Abstract:
BACKGROUND:During a lipopolysaccharide-induced lung inflammation, a massive accumulation of neutrophils occurs, which is normally cleared by macrophage phagocytosis following neutrophil apoptosis. However, in cases of extensive apoptosis the normal clearance system may fail, resulting in extensive neutrophil secondary necrosis. The aim of this study was to explore the hypothesis that neutrophils, in areas of the lung with extensive cellular infiltration, contribute to clearance by phagocytosing apoptotic cells and/or cell debris derived from secondary necrosis. METHODS:Intranasal lipopolysaccharide administration was used to induce lung inflammation in mice. The animals were sacrificed at seven time points following administration, bronchoalveolar lavage was performed and tissue samples obtained. Electron microscopy and histochemistry was used to assess neutrophil phagocytosis. RESULTS:Electron microscopic studies revealed that phagocytosing neutrophils was common, at 24 h after LPS administration almost 50% of the total number of neutrophils contained phagosomes, and the engulfed material was mainly derived from other neutrophils. Histochemistry on bronchoalvolar lavage cells further showed phagocytosing neutrophils to be frequently occurring. CONCLUSION:Neutrophils are previously known to phagocytose invading pathogens and harmful particles. However, this study demonstrates that neutrophils are also able to engulf apoptotic neutrophils or cell debris resulting from secondary necrosis of neutrophils. Neutrophils may thereby contribute to clearance and resolution of inflammation, thus acting as a back up system in situations when the macrophage clearance system is insufficient and/or overwhelmed.
journal_name
Respir Resjournal_title
Respiratory researchauthors
Rydell-Törmänen K,Uller L,Erjefält JSdoi
10.1186/1465-9921-7-143subject
Has Abstractpub_date
2006-12-14 00:00:00pages
143eissn
1465-9921issn
1465-993Xpii
1465-9921-7-143journal_volume
7pub_type
杂志文章abstract::Despite much information on their catalytic properties and gene regulation, we actually know very little of what matrix metalloproteinases (MMPs) do in tissues. The catalytic activity of these enzymes has been implicated to function in normal lung biology by participating in branching morphogenesis, homeostasis, and r...
journal_title:Respiratory research
pub_type: 杂志文章,评审
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abstract:BACKGROUND:Little is known about the association between cigarette smoking and asthma severity. We assessed smoking as a determinant of disease severity and control in a cohort of clinic-referred allergic subjects who developed new onset asthma. METHODS:Allergic rhinitis subjects with no asthma (n = 371) were followed...
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pub_type: 杂志文章,meta分析
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pub_type: 杂志文章,meta分析
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pub_type: 临床试验,杂志文章
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pub_type: 杂志文章
doi:10.1186/s12931-017-0709-4
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pub_type: 杂志文章,评审
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pub_type: 杂志文章,评审
doi:10.1186/s12931-017-0637-3
更新日期:2017-08-10 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/1465-9921-12-100
更新日期:2011-08-02 00:00:00
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doi:10.1186/s12931-020-01495-w
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doi:10.1186/s12931-020-01513-x
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pub_type: 临床试验,杂志文章
doi:10.1186/1465-9921-6-81
更新日期:2005-07-24 00:00:00
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pub_type: 杂志文章,随机对照试验
doi:10.1186/s12931-018-0950-5
更新日期:2018-12-07 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/1465-9921-12-43
更新日期:2011-04-10 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/1465-9921-13-63
更新日期:2012-07-31 00:00:00
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pub_type: 杂志文章
doi:10.1186/s12931-017-0616-8
更新日期:2017-07-06 00:00:00
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pub_type: 杂志文章
doi:10.1186/s12931-018-0855-3
更新日期:2018-09-03 00:00:00
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pub_type: 杂志文章
doi:10.1186/s12931-019-1051-9
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journal_title:Respiratory research
pub_type: 临床试验,杂志文章
doi:10.1186/1465-9921-6-95
更新日期:2005-08-16 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章,meta分析
doi:10.1186/s12931-019-1209-5
更新日期:2019-10-29 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/1465-9921-15-35
更新日期:2014-03-25 00:00:00
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pub_type: 杂志文章
doi:10.1186/s12931-020-1297-2
更新日期:2020-01-28 00:00:00
abstract:BACKGROUND:Acute respiratory distress syndrome (ARDS) is a severe form of lung injury characterized by damage to the epithelial barrier with subsequent pulmonary edema and hypoxic respiratory failure. ARDS is a significant medical problem in intensive care units with associated high care costs. There are many potential...
journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/s12931-018-0856-2
更新日期:2018-08-22 00:00:00
abstract:BACKGROUND:Diesel exhaust particles (DEPs) are deposited into the respiratory tract and are thought to be a risk factor for the development of diseases of the respiratory system. In healthy individuals, the timing and mechanisms of respiratory tract injuries caused by chronic exposure to air pollution remain to be clar...
journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/s12931-015-0172-z
更新日期:2015-02-07 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章,随机对照试验
doi:10.1186/s12931-019-1009-y
更新日期:2019-02-22 00:00:00
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journal_title:Respiratory research
pub_type: 杂志文章
doi:10.1186/s12931-017-0645-3
更新日期:2017-08-29 00:00:00
abstract:BACKGROUND:Quality of life (QoL) is profoundly impaired in patients with idiopathic pulmonary fibrosis (IPF). However, data is limited regarding the course of QoL. We therefore analysed longitudinal data from the German INSIGHTS-IPF registry. METHODS:Clinical status and QoL were assessed at enrollment and subsequently...
journal_title:Respiratory research
pub_type: 杂志文章,多中心研究
doi:10.1186/s12931-019-1020-3
更新日期:2019-03-15 00:00:00