A recent stem cell study has shown that SARS-CoV-2, the novel coronavirus, can infect heart cells via the same receptor present in the lungs. This may be responsible for the cardiac complications associated with COVID-19.
Experts initially thought that COVID-19 was a respiratory disease, with symptoms including cough, shortness of breath, and pneumonia. However, more recent evidence into COVID-19 shows that the disease can also cause neurological and cardiac symptoms.
Physicians have reported changes to the circulatory system in people with COVID-19, sometimes leading to blood clots, as well as cardiac complications, such as changes to the heart rhythm, damage to heart tissue, and heart attacks.
Although there is widespread agreement that COVID-19 is a risk to the heart, whether these symptoms are due to the virus directly or a consequence of other disease processes, such as inflammation, has been unclear.
Stay informed with live updates on the current COVID-19 outbreak and visit our coronavirus hub for more advice on prevention and treatment.
In a new study appearing in the journal Cell Reports Medicine, scientists have helped resolve this mystery by showing that SARS-CoV-2 can infect heart cells and change their function.
Their findings, from experiments in human stem cells, suggest that the cardiac symptoms of COVID-19 may be the direct result of the infection of heart tissue.
The scientists used a type of stem cell called induced pluripotent stem cells (iPSCs) to generate heart cells.
Scientists can create iPSCs from a persons skin cells and then reprogram them to become any cell type in the body. They provide a useful tool for research into human disease and a way to test new treatments.
In this study, the team programmed the iPSCs to become heart cells and later incubated them with SARS-CoV-2. Using microscopes and genetic sequencing techniques, the researchers found that SARS-CoV-2 could directly infect the heart cells.
They also showed that the virus can rapidly divide inside heart cells, which caused changes to the hearts ability to beat after a period of under 3 days.
We not only uncovered that these stem cell-derived heart cells are susceptible to infection by [the] novel coronavirus, but that the virus can also quickly divide within the heart muscle cells, explains first study author Dr. Arun Sharma, a research fellow at the Regenerative Medicine Institute of Cedars-Sinai Medical Center in Los Angeles, CA.
Additional experiments focused on the different genes expressed by heart cells before and after the virus infected them. These studies showed activation of the innate immune response and antiviral clearance pathways to help fight the virus.
However, how does the virus get into the heart in the first place? The researchers suggest that one way in which it gains access may be by using angiotensin-converting enzyme 2 (ACE2). This is the same receptor the virus uses to infect cells in the lungs.
Importantly, studies have shown that treatment with an ACE2 antibody can help stop SARS-CoV-2 from replicating and save cells in the heart.
By blocking the ACE2 protein with an antibody, the virus is not as easily able to bind to the ACE2 protein, and thus cannot easily enter the cell. This not only helps us understand the mechanisms of how this virus functions, but also suggests therapeutic approaches that could be used as a potential treatment for SARS-CoV-2 infection.
Dr. Arun Sharma
The researchers suggest that scientists could use stem cell-derived heart cells to screen new drugs and find compounds able to stop the infection of heart cells.
This key experimental system could be useful to understand the differences in disease processes of related coronaviral pathogens SARS and MERS, adds study author Dr. Vaithilingaraja Arumugaswami, an associate professor at the University of California, Los Angeles.
There are some limitations to this approach, however. These include the fact that stem cell-derived heart cells are not exactly the same as the real thing.
The researchers also studied the cells in a dish, an isolated system lacking the immune interactions that would occur in the human body.
Nevertheless, the experiments clearly showed that the cells became infected with SARS-CoV-2, which is in line with some clinical data showing the virus in the hearts of people who died from COVID-19.
For live updates on the latest developments regarding the novel coronavirus and COVID-19, click here.
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COVID-19 could directly affect the heart - Medical News Today
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