Investigating the mechanism by which telomere dysfunction affects mitochondrial homeostasis in anthracosilicosis...

Area of Science:

• Pulmonary Medicine
• Cellular Biology
• Toxicology

Background:

• Anthracosilicosis pathogenesis is unclear, but telomere dysfunction and mitochondrial imbalance are implicated in pulmonary fibrosis.
• Investigating the interplay between telomere function and mitochondrial homeostasis is crucial for understanding anthracosilicosis.

Purpose of the Study:

• To explore the regulatory role of telomere function in mitochondrial homeostasis.
• To assess the impact of telomere dysfunction on pulmonary fibrosis in anthracosilicosis using a telomerase RNA component (Terc) knockout mouse model.

Main Methods:

• Established anthracosilicosis and Terc knockout mouse models.
• Analyzed lung tissues for histopathology, collagen deposition, telomere length, TERT localization, mitochondrial ultrastructure, oxidative stress, and protein/gene expression.

Main Results:

• Terc knockout mice exposed to coal-silica dust showed shortened telomeres, dysregulated telomere-binding proteins, and impaired mitochondrial homeostasis.
• These mice exhibited increased oxidative damage, abnormal mitochondrial morphology, reduced ATP levels, and disrupted mitochondrial dynamics.
• Coal-silica dust exposure aggravated pulmonary fibrosis in Terc knockout mice.

Conclusions:

• Coal-silica dust exposure exacerbates telomere shortening and mitochondrial dysfunction in Terc knockout mice, promoting anthracosilicosis.
• Findings highlight the critical role of telomere function in maintaining mitochondrial homeostasis and preventing pulmonary fibrosis.
• Provides insights for developing targeted prevention and treatment strategies for pneumoconiosis.