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Abstract
With sleep occupying up to one-third of every adult's life, addressing sleep is essential to overall health. Sleep disturbance and deficiency are common in patients with chronic lung diseases and associated with worse clinical outcomes and poor quality of life. A detailed history incorporating nocturnal respiratory symptoms, symptoms of obstructive sleep apnea (OSA) and restless legs syndrome, symptoms of anxiety and depression, and medications is the first step in identifying and addressing the multiple factors often contributing to sleep deficiency in chronic lung disease. Additional research is needed to better understand the relationship between sleep deficiency and the spectrum of chronic lung diseases.
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Gondim FDL, Moura MF, Ferreira RM, Serra DS, Araújo RS, Oliveira MLMD, Cavalcante FSÁ. Exposure to total particulate matter obtained from combustion of diesel vehicles (EURO 3 and EURO 5): Effects on the respiratory systems of emphysematous mice. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2021; 83:103583. [PMID: 33434645 DOI: 10.1016/j.etap.2021.103583] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 10/16/2020] [Accepted: 01/06/2021] [Indexed: 06/12/2023]
Abstract
Air pollution has association with chronic obstructive pulmonary disease (COPD) and reduced life expectancy. This study investigated the deleterious effects caused by tobacco smoke and diesel exhaust particles (DEP) from vehicles operating under EURO 3 and EURO 5 standards. Experiments were carried out on C57BL/6 mice divided into six groups: control group, group exposed to cigarette smoke (CS), two groups exposed to DEP (AAE3 and AAE5), and two groups exposed to tobacco smoke and vehicle DEP (CSE3 and CSE5). Results showed that, when compared to AA, groups AAE3 and AAE5 showed changes in respiratory mechanics, and that DEP originating from EURO 5 diesel vehicles was less harmful when compared to DEP originating from EURO 3 diesel vehicles. Analyses of groups CSE3 and CSE5 revealed increased inspiratory capacity and decreased tissue elastance, when compared to their respective controls, suggesting an exacerbation of changes in respiratory system mechanics compatible with COPD development.
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Pai AC, Parekh KR, Engelhardt JF, Lynch TJ. Ferret respiratory disease models for the study of lung stem cells. LUNG STEM CELLS IN DEVELOPMENT, HEALTH AND DISEASE 2021:273-289. [DOI: 10.1183/2312508x.10010320] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
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Karim HMR, Esquinas AM, Ziatabar S, Insalaco G, Skoczyński S, Šarc I, Ferini-Strambi L, Özyiğit LP, Hernández-Gilsoul T, Singha SK, Ciobanu L, Gutiérrez JLS, Szkulmowski Z, Piervincenzi E, Aguiar M, El-Khatib MF, Corcione N, Kaya AG, Çiledağ A, Kaya A, Valli G, Pierucci P, Resta O, Steiropoulos P, De Marco F, Caldeira V, Mina BA. Continuous Positive Airway Pressure (CPAP) in Non-Apneic Asthma: A Clinical Review of Current Evidence. Turk Thorac J 2020; 21:274-279. [PMID: 32687789 DOI: 10.5152/turkthoracj.2019.19049] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Accepted: 06/10/2019] [Indexed: 11/22/2022]
Abstract
The use of continuous positive airway pressure (CPAP) in asthma has been a point of debate over the past several years. Various studies, including those on animals and humans have attempted to understand the role and pathophysiology of CPAP in patients with either well controlled or poorly controlled asthma. The aim of this manuscript is to review the currently available literature on the physiologic and clinical effects of CPAP in animal models of asthma and on humans with stable asthma.
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Affiliation(s)
| | - Antonio M Esquinas
- Department of Intensive Care Unit, Hospital General University Morales Meseguer, Murcia, Spain
| | - Sally Ziatabar
- Department of Internal Medicine, Northwell Health - Lenox Hill Hospital, New York, USA
| | - Giuseppe Insalaco
- Institute of Biomedicine and Molecular Immunology, Italian National Research Council, Palermo, Italy
| | - Szymon Skoczyński
- Department of Pulmonology, Medical University of Silesia, Katowice, Poland
| | - Irena Šarc
- Department for Noninvasive Ventilation, University Clinic of Respiratory and Allergic Diseases, Golnik, Slovenia
| | | | - Leyla Pur Özyiğit
- Department of Respiratory Medicine, Allergy and Immunology, Koç University Hospital, İstanbul, Turkey
| | | | - Subrata Kumar Singha
- Department of Anesthesiology and Critical Care, All India Institute of Medical Sciences, Raipur, India
| | - Laura Ciobanu
- Department of Internal Medicine and Pulmonology, Clinical Hospital of Rehabilitation Lasi, Lasi, Romania
| | - José Luis Sandoval Gutiérrez
- Department of Pulmonary and Critical Care, Instituto Nacional de Enfermedades Respiratorias, México City, Mexico
| | - Zbigniew Szkulmowski
- Department of Anesthesia and Intensive Care Unit, University Hospital No 1 In Bydgoszcz Collegium Medicum in Bydgoszcz University Nicolaus Copernicus in Torun, Bydgoszcz, Poland
| | - Edoardo Piervincenzi
- Department of Anesthesia and Intensive Carei, Sapienza University of Rome, Rome, Italy
| | - Margarida Aguiar
- Department of Pulmonology, Hospital Beatriz Angelo, Lisbon, Portugal
| | - Mohamad F El-Khatib
- Department of Anesthesiology, American University of Beirut, Beirut, Lebanon
| | - Nadia Corcione
- Department of Anesthesia, Critical Care and Emergency Medicine, Fondazione IRCCS Ca' Granda Ospedale Maggiore Policlinico, Milan, Italy
| | - Aslıhan Gürün Kaya
- Department of Chest Diseases, Ankara University School of Medicine, Ankara, Turkey
| | - Aydın Çiledağ
- Department of Chest Diseases, Ankara University School of Medicine, Ankara, Turkey
| | - Akın Kaya
- Department of Chest Diseases, Ankara University School of Medicine, Ankara, Turkey
| | - Gabriele Valli
- Department of Emergency Medicine, Azienda Ospedaliera San Giovanni Addolorata, Rome, Italy
| | - Paola Pierucci
- Department of Cardiothoracic, Respiratory and Sleep Medicine, Policlinico University Hospital, Bari, Italy
| | - Onofrio Resta
- Department of Cardiothoracic, Respiratory and Sleep Medicine, Policlinico University Hospital, Bari, Italy
