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• W2102952012 abstract "<h3>Background</h3> Airway neutrophilia is a recognised feature of chronic severe asthma, but the mechanisms that underlie this phenomenon are unknown. Evidence for factors present in airway secretions that prolong neutrophil survival has been sought and it has been hypothesised that these might be augmented in neutrophilic asthma. <h3>Methods</h3> Non-smoking subjects with severe asthma (SA) or mild asthma (MA) and healthy control subjects (HC) underwent sputum induction. The SA group was subdivided into subjects with neutrophil counts above (SA-high) and those within the normal range (SA-low). Apoptotic neutrophils were enumerated in the cellular phase while the fluid phase was assessed for its ability to prolong the in vitro survival of blood-derived neutrophils using morphometric and flow cytometric analyses. <h3>Results</h3> There was a significant difference between all four subject groups with respect to the percentage of apoptotic sputum neutrophils (Kruskal–Wallis, p=0.042). Cuzick test showed a highly significant (p=0.008) trend towards decreasing numbers of apoptotic neutrophils across the four groups with increasing asthma severity and neutrophil count. The sputum antiapoptotic activity was also different between the groups (p=0.039), with a highly significant (p=0.005) decreasing trend across the four groups. The survival effect could not be inhibited by blocking selective chemotaxin receptors, neutralising neutrophil survival factors, inhibiting phosphatidylinositol-3-kinase (using LY294002) or with pertussis toxin pretreatment. Similarly, it could not be explained by lipopolysaccharide contamination or by the presence of inhaled corticosteroids in sputum. <h3>Conclusions</h3> These data demonstrate the capacity of as yet unidentified factor(s) in the airways of subjects with asthma to delay human neutrophil apoptosis and extend their lifespan as a potential mechanism contributing to unresolving airways neutrophilia in severe asthma." @default.
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• W2102952012 date "2010-08-01" @default.
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• W2102952012 title "Prosurvival activity for airway neutrophils in severe asthma" @default.
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• W2102952012 doi "https://doi.org/10.1136/thx.2009.120741" @default.
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