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Reddy-Vari H, Kim Y, Rajput C, Sajjan US. Increased expression of miR146a dysregulates TLR2-induced HBD2 in airway epithelial cells from patients with COPD. ERJ Open Res 2023; 9:00694-2022. [PMID: 37228294 PMCID: PMC10204848 DOI: 10.1183/23120541.00694-2022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 02/23/2023] [Indexed: 05/27/2023] Open
Abstract
Background Airway epithelial cells from patients with COPD show suboptimal innate immune responses to nontypeable Haemophilus influenzae (NTHi) and Toll-like receptor (TLR)2 ligands despite expressing TLR2 similar to normal airway epithelial cells, but the underlying mechanisms are poorly understood. Methods Normal or COPD mucociliary-differentiated airway epithelial cells were treated with TLR2 agonists or infected with NTHi and expression of β-defensin (HBD)2 was examined. Interleukin-1 receptor-associated kinase (IRAK)-1 and microRNA (miR)146a were genetically inhibited in normal and COPD airway epithelial cell cultures, respectively, and HBD2 responses to TLR2 ligands were determined. IRAK-1 expression in lung sections was determined by immunofluorescence microscopy. Results Compared to normal, COPD airway epithelial cell cultures showed impaired expression of HBD2 in response to TLR2 agonists or NTHi infection. Apical secretions from TLR2 agonist-treated normal, but not COPD, airway epithelial cells efficiently killed NTHi. Knockdown of HBD2 significantly reduced NTHi killing by apical secretions of normal airway epithelial cells. Compared to normal, COPD cells showed significantly reduced expression of IRAK-1 and this was associated with increased expression of miR146a. Inhibition of miR146a increased the expression of IRAK-1, improved the expression of HBD2 in response to TLR2 agonists in COPD cells and enhanced the killing of bacteria by apical secretions obtained from TLR2 agonist-treated COPD cells. Bronchial epithelium of COPD patients showed reduced expression of IRAK-1. Conclusions These results suggest that reduced levels of IRAK-1 due to increased expression of miR146a may contribute to impaired expression of TLR2-induced HBD2 in COPD airway epithelial cells.
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Affiliation(s)
- Hymavathi Reddy-Vari
- Department of Microbiology Immunology and Inflammation, Lewis Katz Medical School, Temple University, Philadelphia, PA, USA
| | - Yerin Kim
- Department of Microbiology Immunology and Inflammation, Lewis Katz Medical School, Temple University, Philadelphia, PA, USA
| | - Charu Rajput
- Department of Microbiology Immunology and Inflammation, Lewis Katz Medical School, Temple University, Philadelphia, PA, USA
| | - Umadevi S. Sajjan
- Department of Microbiology Immunology and Inflammation, Lewis Katz Medical School, Temple University, Philadelphia, PA, USA
- Department of Thoracic Surgery and Medicine, Lewis Katz Medical School, Temple University, Philadelphia, PA, USA
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Kelsen SG, Braverman AS, Aksoy MO, Hayman JA, Patel PS, Rajput C, Zhao H, Fisher SG, Ruggieri MR, Gentile NT. SARS-CoV-2 BNT162b2 vaccine-induced humoral response and reactogenicity in individuals with prior COVID-19 disease. JCI Insight 2022; 7:155889. [PMID: 35019861 PMCID: PMC8876462 DOI: 10.1172/jci.insight.155889] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Accepted: 01/05/2022] [Indexed: 11/17/2022] Open
Abstract
BACKGROUND Most individuals with prior COVID-19 disease manifest long-term protective immune responses against reinfection. Accordingly, we tested the hypothesis that humoral immune and reactogenicity responses to a SARS-CoV-2 mRNA vaccine differ in individuals with and without prior COVID-19 disease. METHODS Health care workers (n = 61) with (n = 30) and without (n = 31) prior COVID-19 disease received two 30 μg doses of Pfizer BNT162b2 vaccine 3 weeks apart. Serum IgG antibody against the spike receptor-binding domain; serum neutralizing activity; and vaccine reactogenicity were assessed longitudinally every 2 weeks for 56 days after the first injection. RESULTS The COVID-19 group manifested more rapid increases in spike IgG antibody and serum neutralizing activity after the first vaccine dose but showed little or no increase after the second dose compared with the infection-naive group. In fact, spike IgG was at its maximum level after the first dose in 36% of the COVID-19 group versus 0% of the infection-naive group. Peak IgG antibody levels were lower but appeared to fall more slowly in the COVID-19 group versus the infection-naive group. Finally, adverse systemic reactions, e.g., fever, headache, and malaise, were more frequent and lasted longer after both the first and second injection in the COVID-19 group than in the infection-naive group. CONCLUSION Individuals with prior COVID-19 disease demonstrate a robust, accelerated humoral immune response to the first dose but an attenuated response to the second dose of BNT162b2 vaccine compared with controls. The COVID-19 group also experienced greater reactogenicity. Humoral responses and reactogenicity to BNT162b2 differ qualitatively and quantitatively in individuals with prior COVID-19 disease compared with infection-naive individuals. FUNDING This work was supported by Temple University institutional funds.
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Affiliation(s)
- Steven G Kelsen
- Departments of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Alan S Braverman
- Department of Anatomy, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Mark O Aksoy
- Departments of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Jacob A Hayman
- Departments of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Puja S Patel
- Departments of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Charu Rajput
- Departments of Thoracic Medicine and Surgery, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Huaqing Zhao
- Department of Biomedical Education and Data Science, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Susan G Fisher
- Department of Biomedical Education and Data Science, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Michael R Ruggieri
- Department of Anatomy, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
| | - Nina T Gentile
- Department of Emergency Medicine, Lewis Katz School of Medicine at Temple University, Philadelphia, United States of America
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Rajput C, Han M, Ishikawa T, Lei J, Goldsmith AM, Jazaeri S, Stroupe CC, Bentley JK, Hershenson MB. Rhinovirus C Infection Induces Type 2 Innate Lymphoid Cell Expansion and Eosinophilic Airway Inflammation. Front Immunol 2021; 12:649520. [PMID: 33968043 PMCID: PMC8100319 DOI: 10.3389/fimmu.2021.649520] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Accepted: 04/07/2021] [Indexed: 12/21/2022] Open
Abstract
