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2016 ; 16
(1
): 132
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Baicalin attenuates bleomycin-induced pulmonary fibrosis via adenosine A2a
receptor related TGF-?1-induced ERK1/2 signaling pathway
#MMPMID27658704
Huang X
; He Y
; Chen Y
; Wu P
; Gui D
; Cai H
; Chen A
; Chen M
; Dai C
; Yao D
; Wang L
BMC Pulm Med
2016[Sep]; 16
(1
): 132
PMID27658704
show ga
BACKGROUND: Baicalin has been reported to have anti-fibrosis effect; however, its
mechanism still remains to be elucidated. Adenosine A2a receptor (A2aR) is a
novel inflammation regulator, and transforming growth factor-?1 (TGF-?1)-induced
extracellular signal regulated kinase1/2 (ERK1/2) signaling pathway plays an
important role in idiopathic pulmonary fibrosis (IPF). This study was to explore
the relationship of A2aR and TGF-?1-induced ERK1/2 in bleomycin (BLM)-induced
pulmonary fibrosis in mice, and to investigate whether A2aR mediate the
anti-fibrosis effect of Baicalin on BLM-induced pulmonary fibrosis. METHODS: The
A2aR-/- and A2aR+/+ mice were respectively divided into three groups: control
group, model group, baicalin group. Pulmonary fibrosis was induced in mice of
model groups by intratracheal instillation of bleomycin, and baicalin was
administered in mice of baicalin groups daily for 28 days. Histopathological and
ultrastructural changes of lung tissues were evaluated. Lung coefficient and the
levels of hydroxyproline (HYP) in lung tissues were measured at the same time.
The levels of serum TGF-?1 were measured by ELISA. The expression of TGF-?1,
ERK1/2, p-ERK1/2 and A2aR were detected by western blot and immunohistochemical
staining techniques. RESULTS: Severe lung fibrosis was observed in the
bleomycin-treated mice on day 28. The histopathological findings and collagen
content of lung tissues were much severer/higher in A2aR-/- mice than in A2aR+/+
mice. We also showed that TGF-?1 and p-ERK1/2 were upregulated in
bleomycin-treated mice and expressed higher in A2aR-/- mice compared to A2aR+/+
mice. Besides, bleomycin-treated A2aR+/+ mice had increased A2aR level in lungs.
However, long-term treatment with baicalin in A2aR-/- and A2aR+/+ mice
significantly ameliorated the histopathological changes in lungs. Moreover,
Increased TGF-?1 and p-ERK1/2 expressions in bleomycin-treated A2aR-/- and
A2aR+/+ mice were obviously diminished by baicalin. The baicalin-treated A2aR-/-
mice had severer lung fibrosis and higher expressions of TGF-?1 and p-ERK1/2 than
A2aR+/+ mice. Baicalin has also upregulated the expression of A2aR in A2aR+/+
mice. CONCLUSIONS: Genetic inactivation of A2aR exacerbated the pathological
processes of bleomycin-induced pulmonary fibrosis. Together, baicalin could
inhibit BLM-induced pulmonary fibrosis by upregulating A2aR, suggesting A2aR as a
therapeutic target of baicalin for the treatment of pulmonary fibrosis.