© UNC School of MedicineThis is the study's senior author, Samuel McLean, M.D., M.P.H., University of North Carolina School of Medicine.
A new study led by University of North Carolina School of Medicine researchers is the first to identify a genetic risk factor for persistent pain after traumatic events such as motor vehicle collision and sexual assault.
In addition, the study contributes further evidence that persistent pain after stressful events, including motor vehicle collisions and sexual assaults, has a specific biological basis. A manuscript of the study was published online ahead of print by the journal
Pain on April 29.
"Our study findings indicate that mechanisms influencing chronic pain development may be related to the stress response, rather than any specific injury caused by the traumatic event," said Samuel McLean, MD, MPH, senior author of the study and assistant professor of anesthesiology. "In other words, our results suggest that in some individuals something goes wrong with the body's 'fight or flight' response or the body's recovery from this response, and persistent pain results."
The study assessed the role of the hypothalamic-pituitary adrenal (HPA) axis, a physiologic system of central importance to the body's response to stressful events. The study evaluated whether the HPA axis influences musculoskeletal pain severity six weeks after motor vehicle collision (MVC) and sexual assault. Its findings revealed that variation in the gene encoding for the protein FKBP5, which plays an important role in regulating the HPA axis response to stress, was associated with a 20 percent higher risk of moderate to severe neck pain six weeks after a motor vehicle collision, as well as a greater extent of body pain. The same variant also predicted increased pain six weeks after sexual assault.