Rhinovirus C (RV-C) infection is associated with severe asthma exacerbations. Since type 2 inflammation is an important disease mechanism in asthma, we hypothesized that RV-C infection, in contrast to RV-A, preferentially stimulates type 2 inflammation, leading to exacerbated eosinophilic inflammation. To test this, we developed a mouse model of RV-C15 airways disease. RV-C15 was generated from the full-length cDNA clone and grown in HeLa-E8 cells expressing human CDHR3. BALB/c mice were inoculated intranasally with 5 x 106 ePFU RV-C15, RV-A1B or sham. Mice inoculated with RV-C15 showed lung viral titers of 1 x 105 TCID50 units 24 h after infection, with levels declining thereafter. IFN-α, β, γ and λ2 mRNAs peaked 24-72 hrs post-infection. Immunofluorescence verified colocalization of RV-C15, CDHR3 and acetyl-α-tubulin in mouse ciliated airway epithelial cells. Compared to RV-A1B, mice infected with RV-C15 demonstrated higher bronchoalveolar eosinophils, mRNA expression of IL-5, IL-13, IL-25, Muc5ac and Gob5/Clca, protein production of IL-5, IL-13, IL-25, IL-33 and TSLP, and expansion of type 2 innate lymphoid cells. Analogous results were found in mice treated with house dust mite before infection, including increased airway responsiveness. In contrast to Rorafl/fl littermates, RV-C-infected Rorafl/flIl7rcre mice deficient in ILC2s failed to show eosinophilic inflammation or mRNA expression of IL-13, Muc5ac and Muc5b. We conclude that, compared to RV-A1B, RV-C15 infection induces ILC2-dependent type 2 airway inflammation, providing insight into the mechanism of RV-C-induced asthma exacerbations.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Marc B. Hershenson
- Department of Pediatrics, University of Michigan Medical School, Ann Arbor, MI, United States
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4
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Han M, Ishikawa T, Bermick JR, Rajput C, Lei J, Goldsmith AM, Jarman CR, Lee J, Bentley JK, Hershenson MB. IL-1β prevents ILC2 expansion, type 2 cytokine secretion, and mucus metaplasia in response to early-life rhinovirus infection in mice. Allergy 2020; 75:2005-2019. [PMID: 32086822 DOI: 10.1111/all.14241] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 01/15/2020] [Accepted: 01/18/2020] [Indexed: 01/06/2023]
Abstract
BACKGROUND Early-life wheezing-associated respiratory infection with human rhinovirus (RV) is associated with asthma development. RV infection of 6-day-old immature mice causes mucous metaplasia and airway hyperresponsiveness which is associated with the expansion of IL-13-producing type 2 innate lymphoid cells (ILC2s) and dependent on IL-25 and IL-33. We examined regulation of this asthma-like phenotype by IL-1β. METHODS Six-day-old wild-type or NRLP3-/- mice were inoculated with sham or RV-A1B. Selected mice were treated with IL-1 receptor antagonist (IL-1RA), anti-IL-1β, or recombinant IL-1β. RESULTS Rhinovirus infection induced Il25, Il33, Il4, Il5, Il13, muc5ac, and gob5 mRNA expression, ILC2 expansion, mucus metaplasia, and airway hyperresponsiveness. RV also induced lung mRNA and protein expression of pro-IL-1β and NLRP3 as well as cleavage of caspase-1 and pro-IL-1β, indicating inflammasome priming and activation. Lung macrophages were a major source of IL-1β. Inhibition of IL-1β signaling with IL-1RA, anti-IL-1β, or NLRP3 KO increased RV-induced type 2 cytokine immune responses, ILC2 number, and mucus metaplasia, while decreasing IL-17 mRNA expression. Treatment with IL-1β had the opposite effect, decreasing IL-25, IL-33, and mucous metaplasia while increasing IL-17 expression. IL-1β and IL-17 each suppressed Il25, Il33, and muc5ac mRNA expression in cultured airway epithelial cells. Finally, RV-infected 6-day-old mice showed reduced IL-1β mRNA and protein expression compared to mature mice. CONCLUSION Macrophage IL-1β limits type 2 inflammation and mucous metaplasia following RV infection by suppressing epithelial cell innate cytokine expression. Reduced IL-1β production in immature animals provides a mechanism permitting asthma development after early-life viral infection.
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Affiliation(s)
- Mingyuan Han
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Tomoko Ishikawa
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Jennifer R. Bermick
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Charu Rajput
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Jing Lei
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Adam M. Goldsmith
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Caitlin R. Jarman
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Julie Lee
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - J. Kelley Bentley
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
| | - Marc B. Hershenson
- Departments of Pediatrics University of Michigan Medical School Ann Arbor Michigan
- Departments of Molecular and Integrative Physiology University of Michigan Medical School Ann Arbor Michigan
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Abstract
Airway epithelial cells, which lines the respiratory mucosa is in direct contact with the environment. Airway epithelial cells are the primary target for rhinovirus and other inhaled pathogens. In response to rhinovirus infection, airway epithelial cells mount both pro-inflammatory responses and antiviral innate immune responses to clear the virus efficiently. Some of the antiviral responses include the expression of IFNs, endoplasmic reticulum stress induced unfolded protein response and autophagy. Airway epithelial cells also recruits other innate immune cells to establish antiviral state and resolve the inflammation in the lungs. In patients with chronic lung disease, these responses may be either defective or induced in excess leading to deficient clearing of virus and sustained inflammation. In this review, we will discuss the mechanisms underlying antiviral innate immunity and the dysregulation of some of these mechanisms in patients with chronic lung diseases.
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Affiliation(s)
- Haleh Ganjian
- Department of Thoracic Medicine and Surgery, Lewis Katz Medical School, Temple University, Philadelphia, PA, United States
| | - Charu Rajput
- Department of Thoracic Medicine and Surgery, Lewis Katz Medical School, Temple University, Philadelphia, PA, United States
| | - Manal Elzoheiry
- Department of Thoracic Medicine and Surgery, Lewis Katz Medical School, Temple University, Philadelphia, PA, United States
| | - Umadevi Sajjan
- Department of Thoracic Medicine and Surgery, Lewis Katz Medical School, Temple University, Philadelphia, PA, United States
- Department of Physiology, Lewis Katz Medical School, Temple University, Philadelphia, PA, United States
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6
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Abstract
Early-life wheezing-associated infections with human rhinovirus (HRV) are strongly associated with the inception of asthma. The immune system of immature mice and humans is skewed toward a type 2 cytokine response. Thus, HRV-infected 6-day-old mice but not adult mice develop augmented type 2 cytokine expression, eosinophilic inflammation, mucous metaplasia, and airway hyperresponsiveness. This asthma phenotype depends on interleukin (IL)-13-producing type 2 innate lymphoid cells, the expansion of which in turn depends on release of the innate cytokines IL-25, IL-33, and thymic stromal lymphopoietin from the airway epithelium. In humans, certain genetic variants may predispose to HRV-induced childhood asthma.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Medical Sciences Research Building II, 1150 West Medical Center Drive, Ann Arbor, MI, USA
| | - Charu Rajput
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Medical Sciences Research Building II, 1150 West Medical Center Drive, Ann Arbor, MI, USA
| | - Marc B Hershenson
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Medical Sciences Research Building II, 1150 West Medical Center Drive, Ann Arbor, MI, USA; Department of Molecular and Integrative Physiology, University of Michigan Medical School, Medical Sciences Research Building II, 1150 West Medical Center Drive, Ann Arbor, MI, USA.
