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2011 ; 204
(7
): 1086-94
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Lowering the threshold of lung innate immune cell activation alters
susceptibility to secondary bacterial superinfection
#MMPMID21881124
Goulding J
; Godlee A
; Vekaria S
; Hilty M
; Snelgrove R
; Hussell T
J Infect Dis
2011[Oct]; 204
(7
): 1086-94
PMID21881124
show ga
BACKGROUND: Previous studies have shown that the interaction of CD200R, a myeloid
inhibitory receptor, with its ligand, CD200, is critical in the control of innate
immune activation in the lung. METHODS AND RESULTS: Using a mouse model of
bacterial superinfection following influenza, we show that an absence of CD200R
(a negative regulator highly expressed by macrophages and dendritic cells),
restricts commensal and exogenous bacterial invasiveness and completely prevents
the mortality observed in wild-type mice. This benefit is due to a heightened
innate immune response to influenza virus in cd200r knockout mice that limits
immune pathogenesis and viral load. In wild-type mice, apoptotic cells expressing
CD200 that we believe contribute to the suppressed innate immune response to
bacteria dominate during the resolution phase of influenza-induced inflammation.
We also show for the first time the presence of a variety of previously
unidentified bacterial species in the lower airways that are significantly
adjusted by influenza virus infection and may contribute to the pathophysiology
of disease. CONCLUSIONS: The interaction of CD200 with CD200R therefore
contributes to the hyporesponsive innate immune state following influenza virus
infection that predisposes to secondary bacterial infection, a phenomenon that
has the potential for immune modulation.
|Animals
[MESH]
|Antigens, CD/*immunology
[MESH]
|Bronchoalveolar Lavage Fluid
[MESH]
|Female
[MESH]
|Immunity, Innate
[MESH]
|Influenza A Virus, H1N1 Subtype/*immunology
[MESH]
|Influenza A Virus, H3N2 Subtype/*immunology
[MESH]