The pilot study, published in the peer-reviewed journal Experimental Biology and Medicine in September 2021, found that increased blood levels of a specific protein—called plasma osteopontin (OPN)—were found in children with severe cases of COVID-19 and Multisystem Inflammatory Syndrome (MIS-C). Let’s take a look at how these findings may help doctors treat kids before acute symptoms and hospitalizations occur.
What is OPN, and Why Is it Important?
Firstly, osteopontin is a protein found in human body fluids. Studies have shown that there is an increased amount in malignancies (abnormal cells that divide and spread throughout the body uncontrollably) and that it can stimulate some cancerous cells. Levels of plasma OPN have been linked to tumors and are also associated with significant injuries. “We found that children with more severe injury to the brain have higher levels of osteopontin, potentially indicating more severe neurological disease and inflammation response to injury,” says Laura Blackwell, PhD, a senior neuropsychologist at Children’s Healthcare of Atlanta, and a co-author of the study. Dr. Blackwell notes that armed with this knowledge, researchers believe that children with severe COVID-19 symptoms and the neurological effects from MIS-C may also have elevated levels of the protein. The study at hand indicates that the ability to track the increased presence of OPN may help doctors know how serious a child’s COVID-19 illness will become, and what level of care may be needed. “If a child is suspected of having COVID-19 and receives a positive test, then their blood can be tested at that point of care to evaluate their levels of plasma osteopontin immediately following the positive test,” says Andrew Reisner, MD, medical director of neurotrauma and a pediatric neurosurgeon at Children’s Healthcare of Atlanta. Dr. Reisner is the lead author of the study.
All About the Study
Researchers with Children’s Healthcare of Atlanta collected pediatric blood samples from 26 participants from March 17 to May 26, 2020. The randomly-selected kids ranged from newborn to 21 years old. They were grouped according to the level of their COVID-19 illness: mild or symptomatic, moderate, or severe. Researchers then analyzed the amount of plasma osteopontin in the blood samples and were able to equate the severity of the COVID-19 illness with the amount of OPN found. “The severe COVID-19 and MIS-C groups had significantly higher levels of osteopontin at the time of collection compared to the other two groups,” explains Dr. Reisner. “This study demonstrates with statistical significance that plasma osteopontin levels obtained on hospital admission are related to the clinical severity of COVID-19 in children, with the highest levels noted in children with MIS-C.” Experts note that OPN levels elevate as an inflammatory response to a fall, injury, or trauma. Since COVID-19 can cause inflammation, the heightened OPN levels could serve as a biomarker of COVID-19 and MIS-C in children. These markers can help medical professionals diagnose ailments, such as COVID-19, and/or their severity. “[The study] adds to an increasing body of work showing possible biomarkers for MIS-C that may help doctors recognize this condition early and treat patients before they become critically ill,” states Grant Schulert, MD, PhD, an assistant professor of pediatrics in the division of rheumatology at Cincinnati Children’s Hospital Medical Center.
Outlook For Future Care
The study authors acknowledge that larger sample sizes and longer testing time frames would strengthen the findings. The hope, however, is that this initial discovery could lead medical personnel on a path to more successful outcomes for children in the fight against COVID-19. “Our study results show that children with more severe COVID-19 infection and symptoms and possibly with more complicated neurological disease may be able to be identified earlier on with the support of this novel biomarker, which could lead to earlier interventions and treatments,” Dr. Blackwell concludes.