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Han M, Bentley JK, Rajput C, Lei J, Ishikawa T, Jarman CR, Lee J, Goldsmith AM, Jackson WT, Hoenerhoff MJ, Lewis TC, Hershenson MB. Inflammasome activation is required for human rhinovirus-induced airway inflammation in naive and allergen-sensitized mice. Mucosal Immunol 2019; 12:958-968. [PMID: 31089187 PMCID: PMC6668626 DOI: 10.1038/s41385-019-0172-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 04/09/2019] [Accepted: 04/29/2019] [Indexed: 02/04/2023]
Abstract
Activation of the inflammasome is a key function of the innate immune response that regulates inflammation in response to microbial substances. Inflammasome activation by human rhinovirus (RV), a major cause of asthma exacerbations, has not been well studied. We examined whether RV induces inflammasome activation in vivo, molecular mechanisms underlying RV-stimulated inflammasome priming and activation, and the contribution of inflammasome activation to RV-induced airway inflammation and exacerbation. RV infection triggered lung mRNA and protein expression of pro-IL-1β and NLRP3, indicative of inflammasome priming, as well as cleavage of caspase-1 and pro-IL-1β, completing inflammasome activation. Immunofluorescence staining showed IL-1β in lung macrophages. Depletion with clodronate liposomes and adoptive transfer experiments showed macrophages to be required and sufficient for RV-induced inflammasome activation. TLR2 was required for RV-induced inflammasome priming in vivo. UV irradiation blocked inflammasome activation and RV genome was sufficient for inflammasome activation in primed cells. Naive and house dust mite-treated NLRP3-/- and IL-1β-/- mice, as well as IL-1 receptor antagonist-treated mice, showed attenuated airway inflammation and responsiveness following RV infection. We conclude that RV-induced inflammasome activation is required for maximal airway inflammation and hyperresponsiveness in naive and allergic mice. The inflammasome represents a molecular target for RV-induced asthma exacerbations.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - J. Kelley Bentley
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Charu Rajput
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Jing Lei
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Tomoko Ishikawa
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Caitlin R. Jarman
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Julie Lee
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Adam M. Goldsmith
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - William T. Jackson
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD 21201
| | - Mark J. Hoenerhoff
- Department of Unit for Laboratory Animal Medicine, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Toby C. Lewis
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109
| | - Marc B. Hershenson
- Department of Pediatrics,University of Michigan Medical School, Ann Arbor, MI 48109;,Department of Molecular and Integrative Physiology,University of Michigan Medical School, Ann Arbor, MI 48109
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Bentley JK, Han M, Jaipalli S, Hinde JL, Lei J, Ishikawa T, Goldsmith AM, Rajput C, Hershenson MB. Myristoylated rhinovirus VP4 protein activates TLR2-dependent proinflammatory gene expression. Am J Physiol Lung Cell Mol Physiol 2019; 317:L57-L70. [PMID: 30908938 DOI: 10.1152/ajplung.00365.2018] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Asthma exacerbations are often caused by rhinovirus (RV). We and others have shown that Toll-like receptor 2 (TLR2), a membrane surface receptor that recognizes bacterial lipopeptides and lipoteichoic acid, is required and sufficient for RV-induced proinflammatory responses in vitro and in vivo. We hypothesized that viral protein-4 (VP4), an internal capsid protein that is myristoylated upon viral replication and externalized upon viral binding, is a ligand for TLR2. Recombinant VP4 and myristoylated VP4 (MyrVP4) were purified by Ni-affinity chromatography. MyrVP4 was also purified from RV-A1B-infected HeLa cells by urea solubilization and anti-VP4 affinity chromatography. Finally, synthetic MyrVP4 was produced by chemical peptide synthesis. MyrVP4-TLR2 interactions were assessed by confocal fluorescence microscopy, fluorescence resonance energy transfer (FRET), and monitoring VP4-induced cytokine mRNA expression in the presence of anti-TLR2 and anti-VP4. MyrVP4 and TLR2 colocalized in TLR2-expressing HEK-293 cells, mouse bone marrow-derived macrophages, human bronchoalveolar macrophages, and human airway epithelial cells. Colocalization was absent in TLR2-null HEK-293 cells and blocked by anti-TLR2 and anti-VP4. Cy3-labeled MyrVP4 and Cy5-labeled anti-TLR2 showed an average fractional FRET efficiency of 0.24 ± 0.05, and Cy5-labeled anti-TLR2 increased and unlabeled MyrVP4 decreased FRET efficiency. MyrVP4-induced chemokine mRNA expression was higher than that elicited by VP4 alone and was attenuated by anti-TLR2 and anti-VP4. Cytokine expression was similarly increased by MyrVP4 purified from RV-infected HeLa cells and synthetic MyrVP4. We conclude that, during RV infection, MyrVP4 and TLR2 interact to generate a proinflammatory response.
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Affiliation(s)
- J Kelley Bentley
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Mingyuan Han
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Suraj Jaipalli
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Joanna L Hinde
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Jing Lei
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Tomoko Ishikawa
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Adam M Goldsmith
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Charu Rajput
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan
| | - Marc B Hershenson
- Departments of Pediatrics and Communicable Diseases, University of Michigan , Ann Arbor, Michigan.,Department of Molecular and Integrative Physiology, University of Michigan , Ann Arbor, Michigan
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Han M, Rajput C, Ishikawa T, Jarman CR, Lee J, Hershenson MB. Small Animal Models of Respiratory Viral Infection Related to Asthma. Viruses 2018; 10:E682. [PMID: 30513770 PMCID: PMC6316391 DOI: 10.3390/v10120682] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 11/21/2018] [Accepted: 11/29/2018] [Indexed: 12/20/2022] Open
Abstract
Respiratory viral infections are strongly associated with asthma exacerbations. Rhinovirus is most frequently-detected pathogen; followed by respiratory syncytial virus; metapneumovirus; parainfluenza virus; enterovirus and coronavirus. In addition; viral infection; in combination with genetics; allergen exposure; microbiome and other pathogens; may play a role in asthma development. In particular; asthma development has been linked to wheezing-associated respiratory viral infections in early life. To understand underlying mechanisms of viral-induced airways disease; investigators have studied respiratory viral infections in small animals. This report reviews animal models of human respiratory viral infection employing mice; rats; guinea pigs; hamsters and ferrets. Investigators have modeled asthma exacerbations by infecting mice with allergic airways disease. Asthma development has been modeled by administration of virus to immature animals. Small animal models of respiratory viral infection will identify cell and molecular targets for the treatment of asthma.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Charu Rajput
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Tomoko Ishikawa
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Caitlin R Jarman
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Julie Lee
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
| | - Marc B Hershenson
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.
