Integrin-linked kinase mediates CTGF-induced epithelial to mesenchymal transition in alveolar type II epithelial cells.
Pediatr Res
; 77(4): 520-7, 2015 Apr.
Article
en En
| MEDLINE
| ID: mdl-25580742
ABSTRACT
BACKGROUND:
Overexpression of connective tissue growth factor (CTGF) in alveolar type II epithelial (AT II) cells disrupts alveolar structure, causes interstitial fibrosis, and upregulates integrin-linked kinase (ILK). Whether CTGF-ILK signaling induces epithelial to mesenchymal transition (EMT) in AT II cells is unknown.METHODS:
Transgenic mice with targeted overexpression of CTGF in AT II cells were generated utilizing the surfactant protein C (SP-C) gene promoter and doxycycline-inducible system. AT II cells were isolated from 4-wk-old CTGF-overexpressing (CTGF+) mice and control littermates, and cultured on Matrigel. Cells were transfected with ILK siRNA, and cell morphology and expression of cell differentiation markers were analyzed.RESULTS:
The AT II cells from the control lungs grew in clusters and formed alveolar-like cysts and expressed SP-C. In contrast, the cells from CTGF+ lungs were spread and failed to form alveolar-like cysts. These cells expressed higher levels of CTGF, α smooth muscle actin (α-SMA), fibronectin and vimentin, the mesenchymal markers, suggesting EMT-like changes. Transfection with ILK siRNA not only dramatically attenuated ILK expression, but also decreased α-SMA expression as well as reversed cell morphological changes in CTGF+ AT II cells.CONCLUSION:
Overexpression of CTGF induces EMT in mouse primary AT II cells and this is mediated by ILK.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Alveolos Pulmonares
/
Proteínas Serina-Treonina Quinasas
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Células Epiteliales
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Factor de Crecimiento del Tejido Conjuntivo
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Transición Epitelial-Mesenquimal
Límite:
Animals
Idioma:
En
Revista:
Pediatr Res
Año:
2015
Tipo del documento:
Article