| | | | | | - Vania Caldeira
- Department of Pulmonology, Hospital de Santa Marta-Centro Hospital, Lisboa, Portugal
| | - Bushra A Mina
- Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Northwell Health - Lenox Hill Hospital, New York, USA
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Serra DS, de Souza KCL, Naidu ST, de Lima JR, de Lima Gondim F, Gomes MDM, Araújo RDS, de Oliveira MLM, Cavalcante FSÁ. Lung injury caused by exposure to the gaseous fraction of exhaust from biomass combustion (cashew nut shells): a mice model. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:9568-9581. [PMID: 31919820 DOI: 10.1007/s11356-019-07576-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 12/29/2019] [Indexed: 06/10/2023]
Abstract
Currently, to reduce the use of nonrenewable energy sources in energy matrices, some industries have already incorporated biomass as a source of energy for their processes. Additionally, filters are used in an attempt to retain the particulate matter present in exhaust gases. In this work, the emission gases of a cashew nut shell (CNS) combustion reactor and the deleterious effects on the respiratory system of mice exposed to gaseous fraction present in CNS emissions (GF-CNS) are analyzed. The system for CNS combustion is composed of a cylindrical stainless steel burner, and exhaust gases generated by CNS combustion were directed through a chimney to a system containing two glass fiber filters to retain all the PM present in the CNS exhaust and, posteriorly, were directed to a mice exposure chamber. The results show changes in the variables of respiratory system mechanics (G, H, CST, IC, and PV loop area) in oxidative stress (SOD, CAT, and NO2-), as well as in the histopathological analysis and lung morphometry (alveolar collapse, PMN cells, mean alveolar diameter, and BCI). Through our results, it has been demonstrated that even with the use of filters by industries for particulate material retention, special attention should still be given to the gaseous fraction that is released into the environment.
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Affiliation(s)
- Daniel Silveira Serra
- Science and Technology Center, State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, 60714-903, Brazil.
| | | | | | - Jéssica Rocha de Lima
- Department of Chemistry and Environment, Federal Institute of Ceará, Fortaleza, CE, Brazil
| | | | | | | | - Mona Lisa Moura de Oliveira
- Science and Technology Center, State University of Ceará, Av. Dr. Silas Munguba, 1700, Fortaleza, CE, 60714-903, Brazil
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Serra DS, Araujo RS, Oliveira MLM, Cavalcante FSA, Leal-Cardoso JH. Lung injury caused by occupational exposure to particles from the industrial combustion of cashew nut shells: a mice model. ARCHIVES OF ENVIRONMENTAL & OCCUPATIONAL HEALTH 2020; 76:1-11. [PMID: 32048551 DOI: 10.1080/19338244.2020.1726269] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Cashew nut shells (CNS) is already used in the energy matrix of some industries. However, it is necessary to know the harmful health effects generated by exposure to pollutants of its combustion, especially in the workers exposed to industrial pollutants. In addition, it is known that the incidence of asthma grows among workers in industries, and due to its previously reported biological effects of anethole, these will also be objects of the present study. We used 64 Balb/C mice, randomly divided into eight groups. Groups were sensitized and challenged with saline or ovalbumin, then subjected to intranasal instillation of 30 µg PM4.0 (occupational exposure) from the combustion of CNS or saline, and then were subsequently treated with oral anethole 300 mg/kg or 0.1% Tween 80. Our results serve as a starting point for the development of public policies for the prevention of diseases in workers that are exposed to the pollutants coming from industries.
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Affiliation(s)
- D S Serra
- Science and Technology Center, State University of Ceará, Fortaleza-Ceará, Brazil
| | - R S Araujo
- Department of Chemistry and Environment, Federal Institute of Ceará, Ceará, Brazil
| | - M L M Oliveira
- Science and Technology Center, State University of Ceará, Fortaleza-Ceará, Brazil
| | - F S A Cavalcante
- Science and Technology Center, State University of Ceará, Fortaleza-Ceará, Brazil
| | - J H Leal-Cardoso
- Ceará, Institute of Biomedical Sciences State University of Ceará, Ceará, Brazil
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The Effect of Extended Continuous Positive Airway Pressure on Changes in Lung Volumes in Stable Premature Infants: A Randomized Controlled Trial. J Pediatr 2020; 217:66-72.e1. [PMID: 31519441 PMCID: PMC7986570 DOI: 10.1016/j.jpeds.2019.07.074] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 07/25/2019] [Accepted: 07/29/2019] [Indexed: 11/21/2022]
Abstract
OBJECTIVE To compare changes in lung volumes, as measured by functional residual capacity (FRC), through to discharge in stable infants randomized to 2 weeks of extended continuous positive airway pressure CPAP (eCPAP) vs CPAP discontinuation (dCPAP). STUDY DESIGN Infants born at ≤32 weeks of gestation requiring ≥24 hours of CPAP were randomized to 2 weeks of eCPAP vs dCPAP when meeting CPAP stability criteria. FRC was measured with the nitrogen washout technique. Infants were stratified by gestational age (<28 and ≥ 28 weeks) and twin gestation. A linear mixed-effects model was used to evaluate the change in FRC between the 2 groups. Data were analyzed blinded to treatment group allocation. RESULTS Fifty infants were randomized with 6 excluded, for a total of 44 infants. Baseline characteristics were similar in the 2 groups. The infants randomized to eCPAP vs dCPAP had a greater increase in FRC from randomization through 2 weeks (12.6 mL vs 6.4 mL; adjusted 95% CI, 0.78-13.47; P = .03) and from randomization through discharge (27.2 mL vs 17.1 mL; adjusted 95% CI, 2.61-17.59; P = .01). CONCLUSIONS Premature infants randomized to eCPAP had a significantly greater increase in FRC through discharge compared with those randomized to dCPAP. An increased change in FRC may lead to improved respiratory health. TRIAL REGISTRATION ClinicalTrials.gov: NCT02249143.