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10
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Han M, Rajput C, Hinde JL, Wu Q, Lei J, Ishikawa T, Bentley JK, Hershenson MB. Construction of a recombinant rhinovirus accommodating fluorescent marker expression. Influenza Other Respir Viruses 2018; 12:717-727. [PMID: 30120824 PMCID: PMC6185886 DOI: 10.1111/irv.12602] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2018] [Revised: 07/02/2018] [Accepted: 08/15/2018] [Indexed: 12/28/2022] Open
Abstract
Background Rhinovirus (RV) causes the common cold and asthma exacerbations. The RV genome is a 7.3 kb single‐strand positive‐sense RNA. Objective Using minor group RV1A as a backbone, we sought to design and generate a recombinant RV1A accommodating fluorescent marker expression, thereby allowing tracking of viral infection. Method Recombinant RV1A infectious cDNA clones harboring the coding sequence of green fluorescent protein (GFP), Renilla luciferase, or iLOV (for light, oxygen, or voltage sensing) were engineered and constructed. RV‐infected cells were determined by flow cytometry, immunohistochemistry, and immunofluorescence microscopy. Results RV1A‐GFP showed a cytopathic effect in HeLa cells but failed to express GFP or Renilla luciferase due to deletion. The smaller fluorescent protein construct, RV1A‐iLOV, was stably expressed in infected cells. RV1A‐iLOV expression was used to examine the antiviral effect of bafilomycin in HeLa cells. Compared to parental virus, RV1A‐iLOV infection of BALB/c mice yielded a similar viral load and level of cytokine mRNA expression. However, imaging of fixed lung tissue failed to reveal a fluorescent signal, likely due to the oxidation and bleaching of iLOV‐bound flavin mononucleotide. We therefore employed an anti‐iLOV antibody for immunohistochemical and immunofluorescence imaging. The iLOV signal was identified in airway epithelial cells and CD45+ CD11b+ lung macrophages. Conclusions These results suggest that RV1A‐iLOV is a useful molecular tool for studying RV pathogenesis. The construction strategy for RV1A‐iLOV could be applied to other RV serotypes. However, the detection of iLOV‐expressing RV in fixed tissue required the use of an anti‐iLOV antibody, limiting the value of this construct.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Charu Rajput
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Joanna L Hinde
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Qian Wu
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Jing Lei
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Tomoko Ishikawa
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - J Kelley Bentley
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan
| | - Marc B Hershenson
- Department of Pediatrics & Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan.,Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
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11
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Rajput C, Han M, Bentley JK, Lei J, Ishikawa T, Wu Q, Hinde JL, Callear AP, Stillwell TL, Jackson WT, Martin ET, Hershenson MB. Enterovirus D68 infection induces IL-17-dependent neutrophilic airway inflammation and hyperresponsiveness. JCI Insight 2018; 3:121882. [PMID: 30135310 PMCID: PMC6141171 DOI: 10.1172/jci.insight.121882] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2018] [Accepted: 07/03/2018] [Indexed: 12/15/2022] Open
Abstract
Enterovirus D68 (EV-D68) shares biologic features with rhinovirus (RV). In 2014, a nationwide outbreak of EV-D68 was associated with severe asthma-like symptoms. We sought to develop a mouse model of EV-D68 infection and determine the mechanisms underlying airway disease. BALB/c mice were inoculated intranasally with EV-D68 (2014 isolate), RV-A1B, or sham, alone or in combination with anti-IL-17A or house dust mite (HDM) treatment. Like RV-A1B, lung EV-D68 viral RNA peaked 12 hours after infection. EV-D68 induced airway inflammation, expression of cytokines (TNF-α, IL-6, IL-12b, IL-17A, CXCL1, CXCL2, CXCL10, and CCL2), and airway hyperresponsiveness, which were suppressed by anti-IL-17A antibody. Neutrophilic inflammation and airway responsiveness were significantly higher after EV-D68 compared with RV-A1B infection. Flow cytometry showed increased lineage-, NKp46-, RORγt+ IL-17+ILC3s and γδ T cells in the lungs of EV-D68-treated mice compared with those in RV-treated mice. EV-D68 infection of HDM-exposed mice induced additive or synergistic increases in BAL neutrophils and eosinophils and expression of IL-17, CCL11, IL-5, and Muc5AC. Finally, patients from the 2014 epidemic period with EV-D68 showed significantly higher nasopharyngeal IL-17 mRNA levels compared with patients with RV-A infection. EV-D68 infection induces IL-17-dependent airway inflammation and hyperresponsiveness, which is greater than that generated by RV-A1B, consistent with the clinical picture of severe asthma-like symptoms.
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Affiliation(s)
- Charu Rajput
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Mingyuan Han
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - J. Kelley Bentley
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Jing Lei
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Tomoko Ishikawa
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Qian Wu
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Joanna L. Hinde
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - Amy P. Callear
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
| | - Terri L. Stillwell
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
| | - William T. Jackson
- Department of Microbiology and Immunology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Emily T. Martin
- Department of Epidemiology, University of Michigan School of Public Health, Ann Arbor, Michigan, USA
| | - Marc B. Hershenson
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan, USA
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan, USA
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12
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Rajput C, Walsh MP, Eder BN, Metitiri EE, Popova AP, Hershenson MB. Rhinovirus infection induces distinct transcriptome profiles in polarized human macrophages. Physiol Genomics 2018. [PMID: 29521598 DOI: 10.1152/physiolgenomics.00122.2017] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023] Open
Abstract
Infections with rhinovirus (RV) cause asthma exacerbations. Recent studies suggest that macrophages play a role in asthmatic airway inflammation and the innate immune response to RV infection. Macrophages exhibit phenotypes based on surface markers and gene expression. We hypothesized that macrophage polarization state alters gene expression in response to RV infection. Cells were derived from human peripheral blood derived monocytes. M1 and M2 polarization was carried out by using IFN-γ and IL-4, respectively, and RNA was extracted for Affymetrix Human Gene ST2.1 exon arrays. Selected genes were validated by quantitative (q)PCR. Treatment of nonactivated (M0) macrophages with IFN-γ and IL-4 induced the expression of 252 and 153 distinct genes, respectively, including previously-identified M1 and M2 markers. RV infection of M0 macrophages induced upregulation of 232 genes; pathway analysis showed significant overrepresentation of genes involved in IFN-α/β signaling and cytokine signaling in the immune system. RV infection induced differential expression of 195 distinct genes in M1-like macrophages but only seven distinct genes in M2-like-polarized cells. In a secondary analysis, comparison between M0-, RV-infected, and M1-like-polarized, RV-infected macrophages revealed differential expression of 227 genes including those associated with asthma and its exacerbation. qPCR demonstrated increased expression of CCL8, CXCL10, TNFSF10, TNFSF18, IL6, NOD2, and GSDMD and reduced expression of VNN1, AGO1, and AGO2. Together, these data show that, in contrast to M2-like-polarized macrophages, gene expression of M1-like macrophages is highly regulated by RV.
