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2016 ; 16
(1
): 94
Nephropedia Template TP
gab.com Text
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English Wikipedia
Eosinophils enhance WNT-5a and TGF-?1 genes expression in airway smooth muscle
cells and promote their proliferation by increased extracellular matrix proteins
production in asthma
#MMPMID27297409
Januskevicius A
; Vaitkiene S
; Gosens R
; Janulaityte I
; Hoppenot D
; Sakalauskas R
; Malakauskas K
BMC Pulm Med
2016[Jun]; 16
(1
): 94
PMID27297409
show ga
BACKGROUND: Recent studies have suggested that eosinophils may have a direct
effect on airway smooth muscle cells (ASMC), causing their proliferation in
patients with asthma, but the precise mechanism of the interaction between these
cells remains unknown. We propose that changes in Wnt signaling activity and
extracellular matrix (ECM) production may help explain these findings. Therefore,
the aim of this study was to investigate the effect of eosinophils from asthmatic
and non-asthmatic subjects on Wnt-5a, transforming growth factor ?1 (TGF-?1), and
ECM protein (fibronectin and collagen) gene expression and ASMC proliferation.
METHODS: A total of 18 subjects were involved in the study: 8 steroid-free asthma
patients and 10 healthy subjects. Peripheral blood eosinophils were isolated
using centrifugation and magnetic separation. An individual co-culture of
eosinophils with human ASMC was prepared for each study subject. Adhesion of
eosinophils to ASMC (evaluated by assaying eosinophil peroxidase activity) was
determined following various incubation periods (30, 45, 60, 120, and 240 min).
The expression of Wnt-5a, TGF-?1, and ECM protein genes in ASMC was measured
using quantitative real-time polymerase chain reaction (PCR) after 24 h of
co-culture. Proliferation of ASMC was measured using the Alamar blue method after
48 h and 72 h of co-culture with eosinophils. RESULTS: Eosinophils from asthmatic
subjects demonstrated increased adhesion to ASMC compared with eosinophils from
healthy subjects (p?0.05) in vitro. The expression of Wnt-5a, TGF-?1, collagen,
and fibronectin genes in ASMC was significantly higher after 24 h of co-culture
with eosinophils from asthmatic subjects, while co-culture of ASMC with
eosinophils from healthy subjects increased only TGF-?1 and fibronectin gene
expression. ASMC proliferation was augmented after co-culture with eosinophils
from asthma patients compared with co-culture with eosinophils from healthy
subjects (p?0.05). CONCLUSIONS: Eosinophils enhance Wnt-5a, TGF-?1,
fibronectin, and collagen gene expression in ASMC and promote proliferation of
these cells in asthma. TRIAL REGISTRATION: ClinicalTrials.gov Identifier:
NCT02648074 .