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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 J+Cell+Mol+Med
2017 ; 21
(11
): 2937-2949
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Nintedanib reduces ventilation-augmented bleomycin-induced epithelial-mesenchymal
transition and lung fibrosis through suppression of the Src pathway
#MMPMID28598023
Li LF
; Kao KC
; Liu YY
; Lin CW
; Chen NH
; Lee CS
; Wang CW
; Yang CT
J Cell Mol Med
2017[Nov]; 21
(11
): 2937-2949
PMID28598023
show ga
Mechanical ventilation (MV) used in patients with acute respiratory distress
syndrome (ARDS) can increase lung inflammation and pulmonary fibrogenesis. Src is
crucial in mediating the transforming growth factor (TGF)-?1-induced
epithelial-mesenchymal transition (EMT) during the fibroproliferative phase of
ARDS. Nintedanib, a multitargeted tyrosine kinase inhibitor that directly blocks
Src, has been approved for the treatment of idiopathic pulmonary fibrosis. The
mechanisms regulating interactions among MV, EMT and Src remain unclear. In this
study, we suggested hypothesized that nintedanib can suppress MV-augmented
bleomycin-induced EMT and pulmonary fibrosis by inhibiting the Src pathway. Five
days after administrating bleomycin to mimic acute lung injury (ALI), C57BL/6
mice, either wild-type or Src-deficient were exposed to low tidal volume (V(T) )
(6 ml/kg) or high V(T) (30 ml/kg) MV with room air for 5 hrs. Oral nintedanib was
administered once daily in doses of 30, 60 and 100 mg/kg for 5 days before MV.
Non-ventilated mice were used as control groups. Following bleomycin exposure in
wild-type mice, high V(T) MV induced substantial increases in microvascular
permeability, TGF-?1, malondialdehyde, Masson's trichrome staining, collagen 1a1
gene expression, EMT (identified by colocalization of increased staining of
?-smooth muscle actin and decreased staining of E-cadherin) and alveolar
epithelial apoptosis (P < 0.05). Oral nintedanib, which simulated genetic
downregulation of Src signalling using Src-deficient mice, dampened the
MV-augmented profibrotic mediators, EMT profile, epithelial apoptotic cell death
and pathologic fibrotic scores (P < 0.05). Our data indicate that nintedanib
reduces high V(T) MV-augmented EMT and pulmonary fibrosis after bleomycin-induced
ALI, partly by inhibiting the Src pathway.