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Affiliation(s)
- Charu Rajput
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School , Ann Arbor, Michigan
| | - Megan P Walsh
- Department of Epidemiology, University of Michigan School of Public Health , Ann Arbor, MI
| | - Breanna N Eder
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School , Ann Arbor, Michigan
| | - Ediri E Metitiri
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School , Ann Arbor, Michigan
| | - Antonia P Popova
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School , Ann Arbor, Michigan
| | - Marc B Hershenson
- Departments of Pediatrics and Communicable Diseases, University of Michigan Medical School , Ann Arbor, Michigan.,Department of Molecular and Integrative Physiology, University of Michigan Medical School , Ann Arbor, Michigan
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13
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Han M, Rajput C, Hong JY, Lei J, Hinde JL, Wu Q, Bentley JK, Hershenson MB. The Innate Cytokines IL-25, IL-33, and TSLP Cooperate in the Induction of Type 2 Innate Lymphoid Cell Expansion and Mucous Metaplasia in Rhinovirus-Infected Immature Mice. J Immunol 2017; 199:1308-1318. [PMID: 28701507 DOI: 10.4049/jimmunol.1700216] [Citation(s) in RCA: 104] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Accepted: 06/14/2017] [Indexed: 12/31/2022]
Abstract
Early-life respiratory viral infection is a risk factor for asthma development. Rhinovirus (RV) infection of 6-d-old mice, but not mature mice, causes mucous metaplasia and airway hyperresponsiveness that are associated with the expansion of lung type 2 innate lymphoid cells (ILC2s) and are dependent on IL-13 and the innate cytokine IL-25. However, contributions of the other innate cytokines, IL-33 and thymic stromal lymphopoietin (TSLP), to the observed asthma-like phenotype have not been examined. We reasoned that IL-33 and TSLP expression are also induced by RV infection in immature mice and are required for maximum ILC2 expansion and mucous metaplasia. We inoculated 6-d-old BALB/c (wild-type) and TSLP receptor-knockout mice with sham HeLa cell lysate or RV. Selected mice were treated with neutralizing Abs to IL-33 or recombinant IL-33, IL-25, or TSLP. ILC2s were isolated from RV-infected immature mice and treated with innate cytokines ex vivo. RV infection of 6-d-old mice increased IL-33 and TSLP protein abundance. TSLP expression was localized to the airway epithelium, whereas IL-33 was expressed in epithelial and subepithelial cells. RV-induced mucous metaplasia, ILC2 expansion, airway hyperresponsiveness, and epithelial cell IL-25 expression were attenuated by anti-IL-33 treatment and in TSLP receptor-knockout mice. Administration of intranasal IL-33 and TSLP was sufficient for mucous metaplasia. Finally, TSLP was required for maximal ILC2 gene expression in response to IL-25 and IL-33. The generation of mucous metaplasia in immature RV-infected mice involves a complex interplay among the innate cytokines IL-25, IL-33, and TSLP.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Charu Rajput
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Jun Y Hong
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109
| | - Jing Lei
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Joanna L Hinde
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Qian Wu
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - J Kelley Bentley
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and
| | - Marc B Hershenson
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, MI 48109; and .,Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, MI 48109
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14
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Rajput C. Chronic Obstructive Pulmonary Disease Meta Genome-Wide Association Studies. New Insights into the Genetics of Chronic Obstructive Pulmonary Disease. Am J Respir Cell Mol Biol 2017; 57:1-2. [DOI: 10.1165/rcmb.2017-0070ed] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Affiliation(s)
- Charu Rajput
- Department of PediatricsUniversity of Michigan Medical SchoolAnn Arbor, Michigan
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15
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Han M, Hong JY, Jaipalli S, Rajput C, Lei J, Hinde JL, Chen Q, Hershenson NM, Bentley JK, Hershenson MB. IFN-γ Blocks Development of an Asthma Phenotype in Rhinovirus-Infected Baby Mice by Inhibiting Type 2 Innate Lymphoid Cells. Am J Respir Cell Mol Biol 2017; 56:242-251. [PMID: 27679954 DOI: 10.1165/rcmb.2016-0056oc] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
Early-life wheezing-associated infections with rhinovirus (RV) have been associated with asthma development in children. We have shown that RV infection of 6-day-old mice induces mucous metaplasia and airways hyperresponsiveness, which is dependent on IL-13, IL-25, and type 2 innate lymphoid cells (ILC2s). Infection of immature mice fails to induce lung IFN-γ expression, in contrast to mature 8-week-old mice with a robust IFN-γ response, consistent with the notion that deficient IFN-γ production in immature mice permits RV-induced type 2 immune responses. We therefore examined the effects of intranasal IFN-γ administration on RV-induced ILC2 expansion and IL-13 expression in 6-day-old BALB/c and IL-13 reporter mice. Airway responses were assessed by histology, immunofluorescence microscopy, quantitative polymerase chain reaction, ELISA, and flow cytometry. Lung ILC2s were also treated with IFN-γ ex vivo. We found that, compared with untreated RV-infected immature mice, IFN-γ treatment attenuated RV-induced IL-13 and Muc5ac mRNA expression and mucous metaplasia. IFN-γ also reduced ILC2 expansion and the percentage of IL-13-secreting ILC2s. IFN-γ had no effect on the mRNA or protein expression of IL-25, IL-33, or thymic stromal lymphoprotein. Finally, IFN-γ treatment of sorted ILC2s reduced IL-5, IL-13, IL-17RB, ST2, and GATA-3 mRNA expression. We conclude that, in immature mice, IFN-γ inhibits ILC2 expansion and IL-13 expression in vivo and ex vivo, thereby attenuating RV-induced mucous metaplasia. These findings demonstrate the antagonistic function of IFN-γ on ILC2 expansion and gene expression, the absence of which may contribute to the development of an asthma-like phenotype after early-life RV infection.
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Affiliation(s)
- Mingyuan Han
- Departments of 1 Pediatrics and Communicable Diseases, and
| | - Jun Young Hong
- 2 Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
| | - Suraj Jaipalli
- Departments of 1 Pediatrics and Communicable Diseases, and
| | - Charu Rajput
- Departments of 1 Pediatrics and Communicable Diseases, and
| | - Jing Lei
- Departments of 1 Pediatrics and Communicable Diseases, and
| | - Joanna L Hinde
- Departments of 1 Pediatrics and Communicable Diseases, and
| | - Qiang Chen
- Departments of 1 Pediatrics and Communicable Diseases, and
| | | | | | - Marc B Hershenson
- Departments of 1 Pediatrics and Communicable Diseases, and.,2 Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
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16
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Rajput C, Cui T, Han M, Lei J, Hinde JL, Wu Q, Bentley JK, Hershenson MB. RORα-dependent type 2 innate lymphoid cells are required and sufficient for mucous metaplasia in immature mice. Am J Physiol Lung Cell Mol Physiol 2017; 312:L983-L993. [PMID: 28360114 DOI: 10.1152/ajplung.00368.2016] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Revised: 03/22/2017] [Accepted: 03/27/2017] [Indexed: 01/09/2023] Open
Abstract
Early-life wheezing-associated respiratory tract infection by rhinovirus (RV) is considered a risk factor for asthma development. We have shown that RV infection of 6-day-old BALB/c mice, but not mature mice, induces an asthmalike phenotype that is associated with an increase in the population of type 2 innate lymphoid cells (ILC2s) and dependent on IL-13 and IL-25. We hypothesize that ILC2s are required and sufficient for development of the asthmalike phenotype in immature mice. Mice were infected with RV1B on day 6 of life and treated with vehicle or a chemical inhibitor of retinoic acid receptor-related orphan receptor-α (RORα), SR3335 (15 mg·kg-1·day-1 ip for 7 days). We also infected Rorasg/sg mice without functional ILC2s. ILC2s were identified as negative for lineage markers and positive for cluster of differentiation 25 (CD25)/IL-2Rα and CD127/IL-7Rα. Effects of SR3335 on proliferation and function of cultured ILC2s were determined. Finally, sorted ILC2s were transferred into naïve mice, and lungs were harvested 14 days later for assessment of gene expression and histology. SR3335 decreased the number of RV-induced lung lineage-negative, CD25+, CD127+ ILC2s in immature mice. SR3335 also attenuated lung mRNA expression of IL-13, Muc5ac, and Gob5 as well as mucous metaplasia. We also found reduced expansion of ILC2s in RV-infected Rorasg/sg mice. SR3335 also blocked IL-25 and IL-33-induced ILC2 proliferation and IL-13 production ex vivo. Finally, adoptive transfer of ILC2s led to development of asthmalike phenotype in immature and adult mice. RORα-dependent ILC2s are required and sufficient for type 2 cytokine expression and mucous metaplasia in immature mice.
