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Bourdin A, Bommart S, Marin G, Vachier I, Gamez AS, Ahmed E, Suehs CM, Molinari N. Obesity in women with asthma: Baseline disadvantage plus greater small-airway responsiveness. Allergy 2023; 78:780-790. [PMID: 36070075 DOI: 10.1111/all.15509] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2022] [Revised: 08/12/2022] [Accepted: 08/15/2022] [Indexed: 11/01/2022]
Abstract
BACKGROUND Obesity is known to diminish lung volumes and worsen asthma. However, mechanistic understanding is lacking, especially as concerns small-airway responsiveness. The objective of this study was therefore to compare small-airway responsiveness, as represented by the change in expiratory:inspiratory mean lung density ratios (MLDe/i , as determined by computed tomography [CT]) throughout methacholine testing in obese versus non-obese women with asthma. METHODS Thoracic CT was performed during methacholine bronchoconstriction challenges to produce standardized response curves (SRC: response parameter versus ln[1 + % PD20], where PD20 is the cumulative methacholine dose) for 31 asthma patients (n = 18 non-obese and n = 13 obese patients). Mixed models evaluated obesity effects and interactions on SRCs while adjusting for age and bronchial morphology. Small airway responsiveness as represented by SRC slope was calculated for each third of the MLDe/i response and compared between groups. RESULTS Obesity-associated effects observed during experimental bronchoconstriction included: (i) a significant baseline effect for forced expiratory volume in 1 second with lower values for the obese (73.11 ± 13.44) versus non-obese (82.19 ± 8.78; p = 0.002) groups prior to methacholine testing and (ii) significantly higher responsiveness in small airways as estimated via differences in MLDe/i slopes (group×ln(1 + % PD20 interaction; p = 0.023). The latter were pinpointed to higher slopes in the obese group at the beginning 2/3 of SRCs (p = 0.004 and p = 0.021). Significant obesity effects (p = 0.035 and p = 0.008) indicating lower forced vital capacity and greater % change in MLDe/I (respectively) throughout methacholine testing, were also observed. CONCLUSION In addition to baseline differences, small-airway responsiveness (as represented by the change in MLDe/i ) during methacholine challenge is greater in obese women with asthma as compared to the non-obese.
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Affiliation(s)
- Arnaud Bourdin
- Department of Respiratory Diseases, Univ Montpellier, CHU Montpellier, Montpellier, France.,PhyMedExp, Univ Montpellier, CNRS, INSERM, CHU Montpellier, Montpellier, France
| | - Sébastien Bommart
- PhyMedExp, Univ Montpellier, CNRS, INSERM, CHU Montpellier, Montpellier, France.,Department of Medical Imaging, Univ Montpellier, CHU Montpellier, Montpellier, France
| | - Gregory Marin
- Department of Medical Information, Univ Montpellier, CHU Montpellier, Montpellier, France.,IDESP, INSERM, Univ Montpellier, CHU Montpellier, Montpellier, France
| | - Isabelle Vachier
- Department of Respiratory Diseases, Univ Montpellier, CHU Montpellier, Montpellier, France.,Department of Respiratory Diseases and Addictology, Medicine Biology Mediterranee, Arnaud de Villeneuve Hospital, CHRU Montpellier, Montpellier, France
| | - Anne Sophie Gamez
- Department of Respiratory Diseases, Univ Montpellier, CHU Montpellier, Montpellier, France
| | - Engi Ahmed
- Department of Respiratory Diseases, Univ Montpellier, CHU Montpellier, Montpellier, France
| | - Carey M Suehs
- Department of Respiratory Diseases, Univ Montpellier, CHU Montpellier, Montpellier, France.,Department of Medical Information, Univ Montpellier, CHU Montpellier, Montpellier, France
| | - Nicolas Molinari
- PhyMedExp, Univ Montpellier, CNRS, INSERM, CHU Montpellier, Montpellier, France.,Department of Medical Information, Univ Montpellier, CHU Montpellier, Montpellier, France.,IDESP, INSERM, Univ Montpellier, CHU Montpellier, Montpellier, France
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Gutting BW, Rukhin A, Mackie RS, Marchette D, Thran B. Evaluation of Inhaled Versus Deposited Dose Using the Exponential Dose-Response Model for Inhalational Anthrax in Nonhuman Primate, Rabbit, and Guinea Pig. RISK ANALYSIS : AN OFFICIAL PUBLICATION OF THE SOCIETY FOR RISK ANALYSIS 2015; 35:811-827. [PMID: 25545587 DOI: 10.1111/risa.12326] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The application of the exponential model is extended by the inclusion of new nonhuman primate (NHP), rabbit, and guinea pig dose-lethality data for inhalation anthrax. Because deposition is a critical step in the initiation of inhalation anthrax, inhaled doses may not provide the most accurate cross-species comparison. For this reason, species-specific deposition factors were derived to translate inhaled dose to deposited dose. Four NHP, three rabbit, and two guinea pig data sets were utilized. Results from species-specific pooling analysis suggested all four NHP data sets could be pooled into a single NHP data set, which was also true for the rabbit and guinea pig data sets. The three species-specific pooled data sets could not be combined into a single generic mammalian data set. For inhaled dose, NHPs were the most sensitive (relative lowest LD50) species and rabbits the least. Improved inhaled LD50 s proposed for use in risk assessment are 50,600, 102,600, and 70,800 inhaled spores for NHP, rabbit, and guinea pig, respectively. Lung deposition factors were estimated for each species using published deposition data from Bacillus spore exposures, particle deposition studies, and computer modeling. Deposition was estimated at 22%, 9%, and 30% of the inhaled dose for NHP, rabbit, and guinea pig, respectively. When the inhaled dose was adjusted to reflect deposited dose, the rabbit animal model appears the most sensitive with the guinea pig the least sensitive species.