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Adrish M, Roa Gomez G, Cancio Rodriguez E, Mantri N. Influence of HIV status on the management of acute asthma exacerbations. BMJ Open Respir Res 2019; 6:e000472. [PMID: 31908787 PMCID: PMC6937028 DOI: 10.1136/bmjresp-2019-000472] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Revised: 10/31/2019] [Accepted: 12/05/2019] [Indexed: 11/04/2022] Open
Abstract
Background An increased incidence of asthma has been suggested in patients with HIV. We aimed to compare the outcomes of HIV-positive and HIV-negative patients following hospital admission for asthma exacerbation. Methods A retrospective chart review of patients hospitalised between January 2015 and December 2017 owing to asthma exacerbation with a known HIV status was conducted. Results During the study period, 1242 patients with asthma were admitted. Of these, 462 patients had a known HIV status (358 HIV-negative, 104 HIV-positive) and were included. No differences in baseline demographics, including age, sex, body mass index and underlying comorbid conditions, were identified between the groups except that HIV-negative patients had higher incidence of underlying congestive heart failure. HIV-positive group had a significantly higher serum creatinine levels (1.117 (1.390) vs 0.813 (0.509), p=0.001), higher serum eosinophil levels (492.91 (1789.09) vs 243.70 (338.66), p=0.013) but had lower serum neutrophils (5.74 (3.18) vs 7.194 (3.59), p=0.0002) and lower serum albumin levels (3.754 (0.480) vs 3.94 (0.443), p=0.003) than the HIV-negative group, respectively. Non-invasive positive pressure ventilation (NIPPV) use was more frequent (54.8% vs 25.4%, p≤0.001) and the length of in-hospital stay (LOS) was longer in HIV-positive vs HIV-negative patients (3.346 days vs 2.813 days, p=0.015); no differences in mechanical ventilation use or intensive care unit admission were noted between the groups. In a subgroup analysis comparing HIV-negative with HIV-positive patients stratified by CD4 count, NIPPV use was more frequent and the LOS was longer in HIV-positive patients with CD4 counts≥200 cellsx 10∧6/L. In a multivariable regression model, HIV-positive status was independently associated with NIPPV use (OR 2.52; 95% CI 1.43 to 4.46) and a 0.55 day (95% CI 0.02 to 1.08) longer LOS in hospital. Conclusions HIV-positive patients admitted with asthma exacerbation are more likely to require NIPPV and have longer LOS.
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Affiliation(s)
- Muhammad Adrish
- Clinical Assistant Professor, Medicine, BronxCare Hospital Center, Affiliated with Icahn School of Medicine at Mount Sinai, NY, USA, Bronx, New York, USA
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Gondim FDL, Serra DS, Cavalcante FSÁ. Effects of Eucalyptol in respiratory system mechanics on acute lung injury after exposure to short-term cigarette smoke. Respir Physiol Neurobiol 2019; 266:33-38. [DOI: 10.1016/j.resp.2019.04.007] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2019] [Revised: 04/09/2019] [Accepted: 04/18/2019] [Indexed: 11/25/2022]
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Praca E, Jalou H, Krupp N, Delecaris A, Hatch J, Slaven J, Gunst SJ, Tepper RS. Effect of CPAP on airway reactivity and airway inflammation in children with moderate-severe asthma. Respirology 2019; 24:338-344. [PMID: 30444283 PMCID: PMC6743322 DOI: 10.1111/resp.13441] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 10/05/2018] [Accepted: 10/23/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND OBJECTIVE Asthma is characterized by airway hyperreactivity and airway inflammation. We previously demonstrated that adults with mild well-controlled asthma exhibited a marked decrease in airway reactivity (PC20 increased >2-fold) after using nocturnal continuous positive airway pressure (CPAP) for 1 week. If CPAP produces a similar suppression of airway reactivity in children with moderate-severe asthma, who require chronic use of corticosteroids, then this non-pharmacological therapy might provide a beneficial alternative or supplemental therapy in these subjects. METHODS Children aged 8-17 years with moderate-severe asthma were treated with 4 weeks of nocturnal CPAP (8-10 cm H2 O) or sham CPAP (<2 cm H2 O). Adherence was monitored with a modem installed in the equipment or by memory cards. Airway reactivity, assessed by methacholine bronchial challenge, was measured prior to and following treatment. RESULTS The percentage of subjects adherent to treatment was similar in both groups (19/27 CPAP vs 19/28 sham, ~70%). There was a tendency for PC20 to increase with treatment in both groups (3.0-5.3 mg/mL CPAP vs 3.2 to 4.3 mg/mL sham, P = 0.083); however, the change did not differ significantly between groups (P = 0.569). CONCLUSION We found that the 4-week treatment with nocturnal CPAP did not produce a twofold suppression of airway reactivity in children with moderate-severe asthma.
