Abstract P014: Associations of Depression, and Perceived Stress With Telomere Length in African Americans: The Minority Health Genomics and Translational Research Bio-Repository Database Study

Background: African Americans (AA) experience higher levels of psychological distress. Adverse psychological conditions and mental stress could be associated with accelerated cellular aging, evidenced by shortened leukocyte telomere length (TL), which could underlie this association. Hypothesis: In this study, we hypothesized that depressive symptoms and higher stress level would be associated with shorter telomere length in AA. We also hypothesized that the associations would be attenuated after adjusting for individual-level sociodemographic variable, various disease conditions, and lifestyle factors. Methods: The analysis included 225 women and 142 men aged 30-55 years from the Minority Health Genomics and Translational Research Bio-Repository Database Study. Relative TL (T/S ratio) was measured using quantitative polymerase chain reaction. The 20-item Center for Epidemiologic Studies Depression Scale and 14-item Perceived Stress Scale were used to assess the presence of depressive symptoms and perceived stress respectively. Summation of the scores and the Principal Component Analysis were performed for both the scales. Multivariable linear regression models were used to estimate mean differences in log T/S associated with depressive symptoms and perceived stress after adjusting for sociodemographic variable, various disease conditions, and lifestyle factors. Results: No evidence of association between stress and TL was observed. We found effect modification by hypertension affecting the association between depressive symptoms and log T/S. Depressive symptom, especially higher psychosomatic symptoms, was associated with increased TL in normotensive participants (β= 0.11 for mid-level psychosomatic symptoms and β= 0.12 for high-level psychosomatic symptoms; p value <0.05 for both). No association was observed in hypertensive participants. Conclusions: We found a positive association between psychosomatic depressive symptoms and TL, which do not support the hypothesis that depression is associated with shorter TL and aging in AA. Longitudinal studies with larger samples are needed to better understand and confirm this relationship.

Racial Differences in Neuropsychiatric Symptoms Among Dementia Patients: A Comparison of African Americans and Whites

Race is a critical sociodemographic variable that may serve as a marker for genetic, clinical, cultural, and socioeconomic factors. There have been several studies that found differences between African Americans and Whites in the neuropsychiatric symptoms of dementia. There have been fairly consistent findings that psychotic symptoms—hallucinations and delusions—are more prevalent among African American patients with dementia (Cohen & Carlin, 1993; Cooper et al., 1991, Deutsch et al., 1991; Fabrega et al., 1988), and that depression is higher among Whites than among African Americans (Fabrega et al., 1988; Walker et al., 1995). One study by Class and colleagues (1996) also suggested that behavioral disturbances might be higher among White than among African American nursing home patients, a majority of whom had dementia.