Deprived neighbourhoods and depression symptoms associated with premature aging
Depression and living in a deprived urban neighbourhood may accelerate aging, says a new study led by researchers at McMaster University.
Researchers say that living in urban environments marked by material and social inequities and having depression symptoms were associated with premature biological aging, even after accounting for individual-level health and behavioural risk factors, such as chronic conditions and poor health behaviours. The study of how different environments and behaviours can affect genetic function and health is called epigenetics.
The study was published on June 5 in The Journals of Gerontology, Series A: Biological Sciences and Medical Sciences. The research team was led by Parminder Raina, professor of the Department of Health Research Methods, Evidence, and Impact (HEI), and also included investigators from Holland, Norway and Switzerland.
“Our study used two DNA methylation-based estimators, known as epigenetic clocks, to examine aging at the cellular level and estimate the difference between chronological age and biological age,” said Divya Joshi, the study’s first author and a research associate in the HEI.
“Our findings showed that neighbourhood deprivation and depressive symptoms were positively associated with acceleration of the epigenetic age estimated using the DNAm GrimAge clock. This adds to the growing body of evidence that living in urban areas with higher levels of neighbourhood deprivation and having depression symptoms are both associated with premature biological aging.”
Depressive symptoms in the study were measured using a 10-item standardized depression scale. Researchers found an acceleration in the risk of death by one month for every point increase on the depressive symptom score. They said that emotional distress caused by depression may result in more biological wear and tear and dysregulation of physiological systems, which may lead to premature aging.
Investigators assessed neighbourhood material and social deprivation using two indices that were developed by the Canadian Urban Environmental Health Research Consortium (CANUE) based on 2011 census.
Social deprivation reflects the presence of fewer social resources in the family and community, while material deprivation is an indicator of people’s inability to access the amenities of modern life, such as adequate housing, nutritious food, a car, high-speed internet, or a neighbourhood with recreational facilities.
The researchers found an increase in the risk of death by almost one year for those exposed to greater neighbourhood deprivation, compared to those in less-deprived areas.
The study did not find that neighbourhood deprivation amplified the effect of depressive symptoms on epigenetic age acceleration.
“Our results showed that the effect of neighbourhood deprivation on epigenetic age acceleration was similar regardless of depression symptoms, suggesting that depression influences epigenetic age acceleration through mechanisms unrelated to neighbourhood deprivation,” Joshi said.
The research examined epigenetic data from 1,445 participants enrolled in the Canadian Longitudinal Study on Aging (CLSA), a research platform following more than 50,000 participants who were between the ages of 45 to 85 when recruited.
“Longitudinal studies, like the CLSA, are important to confirm associations like those found in this study,” said Raina, the study’s senior author and lead principal investigator of the CLSA.
“By following the same group of participants for 20 years, we will be able to determine whether epigenetic changes are stable or reversible over time. We will also gain insight into the mechanisms that are leading to accelerated epigenetic aging.”
Support for the CLSA is provided by the Government of Canada through the Canadian Institutes of Health Research and the Canada Foundation for Innovation. Additional support for this study was provided by the European Union’s Horizon 2020 Programme.
The full study can be accessed here.
Research Findings