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.jpg): Failed to open stream: No such file or directory in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 117 Am+J+Respir+Cell+Mol+Biol
2015 ; 53
(3
): 378-90
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The Lung-Liver Axis: A Requirement for Maximal Innate Immunity and
Hepatoprotection during Pneumonia
#MMPMID25607543
Hilliard KL
; Allen E
; Traber KE
; Yamamoto K
; Stauffer NM
; Wasserman GA
; Jones MR
; Mizgerd JP
; Quinton LJ
Am J Respir Cell Mol Biol
2015[Sep]; 53
(3
): 378-90
PMID25607543
show ga
The hepatic acute-phase response (APR), stimulated by injury or inflammation, is
characterized by significant changes in circulating acute-phase protein (APP)
concentrations. Although individual functions of liver-derived APPs are known,
the net consequence of APP changes is unclear. Pneumonia, which induces the APR,
causes an inflammatory response within the airspaces that is coordinated largely
by alveolar macrophages and is typified by cytokine production, leukocyte
recruitment, and plasma extravasation, the latter of which may enable delivery of
hepatocyte-derived APPs to the infection site. To determine the functional
significance of the hepatic APR during pneumonia, we challenged APR-null mice
lacking hepatocyte signal transducer and activator of transcription 3 (STAT3) and
v-rel avian reticuloendotheliosis viral oncogene homolog A (RelA) with
Escherichia coli in the airspaces. APR-null mice displayed ablated APP induction,
significantly increased mortality, liver injury and apoptosis, and a trend toward
increased bacterial burdens. TNF-? neutralization reversed hepatotoxicity, but
not mortality, suggesting that APR-dependent survival is not solely due to
hepatoprotection. After a milder (nonlethal) E. coli infection,
hepatocyte-specific mutations decreased APP concentrations and pulmonary
inflammation in bronchoalveolar lavage fluid. Cytokine expression in airspace
macrophages, but not other airspace or circulating cells, was significantly
dependent on APP extravasation into the alveoli. These data identify a novel
signaling axis whereby the liver response enhances macrophage activation and
pulmonary inflammation during pneumonia. Although hepatic acute-phase changes
directly curb injury induced by TNF-? in the liver itself, APPs downstream of
these same signals promote survival in association with innate immunity in the
lungs, thus demonstrating a critical role for the lung-liver axis during
pneumonia.