hyperplasia in allergic asthma or mice treated with IL-13 or IFN-γ. Mechanistically, we demonstrate that IL-31RA functions as a positive regulator of muscarinic acetylcholine receptor 3 expression and calcium signaling in ASMC. Together, these results identified a novel role for IL-31RA in AHR distinct from airway inflammation and goblet cell hyperplasia in asthma.
Collapse
Affiliation(s)
- Santoshi Akkenepally
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
- Division of Biochemistry, National Institute of Nutrition, Hyderabad, Telangana, India
| | - Dan JK Yombo
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio USA
| | - Sanjana Yerubandi
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio USA
| | | | - Francis X. McCormack
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
| | - Satish K Madala
- Division of Pulmonary, Critical Care and Sleep Medicine, Department of Internal Medicine, University of Cincinnati, Cincinnati, Ohio USA
- Division of Pulmonary Medicine, Department of Pediatrics, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio USA
| |
Collapse
|
7
|
Targeting the Semaphorin3E-plexinD1 complex in allergic asthma. Pharmacol Ther 2023; 242:108351. [PMID: 36706796 DOI: 10.1016/j.pharmthera.2023.108351] [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: 03/31/2022] [Revised: 01/09/2023] [Accepted: 01/19/2023] [Indexed: 01/26/2023]
Abstract
Asthma is a heterogenous airway disease characterized by airway inflammation and remodeling. It affects more than 300 million people worldwide and poses a significant burden on society. Semaphorins, discovered initially as neural guidance molecules, are ubiquitously expressed in various organs and regulate multiple signaling pathways. Interestingly, Semaphorin3E is a critical molecule in lung pathophysiology through its role in both lung development and homeostasis. Semaphorin3E binds to plexinD1, mediating regulatory effects on cell migration, proliferation, and angiogenesis. Recent in vitro and in vivo studies have demonstrated that the Semaphorin3E-plexinD1 axis is implicated in asthma, impacting inflammatory and structural cells associated with airway inflammation, tissue remodeling, and airway hyperresponsiveness. This review details the Semaphorin3E-plexinD1 axis in various aspects of asthma and highlights future directions in research including its potential role as a therapeutic target in airway allergic diseases.
Collapse
|
8
|
Shah SD, Nayak AP, Sharma P, Villalba DR, Addya S, Huang W, Shapiro P, Kane MA, Deshpande DA. Targeted Inhibition of Select Extracellular Signal-regulated Kinases 1 and 2 Functions Mitigates Pathological Features of Asthma in Mice. Am J Respir Cell Mol Biol 2023; 68:23-38. [PMID: 36067041 PMCID: PMC9817918 DOI: 10.1165/rcmb.2022-0110oc] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2022] [Accepted: 08/26/2022] [Indexed: 02/05/2023] Open
Abstract
ERK1/2 (extracellular signal-regulated kinases 1 and 2) regulate the activity of various transcription factors that contribute to asthma pathogenesis. Although an attractive drug target, broadly inhibiting ERK1/2 is challenging because of unwanted cellular toxicities. We have identified small molecule inhibitors with a benzenesulfonate scaffold that selectively inhibit ERK1/2-mediated activation of AP-1 (activator protein-1). Herein, we describe the findings of targeting ERK1/2-mediated substrate-specific signaling with the small molecule inhibitor SF-3-030 in a murine model of house dust mite (HDM)-induced asthma. In 8- to 10-week-old BALB/c mice, allergic asthma was established by repeated intranasal HDM (25 μg/mouse) instillation for 3 weeks (5 days/week). A subgroup of mice was prophylactically dosed with 10 mg/kg SF-3-030/DMSO intranasally 30 minutes before the HDM challenge. Following the dosing schedule, mice were evaluated for alterations in airway mechanics, inflammation, and markers of airway remodeling. SF-3-030 treatment significantly attenuated HDM-induced elevation of distinct inflammatory cell types and cytokine concentrations in BAL and IgE concentrations in the lungs. Histopathological analysis of lung tissue sections revealed diminished HDM-induced pleocellular peribronchial inflammation, mucus cell metaplasia, collagen accumulation, thickening of airway smooth muscle mass, and expression of markers of cell proliferation (Ki-67 and cyclin D1) in mice treated with SF-3-030. Furthermore, SF-3-030 treatment attenuated HDM-induced airway hyperresponsiveness in mice. Finally, mechanistic studies using transcriptome and proteome analyses suggest inhibition of HDM-induced genes involved in inflammation, cell proliferation, and tissue remodeling by SF-3-030. These preclinical findings demonstrate that function-selective inhibition of ERK1/2 signaling mitigates multiple features of asthma in a murine model.
Collapse
Affiliation(s)
- Sushrut D. Shah
- Center for Translational Medicine, Jane and Leonard Korman Lung Center, and
| | - Ajay P. Nayak
- Center for Translational Medicine, Jane and Leonard Korman Lung Center, and
| | - Pawan Sharma
- Center for Translational Medicine, Jane and Leonard Korman Lung Center, and
| | | | - Sankar Addya
- Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, Pennsylvania; and
| | - Weiliang Huang
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Baltimore, Maryland
| | - Paul Shapiro
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Baltimore, Maryland
| | - Maureen A. Kane
- Department of Pharmaceutical Sciences, School of Pharmacy, University of Maryland, Baltimore, Baltimore, Maryland
| | | |
Collapse
|
9
|
Paucigranulocytic Asthma: Potential Pathogenetic Mechanisms, Clinical Features and Therapeutic Management. J Pers Med 2022; 12:jpm12050850. [PMID: 35629272 PMCID: PMC9145917 DOI: 10.3390/jpm12050850] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2022] [Revised: 05/10/2022] [Accepted: 05/20/2022] [Indexed: 12/13/2022] Open
Abstract
Asthma is a heterogeneous disease usually characterized by chronic airway inflammation, in which several phenotypes have been described, related to the age of onset, symptoms, inflammatory characteristics and treatment response. The identification of the inflammatory phenotype in asthma is very useful, since it allows for both the recognition of the asthmatic triggering factor as well as the optimization of treatment The paucigranulocytic phenotype of asthma (PGA) is characterized by sputum eosinophil levels <1−3% and sputum neutrophil levels < 60%. The precise characteristics and the pathobiology of PGA are not fully understood, and, in some cases, it seems to represent a previous eosinophilic phenotype with a good response to anti-inflammatory treatment. However, many patients with PGA remain uncontrolled and experience asthmatic symptoms and exacerbations, irrespective of the low grade of airway inflammation. This observation leads to the hypothesis that PGA might also be either a special phenotype driven by different kinds of cells, such as macrophages or mast cells, or a non-inflammatory phenotype with a low grade of eosinophilic inflammation. In this review, we aim to describe the special characteristics of PGA and the potential therapeutic interventions that could be offered to these patients.
