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Cell competition drives bronchiolization and pulmonary fibrosis
Rachel Warren1, Kylie Klinkhammer1, Handeng Lyu1
1Department of Medicine, Division of Pulmonary and Critical Medicine, Mayo Clinic, Rochester, MN, USA.
Nature Communications
|December 5, 2024
Summary
Idiopathic pulmonary fibrosis (IPF) involves lung stem cell malfunction. Our study reveals that controlling Myc levels in lung stem cells can direct their differentiation, potentially treating IPF by promoting gas-exchange cell formation.
Area of Science:
- Cell Biology
- Pulmonary Medicine
- Stem Cell Biology
Background:
- Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease characterized by aberrant stem cell differentiation.
- Lung stem cell fate is crucial for maintaining alveolar structure and function.
Purpose of the Study:
- To investigate the role of Hippo and Wnt/β-catenin signaling pathways in lung stem cell differentiation.
- To understand how Myc expression influences stem cell fate in the context of IPF.
Main Methods:
- Analysis of Hippo pathway activators and β-catenin signaling in lung stem cells.
- Investigating the impact of Myc and Yap on stem cell differentiation pathways.
- Observing stem cell behavior and differentiation in response to signaling modulation.
Main Results:
- Healthy lungs maintain stem cells via tonic Hippo/β-catenin signaling, promoting Yap/Taz degradation and low Myc expression.
- Inactivating Hippo pathway activators promotes stem cell differentiation into alveolar type 1 (AT1) cells.
- Elevated Myc, with Yap, drives stem cells toward basal/myoepithelial lineages, causing lung remodeling.
Conclusions:
- Myc levels critically determine lung stem cell fate, distinguishing between differentiation into AT1 cells or promoting fibrotic remodeling.
- Modulating Myc and associated signaling pathways offers a potential therapeutic strategy for IPF by guiding stem cell differentiation.
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