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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+Physiol+Lung+Cell+Mol+Physiol
2014 ; 307
(1
): L94-105
Nephropedia Template TP
gab.com Text
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English Wikipedia
Lung fibroblasts accelerate wound closure in human alveolar epithelial cells
through hepatocyte growth factor/c-Met signaling
#MMPMID24748602
Ito Y
; Correll K
; Schiel JA
; Finigan JH
; Prekeris R
; Mason RJ
Am J Physiol Lung Cell Mol Physiol
2014[Jul]; 307
(1
): L94-105
PMID24748602
show ga
There are 190,600 cases of acute lung injury/acute respiratory distress syndrome
(ALI/ARDS) each year in the United States, and the incidence and mortality of
ALI/ARDS increase dramatically with age. Patients with ALI/ARDS have alveolar
epithelial injury, which may be worsened by high-pressure mechanical ventilation.
Alveolar type II (ATII) cells are the progenitor cells for the alveolar
epithelium and are required to reestablish the alveolar epithelium during the
recovery process from ALI/ARDS. Lung fibroblasts (FBs) migrate and proliferate
early after lung injury and likely are an important source of growth factors for
epithelial repair. However, how lung FBs affect epithelial wound healing in the
human adult lung has not been investigated in detail. Hepatocyte growth factor
(HGF) is known to be released mainly from FBs and to stimulate both migration and
proliferation of primary rat ATII cells. HGF is also increased in lung tissue,
bronchoalveolar lavage fluid, and serum in patients with ALI/ARDS. Therefore, we
hypothesized that HGF secreted by FBs would enhance wound closure in alveolar
epithelial cells (AECs). Wound closure was measured using a scratch wound-healing
assay in primary human AEC monolayers and in a coculture system with FBs. We
found that wound closure was accelerated by FBs mainly through HGF/c-Met
signaling. HGF also restored impaired wound healing in AECs from the elderly
subjects and after exposure to cyclic stretch. We conclude that HGF is the
critical factor released from FBs to close wounds in human AEC monolayers and
suggest that HGF is a potential strategy for hastening alveolar repair in
patients with ALI/ARDS.