The long non-coding RNA Snhg15 protects the heart after myocardial infarction

Area of Science:

• Cardiology
• Molecular Biology
• Genetics

Background:

• Cardiomyocytes are terminally differentiated cells that do not divide.
• Loss of cardiomyocytes after myocardial infarction leads to fibrotic scarring and impaired cardiac function.
• Understanding cardiomyocyte death mechanisms is crucial for developing heart failure therapies.

Purpose of the Study:

• To investigate the molecular mechanisms governing cardiomyocyte death in heart failure.
• To identify key molecular players involved in heart failure-induced cell death.
• To explore the therapeutic potential of targeting specific molecules for cardiomyocyte protection.

Main Methods:

• Combined heart failure transcriptomics with in vitro cell assays.
• Conducted loss-of-function studies using HL-1 cardiomyocyte-like cells.
• Utilized adeno-associated virus delivery for in vivo gene therapy in a myocardial infarction model.

Main Results:

• Reduced gene expression of the long non-coding RNA (lncRNA) small nucleolar RNA host gene 15 (Snhg15) was identified as a hallmark of ischemic and dilated heart failure.
• Snhg15 depletion in HL-1 cells led to nucleolar disruption and cell death via a p53-dependent pathway.
• Adeno-associated virus-mediated delivery of Snhg15 prior to myocardial infarction partially preserved cardiac function in both acute and chronic phases.

Conclusions:

• Snhg15 acts as a critical regulator of cardiomyocyte cell death in the context of heart failure.
• The lncRNA Snhg15 shows potential as a therapeutic agent to mitigate cardiomyocyte loss.
• Targeting Snhg15 may offer a novel strategy for treating heart failure and improving cardiac outcomes.