Inhibition of β-catenin signaling protects against CTGF-induced alveolar and vascular pathology in neonatal mouse lung.

Abstract:

BACKGROUND:Bronchopulmonary dysplasia (BPD) is the most common and serious chronic lung disease of premature infants. Connective tissue growth factor (CTGF) plays an important role in tissue development and remodeling. We have previously shown that targeted overexpression of CTGF in alveolar type II epithelial cells results in BPD-like pathology and activates β-catenin in neonatal mice. METHODS:Utilizing this transgenic mouse model and ICG001, a specific pharmacological inhibitor of β-catenin, we tested the hypothesis that β-catenin signaling mediates the effects of CTGF in the neonatal lung. Newborn CTGF mice and control littermates received ICG001 (10 mg/kg/dose) or placebo (dimethyl sulfoxide, equal volume) by daily i.p. injection from postnatal day 5 to 15. Alveolarization, vascular development, and pulmonary hypertension (PH) were analyzed. RESULTS:Administration of ICG001 significantly downregulated expression of cyclin D1, collagen 1a1, and fibronectin, which are the known target genes of β-catenin signaling in CTGF lungs. Inhibition of β-catenin signaling improved alveolar and vascular development and decreased pulmonary vascular remodeling. More importantly, the improved vascular development and vascular remodeling led to a decrease in PH. CONCLUSION:β-Catenin signaling mediates the autocrine and paracrine effects of CTGF in the neonatal lung. Inhibition of CTGF-β-catenin signaling may provide a novel therapy for BPD.

journal_name

Pediatr Res

journal_title

Pediatric research

authors

Rong M,Chen S,Zambrano R,Duncan MR,Grotendorst G,Wu S

doi

10.1038/pr.2016.52

subject

Has Abstract

pub_date

2016-07-01 00:00:00

pages

136-44

issue

1

eissn

0031-3998

issn

1530-0447

pii

pr201652

journal_volume

80

pub_type

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