Long non-coding RNAs link extracellular matrix gene expression to ischemic cardiomyopathy

Area of Science:

• Cardiovascular Biology
• Molecular Biology
• Genomics

Background:

• Ischemic cardiomyopathy (ICM) is a primary cause of heart failure (HF).
• Long non-coding RNAs (lncRNAs) are increasingly recognized for their roles in biological processes, but their function in HF is largely unexplored.
• Understanding lncRNA regulation in diseased hearts is crucial for advancing HF research.

Purpose of the Study:

• To investigate the differential expression and functional roles of lncRNAs in the context of ICM.
• To test the hypothesis that lncRNA expression and function are altered in hearts affected by ICM.

Main Methods:

• RNA deep sequencing was performed on cardiac samples from patients with ICM (n=15) and controls (n=15).
• Genome-wide transcriptome analysis identified differentially expressed lncRNAs and their correlation with protein-coding genes.
• In vitro experiments involved overexpression and knockdown of selected lncRNAs in cardiac fibroblasts.

Main Results:

• 145 differentially expressed lncRNAs were identified in ICM hearts, with 35 showing strong positive expression correlation.
• A significant association was found between lncRNAs and extracellular matrix (ECM) protein-coding genes.
• lncRNAs were demonstrated to regulate fibrosis, ECM synthesis gene expression, and myofibroblast differentiation, partly through the TGF-β pathway.

Conclusions:

• lncRNA expression is dynamically regulated in ICM.
• lncRNAs play a critical role in regulating ECM function and cardiac fibrosis during ICM development.
• lncRNAs represent potential novel therapeutic targets for heart function regulation and cardiac disorders like ICM.