Collapse
|
10
|
Berman R, Rose CS, Downey GP, Day BJ, Chu HW. Role of Particulate Matter from Afghanistan and Iraq in Deployment-Related Lung Disease. Chem Res Toxicol 2021; 34:2408-2423. [PMID: 34808040 DOI: 10.1021/acs.chemrestox.1c00090] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Approximately 3 million United States military personnel and contractors were deployed to Southwest Asia and Afghanistan over the past two decades. After returning to the United States, many developed persistent respiratory symptoms, including those due to asthma, rhinosinusitis, bronchiolitis, and others, which we collectively refer to as deployment-related lung diseases (DRLD). The mechanisms of different DRLD have not been well defined. Limited studies from us and others suggest that multiple factors and biological signaling pathways contribute to the onset of DRLD. These include, but are not limited to, exposures to high levels of particulate matter (PM) from sandstorms, burn pit combustion products, improvised explosive devices, and diesel exhaust particles. Once inhaled, these hazardous substances can activate lung immune and structural cells to initiate numerous cell-signaling pathways such as oxidative stress, Toll-like receptors, and cytokine-driven cell injury (e.g., interleukin-33). These biological events may lead to a pro-inflammatory response and airway hyperresponsiveness. Additionally, exposures to PM and other environmental hazards may predispose military personnel and contractors to more severe disease due to the interactions of those hazardous materials with subsequent exposures to allergens and cigarette smoke. Understanding how airborne exposures during deployment contribute to DRLD may identify effective targets to alleviate respiratory diseases and improve quality of life in veterans and active duty military personnel.
Collapse
Affiliation(s)
- Reena Berman
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, Colorado 80206, United States
| | - Cecile S Rose
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, Colorado 80206, United States
| | - Gregory P Downey
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, Colorado 80206, United States
| | - Brian J Day
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, Colorado 80206, United States
| | - Hong Wei Chu
- Department of Medicine, National Jewish Health, 1400 Jackson Street, Denver, Colorado 80206, United States
| |
Collapse
|
11
|
Sharma N, Nagaraj C, Nagy BM, Marsh LM, Bordag N, Zabini D, Wygrecka M, Klepetko W, Gschwandtner E, Genové G, Heinemann A, Weir EK, Kwapiszewska G, Olschewski H, Olschewski A. RGS5 Determines Neutrophil Migration in the Acute Inflammatory Phase of Bleomycin-Induced Lung Injury. Int J Mol Sci 2021; 22:ijms22179342. [PMID: 34502263 PMCID: PMC8430858 DOI: 10.3390/ijms22179342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2021] [Revised: 08/22/2021] [Accepted: 08/24/2021] [Indexed: 11/16/2022] Open
Abstract
The regulator of G protein signaling (RGS) represents a widespread system of controllers of cellular responses. The activities of the R4 subfamily of RGSs have been elucidated in allergic pulmonary diseases. However, the R4 signaling in other inflammatory lung diseases, with a strong cellular immune response, remained unexplored. Thus, our study aimed to discern the functional relevance of the R4 family member, RGS5, as a potential modulating element in this context. Gene profiling of the R4 subfamily showed increased RGS5 expression in human fibrosing lung disease samples. In line with this, RGS5 was markedly increased in murine lungs following bleomycin injury. RGS knock-out mice (RGS-/-) had preserved lung function while control mice showed significant combined ventilatory disorders three days after bleomycin application as compared to untreated control mice. Loss of RGS5 was associated with a significantly reduced neutrophil influx and tissue myeloperoxidase expression. In the LPS lung injury model, RGS5-/- mice also failed to recruit neutrophils into the lung, which was accompanied by reduced tissue myeloperoxidase levels after 24 h. Our in-vitro assays showed impaired migration of RGS5-/- neutrophils towards chemokines despite preserved Ca2+ signaling. ERK dephosphorylation might play a role in reduced neutrophil migration in our model. As a conclusion, loss of RGS5 preserves lung function and attenuates hyperinflammation in the acute phase of bleomycin-induced pulmonary fibrosis and LPS-induced lung injury. Targeting RGS5 might alleviate the severity of exacerbations in interstitial lung diseases.
Collapse
Affiliation(s)
- Neha Sharma
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Experimental Anaesthesiology, Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, 8036 Graz, Austria
| | - Chandran Nagaraj
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
| | - Bence M. Nagy
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
| | - Leigh M. Marsh
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
| | - Natalie Bordag
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Department of Dermatology and Venereology, Medical University of Graz, 8036 Graz, Austria
| | - Diana Zabini
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Otto Loewi Research Center, Medical University of Graz, 8010 Graz, Austria
| | - Malgorzata Wygrecka
- Department of Biochemistry, Universities of Giessen and Marburg Lung Center, Justus Liebig University of Giessen, Friedrichstrasse 24, 35392 Giessen, Germany;
| | - Walter Klepetko
- Department of Thoracic Surgery, Medical University of Vienna, 1090 Vienna, Austria; (W.K.); (E.G.)
| | - Elisabeth Gschwandtner
- Department of Thoracic Surgery, Medical University of Vienna, 1090 Vienna, Austria; (W.K.); (E.G.)
