Targeting Mitochondrial Dysfunction With LncRNAs in a Wistar Rat Model of Chronic Obstructive Pulmonary Disease

Area of Science:

• Pulmonary Medicine
• Molecular Biology
• Environmental Health

Background:

• Chronic obstructive pulmonary disease (COPD) is a significant global health concern.
• Cigarette smoking (CS) and fine particulate matter (PM2.5) are key environmental risk factors contributing to COPD development.
• Aberrant long non-coding RNA (lncRNA) profiles are implicated in the pathogenesis of COPD.

Purpose of the Study:

• To investigate and characterize the differential expression of lncRNAs in rat models of COPD induced by CS and PM2.5.
• To explore the correlation between altered lncRNAs and messenger RNA (mRNA) pathways, focusing on mitochondrial dysfunction and inflammation.
• To construct a coding-non-coding gene co-expression network (CNC) for a deeper understanding of COPD molecular mechanisms.

Main Methods:

• Development of COPD rat models exposed to either CS (CSM) or PM2.5 (PMM).
• RNA extraction from lung tissues followed by microarray analysis to identify differentially expressed lncRNAs and mRNAs.
• Gene Ontology (GO) and Kyoto Encyclopaedia of Genes and Genomes (KEGG) pathway analyses to determine functional associations.
• Quantitative real-time reverse transcription PCR (qRT-PCR) for lncRNA expression validation.
• Construction of a CNC network linking lncRNAs and mRNAs involved in key pathological processes.

Main Results:

• Microarray analysis revealed significant alterations in lncRNA and mRNA expression in both PMM and CSM groups compared to controls.
• PMM exposure resulted in 123 upregulated and 444 downregulated lncRNAs, alongside 621 upregulated and 1,178 downregulated mRNAs.
• CSM exposure led to 81 upregulated and 340 downregulated lncRNAs, and 408 upregulated and 931 downregulated mRNAs.
• GO and KEGG analyses confirmed the involvement of inflammatory responses and mitochondrial dysfunction in the COPD models.

Conclusions:

• Specific lncRNAs, including decreased XR_340674, ENSRNOT00000089642, XR_597045, XR_340651, and increased XR_592469, were identified.
• These identified lncRNAs are significantly associated with mitochondrial dysfunction in lung tissues of rats exposed to CS or PM2.5.
• The findings highlight the role of specific lncRNAs in the molecular pathology of environmentally induced COPD.