Colorado Boulder: '
Long COVID link to cortisol and hair-trigger stress response explored’
Excerpts:
'The study was funded by the nonprofit PolyBio Research Foundation'
'Proteins left behind by COVID-19 long after initial infection can cause cortisol levels in the brain to plummet, inflame the nervous system and prime its immune cells to hyper-react when another stressor arises, according to new animal research by CU Boulder scientists.’
'To explore just how such antigens impact the brain and nervous system, the research team injected an antigen called S1 (a subunit of the “spike” protein) into the spinal fluid of rats and compared them to a control group.'
'After seven days, levels of the cortisol-like hormone corticosterone plummeted by 31% in the hippocampus of rats exposed to S1. That is the region of the brain associated with memory, decision making and learning. After nine days, levels were down 37%.’
“We show for the first time that exposure to antigens left behind by this virus can actually change the immune response in the brain so that it overreacts to subsequent stressors or infection,” said Frank.’
'He theorizes that the process might go something like this: COVID antigens lower cortisol, which serves to keep inflammatory responses to stressors in check in the brain. Once a stressor arises—whether it be a bad day at work, a mild infection or a hard workout—the brain’s inflammatory response is unleashed without those limits and serious symptoms come screaming back.’
'Rooting out the source of antigens—including tissue reservoirs where bits of virus continue to hide out—might also be an approach worth exploring.'
“There are many individuals out there suffering from this debilitating syndrome. This research gets us closer to understanding what, neurobiologically, is going on and how cortisol may be playing a role,” said Frank.