| | - Guillem Genové
- Integrated CardioMetabolic Centre (ICMC), Department of Medicine, Karolinska Institute, 171 77 Huddinge, Sweden;
| | - Akos Heinemann
- Otto Loewi Research Center for Vascular Biology, Immunology and Inflammation, Division of Pharmacology, Medical University of Graz, 8010 Graz, Austria;
| | - E Kenneth Weir
- Department of Medicine, University of Minnesota, Minneapolis, MN 55455, USA;
| | - Grazyna Kwapiszewska
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Otto Loewi Research Center, Medical University of Graz, 8010 Graz, Austria
| | - Horst Olschewski
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Department of Internal Medicine, Division of Pulmonology, Medical University of Graz, 8036 Graz, Austria
| | - Andrea Olschewski
- Ludwig Boltzmann Institute for Lung Vascular Research, 8010 Graz, Austria; (N.S.); (C.N.); (B.M.N.); (L.M.M.); (N.B.); (D.Z.); (G.K.); (H.O.)
- Experimental Anaesthesiology, Department of Anaesthesiology and Intensive Care Medicine, Medical University of Graz, 8036 Graz, Austria
- Correspondence: ; Tel.: +43-(0)316-385-72057
| |
Collapse
|
12
|
Yan SLS, Hwang IY, Kamenyeva O, Kabat J, Kim JS, Park C, Kehrl JH. Unrestrained Gα i2 Signaling Disrupts Neutrophil Trafficking, Aging, and Clearance. Front Immunol 2021; 12:679856. [PMID: 34135907 PMCID: PMC8202015 DOI: 10.3389/fimmu.2021.679856] [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: 03/12/2021] [Accepted: 05/11/2021] [Indexed: 01/13/2023] Open
Abstract
Neutrophil trafficking, homeostatic and pathogen elicited, depends upon chemoattractant receptors triggering heterotrimeric G-protein Gαiβγ signaling, whose magnitude and kinetics are governed by RGS protein/Gαi interactions. RGS proteins typically limit Gαi signaling by reducing the duration that Gαi subunits remain GTP bound and able to activate downstream effectors. Yet how in totality RGS proteins shape neutrophil chemoattractant receptor activated responses remains unclear. Here, we show that C57Bl/6 mouse neutrophils containing a genomic knock-in of a mutation that disables all RGS protein-Gαi2 interactions (G184S) cannot properly balance chemoattractant receptor signaling, nor appropriately respond to inflammatory insults. Mutant neutrophils accumulate in mouse bone marrow, spleen, lung, and liver; despite neutropenia and an intrinsic inability to properly mobilize from the bone marrow. In vitro they rapidly adhere to ICAM-1 coated plates, but in vivo they poorly adhere to blood vessel endothelium. Those few neutrophils that cross blood vessels and enter tissues migrate haphazardly. Following Concanavalin-A administration fragmented G184S neutrophils accumulate in liver sinusoids leading to thrombo-inflammation and perivasculitis. Thus, neutrophil Gαi2/RGS protein interactions both limit and facilitate Gαi2 signaling thereby promoting normal neutrophil trafficking, aging, and clearance.
Collapse
Affiliation(s)
- Serena Li-Sue Yan
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Il-Young Hwang
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Olena Kamenyeva
- Biological Imaging, Research Technology Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Juraj Kabat
- Biological Imaging, Research Technology Branch, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Ji Sung Kim
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - Chung Park
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| | - John H Kehrl
- Laboratory of Immunoregulation, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD, United States
| |
Collapse
|
13
|
Fuentes N, McCullough M, Panettieri RA, Druey KM. RGS proteins, GRKs, and beta-arrestins modulate G protein-mediated signaling pathways in asthma. Pharmacol Ther 2021; 223:107818. [PMID: 33600853 DOI: 10.1016/j.pharmthera.2021.107818] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/25/2021] [Indexed: 12/17/2022]
Abstract
Asthma is a highly prevalent disorder characterized by chronic lung inflammation and reversible airways obstruction. Pathophysiological features of asthma include episodic and reversible airway narrowing due to increased bronchial smooth muscle shortening in response to external and host-derived mediators, excessive mucus secretion into the airway lumen, and airway remodeling. The aberrant airway smooth muscle (ASM) phenotype observed in asthma manifests as increased sensitivity to contractile mediators (EC50) and an increase in the magnitude of contraction (Emax); collectively these attributes have been termed "airways hyper-responsiveness" (AHR). This defining feature of asthma can be promoted by environmental factors including airborne allergens, viruses, and air pollution and other irritants. AHR reduces airway caliber and obstructs airflow, evoking clinical symptoms such as cough, wheezing and shortness of breath. G-protein-coupled receptors (GPCRs) have a central function in asthma through their impact on ASM and airway inflammation. Many but not all treatments for asthma target GPCRs mediating ASM contraction or relaxation. Here we discuss the roles of specific GPCRs, G proteins, and their associated signaling pathways, in asthma, with an emphasis on endogenous mechanisms of GPCR regulation of ASM tone and lung inflammation including regulators of G-protein signaling (RGS) proteins, G-protein coupled receptor kinases (GRKs), and β-arrestin.
Collapse
Affiliation(s)
- Nathalie Fuentes
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, NIAID/NIH, Bethesda, MD, United States of America
| | - Morgan McCullough
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, NIAID/NIH, Bethesda, MD, United States of America
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ, United States of America
| | - Kirk M Druey
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, NIAID/NIH, Bethesda, MD, United States of America.
| |
Collapse
|
14
|
Mechanisms of non-type 2 asthma. Curr Opin Immunol 2020; 66:123-128. [PMID: 33160187 DOI: 10.1016/j.coi.2020.10.002] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Accepted: 10/04/2020] [Indexed: 12/17/2022]
Abstract
Non-type 2 inflammation (Non-T2)-mediated asthma is difficult to define due to lack of signature biomarkers. It exists in the absence of T2-high or eosinophilic inflammation and includes neutrophilic and paucigranulocytic subtypes. Several cell types and cytokines, including Th1, Th17, IL-6, and IL-17, contribute to mechanisms of non-T2 asthma. Neutrophil extracellular traps (NETs) and inflammasome activation likely play a role in severe neutrophilic asthma. Several mechanisms lead to uncoupling of airway hyperresponsiveness and remodeling from airway inflammation in paucigranulocytic asthma. Recent research on transcriptomics and proteomics in non-T2 asthma is discussed in this review. Investigations of specific drug therapies for non-T2 asthma have been disappointing, and remain an important area for future clinical studies.