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Affiliation(s)
- Charu Rajput
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Tracy Cui
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Mingyuan Han
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Jing Lei
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Joanna L Hinde
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Qian Wu
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - J Kelley Bentley
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and
| | - Marc B Hershenson
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Michigan; and .,Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Michigan
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17
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Han M, Chung Y, Young Hong J, Rajput C, Lei J, Hinde JL, Chen Q, Weng SP, Bentley JK, Hershenson MB. Toll-like receptor 2-expressing macrophages are required and sufficient for rhinovirus-induced airway inflammation. J Allergy Clin Immunol 2016; 138:1619-1630. [PMID: 27084403 DOI: 10.1016/j.jaci.2016.01.037] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2015] [Revised: 12/29/2015] [Accepted: 01/22/2016] [Indexed: 12/26/2022]
Abstract
BACKGROUND We have shown that rhinovirus, a cause of asthma exacerbation, colocalizes with CD68+ and CD11b+ airway macrophages after experimental infection in human subjects. We have also shown that rhinovirus-induced cytokine expression is abolished in Toll-like receptor (TLR2)-/- bone marrow-derived macrophages. OBJECTIVE We hypothesize that TLR2+ macrophages are required and sufficient for rhinovirus-induced airway inflammation in vivo. METHODS Naive and ovalbumin (OVA)-sensitized and challenged C57BL/6 wild-type and TLR2-/- mice were infected with RV1B, followed by IgG or anti-TLR2, to determine the requirement and sufficiency of TLR2 for rhinovirus-induced airway responses. Bone marrow chimera experiments using OVA-treated C57BL/6 and TLR2-/- mice were also performed. Finally, naive TLR2-/- mice underwent intranasal transfer of bone marrow-derived wild-type macrophages. RESULTS RV1B infection of naive wild-type mice induced an influx of airway neutrophils and CD11b+ exudative macrophages, which was reduced in TLR2-/- mice. After allergen exposure, rhinovirus-induced neutrophilic and eosinophilic airway inflammation and hyperresponsiveness were reduced in TLR2-/- and anti-TLR2-treated mice. Transfer of TLR2-/- bone marrow into wild-type, OVA-treated C57BL/6 mice blocked rhinovirus-induced airway responses, whereas transfer of wild-type marrow to TLR2-/- mice restored them. Finally, transfer of wild-type macrophages to naive TLR2-/- mice was sufficient for neutrophilic inflammation after rhinovirus infection, whereas macrophages treated with IL-4 (to induce M2 polarization) were sufficient for eosinophilic inflammation, mucous metaplasia, and airways hyperresponsiveness. CONCLUSIONS TLR2 is required for early inflammatory responses induced by rhinovirus, and TLR2+ macrophages are sufficient to confer airway inflammation to TLR2-/- mice, with the pattern of inflammation depending on the macrophage activation state.
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Affiliation(s)
- Mingyuan Han
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Yutein Chung
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Jun Young Hong
- Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Mich
| | - Charu Rajput
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Jing Lei
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Joanna L Hinde
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Qiang Chen
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Steven P Weng
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - J Kelley Bentley
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich
| | - Marc B Hershenson
- Department of Pediatrics and Communicable Diseases, University of Michigan Medical School, Ann Arbor, Mich; Department of Molecular and Integrative Physiology, University of Michigan Medical School, Ann Arbor, Mich.
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18
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Rajput C, Tauseef M, Farazuddin M, Yazbeck P, Amin MR, Avin Br V, Sharma T, Mehta D. MicroRNA-150 Suppression of Angiopoetin-2 Generation and Signaling Is Crucial for Resolving Vascular Injury. Arterioscler Thromb Vasc Biol 2016; 36:380-8. [PMID: 26743170 DOI: 10.1161/atvbaha.115.306997] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2015] [Accepted: 12/17/2015] [Indexed: 12/27/2022]
Abstract
OBJECTIVE Increased vascular permeability is a hallmark of sepsis and acute respiratory distress syndrome. Angiopoietin (Ang2) induces vascular leak, and excess Ang2 generation is associated with patient mortality from these diseases. However, mechanisms dampening Ang2 generation during injury remain unclear. Interestingly, microRNA (miR)-150 levels were decreased in septic patients. miR regulate signaling networks by silencing mRNAs containing complementary sequences. Thus, we hypothesized that miR-150 suppresses Ang2 generation and thereby resolves vascular injury. APPROACH AND RESULTS Wild-type or miR-150(-/-) mice or endothelial cells were exposed to lipopolysaccharide or sepsis, and Ang2 levels, adherens junction reannealing, endothelial barrier function, and mortality were determined. Although Ang2 transiently increased during lipopolysaccharide-induced injury in wild-type endothelial cells and lungs, miR-150 expression was elevated only during recovery from injury. Deletion of miR-150 caused a persistent increase in Ang2 levels and impaired adherens junctions reannealing after injury, resulting thereby in an irreversible increase in vascular permeability. Also, miR-150(-/-) mice died rapidly after sepsis. Rescuing miR-150 expression in endothelial cells prevented Ang2 generation, thereby restoring vascular barrier function in miR-150(-/-) mice. miR-150 terminated Ang2 generation by targeting the transcription factor, early growth response 2. Thus, early growth response 2 or Ang2 depletion in miR-150(-/-) endothelial cells restored junctional reannealing and reinstated barrier function. Importantly, upregulating miR-150 expression by injecting a chemically synthesized miR-150 mimic into wild-type mice vasculature decreased early growth response 2 and Ang2 levels and hence mortality from sepsis. CONCLUSIONS miR-150 is a novel suppressor of Ang2 generation with a key role in resolving vascular injury and reducing mortality resulting from sepsis.
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Affiliation(s)
- Charu Rajput
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Mohammad Tauseef
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Mohammad Farazuddin
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Pascal Yazbeck
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Md-Ruhul Amin
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Vijay Avin Br
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Tiffany Sharma
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago
| | - Dolly Mehta
- From the Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois at Chicago.
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Tauseef M, Farazuddin M, Sukriti S, Rajput C, Meyer JO, Ramasamy SK, Mehta D. Transient receptor potential channel 1 maintains adherens junction plasticity by suppressing sphingosine kinase 1 expression to induce endothelial hyperpermeability. FASEB J 2015; 30:102-10. [PMID: 26316271 DOI: 10.1096/fj.15-275891] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2015] [Accepted: 08/13/2015] [Indexed: 12/13/2022]
Abstract
Stability of endothelial cell (EC) adherens junctions (AJs) is central for prevention of tissue edema, the hallmark of chronic inflammatory diseases including acute respiratory distress syndrome. Here, we demonstrate a previously unsuspected role of sphingosine kinase 1 (SPHK1) in the mechanism by which transient receptor potential channel 1 (Trpc1)-mediated Ca(2+) entry destabilizes AJs. Trpc1(-/-) monolayers showed a 2.2-fold increase in vascular endothelial (VE)-cadherin cell-surface expression above wild-type (WT) monolayers. Thrombin increased endothelial permeability (evident by a 5-fold increase in interendothelial gap area and 60% decrease in transendothelial electrical resistance) in WT but not Trpc1(-/-) ECs. Trpc1(-/-) mice resisted the hyperpermeability effects of the edemagenic agonists used and exhibited 60% less endotoxin-induced mortality. Because sphingosine-1-phosphate (S1P) strengthens AJs, we determined if TRPC1 functioned by inhibiting SPHK1 activity, which generates S1P. Intriguingly, Trpc1(-/-) ECs or ECs transducing a TRPC1-inactive mutant showed a 1.5-fold increase in basal SPHK1 expression compared with WT ECs, resulting in a 2-fold higher S1P level. SPHK1 inhibitor SK1-I decreased basal transendothelial electrical resistance more in WT ECs (48 and 72% reduction at 20 and 50 μM, respectively) than in Trpc1(-/-) ECs. However, SK1-I pretreatment rescued thrombin-induced EC permeability in Trpc1(-/-) ECs. Thus, TRPC1 suppression of basal SPHK1 activity enables EC-barrier destabilization by edemagenic agonists.
