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2018 ; 9
(ä): 738
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Casein Kinase 1?/? Inhibitor, PF670462 Attenuates the Fibrogenic Effects of
Transforming Growth Factor-? in Pulmonary Fibrosis
#MMPMID30042678
Keenan CR
; Langenbach SY
; Jativa F
; Harris T
; Li M
; Chen Q
; Xia Y
; Gao B
; Schuliga MJ
; Jaffar J
; Prodanovic D
; Tu Y
; Berhan A
; Lee PVS
; Westall GP
; Stewart AG
Front Pharmacol
2018[]; 9
(ä): 738
PMID30042678
show ga
Transforming growth factor-beta (TGF-?) is a major mediator of fibrotic diseases,
including idiopathic pulmonary fibrosis (IPF). However, therapeutic global
inhibition of TGF-? is limited by unwanted immunosuppression and mitral valve
defects. We performed an extensive literature search to uncover a little-known
connection between TGF-? signaling and casein kinase (CK) activity. We have
examined the abundance of CK1 delta and epsilon (CK1?/?) in lung tissue from IPF
patients and non-diseased controls, and investigated whether inhibition of CK1?/?
with PF670462 inhibits pulmonary fibrosis. CK1?/? levels in lung tissue from IPF
patients and non-diseased controls were assessed by immunohistochemistry.
Anti-fibrotic effects of the CK1?/? inhibitor PF670462 were assessed in
pre-clinical models, including acute and chronic bleomycin mouse models and in
vitro experiments on spheroids made from primary human lung fibroblast cells from
IPF and control donors, and human A549 alveolar-like adenocarcinoma-derived
epithelial cells. Increased expression of CK1? and ? in IPF lungs compared to
non-diseased controls was accompanied by increased levels of the product,
phospho-period 2. In vitro, PF670462 prevented TGF-?-induced
epithelial-mesenchymal transition. The stiffness of IPF-derived spheroids was
reduced by PF670462 and TGF-?-induced fibrogenic gene expression was inhibited.
The CK1?/? inhibitor PF670462 administered systemically or locally by inhalation
prevented both acute and chronic bleomycin-induced pulmonary fibrosis in mice.
PF670462 administered in a 'therapeutic' regimen (day 7 onward) prevented
bleomycin-induced lung collagen accumulation. Elevated expression and activity of
CK1 ? and ? in IPF and anti-fibrogenic effects of the dual CK1?/? inhibitor,
PF670462, support CK1?/? as novel therapeutic targets for IPF.