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2015 ; 195
(6
): 2852-60
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Lipoxin A4 Attenuates Constitutive and TGF-?1-Dependent Profibrotic Activity in
Human Lung Myofibroblasts
#MMPMID26276873
Roach KM
; Feghali-Bostwick CA
; Amrani Y
; Bradding P
J Immunol
2015[Sep]; 195
(6
): 2852-60
PMID26276873
show ga
Idiopathic pulmonary fibrosis (IPF) is a common, progressive, and invariably
lethal interstitial lung disease with no effective therapy. The key cell driving
the development of fibrosis is the myofibroblast. Lipoxin A4 (LXA4) is an
anti-inflammatory lipid, important in the resolution of inflammation, and it has
potential antifibrotic activity. However, the effects of LXA4 on primary human
lung myofibroblasts (HLMFs) have not previously been investigated. Therefore, the
aim of this study was to examine the effects of LXA4 on TGF-?1-dependent
responses in IPF- and nonfibrotic control (NFC)-derived HLMFs. HLMFs were
isolated from IPF and NFC patients and grown in vitro. The effects of LXA4 on
HLMF proliferation, collagen secretion, ?-smooth muscle actin (?SMA) expression,
and Smad2/3 activation were examined constitutively and following TGF-?1
stimulation. The LXA4 receptor (ALXR) was expressed in both NFC- and IPF-derived
HLMFs. LXA4 (10(-10) and 10(-8) mol) reduced constitutive ?SMA expression, actin
stress fiber formation, contraction, and nuclear Smad2/3, indicating regression
from a myofibroblast to fibroblast phenotype. LXA4 also significantly inhibited
FBS-dependent proliferation and TGF-?1-dependent collagen secretion, ?SMA
expression, and Smad2/3 nuclear translocation in IPF-derived HLMFs. LXA4 did not
inhibit Smad2/3 phosphorylation. In summary, LXA4 attenuated profibrotic HLMF
activity and promoted HLMF regression to a quiescent fibroblast phenotype. LXA4
or its stable analogs delivered by aerosol may offer a novel approach to the
treatment of IPF.