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2016 ; 4
(5
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Aberrant nonfibrotic parenchyma in idiopathic pulmonary fibrosis is correlated
with decreased ?-catenin inhibition and increased Wnt5a/b interaction
#MMPMID26997628
Rydell-Törmänen K
; Zhou XH
; Hallgren O
; Einarsson J
; Eriksson L
; Andersson-Sjöland A
; Westergren-Thorsson G
Physiol Rep
2016[Mar]; 4
(5
): ä PMID26997628
show ga
Idiopathic pulmonary fibrosis (IPF), an insidious disease with grave prognosis,
is characterized by heterogeneous fibrosis with densely fibrotic areas surrounded
by nonfibrotic normal-looking tissue, believed to reflect a temporal development.
The etiology is incompletely elucidated, but aberrant wound healing is believed
to be involved. Embryonic signaling pathways, including Wnt signaling, are
reactivated in wound healing, and we therefore aimed to investigate Wnt
signaling, and hypothesized that Wnt signaling would correspond to degree of
fibrosis. Material from 10 patients with IPF were included (four diagnostic
biopsies and six donated lungs) and compared to healthy controls (n = 7). We
investigated markers of Wnt signaling (?-catenin, Wnt3a, ICAT, Wnt5a/b, DAAM1 and
NLK) histologically in lung parenchyma with variable degree of fibrosis. Our
results suggest that Wnt signaling is significantly altered (P < 0.05) already in
normal-looking parenchyma. The expression of Wnt3a and ICAT decreased (both
P < 0.01) in IPF compared to healthy lungs, whereas ?-catenin, Wnt5a/b, DAAM1 and
NLK increased (P < 0.05 for all). ICAT is further decreased in dense fibrosis
compared to normal-looking parenchyma in IPF (P < 0.001). On the basis of our
results, we conclude that from a Wnt perspective, there is no normal parenchyma
in IPF, and Wnt signaling corresponds to degree of fibrosis. In addition,
?-catenin and Wnt5a appears coupled, and decreased inhibition of ?-catenin may be
involved. We suggest that the interaction between ?-catenin, ICAT, and Wnt5a/b
may represent an important research area and potential target for therapeutic
intervention.