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Affiliation(s)
- Eduardo Praca
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Hasnaa Jalou
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Nadia Krupp
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Angela Delecaris
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Joseph Hatch
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
| | - James Slaven
- Department of Biostatistics, Indiana University Schools of Medicine and Public Health, Indianapolis, IN, USA
| | - Susan J Gunst
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, IN, USA
| | - Robert S Tepper
- Department of Pediatrics, Division of Pulmonology, James Whitcomb Riley Hospital for Children, Indiana University School of Medicine, Indianapolis, IN, USA
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Serra DS, Gomes MDM, Cavalcante FSÁ, Leal-Cardoso JH. Essential oil of Croton Zehntneri attenuates lung injury in the OVA-induced asthma model. J Asthma 2018; 56:1-10. [PMID: 29437496 DOI: 10.1080/02770903.2018.1430828] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE Croton zehntneri Pax et Hoffm. is a Euphorbiaceae species, popularly known as "canela de cunhã," a native plant of northeastern Brazil, whose essential oil (EOCZ) shows relatively specific myorelaxant action for the smooth muscle of the airways and in the respiratory tract. Based on this information, EOCZ figures as a candidate for testing in the treatment of asthma, and the present study investigated the benefits of using EOCZ in an ovalbumin-induced asthma model. METHODS 48 male BALB/c mice were divided into six groups (n = 8). In the ST, SO100, and SO300 groups, mice were sensitized and challenged with saline, and then treated with 200 µL of 0.1% Tween 80, 100 mg/kg EOCZ and 300 mg/kg EOCZ, respectively. In the OT, OO100, and OO300 groups, mice were sensitized and challenged with OVA, and then treated with 200 µL of 0.1% Tween 80, 100 mg/kg EOCZ and 300 mg/kg EOCZ, respectively. RESULTS Our results demonstrated significant changes in all respiratory mechanics variables analyzed between the OO300 and OT groups demonstrating the effectiveness of EOCZ to attenuate the OVA-induced lung injury. In addition, the use of EOCZ at a dose of 300 mg/kg showed an antioxidant effect and decreased inflammatory cells in the pulmonary parenchyma. In conclusion, our results demonstrated that EOCZ was able to improve the lesion in the respiratory system of mice subjected to OVA-induced asthma. CONCLUSIONS The antioxidant action of EOCZ was likely the main mechanism of action in the reversal of this lesion, so more tests should be performed for its confirmation.
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Affiliation(s)
- Daniel Silveira Serra
- a Institute of Biomedical Sciences , State University of Ceará , Fortaleza , Ceará , Brazil
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Effect of Continuous Positive Airway Pressure on Airway Reactivity in Asthma. A Randomized, Sham-controlled Clinical Trial. Ann Am Thorac Soc 2017; 13:1940-1950. [PMID: 27398992 DOI: 10.1513/annalsats.201601-043oc] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
RATIONALE Studies have demonstrated that application of stress suppresses airway smooth muscle contractility. In animal models of asthma, continuous positive airway pressure (CPAP) reduced airway reactivity. Short-term studies of CPAP in patients with asthma showed reductions in airway reactivity. OBJECTIVES To evaluate whether nocturnal CPAP decreased the provocative concentration of methacholine to reduce FEV1 by 20% (PC20). METHODS One hundred ninety-four individuals with asthma were randomized (1:1:1) to use CPAP with warmed, filtered, humidified air at night at pressures either less than 1 cm H2O (sham) or at 5 cm H2O or 10 cm H2O. The primary outcome was change in PC20 after 12 weeks. MEASUREMENTS AND MAIN RESULTS Adherence to CPAP was low in all groups. Regardless, all groups had a significant improvement in PC20, with 12 weeks/baseline PC20 ratios of 2.12, 1.73, and 1.78 for the sham, 5 cm H2O, and 10 cm H2O groups, respectively, and no significant differences between the active and sham groups. Changes in FEV1 and exhaled nitric oxide were minimal in all groups. The sham group had larger improvements in most patient-reported outcomes measuring asthma symptoms and quality of life, as well as sinus symptoms, than the 5 cm H2O group. The 10 cm H2O group showed similar but less consistent improvements in scores, which were not different from improvements in the sham group. CONCLUSIONS Adherence to nocturnal CPAP was low. There was no evidence to support positive pressure as being effective for reducing airway reactivity in people with well-controlled asthma. Regardless, airway reactivity was improved in all groups, which may represent an effect of participating in a study and/or an effect of warm, humid, filtered air on airway reactivity. Clinical trial registered with www.clinicaltrials.gov (NCT01629823).
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Rogers L. Role of Sleep Apnea and Gastroesophageal Reflux in Severe Asthma. Immunol Allergy Clin North Am 2017; 36:461-71. [PMID: 27401619 DOI: 10.1016/j.iac.2016.03.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Gastroesophageal reflux and obstructive sleep apnea syndrome are conditions that practitioners have been encouraged to evaluate and treat as part of a comprehensive approach to achieving asthma control. In this review, the author looks at the evidence linking these two conditions as factors that may impact difficult-to-control asthma and looks critically at the evidence suggesting that evaluation and treatment of these conditions when present impacts asthma control.
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Affiliation(s)
- Linda Rogers
- Department of Medicine, Mount Sinai-National Jewish Health Respiratory Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, Box 1232, New York, NY 10029, USA.
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Josino JB, Serra DS, Gomes MDM, Araújo RS, de Oliveira MLM, Cavalcante FSÁ. Changes of respiratory system in mice exposed to PM 4.0 or TSP from exhaust gases of combustion of cashew nut shell. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2017; 56:1-9. [PMID: 28858710 DOI: 10.1016/j.etap.2017.08.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2017] [Revised: 08/20/2017] [Accepted: 08/21/2017] [Indexed: 06/07/2023]
Abstract
Air pollution is a topic discussed all over the world and the search for alternatives to reduce it is of great interest to many researchers. The use of alternative energy sources and biofuels seems to be the environmentally safer solution. In this work, the deleterious effects on the respiratory system of mice exposed to PM4.0 or TSP, present in exhaust gases from the combustion of CNS were investigated, through data from respiratory system mechanics, oxidative stress, histopathology and morphometry of the parenchyma pulmonary. The results show changes in all variables of respiratory system mechanics, in oxidative stress, the histopathological analysis and lung morphometry. The results provide experimental support for epidemiological observations of association between effects on the respiratory system and exposure to PM4.0 or TSP from CNS combustion exhaust gases, even at acute exposure. It can serve as a basis for regulation or adjustment of environmental laws that control the emissions of these gases.
