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2015 ; 8
(8
): 877-90
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Enolase 1 (ENO1) and protein disulfide-isomerase associated 3 (PDIA3) regulate
Wnt/?-catenin-driven trans-differentiation of murine alveolar epithelial cells
#MMPMID26035385
Mutze K
; Vierkotten S
; Milosevic J
; Eickelberg O
; Königshoff M
Dis Model Mech
2015[Aug]; 8
(8
): 877-90
PMID26035385
show ga
The alveolar epithelium represents a major site of tissue destruction during lung
injury. It consists of alveolar epithelial type I (ATI) and type II (ATII) cells.
ATII cells are capable of self-renewal and exert progenitor function for ATI
cells upon alveolar epithelial injury. Cell differentiation pathways enabling
this plasticity and allowing for proper repair, however, are poorly understood.
Here, we applied proteomics, expression analysis and functional studies in
primary murine ATII cells to identify proteins and molecular mechanisms involved
in alveolar epithelial plasticity. Mass spectrometry of cultured ATII cells
revealed a reduction of carbonyl reductase 2 (CBR2) and an increase in enolase 1
(ENO1) and protein disulfide-isomerase associated 3 (PDIA3) protein expression
during ATII-to-ATI cell trans-differentiation. This was accompanied by increased
Wnt/?-catenin signaling, as analyzed by qRT-PCR and immunoblotting. Notably, ENO1
and PDIA3, along with T1? (podoplanin; an ATI cell marker), exhibited decreased
protein expression upon pharmacological and molecular Wnt/?-catenin inhibition in
cultured ATII cells, whereas CBR2 levels were stabilized. Moreover, we analyzed
primary ATII cells from mice with bleomycin-induced lung injury, a model
exhibiting activated Wnt/?-catenin signaling in vivo. We observed reduced CBR2
significantly correlating with surfactant protein C (SFTPC), whereas ENO1 and
PDIA3 along with T1? were increased in injured ATII cells. Finally,
siRNA-mediated knockdown of ENO1, as well as PDIA3, in primary ATII cells led to
reduced T1? expression, indicating diminished cell trans-differentiation. Our
data thus identified proteins involved in ATII-to-ATI cell trans-differentiation
and suggest a Wnt/?-catenin-driven functional role of ENO1 and PDIA3 in alveolar
epithelial cell plasticity in lung injury and repair.