Wheezing after acquisition on the treadmill. Swallow air while doing housework. Shortness of breath is one of the many frightening and frustrating symptoms that can linger in Covid patients months after the initial infection. Scientists are slowly figuring out what causes it, and are getting closer to finding a cure.
In a recently published paper, European Respiratory Journal, researchers at the University of Manchester, UK, have identified the likely culprit to be immune cells known as monocytes. look for Upon encountering an invading pathogen such as a bacterium or virus, it generates other vital immune cells to alert the immune system and activate additional defenses. Monocytes are particularly important during lung injury. At the first sign of trouble, they migrate to the lungs and produce a variety of specialized macrophages (immune cells that feed on pathogens). Macrophages are the first line of immune defense against invading bacteria.
However, it seems that Covid infection can really disrupt the work of these immune cells. That is, “they may react abnormally to subsequent events,” says Lawrence Piamain, a clinical lecturer at the University of Manchester and co-author of the paper. In Covid patients with persistent shortness of breath after infection, researchers found irregular monocytes. Compared to healthy people, these patients have varying levels of protein attached to their monocytes, which is important for targeting the cells to the lungs. have been linked to long-term COVID-19 and lung injury, paving the way for potential therapies to modify the disorder or alleviate symptoms.
Piermain and team had good reason to suspect these cells. Other researchers had already found that SARS-CoV-2 affects monocytes. According to Judy Lieberman, a biologist at Harvard Medical School, in severe cases of COVID-19, virus-infected monocytes die off, releasing large amounts of alarm molecules into the body and releasing large amounts of additional toxins into the body. It often causes inflammation. “It’s like a feedforward loop for her,” she says. “Once this sets in, it’s very difficult to control.” Shows potential roles.
Piermain and the team decide to investigate. To understand exactly what these cells were doing during Covid-19, scientists turned to blood sampling, starting in the summer of 2020 in several UK hospitals. Piermain and team collected blood from 71 of his patients during Covid hospitalizations. Over the next few months, they also collected blood from 142 separate patients previously hospitalized with Covid and collected samples during follow-up visits.
The patient being followed up had been infected with Covid about 6 months earlier, and by this time post-infection, the immune dysfunction caused by the virus is expected to have subsided. It wasn’t what the team saw. “It was clear that many people were still really suffering from shortness of breath, fatigue, and many other long-lasting symptoms of Covid,” he says. 48% reported shortness of breath and 44% reported fatigue. Now that the team has found his Covid-his cohort long to study, it’s time to take a closer look at their immune cells.
