Tumor suppressors RBL1 and PTEN are epigenetically silenced in IPF mesenchymal progenitor cells by a CD44/Brg1/PRMT5 regulatory complex
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View abstract on PubMed
Summary
This summary is machine-generated.Idiopathic pulmonary fibrosis (IPF) mesenchymal progenitor cells evade self-renewal regulation by repressing tumor suppressor genes RBL1 and PTEN via a CD44/Brg1/PRMT5 module, driving fibrosis.
Area Of Science
- Pulmonary Medicine
- Cell Biology
- Epigenetics
Background
- Mesenchymal progenitor cells (MPCs) in idiopathic pulmonary fibrosis (IPF) lungs show sustained oncogenic signaling and fibrogenicity.
- A previously identified CD44/Brg1/PRMT5 module in IPF MPCs upregulates pluripotency and self-renewal genes.
Purpose Of The Study
- To investigate the mechanisms by which IPF MPCs escape negative regulation of self-renewal.
- To identify key molecular players involved in disabling tumor suppressor gene expression in IPF.
Main Methods
- Quantitative analysis of RBL1 and PTEN gene expression in IPF MPCs.
- Investigating the role of the CD44/Brg1/PRMT5 complex in epigenetic regulation of RBL1 and PTEN.
- Utilizing genetic knockdown and pharmacological inhibition of Brg1 and PRMT5.
- Assessing the impact on IPF MPC self-renewal in vitro and pulmonary fibrosis in vivo.
Main Results
- IPF MPCs exhibit decreased expression of tumor suppressor genes RBL1 and PTEN.
- The CD44/Brg1/PRMT5 complex mediates epigenetic repression of RBL1 and PTEN via H3R8 and H4R3 methylation.
- Inhibition of Brg1 or PRMT5 restored RBL1/PTEN expression, reduced IPF MPC self-renewal, and attenuated pulmonary fibrosis.
- The CD44/Brg1/PRMT5 module represses tumor suppressors, conferring cancer-like self-renewal to IPF MPCs.
Conclusions
- The CD44/Brg1/PRMT5 module is crucial for repressing RBL1 and PTEN in IPF MPCs.
- This repression promotes self-renewal and maintains a fibrogenic cell pool in IPF.
- Targeting this epigenetic mechanism offers a potential therapeutic strategy for IPF.
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