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Halayko AJ, Pascoe CD, Gereige JD, Peters MC, Cohen RT, Woodruff PG. Update in Adult Asthma 2020. Am J Respir Crit Care Med 2021; 204:395-402. [PMID: 34181860 DOI: 10.1164/rccm.202103-0552up] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
- Andrew J Halayko
- University of Manitoba, 8664, SECTION OF RESPIRATORY DISEASES, Winnipeg, Manitoba, Canada.,University of Manitoba, 8664, Biology of Breathing Group, Children's Hospital Research Institute of Manitoba, Winnipeg, Manitoba, Canada
| | - Christopher D Pascoe
- University of Manitoba, 8664, Physiology and Pathophysiology, Winnipeg, Manitoba, Canada.,University of Manitoba Children's Hospital Research Institute of Manitoba, 423136, Winnipeg, Manitoba, Canada
| | - Jessica D Gereige
- Boston University School of Medicine, 12259, Division of Pulmonary, Allergy, Sleep, and Critical Care Medicine, Department of Medicine, Boston, Massachusetts, United States
| | - Michael C Peters
- University of California San Francisco, 8785, Pulmonary and Critical Care, San Francisco, California, United States
| | - Robyn T Cohen
- Boston University School of Medicine, 12259, Pediatrics, Boston, Massachusetts, United States
| | - Prescott G Woodruff
- UCSF, 8785, Division of Pulmonary and Critical Care Medicine, Department of Medicine and CVRI, San Francisco, California, United States;
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Murphy RC, Lai Y, Nolin JD, Aguillon Prada RA, Chakrabarti A, Novotny MV, Seeds MC, Altemeier WA, Gelb MH, Hite RD, Hallstrand TS. Exercise-induced alterations in phospholipid hydrolysis, airway surfactant, and eicosanoids and their role in airway hyperresponsiveness in asthma. Am J Physiol Lung Cell Mol Physiol 2021; 320:L705-L714. [PMID: 33533300 DOI: 10.1152/ajplung.00546.2020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
Abstract
The mechanisms responsible for driving endogenous airway hyperresponsiveness (AHR) in the form of exercise-induced bronchoconstriction (EIB) are not fully understood. We examined alterations in airway phospholipid hydrolysis, surfactant degradation, and lipid mediator release in relation to AHR severity and changes induced by exercise challenge. Paired induced sputum (n = 18) and bronchoalveolar lavage (BAL) fluid (n = 11) were obtained before and after exercise challenge in asthmatic subjects. Samples were analyzed for phospholipid structure, surfactant function, and levels of eicosanoids and secreted phospholipase A2 group 10 (sPLA2-X). A primary epithelial cell culture model was used to model effects of osmotic stress on sPLA2-X. Exercise challenge resulted in increased surfactant degradation, phospholipase activity, and eicosanoid production in sputum samples of all patients. Subjects with EIB had higher levels of surfactant degradation and phospholipase activity in BAL fluid. Higher basal sputum levels of cysteinyl leukotrienes (CysLTs) and prostaglandin D2 (PGD2) were associated with direct AHR, and both the postexercise and absolute change in CysLTs and PGD2 levels were associated with EIB severity. Surfactant function either was abnormal at baseline or became abnormal after exercise challenge. Baseline levels of sPLA2-X in sputum and the absolute change in amount of sPLA2-X with exercise were positively correlated with EIB severity. Osmotic stress ex vivo resulted in movement of water and release of sPLA2-X to the apical surface. In summary, exercise challenge promotes changes in phospholipid structure and eicosanoid release in asthma, providing two mechanisms that promote bronchoconstriction, particularly in individuals with EIB who have higher basal levels of phospholipid turnover.
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Affiliation(s)
- Ryan C Murphy
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington.,Center for Lung Biology, University of Washington, Seattle, Washington
| | - Ying Lai
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington.,Center for Lung Biology, University of Washington, Seattle, Washington
| | - James D Nolin
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington.,Center for Lung Biology, University of Washington, Seattle, Washington
| | - Robier A Aguillon Prada
- Department of Critical Care, Cleveland Clinic, Cleveland, Ohio.,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | - Arindam Chakrabarti
- Department of Critical Care, Cleveland Clinic, Cleveland, Ohio.,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | - Michael V Novotny
- Department of Critical Care, Cleveland Clinic, Cleveland, Ohio.,Department of Pathobiology, Cleveland Clinic, Cleveland, Ohio
| | - Michael C Seeds
- Section on Molecular Medicine, Wake Forest University, Winston-Salem, North Carolina
| | - William A Altemeier
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington.,Center for Lung Biology, University of Washington, Seattle, Washington
| | - Michael H Gelb
- Department of Chemistry, University of Washington, Seattle, Washington.,Department of Biochemistry, University of Washington, Seattle, Washington
| | - Robert Duncan Hite
- Division of Pulmonary Disease & Critical Care Medicine, Department of Medicine, University of Cincinnati, Cincinnati, Ohio
| | - Teal S Hallstrand
- Division of Pulmonary, Critical Care, and Sleep Medicine, Department of Medicine, University of Washington, Seattle, Washington.,Center for Lung Biology, University of Washington, Seattle, Washington
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