Collapse
|
15
|
An Integrative miRNA-mRNA Expression Analysis Reveals Striking Transcriptomic Similarities between Severe Equine Asthma and Specific Asthma Endotypes in Humans. Genes (Basel) 2020; 11:genes11101143. [PMID: 32998415 PMCID: PMC7600650 DOI: 10.3390/genes11101143] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 09/21/2020] [Accepted: 09/24/2020] [Indexed: 11/23/2022] Open
Abstract
Severe equine asthma is an incurable obstructive respiratory condition affecting 10–15% of horses in temperate climates. Upon exposure to airborne antigens from hay feeding, affected horses show neutrophilic airway inflammation and bronchoconstriction, leading to increased respiratory effort. The resulting implications range from welfare concerns to economic impacts on equestrian sports and horse breeding. Immunological and pathophysiological characteristics of severe equine asthma show important parallels with allergic and severe neutrophilic human asthma. Our study aimed at investigating regulatory networks underlying the pathophysiology of the disease by profiling miRNA and mRNA expression in lung tissue samples from asthmatic horses compared with healthy controls. We sequenced small RNAs and mRNAs from lungs of seven asthmatic horses in exacerbation, five affected horses in remission, and eight healthy control horses. Our comprehensive differential expression analyses, combined with the miRNA–mRNA negative correlation approach, revealed a strong similarity on the transcriptomic level between severe equine asthma and severe neutrophilic asthma in humans, potentially through affecting Th17 cell differentiation. This study also showed that several dysregulated miRNAs and mRNAs are involved in airway remodeling. These results present a starting point for a better transcriptomic understanding of severe equine asthma and its similarities to asthma in humans.
Collapse
|
16
|
Wong GS, Redes JL, Balenga N, McCullough M, Fuentes N, Gokhale A, Koziol-White C, Jude JA, Madigan LA, Chan EC, Jester WH, Biardel S, Flamand N, Panettieri RA, Druey KM. RGS4 promotes allergen- and aspirin-associated airway hyperresponsiveness by inhibiting PGE2 biosynthesis. J Allergy Clin Immunol 2020; 146:1152-1164.e13. [PMID: 32199913 DOI: 10.1016/j.jaci.2020.03.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 02/21/2020] [Accepted: 03/11/2020] [Indexed: 12/12/2022]
Abstract
BACKGROUND Allergens elicit host production of mediators acting on G-protein-coupled receptors to regulate airway tone. Among these is prostaglandin E2 (PGE2), which, in addition to its role as a bronchodilator, has anti-inflammatory actions. Some patients with asthma develop bronchospasm after the ingestion of aspirin and other nonsteroidal anti-inflammatory drugs, a disorder termed aspirin-exacerbated respiratory disease. This condition may result in part from abnormal dependence on the bronchoprotective actions of PGE2. OBJECTIVE We sought to understand the functions of regulator of G protein signaling 4 (RGS4), a cytoplasmic protein expressed in airway smooth muscle and bronchial epithelium that regulates the activity of G-protein-coupled receptors, in asthma. METHODS We examined RGS4 expression in human lung biopsies by immunohistochemistry. We assessed airways hyperresponsiveness (AHR) and lung inflammation in germline and airway smooth muscle-specific Rgs4-/- mice and in mice treated with an RGS4 antagonist after challenge with Aspergillus fumigatus. We examined the role of RGS4 in nonsteroidal anti-inflammatory drug-associated bronchoconstriction by challenging aspirin-exacerbated respiratory disease-like (ptges1-/-) mice with aspirin. RESULTS RGS4 expression in respiratory epithelium is increased in subjects with severe asthma. Allergen-induced AHR was unexpectedly diminished in Rgs4-/- mice, a finding associated with increased airway PGE2 levels. RGS4 modulated allergen-induced PGE2 secretion in human bronchial epithelial cells and prostanoid-dependent bronchodilation. The RGS4 antagonist CCG203769 attenuated AHR induced by allergen or aspirin challenge of wild-type or ptges1-/- mice, respectively, in association with increased airway PGE2 levels. CONCLUSIONS RGS4 may contribute to the development of AHR by reducing airway PGE2 biosynthesis in allergen- and aspirin-induced asthma.
Collapse
Affiliation(s)
- Gordon S Wong
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Jamie L Redes
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Nariman Balenga
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Morgan McCullough
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Nathalie Fuentes
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Ameya Gokhale
- Food Allergy Research Unit, Laboratory of Allergic Diseases, NIAID/NIH, Bethesda, Md
| | - Cynthia Koziol-White
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ
| | - Joseph A Jude
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ
| | - Laura A Madigan
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - Eunice C Chan
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md
| | - William H Jester
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ
| | - Sabrina Biardel
- Centre de recherche de l'IUCPQ, Département de médecine, Faculté de médecine, Université Laval, Québec, Canada
| | - Nicolas Flamand
- Centre de recherche de l'IUCPQ, Département de médecine, Faculté de médecine, Université Laval, Québec, Canada
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers University School of Medicine, New Brunswick, NJ
| | - Kirk M Druey
- Lung and Vascular Inflammation Section, Laboratory of Allergic Diseases, National Institute of Allergy and Infectious Diseases (NIAID)/National Institutes of Health (NIH), Bethesda, Md.
