Functional Effects of Cardiomyocyte Injury in COVID-19.

Area of Science:

• Cardiology
• Virology
• Cell Biology

Background:

• COVID-19 is known to affect multiple organs, including the heart.
• Cardiac dysfunction is observed in COVID-19 patients, even those without pre-existing heart conditions.
• The mechanisms underlying COVID-19-related cardiac disease are not fully understood.

Purpose of the Study:

• To investigate the direct effects of SARS-CoV-2 infection and associated interleukins on human cardiomyocytes.
• To identify potential mechanisms linking viral infection to cardiac dysfunction in COVID-19 patients.
• To correlate laboratory findings with clinical observations of heart injury in COVID-19.

Main Methods:

• Human induced pluripotent stem cell-derived cardiomyocytes (hiPSC-CMs) were infected with SARS-CoV-2.
• Experiments were conducted in the absence and presence of inflammatory interleukins (IL-6, IL-1β).
• Cellular and physiological analyses included assessing multinucleation, myofibril organization, troponin release, contractile function, and gene expression. Clinical data from COVID-19 patients were integrated.

Main Results:

• SARS-CoV-2 infection of hiPSC-CMs led to multinucleation and myofibril disorganization.
• Viral infection and interleukins caused extracellular release of troponin I and impaired cardiomyocyte beating.
• Interleukins exacerbated contractile dysfunction without increasing viral infection extent.
• Clinical data showed elevated troponin and interleukin levels, with reduced left ventricular function in some COVID-19 patients.

Conclusions:

• Direct injury to cardiomyocytes by SARS-CoV-2 infection and inflammatory interleukins may cause cardiac dysfunction in COVID-19.
• The observed cellular changes correlate with clinical findings of heart injury and reduced cardiac function in patients.
• This study suggests a direct pathogenic mechanism for heart disease in COVID-19.