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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
2016 ; 55
(5
): 617-622
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An Inhaled Inhibitor of Myristoylated Alanine-Rich C Kinase Substrate Reverses
LPS-Induced Acute Lung Injury in Mice
#MMPMID27556883
Yin Q
; Fang S
; Park J
; Crews AL
; Parikh I
; Adler KB
Am J Respir Cell Mol Biol
2016[Nov]; 55
(5
): 617-622
PMID27556883
show ga
Intratracheal instillation of bacterial LPS is a well-established model of acute
lung injury (ALI) and/or acute respiratory distress syndrome (ARDS). Because the
myristoylated alanine-rich C kinase substrate (MARCKS) protein is involved in
neutrophil migration and proinflammatory cytokine production, we examined whether
an aerosolized peptide that inhibits MARCKS function could attenuate LPS-induced
lung injury in mice. The peptide, BIO-11006, was delivered at 50 ?M via
inhalation either just before intratracheal instillation of 5 ?g of LPS into
Balb/C mice, or 4, 12, 24, or 36 hours after LPS instillation. Effects of
BIO-11006 were evaluated via analysis of mouse disease-related behavior, lung
histology, bronchoalveolar lavage fluid total protein, neutrophil counts and
percentages, cytokine (KC [CXCl1, mouse IL-8 equivalent] and TNF-?) expression,
and activation of NF-?B in lung tissue. Treatment with aerosolized BIO-11006 at
0, 4, 12, 24, and even 36 hours after LPS instillation reversed the disease
process: mouse behavior returned to normal after two treatments 12 hours apart
with the inhaled peptide after LPS injury, whereas control LPS-instilled animals
treated with PBS only remained moribund. Histological appearance of inflammation,
bronchoalveolar lavage fluid protein levels, leukocyte and neutrophil numbers, KC
and TNF-? gene and protein expression, and NF-?B activation were all
significantly attenuated by inhaled BIO-11006 at all time points. These results
implicate MARCKS protein in the pathogenesis of ALI/ARDS and suggest that
MARCKS-inhibitory peptide(s), delivered by inhalation, could represent a new and
potent therapeutic treatment for ALI/ARDS, even if administered well after the
disease process has begun.