| |
Collapse
|
17
|
George T, Chakraborty M, Giembycz MA, Newton R. A bronchoprotective role for Rgs2 in a murine model of lipopolysaccharide-induced airways inflammation. Allergy Asthma Clin Immunol 2018; 14:40. [PMID: 30305828 PMCID: PMC6166284 DOI: 10.1186/s13223-018-0266-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2018] [Accepted: 05/22/2018] [Indexed: 02/07/2023] Open
Abstract
Background Asthma exacerbations are associated with the recruitment of neutrophils to the lungs. These cells release proteases and mediators, many of which act at G protein-coupled receptors (GPCRs) that couple via Gq to promote bronchoconstriction and inflammation. Common asthma therapeutics up-regulate expression of the regulator of G protein signalling (RGS), RGS2. As RGS2 reduces signaling from Gq-coupled GPCRs, we have defined role(s) for this GTPase-activating protein in an acute neutrophilic model of lung inflammation. Methods Wild type and Rgs2−/− C57Bl6 mice were exposed to nebulized lipopolysaccharide (LPS). Lung function (respiratory system resistance and compliance) was measured using a SCIREQ flexivent small animal ventilator. Lung inflammation was assessed by histochemistry, cell counting and by cytokine and chemokine expression in bronchoalveolar lavage (BAL) fluid. Results Lipopolysaccharide inhalation induced transient airways hyperreactivity (AHR) and neutrophilic lung inflammation. While AHR and inflammation was greatest 3 h post-LPS exposure, BAL neutrophils persisted for 24 h. At 3 h post-LPS inhalation, multiple inflammatory cytokines (CSF2, CSF3, IL6, TNF) and chemokines (CCL3, CCL4, CXCL1, CXCL2) were highly expressed in the BAL fluid, prior to declining by 24 h. Compared to wild type counterparts, Rgs2−/− mice developed significantly greater airflow resistance in response to inhaled methacholine (MCh) at 3 h post-LPS exposure. At 24 h post-LPS exposure, when lung function was recovering in the wild type animals, MCh-induced resistance was increased, and compliance decreased, in Rgs2−/− mice. Thus, Rgs2−/− mice show AHR and stiffer lungs 24 h post-LPS exposure. Histological markers of inflammation, total and differential cell counts, and major cytokine and chemokine expression in BAL fluid were similar between wild type and Rgs2−/− mice. However, 3 and 24 h post-LPS exposure, IL12B expression was significantly elevated in BAL fluid from Rgs2−/− mice compared to wild type animals. Conclusions While Rgs2 is bronchoprotective in acute neutrophilic inflammation, no clear anti-inflammatory effect was apparent. Nevertheless, elevated IL12B expression in Rgs2−/− animals raises the possibility that RGS2 could dampen Th1 responses. These findings indicate that up-regulation of RGS2, as occurs in response to inhaled corticosteroids and long-acting β2-adrenoceptor agonists, may be beneficial in acute neutrophilic exacerbations of airway disease, including asthma. Electronic supplementary material The online version of this article (10.1186/s13223-018-0266-5) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Tresa George
- 1Airways Inflammation Research Group, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6 Canada
| | - Mainak Chakraborty
- 2Immunology Research Group, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6 Canada
| | - Mark A Giembycz
- 1Airways Inflammation Research Group, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6 Canada
| | - Robert Newton
- 1Airways Inflammation Research Group, Snyder Institute for Chronic Diseases, University of Calgary, Calgary, AB T2N 4Z6 Canada
| |
Collapse
|
18
|
Chan EC, Ren C, Xie Z, Jude J, Barker T, Koziol-White CA, Ma M, Panettieri RA, Wu D, Rosenberg HF, Druey KM. Regulator of G protein signaling 5 restricts neutrophil chemotaxis and trafficking. J Biol Chem 2018; 293:12690-12702. [PMID: 29929985 DOI: 10.1074/jbc.ra118.002404] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 06/14/2018] [Indexed: 01/09/2023] Open
Abstract
Neutrophils are white blood cells that are mobilized to damaged tissues and to sites of pathogen invasion, providing the first line of host defense. Chemokines displayed on the surface of blood vessels promote migration of neutrophils to these sites, and tissue- and pathogen-derived chemoattractant signals, including N-formylmethionylleucylphenylalanine (fMLP), elicit further migration to sites of infection. Although nearly all chemoattractant receptors use heterotrimeric G proteins to transmit signals, many of the mechanisms lying downstream of chemoattractant receptors that either promote or limit neutrophil motility are incompletely defined. Here, we show that regulator of G protein signaling 5 (RGS5), a protein that modulates G protein activity, is expressed in both human and murine neutrophils. We detected significantly more neutrophils in the airways of Rgs5-/- mice than WT counterparts following acute respiratory virus infection and in the peritoneum in response to injection of thioglycollate, a biochemical proinflammatory stimulus. RGS5-deficient neutrophils responded with increased chemotaxis elicited by the chemokines CXC motif chemokine ligand 1 (CXCL1), CXCL2, and CXCL12 but not fMLP. Moreover, adhesion of these cells was increased in the presence of both CXCL2 and fMLP. In summary, our results indicate that RGS5 deficiency increases chemotaxis and adhesion, leading to more efficient neutrophil mobilization to inflamed tissues in mice. These findings suggest that RGS5 expression and activity in neutrophils determine their migrational patterns in the complex microenvironments characteristic of inflamed tissues.
Collapse
Affiliation(s)
- Eunice C Chan
- Molecular Signal Transduction Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892
| | - Chunguang Ren
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut 06510
| | - Zhihui Xie
- Molecular Signal Transduction Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892
| | - Joseph Jude
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers New Jersey School of Medicine, Rutgers, New Jersey 07103
| | - Tolga Barker
- Molecular Signal Transduction Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892
| | - Cynthia A Koziol-White
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers New Jersey School of Medicine, Rutgers, New Jersey 07103
| | - Michelle Ma
- Inflammation Immunobiology Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine and Science, Child Health Institute of New Jersey, Rutgers New Jersey School of Medicine, Rutgers, New Jersey 07103
| | - Dianqing Wu
- Department of Pharmacology, Yale University School of Medicine, New Haven, Connecticut 06510
| | - Helene F Rosenberg
- Inflammation Immunobiology Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892
| | - Kirk M Druey
- Molecular Signal Transduction Section, NIAID, National Institutes of Health, Bethesda, Maryland 20892.
