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- W4313360130 abstract "Abstract CO2 produced by systemic cellular respiration is hydrated into carbonic acid (H2CO3) that dissociates into H+ and HCO3−. These are transported in the plasma to the lungs where HCO3− is converted back into H2CO3 and CO2 that are expelled through breathing. Evidence suggests that dysfunction of the mechanisms that govern these processes may result in the development of respiratory acidosis (RA) and the cardinal features of severe, steroid-resistant (SSR) asthma. Reduced lung function, which occurs in SSR asthma, impairs removal of volatile H2CO3 and CO2, resulting in acid accumulation and increased arterial PaCO2. Patients with severe asthma often develop complications from increased PaCO2, which skews the PaCO2/HCO3− ratio resulting in increased H+ concentration and reduced pH. We developed three mouse models of respiratory infection and ovalbumin-induced SSR allergic airways disease (SSRAAD) that are highly representative of SSR asthma in humans. We used these models to show a role for impaired homeostatic acid-base balance in SSR asthma. All three infections suppress the induction of the expression of the chloride (Cl−)/HCO− pump, Slc26a4, in the airway mucosa in AAD. Importantly, SSRAAD is associated with increased levels of free H+ ions in bronchoalveolar lavage fluid. Administration of Slc26a4-specific siRNA in steroid-sensitive AAD, which mimics the effect of decreased Slc26a4 responses in SSRAAD, induced RA and steroid-resistant airway inflammation and AHR. Importantly, treatment of RA with NaHCO3 during infection-induced SSRAAD suppressed steroid-resistant AHR. Thus, we have identified a previously unrecognised role for deficient Slc26a4 responses that result in the development of RA and the pathogenesis of SSRAAD." @default.
- W4313360130 created "2023-01-06" @default.
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- W4313360130 date "2017-05-01" @default.
- W4313360130 modified "2023-09-27" @default.
- W4313360130 title "Impaired induction of <i>Slc26a4</i> promotes respiratory acidosis and severe, steroid-resistant asthma" @default.
- W4313360130 doi "https://doi.org/10.4049/jimmunol.198.supp.53.9" @default.
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