In recent years, public health concerns about post-traumatic stress disorder (PTSD) have risen significantly, driven in part by affected military veterans returning from conflicts in the Middle East and elsewhere. PTSD is associated with number of psychological maladies, among them chronic depression, anger, insomnia, eating disorders and substance abuse.
Writing in the May 7 online issue of American Journal of Geriatric Psychiatry, researchers at University of California, San Diego School of Medicine and Veterans Affairs San Diego Healthcare System suggest that people with PTSD may also be at risk for accelerated aging or premature senescence.
“This is the first study of its type to link PTSD, a psychological disorder with no established genetic basis, which is caused by external, traumatic stress, with long-term, systemic effects on a basic biological process such as aging,” said Dilip V. Jeste, MD, Distinguished Professor of Psychiatry and Neurosciences and director of the Center on Healthy Aging and Senior Care at UC San Diego, who is the senior author of this study.
Researchers had previously noted a potential association between psychiatric conditions, such as schizophrenia and bipolar disorder, and acceleration of the aging process. Jeste and colleagues determined to see if PTSD might show a similar association by conducting a comprehensive review of published empirical studies relevant to early aging in PTSD, covering multiple databases going back to 2000.
There is no standardized definition of what constitutes premature or accelerated senescence. For guidance, the researchers looked at early aging phenomena associated with non-psychiatric conditions, such as Hutchinson-Gilford progeria syndrome, HIV infection and Down’s syndrome. The majority of evidence fell into three categories: biological indicators or biomarkers, such as leukocyte telomere length (LTL), earlier occurrence or higher prevalence of medical conditions associated with advanced age and premature mortality.
In their literature review, the UC San Diego team identified 64 relevant studies; 22 were suitable for calculating overall effect sizes for biomarkers, 10 for mortality.
All six studies looking specifically at LTL found reduced telomere length in persons with PTSD. Leukocytes are white blood cells. Telomeres are stretches of protective, repetitive nucleotide sequences at the ends of chromosomes. These sequences shorten with every cell replication and are considered a strong measure of the aging process in cells.
The scientists also found consistent evidence of increased pro-inflammatory markers, such as C-reactive protein and tumor necrosis factor alpha, associated with PTSD.
A majority of reviewed studies found increased medical comorbidity of PTSD with several targeted conditions associated with normal aging, including cardiovascular disease, type 2 diabetes, gastrointestinal ulcer disease and dementia.
Seven of 10 studies indicated a mild-to-moderate association of PTSD with earlier mortality, consistent with an early onset or acceleration of aging in PTSD.
“These findings do not speak to whether accelerated aging is specific to PTSD, but they do argue the need to re-conceptualize PTSD as something more than a mental illness,” said first author James B. Lohr, MD, professor of psychiatry. “Early senescence, increased medical morbidity and premature mortality in PTSD have implications in health care beyond simply treating PTSD symptoms. Our findings warrant a deeper look at this phenomenon and a more integrated medical-psychiatric approach to their care.”
Barton Palmer, PhD, professor of psychiatry and a coauthor of the study, cautioned that “prospective longitudinal studies are needed to directly demonstrate accelerated aging in PTSD and to establish underlying mechanisms.”
Other co-authors include Carolyn A. Eidt, Smitha Aailaboyina, and Steven R. Thorp, Veterans Affairs San Diego Healthcare System Center of Excellence for Stress and Mental Health and UCSD Department of Psychiatry and Stein Institute for Research on Aging; Brent T. Mausbach, UCSD Department of Psychiatry and Stein Institute for Research on Aging; and Owen M. Wolkowitz, UC San Francisco.
Funding: Funding for this research came, in part, from the Veterans Affairs San Diego Healthcare System Center of Excellence for Stress and Mental Health, National Institutes of Health grants R01MH099987, R01MH094151, T32MH019935, and U.S. Department of Defense, UC San Diego Center for Healthy Aging and Sam and Rose Stein Institute for Research on Aging.
Source: Scott LaFee – UCSD
Image Credit: The image is credited to NIH
Original Research: Abstract for “Is Post-Traumatic Stress Disorder Associated with Premature Senescence? A Review of the Literature” by James B. Lohr, Barton W. Palmer, Carolyn A. Eidt, Smitha Aailaboyina, Brent T. Mausbach, Owen M. Wolkowitz, Steven R. Thorp, and Dilip V. Jeste in American Journal of Geriatric Psychiatry. Published online May 7 2015 doi:10.1016/j.jagp.2015.04.001
Is Post-Traumatic Stress Disorder Associated with Premature Senescence? A Review of the Literature
Post-traumatic stress disorder (PTSD) has major public health significance. Evidence that PTSD may be associated with premature senescence (early or accelerated aging) would have major implications for quality of life and healthcare policy. We conducted a comprehensive review of published empirical studies relevant to early aging in PTSD.
Our search included the PubMed, PsycINFO, and PILOTS databases for empirical reports published since the year 2000 relevant to early senescence and PTSD, including: 1) biomarkers of senescence (leukocyte telomere length [LTL] and pro-inflammatory markers), 2) prevalence of senescence-associated medical conditions, and 3) mortality rates.
All six studies examining LTL indicated reduced LTL in PTSD (pooled Cohen’s d = 0.76). We also found consistent evidence of increased pro-inflammatory markers in PTSD (mean Cohen’s ds), including C-reactive protein = 0.18, Interleukin-1 beta = 0.44, Interleukin-6 = 0.78, and tumor necrosis factor alpha = 0.81. The majority of reviewed studies also indicated increased medical comorbidity among several targeted conditions known to be associated with normal aging, including cardiovascular disease, type 2 diabetes mellitus, gastrointestinal ulcer disease, and dementia. We also found seven of 10 studies indicated PTSD to be associated with earlier mortality (average hazard ratio: 1.29).
In short, evidence from multiple lines of investigation suggests that PTSD may be associated with a phenotype of accelerated senescence. Further research is critical to understand the nature of this association. There may be a need to re-conceptualize PTSD beyond the boundaries of mental illness, and instead as a full systemic disorder.
“Is Post-Traumatic Stress Disorder Associated with Premature Senescence? A Review of the Literature” by James B. Lohr, Barton W. Palmer, Carolyn A. Eidt, Smitha Aailaboyina, Brent T. Mausbach, Owen M. Wolkowitz, Steven R. Thorp, and Dilip V. Jeste in American Journal of Geriatric Psychiatry. Published online May 7 2015 doi:10.1016/j.jagp.2015.04.001