| |
Collapse
|
19
|
Tliba O, Panettieri RA. Paucigranulocytic asthma: Uncoupling of airway obstruction from inflammation. J Allergy Clin Immunol 2018; 143:1287-1294. [PMID: 29928921 DOI: 10.1016/j.jaci.2018.06.008] [Citation(s) in RCA: 94] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2018] [Revised: 05/17/2018] [Accepted: 06/01/2018] [Indexed: 01/01/2023]
Abstract
Among patients with asthma, heterogeneity exists regarding the pattern of airway inflammation and response to treatment, prompting the necessity of recognizing specific phenotypes. Based on the analysis of inflammatory cell counts in induced sputum, asthmatic patients can be classified into 4 unique phenotypes: eosinophilic asthma, neutrophilic asthma, mixed granulocytic asthma, and paucigranulocytic asthma (PGA). PGA is an asthma phenotype with no evidence of increased numbers of eosinophils or neutrophils in sputum or blood and in which anti-inflammatory therapies are ineffective at controlling symptoms. Although underinvestigated, PGA is the most common asthma phenotype in patients with stable asthma. However, PGA is sometimes underestimated because of the exclusive reliance on induced sputum cell counts, which are variable among cohorts of studies, prompting the necessity of developing improved biomarkers. Importantly, investigators have reported that inhaled corticosteroids had a limited effect on airway inflammatory markers in patients with PGA and therefore defining PGA as a potentially "steroid-insensitive" phenotype that requires exploration of alternative therapies. PGA manifests as an uncoupling of airway obstruction from airway inflammation that can be driven by structural changes within the airways, such as airway smooth muscle tissue hypertrophy. Animal models provide evidence that processes evoking airway hyperresponsiveness and airway smooth muscle thickening occur independent from inflammation and might be a consequence of a loss of negative homeostatic processes. Collectively, further understanding of PGA with a focus on the characterization, prevalence, clinical significance, and pathobiology derived from animal studies will likely provide precision therapies that will improve PGA clinical outcomes.
Collapse
Affiliation(s)
- Omar Tliba
- Rutgers Institute for Translational Medicine & Science, Robert Wood Johnson School of Medicine, Rutgers, State University of New Jersey, New Brunswick, NJ
| | - Reynold A Panettieri
- Rutgers Institute for Translational Medicine & Science, Robert Wood Johnson School of Medicine, Rutgers, State University of New Jersey, New Brunswick, NJ.
| |
Collapse
|
20
|
Newton R. Regulators of G-Protein Signaling as Asthma Therapy? Am J Respir Cell Mol Biol 2018; 58:7-9. [PMID: 29286861 DOI: 10.1165/rcmb.2017-0333ed] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Affiliation(s)
- Robert Newton
- 1 Cumming School of Medicine University of Calgary Calgary, Alberta, Canada
| |
Collapse
|
21
|
Movassagh H, Shan L, Duke-Cohan JS, Chakir J, Halayko AJ, Koussih L, Gounni AS. Downregulation of semaphorin 3E promotes hallmarks of experimental chronic allergic asthma. Oncotarget 2017; 8:98953-98963. [PMID: 29228740 PMCID: PMC5716780 DOI: 10.18632/oncotarget.22144] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 08/26/2017] [Indexed: 12/31/2022] Open
Abstract
Guidance cues such as semaphorins are attractive novel therapeutic targets for allergic disorders. We have previously described an inhibitory effect of semaphorin 3E (Sema3E) on human airway smooth muscle cell function. We have further addressed a canonical role for Sema3E in acute model of allergic asthma in vivo. Considering the chronic nature of the disease, the potential implication of Sema3E to alleviate long-lasting deficits should be investigated. Expression of Sema3E in a chronic model of allergic asthma was assessed after exposure to house dust mite (HDM) as a clinically relevant allergen. Chronic features of allergic asthma including airway hyper-responsiveness (AHR), inflammation, and remodeling were studied in Sema3E-deficient mice. Additionally, the effect of exogenous Sema3E treatment was evaluated in prophylactic and therapeutic experimental models. We have demonstrated that expression of Sema3E is robustly suppressed in the airways upon chronic HDM exposure. Chronic allergic airway disease was significantly augmented in Sema3E-deficient mouse model which was associated with an increased AHR, remodeling, and Th2/Th17 inflammation. Intranasal Sema3E administration restored chronic deficits of allergic asthma in mice. Data from this study unveil a key regulatory role of Sema3E in chronic course of asthma via orchestration of impaired inflammatory and remodeling responses.
Collapse
Affiliation(s)
- Hesam Movassagh
- Department of Immunology, Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Lianyu Shan
- Department of Immunology, Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Jonathan S Duke-Cohan
- Department of Medical Oncology, Dana-Farber Cancer Institute, Harvard Institutes of Medicine, Boston, MA, USA
| | - Jamila Chakir
- Centre de recherche de l'Institut universitaire de cardiologie et de pneumologie du Quebec, Universite´ Laval, Quebec City, QC, Canada
| | - Andrew J Halayko
- Department of Physiology & Pathophysiology, Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada.,Biology of Breathing Group, Children's Hospital Research Institute of Manitoba, Winnipeg, MB, Canada
| | - Latifa Koussih
- Department of Immunology, Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada
| | - Abdelilah S Gounni
- Department of Immunology, Faculty of Health Sciences, College of Medicine, University of Manitoba, Winnipeg, MB, Canada
| |
Collapse
|
22
|
Movassagh H, Shan L, Duke-Cohan JS, Halayko AJ, Uzonna JE, Gounni AS. Semaphorin 3E Alleviates Hallmarks of House Dust Mite-Induced Allergic Airway Disease. THE AMERICAN JOURNAL OF PATHOLOGY 2017. [PMID: 28634005 DOI: 10.1016/j.ajpath.2017.03.008] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Semaphorins are an essential family of guidance cues ubiquitously expressed in various organs, which play diverse developmental, homeostatic, and pathological roles. Semaphorin 3E (Sema3E), initially identified as a neuronal chemorepellent, is involved in the regulation of cell migration, proliferation, and angiogenesis. However, expression and function of Sema3E in allergic asthma has not been extensively investigated. We determined the expression of Sema3E in the airways and its effect on airway inflammation, hyperresponsiveness, and remodeling as pathological features of allergic asthma provoked by house dust mite in vivo. Our data indicate that exposure to house dust mite markedly reduces Sema3E expression in mouse airways. More important, replenishment of Sema3E by intranasal administration of exogenous Sema3E protects mice from allergic asthma by reducing eosinophilic inflammation, serum IgE level, and T helper cell 2/T helper cell 17 cytokine response. The regulatory effect of Sema3E on cytokine response was sustained on allergen recall response in the lymph nodes and spleen. Furthermore, goblet cell hyperplasia, collagen deposition, and airway hyperresponsiveness were significantly diminished on Sema3E treatment. The inhibitory effect of Sema3E was associated with a reduction of pulmonary CD11b+ conventional dendritic cells and regulation of CD4+ T-cell cytokine response. Collectively, our data represent a novel approach to treating allergic asthma via regulation of immune response to house dust mite.
