A study of World Trade Center responders has identified a possible connection between post-traumatic stress disorder (PTSD) and molecular changes that indicate accelerated biological aging. The research, which analyzed blood samples from 393 first responders nearly two decades after the September 11, 2001 attacks, also suggests an association with a higher risk of chronic diseases.
Researchers from Stony Brook University in New York observed significant differences in 114 proteins and seven metabolites between responders diagnosed with PTSD and those without. These alterations were found in blood markers related to brain function, immune activity, energy metabolism, cell protection, and cellular communication and tissue repair.
The findings revealed signs of accelerated biological aging in multiple organs, including the heart, kidneys, liver, and lungs, among responders with PTSD. These molecular changes could help explain the increased likelihood of chronic conditions such as heart disease, lung disease, cognitive decline, and other age-related illnesses observed in individuals with long-term PTSD.
Lead study author Benjamin Luft, director of the Stony Brook WTC Wellness Program, stated that chronic PTSD is associated with lasting biological changes affecting various body systems for decades following traumatic exposure. He emphasized that these changes appear to accelerate aspects of biological aging and may elevate the risk of numerous chronic diseases, reinforcing the understanding of PTSD as a "whole-body illness."
The study also identified alterations in several proteins crucial for healthy brain function in those with PTSD. These proteins play key roles in brain cell communication, damage repair, and maintaining connections vital for memory and cognitive processes.
The research, supported in part by the CDC, the National Institute for Occupational Safety, and the National Institutes of Health, was published in Nature Communications. While acknowledging the findings as compelling evidence, researchers cautioned that as all measurements were taken at a single point in time, the study can only show an association, not a direct causal link between PTSD and these changes. Further studies are underway to examine whether these molecular alterations precede clinical changes.
Additionally, the researchers noted that the findings might not be generalizable to all individuals with PTSD, as the study focused on a unique population of WTC responders with specific trauma and environmental exposures. Women were also underrepresented, making up only 10% of the responders.
Dr. Marc Siegel, a senior medical analyst not involved in the study, described the results as fascinating, suggesting they highlight the complex interplay between emotional and physical trauma in PTSD, leading to immune dysregulation and aging processes. He noted that the chronic diseases observed post-9/11 were conjoined in their impact on physical and emotional well-being, longevity, and multiple organ systems.
From a public health perspective, the study underscores the importance of recognizing PTSD as a chronic medical condition with significant long-term health implications. Luft suggested that investing in early diagnosis, comprehensive treatment, and long-term follow-up for trauma survivors could improve quality of life and reduce the burden of chronic disease.