Mitochondria-Dependent Metabolic Reprogramming Enhances Myofibroblast Differentiation and Aggravates...

Area of Science:

• Mitochondrial Biology
• Pulmonary Medicine
• Cellular Differentiation

Background:

• Idiopathic pulmonary fibrosis (IPF) is a progressive lung disease with irreversible fibrosis.
• Aberrant cell differentiation is implicated in IPF pathogenesis.
• The role of mitochondrial dysfunction in IPF fibrosis development requires clarification.

Purpose of the Study:

• To investigate the impact of mitochondrial dysfunction on lung cell differentiation and pulmonary fibrosis.
• To utilize mito-mice ND6^M with impaired respiratory chain complex I activity.

Main Methods:

• Induced pulmonary fibrosis using bleomycin (BLM) in wild-type and mito-mice ND6^M.
• Analyzed bone marrow-derived macrophages for M1/M2 polarization.
• Evaluated myofibroblast differentiation in primary lung fibroblasts.

Main Results:

• Mito-mice ND6^M showed more severe fibrosis and lower survival rates post-BLM.
• Increased lung lactate production was observed in mito-mice ND6^M after BLM.
• Mitochondrial dysfunction enhanced TGF-β1-induced myofibroblast differentiation and serine-glycine pathway enzyme expression.

Conclusions:

• Mitochondrial dysfunction exacerbates bleomycin-induced pulmonary fibrosis.
• Mitochondrial dysfunction promotes TGF-β1-induced myofibroblast differentiation.
• Mitochondria-dependent metabolic reprogramming is a potential therapeutic strategy for IPF.