Long Noncoding RNA FENDRR Inhibits Lung Fibroblast Proliferation via a Reduction of β-Catenin

Area of Science:

• Molecular Biology
• Cell Biology
• Pulmonary Medicine

Background:

• Idiopathic Pulmonary Fibrosis (IPF) is a fatal lung disease characterized by fibroblast proliferation.
• Long noncoding RNAs (lncRNAs) are increasingly recognized for their roles in disease pathogenesis.

Purpose of the Study:

• To investigate the role of lncRNA FENDRR in regulating fibroblast proliferation.
• To elucidate the molecular mechanisms by which FENDRR affects lung fibrosis.

Main Methods:

• Overexpression and silencing of FENDRR in human lung fibroblasts.
• Investigated interactions with SRS9 and downstream signaling pathways (mTOR/PS6K, beta-catenin).
• Adenovirus-mediated FENDRR transfer in a mouse model of asbestos-induced lung fibrosis; RNA sequencing.

Main Results:

• FENDRR overexpression reduced, while silencing increased, fibroblast proliferation.
• FENDRR inhibited PS6K phosphorylation and reduced beta-catenin protein levels.
• FENDRR transfer reduced fibrotic lesions and collagen deposition in mice, reversing pro-fibrotic gene expression.

Conclusions:

• FENDRR functions as an anti-fibrotic lncRNA by inhibiting fibroblast proliferation.
• FENDRR's mechanism involves regulating SRS9, mTOR signaling, and beta-catenin.
• FENDRR holds potential as a therapeutic target for IPF.