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Affiliation(s)
- Mohammad Tauseef
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - Mohammad Farazuddin
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - Sukriti Sukriti
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - Charu Rajput
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - James Otto Meyer
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - Suresh Kumar Ramasamy
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
| | - Dolly Mehta
- Department of Pharmacology and Center for Lung and Vascular Biology, University of Illinois College of Medicine, Chicago, Illinois, USA
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20
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Chavez A, Schmidt TT, Yazbeck P, Rajput C, Desai B, Sukriti S, Giantsos-Adams K, Knezevic N, Malik AB, Mehta D. S1PR1 Tyr143 phosphorylation downregulates endothelial cell surface S1PR1 expression and responsiveness. J Cell Sci 2015; 128:878-87. [PMID: 25588843 DOI: 10.1242/jcs.154476] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Activation of sphingosine-1-phosphate receptor 1 (S1PR1) plays a key role in repairing endothelial barrier function. We addressed the role of phosphorylation of the three intracellular tyrosine residues of S1PR1 in endothelial cells in regulating the receptor responsiveness and endothelial barrier function regulated by sphingosine 1-phosphate (S1P)-mediated activation of S1PR1. We demonstrated that phosphorylation of only Y143 site was required for S1PR1 internalization in response to S1P. Maximal S1PR1 internalization was seen in 20 min but S1PR1 returned to the cell surface within 1 h accompanied by Y143-dephosphorylation. Cell surface S1PR1 loss paralleled defective endothelial barrier enhancement induced by S1P. Expression of phospho-defective (Y143F) or phospho-mimicking (Y143D) mutants, respectively, failed to internalize or showed unusually high receptor internalization, consistent with the requirement of Y143 in regulating cell surface S1PR1 expression. Phosphorylation of the five S1PR1 C-terminal serine residues did not affect the role of Y143 phosphorylation in signaling S1PR1 internalization. Thus, rapid reduction of endothelial cell surface expression of S1PR1 subsequent to Y143 phosphorylation is a crucial mechanism of modulating S1PR1 signaling, and hence the endothelial barrier repair function of S1P.
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Affiliation(s)
- Alejandra Chavez
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Tracy Thennes Schmidt
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Pascal Yazbeck
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Charu Rajput
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Bhushan Desai
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Sukriti Sukriti
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Kristina Giantsos-Adams
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Nebojsa Knezevic
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Asrar B Malik
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
| | - Dolly Mehta
- Department of Pharmacology and Center for Lung and Vascular Biology, The University of Illinois College of Medicine, Chicago, IL 60612, USA
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Rajput C, Kini V, Smith M, Yazbeck P, Chavez A, Schmidt T, Zhang W, Knezevic N, Komarova Y, Mehta D. Neural Wiskott-Aldrich syndrome protein (N-WASP)-mediated p120-catenin interaction with Arp2-Actin complex stabilizes endothelial adherens junctions. J Biol Chem 2012; 288:4241-50. [PMID: 23212915 DOI: 10.1074/jbc.m112.440396] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Stable adherens junctions (AJs) are required for formation of restrictive endothelial barrier. Vascular endothelial cadherin from contiguous endothelial cells forms AJs, which are stabilized intracellularly by binding of p120-catenin and cortical actin. Mechanisms inducing cortical actin formation and enabling its linkage with p120-catenin remain enigmatic. We altered the function of neural Wiskott-Aldrich syndrome protein (N-WASP), which induces actin polymerization through actin-related protein 2/3 complex (Arp2/3), to address the role of N-WASP in regulating AJ stability and thereby endothelial permeability. We show that depletion of N-WASP in endothelial cells impaired AJ adhesion and favored the organization of actin from cortical actin to stress fibers, resulting thereby in formation of leaky endothelial barrier. Exposure of the N-WASP-depleted endothelial cell monolayer to the permeability-increasing mediator, thrombin, exaggerated AJ disruption and stress fiber formation, leading to an irreversible increase in endothelial permeability. We show that N-WASP binds p120-catenin through its verprolin cofilin acid (VCA) domain, induces cortical actin formation through Arp2, and links p120-catenin with cortical actin. The interaction of N-WASP with p120-catenin, actin, and Arp2 requires phosphorylation of N-WASP at the Tyr-256 residue by focal adhesion kinase. Expression of the VCA domain of N-WASP or phosphomimicking (Y256D)-N-WASP mutant in endothelial cells stabilizes AJs and facilitates barrier recovery after thrombin stimulation. Our study demonstrates that N-WASP, by mediating p120-catenin interaction with actin-polymerizing machinery, maintains AJs and mitigates disruption of endothelial barrier function by edemagenic agents, therefore representing a novel target for preventing leaky endothelial barrier syndrome.
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Affiliation(s)
- Charu Rajput
- Department of Pharmacology and Center for Lung and Vascular Biology, College of Medicine, University of Illinois, Chicago, Illinois 60612, USA
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Rajput C, Tauseef M, Yazbeck P, Thennes T, Mehta D. miR‐150 prevents pulmonary inflammation by regulating Interleukin‐1R associated kinase‐2 downstream of focal adhesion kinase. FASEB J 2012. [DOI: 10.1096/fasebj.26.1_supplement.671.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Arif E, Ahsan A, Vibhuti A, Rajput C, Deepak D, Athar M, Singh B, Pasha MAQ. Endothelial nitric oxide synthase gene variants contribute to oxidative stress in COPD. Biochem Biophys Res Commun 2007; 361:182-8. [PMID: 17658478 DOI: 10.1016/j.bbrc.2007.07.008] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Accepted: 07/05/2007] [Indexed: 10/23/2022]
Abstract
Nitric oxide (NO) plays critical role in endothelial dysfunction and oxidative stress in COPD, pointing to the significance of endothelial nitric oxide synthase gene (eNOS) variants. We investigated the association of -786T/C, -922A/G, 4B/4A, and 894G/T polymorphisms of eNOS with the disease and its impact on nitrite and malonaldehyde levels in 190 COPD patients and 134 healthy controls, all smokers. The -786C, -922G and 4A alleles were significantly over-represented in patients (p=0.02, p=0.02, and p=0.03, respectively). The haplotypes, -786C:4A, 4A:894G, -786C:894G, and -786C:4A:894G were significantly over-represented in patients (p<0.0001, p =0.02, p=0.02, and p <0.0001, respectively), whereas, haplotypes, -786T:4B, 4B:894G, -786T:894G, and -786T:4B:894G were significantly under-represented in the patients (p<0.0001). The patients had significantly increased levels of nitrite (p=0.003) and malonaldehyde (p<0.0001). Combination of genotypes containing -786C and 4A alleles were greater in patients (p 0.05), and these combinations associated with decreased FEV1 value and nitrite level (p=0.03 and p=0.04, respectively) and with increased malonaldehyde levels (p=0.02). The eNOS -786C, -922G, and 4A alleles, these alleles associated haplotypes and genotype combinations were over-represented in patients. The variants and their combinations of four polymorphisms of eNOS contribute to disturbed pulmonary function and oxidative stress in COPD.