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Serra DS, Evangelista JSAM, Zin WA, Leal-Cardoso JH, Cavalcante FSÁ. Changes in rat respiratory system produced by exposure to exhaust gases of combustion of glycerol. Respir Physiol Neurobiol 2017; 242:80-85. [DOI: 10.1016/j.resp.2017.04.001] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/31/2017] [Accepted: 04/01/2017] [Indexed: 11/30/2022]
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Oliveira Neto JD, Silveira JADM, Serra DS, Viana DDA, Borges-Nojosa DM, Sampaio CMS, Monteiro HSA, Cavalcante FSÁ, Evangelista JSAM. Pulmonary mechanic and lung histology induced by Crotalus durissus cascavella snake venom. Toxicon 2017; 137:144-149. [PMID: 28760509 DOI: 10.1016/j.toxicon.2017.07.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2016] [Revised: 07/23/2017] [Accepted: 07/26/2017] [Indexed: 10/19/2022]
Abstract
This study have analyzed the pulmonary function in an experimental model of acute lung injury, induced by the Crotalus durissus cascavella venom (C. d. cascavella) (3.0 μg/kg - i.p), in pulmonary mechanic and histology at 1 h, 3 h, 6 h, 12 h and 24 h after inoculation. The C. d. cascavella venom led to an increase in Newtonian Resistance (RN), Tissue Resistance (G) and Tissue Elastance (H) in all groups when compared to the control, particularly at 12 h and 24 h. The Histeresivity (η) increased 6 h, 12 h and 24 h after inoculation. There was a decrease in Static Compliance (CST) at 6 h, 12 h and 24 h and inspiratory capacity (IC) at 3 h, 6 h, 12 h and 24 h. C. d. cascavella venom showed significant morphological changes such as atelectasis, emphysema, hemorrhage, polymorphonuclear inflammatory infiltrate, edema and congestion. After a challenge with methacholine (MCh), RN demonstrated significant changes at 6, 12 and 24 h. This venom caused mechanical and histopathological changes in the lung tissue; however, its mechanisms of action need further studies in order to better elucidate the morphofunctional lesions.
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Affiliation(s)
- Joselito de Oliveira Neto
- Postgraduate Program in Veterinary Sciences, Faculty of Veterinary, State University of Ceará, Fortaleza, Ceará, Brazil.
| | | | - Daniel Silveira Serra
- Postgraduate Program in Physics, State University of Ceará, Fortaleza, Ceará, Brazil
| | - Daniel de Araújo Viana
- Postgraduate Program in Veterinary Sciences, Faculty of Veterinary, State University of Ceará, Fortaleza, Ceará, Brazil
| | | | | | - Helena Serra Azul Monteiro
- Department of Physiology and Pharmacology, Faculty of Medicine, Federal University of Ceará, Fortaleza, Ceará, Brazil
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Ansell TK, McFawn PK, McLaughlin RA, Sampson DD, Eastwood PR, Hillman DR, Mitchell HW, Noble PB. Does smooth muscle in an intact airway undergo length adaptation during a sustained change in transmural pressure? J Appl Physiol (1985) 2015; 118:533-43. [DOI: 10.1152/japplphysiol.00724.2014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
In isolated airway smooth muscle (ASM) strips, an increase or decrease in ASM length away from its current optimum length causes an immediate reduction in force production followed by a gradual time-dependent recovery in force, a phenomenon termed length adaptation. In situ, length adaptation may be initiated by a change in transmural pressure (Ptm), which is a primary physiological determinant of ASM length. The present study sought to determine the effect of sustained changes in Ptm and therefore, ASM perimeter, on airway function. We measured contractile responses in whole porcine bronchial segments in vitro before and after a sustained inflation from a baseline Ptm of 5 cmH2O to 25 cmH2O, or deflation to −5 cmH2O, for ∼50 min in each case. In one group of airways, lumen narrowing and stiffening in response to electrical field stimulation (EFS) were assessed from volume and pressure signals using a servo-controlled syringe pump with pressure feedback. In a second group of airways, lumen narrowing and the perimeter of the ASM in situ were determined by anatomical optical coherence tomography. In a third group of airways, active tension was determined under isovolumic conditions. Both inflation and deflation reduced the contractile response to EFS. Sustained Ptm change resulted in a further decrease in contractile response, which returned to baseline levels upon return to the baseline Ptm. These findings reaffirm the importance of Ptm in regulating airway narrowing. However, they do not support a role for ASM length adaptation in situ under physiological levels of ASM lengthening and shortening.
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Affiliation(s)
- Thomas K. Ansell
- School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
- School of Veterinary and Life Sciences, Murdoch University, Murdoch, Western Australia, Australia
| | - Peter K. McFawn
- School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
| | - Robert A. McLaughlin
- Optical+Biomedical Engineering Laboratory, School of Electrical, Electronic and Computer Engineering, University of Western Australia, Crawley, Western Australia, Australia
| | - David D. Sampson
- Optical+Biomedical Engineering Laboratory, School of Electrical, Electronic and Computer Engineering, University of Western Australia, Crawley, Western Australia, Australia
- Centre for Microscopy, Characterisation and Analysis, University of Western Australia, Crawley, Western Australia, Australia
| | - Peter R. Eastwood
- School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
- West Australian Sleep Disorders Research Institute, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia; and
| | - David R. Hillman
- West Australian Sleep Disorders Research Institute, Sir Charles Gairdner Hospital, Nedlands, Western Australia, Australia; and
| | - Howard W. Mitchell
- School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
| | - Peter B. Noble
- School of Anatomy, Physiology and Human Biology, University of Western Australia, Crawley, Western Australia, Australia
- Centre for Neonatal Research and Education, School of Paediatrics and Child Health, University of Western Australia, Crawley, Western Australia, Australia
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18
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Wang L, Paré PD, Seow CY. The importance of complete tissue homogenization for accurate stoichiometric measurement of myosin light chain phosphorylation in airway smooth muscle. Can J Physiol Pharmacol 2014; 93:155-62. [PMID: 25494914 DOI: 10.1139/cjpp-2014-0357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The standard method for measuring the phosphorylation of the regulatory myosin light chain (MLC20) in smooth muscle is extraction of the light chain using a urea extraction buffer, urea-glycerol gel electrophoresis of the soluble portion of the extract (supernatant) and Western blot analysis. The undissolved portion of the tissue during extraction (the pellet) is usually discarded. Because the pellet contains a finite amount of MLC20, omission of the pellet could result in inaccurate measurement of MLC20 phosphorylation. In this study we compared the level of tracheal smooth muscle MLC20 phosphorylation in the supernatant alone, with that in the complete tissue homogenate (supernatant and pellet) using the standard method. The supernatant fraction showed the well-known double bands representing phosphorylated and un-phosphorylated MLC20. The dissolved pellet fraction showed varying amounts of un-phosphorylated and phosphorylated MLC20. There was a small but statistically significant overestimation of the percent MLC20 phosphorylation if the pellet was not taken into consideration. The overestimation was 7% ± 2% (mean ± SEM) (p < 0.05) in unstimulated muscle and 2% ± 1% (p < 0.05) in acetylcholine (10(-6) mol/L) stimulated muscle. This finding suggests that for accurate estimation of the stoichiometry of MLC20 phosphorylation it is necessary to consider the contribution from the pellet portion of the muscle tissue homogenate.
