Social Stressors Associated with Age-related T Lymphocyte Percentages in Older US Adults: Evidence from the US Health and Retirement Study

Overview

Journal Proc Natl Acad Sci U S A

Specialty Science

Date 2022 Jun 13

PMID 35696572

Authors

Eric T Klopack

Eileen M Crimmins

Steve W Cole

Teresa E Seeman

Judith E Carroll

Affiliations

Soon will be listed here.

Abstract

Exposure to stress is a risk factor for poor health and accelerated aging. Immune aging, including declines in naïve and increases in terminally differentiated T cells, plays a role in immune health and tissue specific aging, and may contribute to elevated risk for poor health among those who experience high psychosocial stress. Past data have been limited in estimating the contribution of life stress to the development of accelerated immune aging and investigating mediators such as lifestyle and cytomegalovirus (CMV) infection. This study utilizes a national sample of 5,744 US adults over age 50 to assess the relationship of social stress (viz., everyday discrimination, stressful life events, lifetime discrimination, life trauma, and chronic stress) with flow cytometric estimates of immune aging, including naïve and terminally differentiated T cell percentages and the ratio of CD4 to CD8 cells. Experiencing life trauma and chronic stress was related to a lower percentage of CD4 naïve cells. Discrimination and chronic stress were each associated with a greater percentage of terminally differentiated CD4 cells. Stressful life events, high lifetime discrimination, and life trauma were related to a lower percentage of CD8 naïve cells. Stressful life events, high lifetime discrimination, and chronic stress were associated with a higher percentage of terminally differentiated CD8 cells. High lifetime discrimination and chronic stress were related to a lower CD4:CD8 ratio. Lifestyle factors and CMV seropositivity partially reduced these effects. Results identify psychosocial stress as a contributor to accelerating immune aging by decreasing naïve and increasing terminally differentiated T cells.

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