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Affiliation(s)
- Bradford W Gutting
- CBR Concepts and Experimentation Branch (Z21), Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
| | - Andrey Rukhin
- Sensor Fusion Branch (Q33), Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
| | - Ryan S Mackie
- CBR Concepts and Experimentation Branch (Z21), Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
| | - David Marchette
- Sensor Fusion Branch (Q33), Naval Surface Warfare Center, Dahlgren Division, Dahlgren, VA, USA
| | - Brandolyn Thran
- U.S. Army Public Health Command, Aberdeen Proving Ground, MD, USA
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Raissy HH, Blake K. Small Airway Targeted Therapy in Pediatric Asthma: Are We There Yet? PEDIATRIC ALLERGY, IMMUNOLOGY, AND PULMONOLOGY 2013; 26:204-206. [PMID: 24380019 PMCID: PMC3869414 DOI: 10.1089/ped.2013.0304] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2013] [Accepted: 10/09/2013] [Indexed: 11/12/2022]
Abstract
Asthma is characterized by inflammation of proximal and distal airways. As new formulations of extrafine aerosol particles have become available, targeting small airways for the management of asthma has been investigated. As new studies attempt to explore the correlation between small airway dysfunction and clinical outcomes in asthma, well-designed clinical trials are needed to compare targeted and standard therapy for asthma management especially in pediatric patients.
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Affiliation(s)
- Hengameh H. Raissy
- Department of Pediatrics, Health Sciences Center, School of Medicine, University of New Mexico, Albuquerque, New Mexico
| | - Kathryn Blake
- Biomedical Research Department, Center for Clinical Pharmacogenomics and Translational Research, Nemours Children's Clinic, Jacksonville, Florida
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Ludviksdottir D, Diamant Z, Alving K, Bjermer L, Malinovschi A. Clinical aspects of using exhaled NO in asthma diagnosis and management. CLINICAL RESPIRATORY JOURNAL 2012; 6:193-207. [DOI: 10.1111/crj.12001] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
| | | | - Kjell Alving
- Department of Women's and Children's Health; Uppsala University; Uppsala; Sweden
| | - Leif Bjermer
- Department of Respiratory Diseases and Allergology; Skane University; Lund; Sweden
| | - Andrei Malinovschi
- Department of Medical Sciences: Clinical Physiology; Uppsala University; Uppsala; Sweden
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Cederfur C, Malmström J, Nihlberg K, Block M, Breimer ME, Bjermer L, Westergren-Thorsson G, Leffler H. Glycoproteomic identification of galectin-3 and -8 ligands in bronchoalveolar lavage of mild asthmatics and healthy subjects. Biochim Biophys Acta Gen Subj 2012; 1820:1429-36. [PMID: 22240167 DOI: 10.1016/j.bbagen.2011.12.016] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2011] [Revised: 12/23/2011] [Accepted: 12/26/2011] [Indexed: 01/13/2023]
Abstract
BACKGROUND Galectins, a family of small carbohydrate binding proteins, have been implicated in regulation of inflammatory reactions, including asthma and fibrosis in the lungs. Galectins are found in cells of the airways and in airway secretions, but their glycoprotein ligands there have only been studied to a very limited extent. METHODS Bronchoalveolar lavage (BAL) fluid from mild asthmatics and healthy volunteers were fractionated by affinity chromatography on the immobilized galectins. Total (10-30 μg) and galectin bound (~1-10 μg) protein fractions were identified, quantified and compared using shot-gun proteomics and spectral counts. RESULTS About 175 proteins were identified in unfractionated BAL-fluid, and about 100 bound galectin-3 and 60 bound galectin-8. These included plasma glycoproteins, and typical airway proteins such as SP-A2, PIGR and SP-B. The concentration of galectin-binding proteins was 100-300 times higher than the concentration of galectins in BAL. CONCLUSION The low relative concentration of galectins in BAL makes it likely that functional interactions with glycoproteins occur at sites rich in galectin, such as cells of the airways, rather than the extracellular fluid itself. The profile of galectin bound proteins differed between samples from asthma patients and healthy subjects and correlated with the presence of fibroblasts or eosinophils. This included appearance of a specific galectin-8-binding glycoform of haptoglobin, previously shown to be increased in serum in other inflammatory conditions. GENERAL SIGNIFICANCE It is technically feasible to identify galectin-binding glycoproteins in low concentration patient samples such as BAL-fluid, to generate biomedically interesting results. This article is part of a Special Issue entitled Glycoproteomics.
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Affiliation(s)
- Cecilia Cederfur
- MIG (Microbiology, Immunology, Glycobiology), Dept. of Laboratory Medicine Lund, Sweden
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