Collapse
Affiliation(s)
- Hesam Movassagh
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Lianyu Shan
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Jonathan S Duke-Cohan
- Department of Medical Oncology, Laboratory of Immunobiology, Dana-Farber Cancer Institute, Boston, Massachusetts; Department of Medicine, Harvard Medical School, Boston, Massachusetts
| | - Andrew J Halayko
- Department of Physiology and Pathophysiology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Jude E Uzonna
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Abdelilah S Gounni
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba, Canada.
| |
Collapse
|
23
|
Movassagh H, Shan L, Mohammed A, Halayko AJ, Gounni AS. Semaphorin 3E Deficiency Exacerbates Airway Inflammation, Hyperresponsiveness, and Remodeling in a Mouse Model of Allergic Asthma. THE JOURNAL OF IMMUNOLOGY 2017; 198:1805-1814. [PMID: 28108561 DOI: 10.4049/jimmunol.1601514] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Received: 08/30/2016] [Accepted: 12/19/2016] [Indexed: 01/17/2023]
Abstract
Semaphorin 3E (Sema3E) plays a crucial role in axon guidance, vascular patterning, and immune regulation. Nevertheless, the role of Sema3E in asthma is still elusive. In this study, we show that genetic ablation of Sema3E in mice results in increased lung granulocytosis, airway hyperresponsiveness, mucus overproduction, collagen deposition, and Th2/Th17 inflammation. Transfer of Sema3e-/- bone marrow progenitor cells to irradiated wild-type (WT) recipients exacerbates airway hyperresponsiveness and inflammation, whereas transfer of WT bone marrow progenitor cells ameliorates asthma pathology in Sema3e-/- recipients. Sema3e-/- mice display a higher frequency of CD11b+ pulmonary dendritic cells than their WT controls at the baseline and after sensitization with house dust mite. Adoptive transfer of CD11b+ pulmonary dendritic cells from Sema3e-/- mice into WT recipients increases house dust mite-induced Th2/Th17 inflammation in the airway. Together, these findings identify Sema3E as a novel regulatory molecule in allergic asthma that acts upstream of proallergic events and suggest that targeting this molecule could be a novel approach to treat allergic asthma.
Collapse
Affiliation(s)
- Hesam Movassagh
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada; and
| | - Lianyu Shan
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada; and
| | - Ashfaque Mohammed
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada; and
| | - Andrew J Halayko
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada; and.,Department of Physiology and Pathophysiology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5 Canada
| | - Abdelilah S Gounni
- Department of Immunology, Rady Faculty of Health Sciences, Max Rady College of Medicine, University of Manitoba, Winnipeg, Manitoba R3E 0T5, Canada; and
| |
Collapse
|
24
|
Wawrzyniak P, Akdis CA, Finkelman FD, Rothenberg ME. Advances and highlights in mechanisms of allergic disease in 2015. J Allergy Clin Immunol 2016; 137:1681-1696. [PMID: 27090934 DOI: 10.1016/j.jaci.2016.02.010] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2016] [Revised: 02/03/2016] [Accepted: 02/17/2016] [Indexed: 01/08/2023]
Abstract
This review highlights some of the advances in mechanisms of allergic disease, particularly anaphylaxis, including food allergy, drug hypersensitivity, atopic dermatitis (AD), allergic conjunctivitis, and airway diseases. During the last year, a mechanistic advance in food allergy was achieved by focusing on mechanisms of allergen sensitization. Novel biomarkers and treatment for mastocytosis were presented in several studies. Novel therapeutic approaches in the treatment of atopic dermatitis and psoriasis showed that promising supplementation of the infant's diet in the first year of life with immunoactive prebiotics might have a preventive role against early development of AD and that therapeutic approaches to treat AD in children might be best directed to the correction of a TH2/TH1 imbalance. Several studies were published emphasizing the role of the epithelial barrier in patients with allergic diseases. An impaired skin barrier as a cause for sensitization to food allergens in children and its relationship to filaggrin mutations has been an important development. Numerous studies presented new approaches for improvement of epithelial barrier function and novel biologicals used in the treatment of inflammatory skin and eosinophilic diseases. In addition, novel transcription factors and signaling molecules that can develop as new possible therapeutic targets have been reported.