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Affiliation(s)
- Lu Wang
- a Respiratory Division, Department of Medicine, Vancouver, BC V5Z 1M9, Canada
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19
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Noninvasive ventilation in acute asthma. J Crit Care 2014; 29:586-93. [PMID: 24735521 DOI: 10.1016/j.jcrc.2014.03.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2013] [Revised: 02/16/2014] [Accepted: 03/11/2014] [Indexed: 01/07/2023]
Abstract
Noninvasive ventilation (NIV) has well-recognized benefits in acute exacerbation of chronic obstructive pulmonary disease and pulmonary edema. Its utilization in acute asthma, however, remains controversial. In this review, we describe the physiological basis to justify NIV use in acute asthma and contribute a critical appraisal of the available literature relating to this practice. A discussion of some of the more pertinent, clinically relevant practicalities is also provided. Original research articles were identified using the electronic PubMed database. Randomized controlled trials of NIV in the setting of acute asthma were selected. Retrospective observational studies were also included if they were considered to contribute to the literature review. The use of NIV in the acute asthma setting has been shown to be associated with improvements in important physiological variables including measures of airflow and respiratory rate, and lends support to further study in this field. Improvements in airflow may be a direct effect of applied positive airway pressure or an indirect effect secondary to better dispersal of aerosolized medication. Reductions observed in respiratory rate and dyspnea are likely influenced by the amount of pressure support provided. Evidence suggestive of any improvement in mortality, intubation rate, or hospital/intensive care unit length of stay, however, is lacking. Studies to date have been hampered by small numbers and a lack of demonstrable meaningful clinical outcomes. Data relating to mortality, endotracheal intubation rates, and hospital length of stay/admission should be sought in future large clinical trials.
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20
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Obstructive sleep apnea and asthma: associations and treatment implications. Sleep Med Rev 2013; 18:165-71. [PMID: 23890469 DOI: 10.1016/j.smrv.2013.04.004] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2013] [Revised: 04/12/2013] [Accepted: 04/24/2013] [Indexed: 12/19/2022]
Abstract
Obstructive sleep apnea (OSA) and asthma are highly prevalent respiratory disorders and are frequently co-morbid. Risk factors common to the two diseases include obesity, rhinitis, and gastroesophageal reflux (GER). Observational and experimental evidence implicates airways and systemic inflammation, neuromechanical effects of recurrent upper airway collapse, and asthma-controlling medications (corticosteroids) as additional explanatory factors. Therefore, undiagnosed or inadequately treated OSA may adversely affect control of asthma and vice versa. It is important for clinicians to be vigilant and specifically address weight-control, nasal obstruction, and GER in these populations. Utilizing validated screening instruments to affirm high risk of co-morbid OSA or asthma in persistently symptomatic patients will allow clinicians to cost-effectively test and treat appropriate patients, potentially improving outcomes. While non-invasive ventilation in acute asthma improves outcomes, the role of chronic continuous positive airway pressure (CPAP; the first-line treatment for OSA) in improving long-term asthma control is not known. Future research should focus on the impact of optimal CPAP therapy and adherence on asthma symptoms and outcomes.
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21
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Rebuttal from Gunst and Panettieri. J Appl Physiol (1985) 2013; 113:842-3. [PMID: 22942221 DOI: 10.1152/japplphysiol.00483.2012b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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22
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Dixon AE, Kaminsky DA. Mechanical strain and airway responsiveness: how long does it take, how long will it last? J Appl Physiol (1985) 2013; 114:1504-5. [PMID: 23558393 DOI: 10.1152/japplphysiol.00421.2013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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23
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Xue Z, Zhang W, Desai LP, Gao H, Gunst SJ, Tepper RS. Increased mechanical strain imposed on murine lungs during ventilation in vivo depresses airway responsiveness and activation of protein kinase Akt. J Appl Physiol (1985) 2013; 114:1506-10. [PMID: 23493362 DOI: 10.1152/japplphysiol.01460.2012] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
Continuous positive airway pressure (CPAP) administered to tracheostomized rabbits and ferrets for 4 days or 2 wk suppresses bronchial reactivity in vivo and suppresses airway reactivity in lobes and tracheal segments isolated from these animals. In vitro studies of canine tracheal smooth muscle tissues indicate that mechanical loading suppresses the activation of the growth regulatory kinase, Akt, and that Akt is a negative regulator of smooth muscle differentiation. The transduction of mechanical signals in the tracheal tissues in vitro is mediated by integrin-associated adhesion complexes. To determine whether airway responsiveness and Akt activation are modulated by mechanical loads applied for short time periods to the airways of living animals in vivo, mice were mechanically ventilated for 2 h with high (5 cmH2O) or low (0-1 cmH2O) positive end-expiratory pressure (PEEP) and then ventilated at low PEEP for 30 min. Ventilation of mice with PEEP in vivo for 2 h depressed airway responsiveness to methacholine measured in vivo subsequent to the PEEP treatment. Airway narrowing in vitro in intraparenchymal airways in isolated lung slices and contractile responses of isolated tracheal segments in vitro were suppressed for at least 6 h subsequent to the in vivo exposure to PEEP. Tracheal segments isolated from high PEEP-treated mice exhibited significantly lower levels of Akt activation than tracheae from low PEEP-treated mice. The results indicate that mechanical loads imposed in vivo result in physiological and biochemical changes in the airway tissues after a relatively short 2-h period of in vivo loading.
