Alveolar recruitment of ficolin-3 in response to acute pulmonary inflammation in humans

TY - JOUR

T1 - Alveolar recruitment of ficolin-3 in response to acute pulmonary inflammation in humans

AU - Plovsing, Ronni R

AU - Berg, Ronan M G

AU - Munthe-Fog, Lea

AU - Konge, Lars

AU - Iversen, Martin

AU - Møller, Kirsten

AU - Garred, Peter

N1 - Copyright © 2016 Elsevier GmbH. All rights reserved.

PY - 2016/5/1

Y1 - 2016/5/1

N2 - Background: Ficolins serve as soluble recognition molecules in the lectin pathway of complement. They are known to participate in the systemic host-response to infection but their role in local pulmonary defence is still incompletely understood. The purpose of this study was to clarify whether acute lung and systemic inflammation induce recruitment of lectins in humans. Methods: Fifteen healthy volunteers received LPS intravenously (IV) or in a lung subsegment on two different occasions. Volunteers were evaluated by consecutive blood samples and by bronchoalveolar lavage 2, 4, 6, 8, or 24 h after LPS (n = 3 in all groups), and gene expression patterns and protein levels of mannose-binding lectin (MBL) and ficolins were determined. Results: Endobronchial LPS was associated with an increase in alveolar ficolin-3 and MBL levels (p < 0.04 and p < 0.001, respectively). IV LPS elicited a pronounced acute phase response with an increase in CRP (p < 0.001) and plasma ficolin-1 protein levels (p < 0.001), whereas no changes were observed in ficolin-1 gene expression patterns (p = 0.11) or plasma protein levels of MBL, ficolin-2, or ficolin-3. Conclusions: LPS induces a tissue-specific recruitment of ficolin-3 and ficolin-1 in the lung and systemic compartment, respectively, suggesting an important role of distinct lectin complement pathway initiators in the local pulmonary and systemic host defence.

AB - Background: Ficolins serve as soluble recognition molecules in the lectin pathway of complement. They are known to participate in the systemic host-response to infection but their role in local pulmonary defence is still incompletely understood. The purpose of this study was to clarify whether acute lung and systemic inflammation induce recruitment of lectins in humans. Methods: Fifteen healthy volunteers received LPS intravenously (IV) or in a lung subsegment on two different occasions. Volunteers were evaluated by consecutive blood samples and by bronchoalveolar lavage 2, 4, 6, 8, or 24 h after LPS (n = 3 in all groups), and gene expression patterns and protein levels of mannose-binding lectin (MBL) and ficolins were determined. Results: Endobronchial LPS was associated with an increase in alveolar ficolin-3 and MBL levels (p < 0.04 and p < 0.001, respectively). IV LPS elicited a pronounced acute phase response with an increase in CRP (p < 0.001) and plasma ficolin-1 protein levels (p < 0.001), whereas no changes were observed in ficolin-1 gene expression patterns (p = 0.11) or plasma protein levels of MBL, ficolin-2, or ficolin-3. Conclusions: LPS induces a tissue-specific recruitment of ficolin-3 and ficolin-1 in the lung and systemic compartment, respectively, suggesting an important role of distinct lectin complement pathway initiators in the local pulmonary and systemic host defence.

U2 - 10.1016/j.imbio.2015.11.015

DO - 10.1016/j.imbio.2015.11.015

M3 - Journal article

C2 - 26868430

SN - 0171-2985

VL - 221

SP - 690

EP - 697

JO - Immunobiology

JF - Immunobiology

IS - 5

ER -