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Initiation of LPS-induced pulmonary dysfunction and its recovery occur independent of T cells.

Abstract：

BACKGROUND:The acute respiratory distress syndrome (ARDS) is a serious disease in critically ill patients that is characterized by pulmonary dysfunctions, hypoxemia and significant mortality. Patients with immunodeficiency (e.g. SCID with T and B cell deficiency) are particularly susceptible to the development of severe ARDS. However, the role of T cells on pulmonary dysfunctions in immune-competent patients with ARDS is only incompletely understood. METHODS:Wild-type (wt) and RAG2-/- mice (lymphocyte deficient) received intratracheal instillations of LPS (4 mg/kg) or saline. On day 1, 4 and 10 lung mechanics and bronchial hyperresponsiveness towards acetylcholine were measured with the flexiVent ventilation set-up. The bronchoalveolar lavage fluid (BALF) was examined for leukocytes (FACS analysis) and pro-inflammatory cytokines (ELISA). RESULTS:In wt mice, lung mechanics, body weight and body temperature deteriorated in the LPS-group during the early phase (up to d4); these alterations were accompanied by increased leukocyte numbers and inflammatory cytokine levels in the BALF. During the late phase (day 10), both lung mechanics and the cell/cytokine homeostasis recovered in LPS-treated wt mice. RAG2-/- mice experienced changes in body weight, lung mechanics, BAL neutrophil numbers, BAL inflammatory cytokines levels that were comparable to wt mice. CONCLUSION:Following LPS instillation, lung mechanics deteriorate within the first 4 days and recover towards day 10. This response is not altered by the lack of T lymphocytes suggesting that T cells play only a minor role for the initiation, propagation or recovery of LPS-induced lung dysfunctions or function of T lymphocytes can be compensated by other immune cells, such as alveolar macrophages.

journal_name

BMC Pulm Med

journal_title

BMC pulmonary medicine

authors

Verjans E,Kanzler S,Ohl K,Rieg AD,Ruske N,Schippers A,Wagner N,Tenbrock K,Uhlig S,Martin C

doi

10.1186/s12890-018-0741-2

subject

Has Abstract

pub_date

2018-11-22 00:00:00

pages

174

issue

1

issn

1471-2466

pii

10.1186/s12890-018-0741-2

journal_volume

18

pub_type

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