Collapse
Affiliation(s)
- Paulina Wawrzyniak
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zürich, Davos, Switzerland, Christine Kühne-Center for Allergy Research and Education (CK-CARE), Davos, Switzerland
| | - Cezmi A Akdis
- Swiss Institute of Allergy and Asthma Research (SIAF), University of Zürich, Davos, Switzerland, Christine Kühne-Center for Allergy Research and Education (CK-CARE), Davos, Switzerland.
| | - Fred D Finkelman
- Division of Allergy, Immunology and Rheumatology, Department of Internal Medicine, University of Cincinnati College of Medicine, and the Department of Medicine, Cincinnati Veterans Affairs Medical Center, Cincinnati, Ohio
| | - Marc E Rothenberg
- Division of Allergy and Immunology, Cincinnati Children's Hospital Medical Center, University of Cincinnati, Cincinnati, Ohio
| |
Collapse
|
25
|
Jiang H, Xie Y, Abel PW, Wolff DW, Toews ML, Panettieri RA, Casale TB, Tu Y. Regulator of G-protein signaling 2 repression exacerbates airway hyper-responsiveness and remodeling in asthma. Am J Respir Cell Mol Biol 2015; 53:42-9. [PMID: 25368964 DOI: 10.1165/rcmb.2014-0319oc] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
G protein-coupled receptors (GPCRs) are important regulators of cell functions in asthma. We recently reported that regulator of G-protein signaling (RGS) 2, a selective modulator of Gq-coupled GPCRs, is a key regulator of airway hyper-responsiveness (AHR), the pathophysiologic hallmark of asthma. Because RGS2 protein levels in airway cells were significantly lower in patients with asthma compared with patients without asthma, we further investigated the potential pathological importance of RGS2 repression in asthma. The human RGS2 gene maps to chromosome 1q31. We first screened patients with asthma for RGS2 gene promoter single-nucleotide polymorphisms (SNPs) and found significant differences in the distribution of two RGS2 SNPs (A638G, rs2746071 and C395G, rs2746072) between patients with asthma and nonasthmatic subjects. These two SNPs are always associated with each other and have the same higher prevalence in patients with asthma (65%) as compared with nonasthmatic subjects (35%). Point mutations corresponding to these SNPs decrease RGS2 promoter activity by 44%. The importance of RGS2 down-regulation was then determined in an acute IL-13 mouse model of asthma. Intranasal administration of IL-13 in mice also decreased RGS2 expression in lungs by ∼50% and caused AHR. Although naive RGS2 knockout (KO) mice exhibit spontaneous AHR, acute IL-13 exposure further increased AHR in RGS2 KO mice. Loss of RGS2 also significantly enhanced IL-13-induced mouse airway remodeling, including peribronchial smooth muscle thickening and fibrosis, without effects on goblet cell hyperplasia or airway inflammation in mice. Thus, genetic variations and increased inflammatory cytokines can lead to RGS2 repression, which exacerbates AHR and airway remodeling in asthma.
Collapse
Affiliation(s)
- Haihong Jiang
- 1 Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska
| | - Yan Xie
- 1 Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska
| | - Peter W Abel
- 1 Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska
| | - Dennis W Wolff
- 2 Department of Biomedical Sciences, University of South Carolina School of Medicine at Greenville, Greenville, South Carolina
| | - Myron L Toews
- 3 Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center, Omaha, Nebraska
| | - Reynold A Panettieri
- 4 Pulmonary, Allergy and Critical Care Division, Airways Biology Initiative, University of Pennsylvania, Philadelphia, Pennsylvania; and
| | - Thomas B Casale
- 5 Department of Internal Medicine, University of South Florida School of Medicine, Tampa, Florida
| | - Yaping Tu
- 1 Department of Pharmacology, Creighton University School of Medicine, Omaha, Nebraska
| |
Collapse
|
26
|
A fungal protease allergen provokes airway hyper-responsiveness in asthma. Nat Commun 2015; 6:6763. [PMID: 25865874 PMCID: PMC4396684 DOI: 10.1038/ncomms7763] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2014] [Accepted: 02/19/2015] [Indexed: 01/26/2023] Open
Abstract
Asthma, a common disorder that affects more than 250 million people worldwide, is defined by exaggerated bronchoconstriction to inflammatory mediators including acetylcholine, bradykinin, and histamine—also termed airway hyper-responsiveness Nearly 10% of people with asthma have severe, treatment-resistant disease, which is frequently associated with IgE sensitization to ubiquitous fungi, typically Aspergillus fumigatus. Here we show that a major Aspergillus fumigatus allergen, Asp f13, which is a serine protease, alkaline protease 1 (Alp 1), promotes airway hyper-responsiveness by infiltrating the bronchial submucosa and disrupting airway smooth muscle cell-extracellular matrix interactions. Alp 1-mediated extracellular matrix degradation evokes pathophysiological RhoA-dependent Ca2+ sensitivity and bronchoconstriction. These findings support a pathogenic mechanism in asthma and other lung diseases associated with epithelial barrier impairment, whereby airway smooth muscle cells respond directly to inhaled environmental allergens to generate airway hyper-responsiveness.
Collapse
|
27
|
Ionotropic and metabotropic proton-sensing receptors involved in airway inflammation in allergic asthma. Mediators Inflamm 2014; 2014:712962. [PMID: 25197168 PMCID: PMC4147257 DOI: 10.1155/2014/712962] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 07/10/2014] [Accepted: 07/24/2014] [Indexed: 12/19/2022] Open
Abstract
An acidic microenvironment has been shown to evoke a variety of airway responses, including cough, bronchoconstriction, airway hyperresponsiveness (AHR), infiltration of inflammatory cells in the lung, and stimulation of mucus hyperproduction. Except for the participation of transient receptor potential vanilloid-1 (TRPV1) and acid-sensing ion channels (ASICs) in severe acidic pH (of less than 6.0)-induced cough and bronchoconstriction through sensory neurons, the molecular mechanisms underlying extracellular acidic pH-induced actions in the airways have not been fully understood. Recent studies have revealed that ovarian cancer G protein-coupled receptor 1 (OGR1)-family G protein-coupled receptors, which sense pH of more than 6.0, are expressed in structural cells, such as airway smooth muscle cells and epithelial cells, and in inflammatory and immune cells, such as eosinophils and dendritic cells. They function in a variety of airway responses related to the pathophysiology of inflammatory diseases, including allergic asthma. In the present review, we discuss the roles of ionotropic TRPV1 and ASICs and metabotropic OGR1-family G protein-coupled receptors in the airway inflammation and AHR in asthma and respiratory diseases.
Collapse
|