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Affiliation(s)
- Z Xue
- Department of Pediatrics Herman B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, USA
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24
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Busk M, Busk N, Puntenney P, Hutchins J, Yu Z, Gunst SJ, Tepper RS. Use of continuous positive airway pressure reduces airway reactivity in adults with asthma. Eur Respir J 2013; 41:317-22. [PMID: 22835615 PMCID: PMC4727535 DOI: 10.1183/09031936.00059712] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Asthma is characterised by airway hyperreactivity, which is primarily treated with β-adrenergic bronchodilators and anti-inflammatory agents. However, mechanical strain during breathing is an important modulator of airway responsiveness and we have previously demonstrated in animal models that continuous positive airway pressure (CPAP) resulted in lower in vivo airway reactivity. We now evaluated whether using nocturnal CPAP decreased airway reactivity in clinically-stable adults with asthma. Adults with stable asthma and normal spirometry used nocturnal CPAP (8-10 cmH(2)O) or sham treatment (0-2 cmH(2)O) for 7 days. Spirometry and bronchial challenges were obtained before and after treatment. The primary outcome was the provocative concentration of methacholine causing a 20% fall in forced expiratory volume in 1 s (PC(20)). The CPAP group (n=16) had a significant decrease in airway reactivity (change in (Δ)logPC(20) 0.406, p<0.0017) while the sham group (n=9) had no significant change in airway reactivity (ΔlogPC(20) 0.003, p=0.9850). There was a significant difference in the change in airway reactivity for the CPAP versus the sham group (ΔlogPC(20) 0.41, p<0.043). Our findings indicate that chronic mechanical strain of the lungs produced using nocturnal CPAP for 7 days reduced airway reactivity in clinically stable asthmatics. Future studies of longer duration are required to determine whether CPAP can also decrease asthma symptoms and/or medication usage.
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Affiliation(s)
- Michael Busk
- Division of Pulmonary, Allergy, Critical Care, Occupational, and Sleep Medicine, Indiana University School of Medicine, Indianapolis, IN, USA
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25
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Doeing DC, Solway J. Airway smooth muscle in the pathophysiology and treatment of asthma. J Appl Physiol (1985) 2013; 114:834-43. [PMID: 23305987 DOI: 10.1152/japplphysiol.00950.2012] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Airway smooth muscle (ASM) plays an integral part in the pathophysiology of asthma. It is responsible for acute bronchoconstriction, which is potentiated by constrictor hyperresponsiveness, impaired relaxation and length adaptation. ASM also contributes to airway remodeling and inflammation in asthma. In light of this, ASM is an important target in the treatment of asthma.
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Affiliation(s)
- Diana C Doeing
- Department of Medicine, University of Chicago, Chicago, IL, USA.
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26
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Asthma clinical trials of American Lung Association/Asthma Clinical Research Centers (ALA-ACRC): what have we learned in 12 years? ACTA ACUST UNITED AC 2012. [DOI: 10.1007/s13665-012-0024-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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27
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Hoover WC, Zhang W, Xue Z, Gao H, Chernoff J, Clapp DW, Gunst SJ, Tepper RS. Inhibition of p21 activated kinase (PAK) reduces airway responsiveness in vivo and in vitro in murine and human airways. PLoS One 2012; 7:e42601. [PMID: 22900031 PMCID: PMC3416806 DOI: 10.1371/journal.pone.0042601] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2012] [Accepted: 07/10/2012] [Indexed: 11/18/2022] Open
Abstract
The p21-activated protein kinases (Paks) have been implicated in the regulation of smooth muscle contractility, but the physiologic effects of Pak activation on airway reactivity in vivo are unknown. A mouse model with a genetic deletion of Pak1 (Pak1(-/-)) was used to determine the role of Pak in the response of the airways in vivo to challenge with inhaled or intravenous acetylcholine (ACh). Pulmonary resistance was measured in anesthetized mechanically ventilated Pak1(-/-) and wild type mice. Pak1(-/-) mice exhibited lower airway reactivity to ACh compared with wild type mice. Tracheal segments dissected from Pak1(-/-) mice and studied in vitro also exhibited reduced responsiveness to ACh compared with tracheas from wild type mice. Morphometric assessment and pulmonary function analysis revealed no differences in the structure of the airways or lung parenchyma, suggesting that that the reduced airway responsiveness did not result from structural abnormalities in the lungs or airways due to Pak1 deletion. Inhalation of the small molecule synthetic Pak1 inhibitor, IPA3, also significantly reduced in vivo airway responsiveness to ACh and 5-hydroxytryptamine (5-Ht) in wild type mice. IPA3 inhibited the contractility of isolated human bronchial tissues to ACh, confirming that this inhibitor is also effective in human airway smooth muscle tissue. The results demonstrate that Pak is a critical component of the contractile activation process in airway smooth muscle, and suggest that Pak inhibition could provide a novel strategy for reducing airway hyperresponsiveness.
