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2014 ; 95
(5
): 715-722
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Recombinant human mannose-binding lectin dampens human alveolar macrophage
inflammatory responses to influenza A virus in vitro
#MMPMID24399838
Nelson B
; Zhou X
; White M
; Hartshorn K
; Takahashi K
; Kinane TB
; Anandaiah A
; Koziel H
J Leukoc Biol
2014[May]; 95
(5
): 715-722
PMID24399838
show ga
IAV pneumonia remains a serious global health problem, and preventative and
therapeutic strategies remain limited. AM are critical effector cells in the
control of influenza, impairing IAV replication, promoting IAV clearance, and
promoting efferocytosis and resolution of lung inflammation. MBL, an innate
immune pattern recognition molecule, present in the lungs, binds IAV, and plasma
MBL deficiency is associated with increased susceptibility to IAV, although the
mechanism remains incompletely understood, and the influence of MBL on the IAV-AM
interaction has not been established. In the current study, focusing on human
macrophages (U937 cell line and clinically relevant human AM), data demonstrated
that unopsonized IAV is readily internalized, induced release of TNF and ROS, and
promoted macrophage apoptosis. In contrast, IAV, opsonized with rhMBL, reduced
IAV uptake and macrophage apoptosis and dramatically reduced TNF release and ROS.
Macrophage host-defense responses were reduced further in the presence of MASPs.
Taken together, these data support the concept that rhMBL may serve a protective
innate host response and a critical biological response modifier function by
limiting AM inflammation, oxidative injury, and AM apoptosis, which may allow
effective IAV clearance while limiting collateral damage to vital organs, such as
the lungs.