Stress and telomere shortening among central Indian conservation refugees.

Author: Zahran S1, Snodgrass JG2, Maranon DG3, Upadhyay C4, Granger DA5, Bailey SM3.
1Department of Economics, Colorado State University, Fort Collins, CO 80523-1771; 2Department of Anthropology, Colorado State University, Fort Collins, CO 80523-1787; 3Department of Environmental and Radiological Health Sciences, Colorado State University, Fort Collins, CO 80523-1681; 4Department of Sociology, Government Postgraduate College, Pratapgarh, Rajasthan 312604, India; 5Institute for Interdisciplinary Salivary Bioscience Research, Arizona State University, Tempe, AZ 85287-1104; and School of Nursing and Bloomberg School of Public Health, Johns Hopkins University, Baltimore, MD 21205.
Conference/Journal: Proc Natl Acad Sci U S A.
Date published: 2015 Feb 17
Other: Pages: 201411902 , Word Count: 242

Research links psychosocial stress to premature telomere shortening and accelerated human aging; however, this association has only been demonstrated in so-called "WEIRD" societies (Western, educated, industrialized, rich, and democratic), where stress is typically lower and life expectancies longer. By contrast, we examine stress and telomere shortening in a non-Western setting among a highly stressed population with overall lower life expectancies: poor indigenous people-the Sahariya-who were displaced (between 1998 and 2002) from their ancestral homes in a central Indian wildlife sanctuary. In this setting, we examined adult populations in two representative villages, one relocated to accommodate the introduction of Asiatic lions into the sanctuary (n = 24 individuals), and the other newly isolated in the sanctuary buffer zone after their previous neighbors were moved (n = 22). Our research strategy combined physical stress measures via the salivary analytes cortisol and α-amylase with self-assessments of psychosomatic stress, ethnographic observations, and telomere length assessment [telomere-fluorescence in situ hybridization (TEL-FISH) coupled with 3D imaging of buccal cell nuclei], providing high-resolution data amenable to multilevel statistical analysis. Consistent with expectations, we found significant associations between each of our stress measures-the two salivary analytes and the psychosomatic symptom survey-and telomere length, after adjusting for relevant behavioral, health, and demographic traits. As the first study (to our knowledge) to link stress to telomere length in a non-WEIRD population, our research strengthens the case for stress-induced telomere shortening as a pancultural biomarker of compromised health and aging.
India; human displacement; indigenous peoples; stress; telomeres
PMID: 25730846