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Affiliation(s)
- Wyn C. Hoover
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Wenwu Zhang
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Zhidong Xue
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Huanling Gao
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Jonathan Chernoff
- Fox Chase Cancer Center, Philadelphia, Pennsylvania, United States of America
| | - D. Wade Clapp
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Department of Microbiology and Immunology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Susan J. Gunst
- Department of Cellular and Integrative Physiology, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
| | - Robert S. Tepper
- Department of Pediatrics, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- Herman B Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, United States of America
- * E-mail:
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28
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Abstract
The obese asthma phenotype is an increasingly common encounter in our clinical practice. Epidemiological data indicate that obesity increases the prevalence and incidence of asthma, and evidence that obesity precedes the development of asthma raises the possibility of a causal association. Obese patients with asthma experience more symptoms and increased morbidity compared with non-obese asthma patients. Despite more than a decade of research into this association, the exact mechanisms that underlie the interaction of obesity with asthma remain unclear. It is unlikely that the asthma-obesity association is simply due to comorbidities such as obstructive sleep apnoea or gastroesophageal reflux disease. Although inflammatory pathways are purported to play a role, there is scant direct evidence in humans that systemic inflammation modulates the behaviour of the asthmatic airway or the expression of symptoms in the obese. The role of non-eosinophilic airway inflammation also requires further study. Obesity results in important changes to the mechanical properties of the respiratory system, and these obesity-related factors appear to exert an additive effect to the asthma-related changes seen in the airways. An understanding of the various physiological perturbations that might be contributing to symptoms in obese patients with asthma will allow for a more targeted and rational treatment approach for these patients.
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Affiliation(s)
- Claude S Farah
- The Woolcock Institute of Medical Research, Cooperative Research Centre for Asthma and Airways, Glebe, and The University of Sydney, Sydney, New South Wales, Australia.
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29
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Waters CM, Roan E, Navajas D. Mechanobiology in lung epithelial cells: measurements, perturbations, and responses. Compr Physiol 2012; 2:1-29. [PMID: 23728969 PMCID: PMC4457445 DOI: 10.1002/cphy.c100090] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Epithelial cells of the lung are located at the interface between the environment and the organism and serve many important functions including barrier protection, fluid balance, clearance of particulate, initiation of immune responses, mucus and surfactant production, and repair following injury. Because of the complex structure of the lung and its cyclic deformation during the respiratory cycle, epithelial cells are exposed to continuously varying levels of mechanical stresses. While normal lung function is maintained under these conditions, changes in mechanical stresses can have profound effects on the function of epithelial cells and therefore the function of the organ. In this review, we will describe the types of stresses and strains in the lungs, how these are transmitted, and how these may vary in human disease or animal models. Many approaches have been developed to better understand how cells sense and respond to mechanical stresses, and we will discuss these approaches and how they have been used to study lung epithelial cells in culture. Understanding how cells sense and respond to changes in mechanical stresses will contribute to our understanding of the role of lung epithelial cells during normal function and development and how their function may change in diseases such as acute lung injury, asthma, emphysema, and fibrosis.
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Xue Z, Yu Y, Gao H, Gunst SJ, Tepper RS. Chronic continuous positive airway pressure (CPAP) reduces airway reactivity in vivo in an allergen-induced rabbit model of asthma. J Appl Physiol (1985) 2011; 111:353-7. [PMID: 21493723 DOI: 10.1152/japplphysiol.01345.2010] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Previous studies have demonstrated that chronic mechanical strain produced by continuous positive airway pressure (CPAP) reduces in vivo airway reactivity in rabbits and ferrets. For CPAP to potentially have a therapeutic benefit for asthmatic subjects, the reduction in airway responsiveness would need to persist for 12-24 h after its discontinuation, require application for only part of the day, and be effective in the presence of atopic airway inflammation. In the present study, airway responsiveness to acetylcholine or methacholine was measured during mechanical ventilation following three different protocols in which active, nonanesthetized, tracheotomized rabbits were treated with High vs. Low CPAP (6 vs. 0 cmH(2)O). 1) High CPAP was applied continuously for 4 days followed by 1 day of Low CPAP; 2) High CPAP was applied at night and Low CPAP during the daytime for 4 days, and 3) High CPAP was applied for 4 days in animals following ovalbumin (Ova) sensitization and challenge. For all three protocols, treatment with High CPAP resulted in significantly reduced airway responsiveness compared with treatment with Low CPAP. Cumulatively, our in vivo results in rabbits suggest that high CPAP, even when applied only at night, produces a persistent reduction of airway responsiveness. In addition, CPAP reduces airway responsiveness even in the presence of atopic airway inflammation.
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Affiliation(s)
- Z Xue
- Department of Pediatrics, H. B. Wells Center for Pediatric Research, Indiana University School of Medicine, Indianapolis, Indiana, USA
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31
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Chapman DG, Berend N, King GG, Salome CM. Can we cure airway hyperresponsiveness with a gym membership? J Appl Physiol (1985) 2010; 109:267-8. [DOI: 10.1152/japplphysiol.00582.2010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Affiliation(s)
- David G. Chapman
- Woolcock Institute of Medical Research, Camperdown, New South Sales
- University of Sydney, Sydney; and
| | - Norbert Berend
- Woolcock Institute of Medical Research, Camperdown, New South Sales
- Cooperative Research Centre for Asthma, Camperdown, New South Wales
- University of Sydney, Sydney; and
| | - Gregory G. King
- Woolcock Institute of Medical Research, Camperdown, New South Sales
- Cooperative Research Centre for Asthma, Camperdown, New South Wales
- University of Sydney, Sydney; and
- Department of Respiratory Medicine, Royal North Shore Hospital, St Leonards, New South Wales, Australia
| | - Cheryl M. Salome
- Woolcock Institute of Medical Research, Camperdown, New South Sales
- Cooperative Research Centre for Asthma, Camperdown, New South Wales
- University of Sydney, Sydney; and
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32
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Hasan N, Landsberg DM, Acevedo RA, Sah BP. AIRWAY PRESSURE RELEASE VENTILATION (APRV) IN THE MANAGEMENT OF STATUS ASTHMATICUS. Chest 2009. [DOI: 10.1378/chest.136.4_meetingabstracts.25s-e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022] Open
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33
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Bates JHT. How should airway smooth muscle be punished for causing asthma? J Appl Physiol (1985) 2008; 104:575-6. [PMID: 18174388 DOI: 10.1152/japplphysiol.01365.2007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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