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Affiliation(s)
- Ehtesham Arif
- Functional Genomics Unit, Institute of Genomics and Integrative Biology, Delhi 110 007, India
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Rajput C, Arif E, Vibhuti A, Stobdan T, Khan AP, Norboo T, Afrin F, Qadar Pasha MA. Predominance of interaction among wild-type alleles of CYP11B2 in Himalayan natives associates with high-altitude adaptation. Biochem Biophys Res Commun 2006; 348:735-40. [PMID: 16893516 DOI: 10.1016/j.bbrc.2006.07.116] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2006] [Accepted: 07/21/2006] [Indexed: 10/24/2022]
Abstract
Sojourners visiting high-altitude (HA) (>2500 m) are susceptible to HA disorders; on the contrary, HA natives are well adapted to the extreme hypoxic environment. High aldosterone levels are believed to be involved in HA disorders, we, therefore, envisaged role of CYP11B2 gene variants in HA adaptation and therefore investigated the -344T/C, intron-2 conversion (Iw/Ic), K173R, and A5160C polymorphisms. In addition, polymorphisms in AGT, AT1R, ATP1A1, ADRB2, and GSTP1 genes were also investigated. The study comprised of 662 subjects, comprising of 426 Himalayan highlanders (HLs) and 236 lowlanders (LLs). The -344T/C and K173R polymorphisms were found to be in complete linkage disequilibrium. The wild-type allele -344T and combination of wild-type homozygous genotypes between -344T/C, Iw/Ic, and A5160C polymorphisms, containing all the six wild-type alleles were over-represented in the HLs (p < 0.0001, and p = 0.008, respectively). The wild-type haplotypes -344T-Iw, -344T-5160A, and -344T-Iw-5160A also showed over-representation in the HLs (p < 0.0001). Furthermore, greater the number of wild-type alleles, lower was the ARR (p < 0.05). The genotype distribution in remaining genes did not differ. To conclude, the over-representation of wild-type -344T allele, genotype combinations and haplotypes of CYP11B2, and their correlation with lower aldosterone levels associate with HA adaptation in the HLs. Such an allelic presentation in sojourners may help them cope with adverse HA environment.
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Affiliation(s)
- Charu Rajput
- Institute of Genomics and Integrative Biology, Delhi 110 007, India
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Rajput C, Najib S, Norboo T, Afrin F, Qadar Pasha MA. Endothelin-1 gene variants and levels associate with adaptation to hypobaric hypoxia in high-altitude natives. Biochem Biophys Res Commun 2006; 341:1218-24. [PMID: 16466695 DOI: 10.1016/j.bbrc.2006.01.086] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2006] [Accepted: 01/20/2006] [Indexed: 12/31/2022]
Abstract
High-altitude natives are adapted to hypobaric hypoxia, suggestive of genetic basis of adaptation. Since endothelin-1 (ET-1) is of prime importance in high-altitude disorders in sojourners, we envisaged the role of allelic variants of ET-1 in high-altitude adaptation. Four ET-1 polymorphisms, viz., (CT)(n)-(CA)(n) repeat, -3A/-4A, G2288T, and Lys198Asn, were investigated in 426 highlanders (HLs) and 236 lowlanders (LLs). The plasma ET-1 levels, SBP and BMI were significantly lower in the HLs than those in LLs (p<0.0001). The Longer-repeats (31-45), G allele, Longer-repeats/GG, and Longer-repeats/Lys198Lys combinations were overrepresented in the HLs (p<0.0001, p=0.03, p<0.0001, and p<0.0001, respectively). The Longer-repeats, -3A/-3A, GG and Lys198Lys genotypes associated with significantly lower ET-1 levels in the HLs (p<0.0001, p=0.001, p<0.0001, and p<0.0001, respectively). Combinations of Longer-repeats with -3A/-3A, GG, and Lys198Lys genotypes, and -3A/-3A/Lys198Lys combination revealed association with lower ET-1 levels in the HLs (p<0.001). The study reports over-representation of Longer-repeats, G allele, and wild-type genotype combinations in high-altitude natives. Interaction between these alleles and association with lower ET-1 levels strengthen their association with high-altitude adaptation. Presence of such alleles in sojourners may help in acclimatization.
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Affiliation(s)
- Charu Rajput
- Institute of Genomics and Integrative Biology, Delhi-110 007, India; Centre for Biotechnology, Hamdard University, New Delhi-110 062, India
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Rajput C, Makhijani K, Norboo T, Afrin F, Sharma M, Pasha ST, Pasha MAQ. CYP11B2 gene polymorphisms and hypertension in highlanders accustomed to high salt intake. J Hypertens 2005; 23:79-86. [PMID: 15643128 DOI: 10.1097/00004872-200501000-00016] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND High salt intake is the main determinant of hypertension. The alleles, which once had adaptive value in the salt-poor environment, by promoting salt retention, now induce hypertension. It would be interesting to determine whether the variant alleles of the aldosterone synthase gene (CYP11B2), if related to exaggerated expression/altered activity, are associated with hypertension when combined with a salt-rich diet. OBJECTIVE To investigate the -344T/C, K173R and intron-2 conversion polymorphisms of CYP11B2 for an association with hypertension in highlanders accustomed to a high salt intake. DESIGN AND METHODS Three CYP11B2 polymorphisms were compared with respect to frequencies and clinical characteristics in 190 normotensive highlanders (NHLs) and 100 hypertensive highlanders (HHLs). One-way ANOVA, chi2 test and logistic regression analysis were carried out to investigate the association of these polymorphisms with hypertension. RESULTS The HHLs had significantly higher systolic blood pressure (SBP), diastolic blood pressure (DBP) (P < 0.0001), body mass index (BMI) (P = 0.0002), plasma aldosterone levels (P = 0.03) and aldosterone to plasma renin ratio (ARR) (P < 0.0001) and lower plasma renin activity (PRA) (P = 0.007). The -344T/C and K173R polymorphisms were in complete linkage disequilibrium with each other and the intron-2 conversion allele was in absolute association with the T allele. The TC/CC genotypes correlated with higher BMI when compared with TT genotype in the NHLs and the HHLs (P = 0.002 and 0.004, respectively). The intron-2 conversion heterozygotes/homozygotes correlated with higher SBP in the HHLs (P = 0.03) and significantly higher ARR when compared to IwIw (P = 0.02). Genotype combinations between the -344T/C and intron-2 conversion polymorphisms revealed that combinations with TC or CC genotypes inclined towards higher BMI in both the groups (P < 0.05). CONCLUSIONS Our findings showed a correlation of C allele with high BMI, suggesting that -344T/C polymorphism is in linkage disequilibrium with a functional polymorphism on the adjacent 11-beta hydroxylase gene. The correlation of the intron-2 conversion allele with high SBP and ARR associates it with hypertension. The intron-2 conversion could be a functional variant, since it has been suggested to lead to overexpression of the gene; however, the presence of another functional variant in linkage disequilibrium within the gene cannot be ruled out.
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Affiliation(s)
- Charu Rajput
- Institute of Genomics and Integrative Biology, Delhi, India
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