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The role of vitamin E in T-cell differentiation and the decrease of cellular immunity with aging

S Moriguchi1, M Hamada, K Yamauchi

  • 1Department of Nutrition, University of Tokushima School of Medicine, Japan.

The Journal of Medical Investigation : JMI
|December 29, 1998
PubMed
Summary
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High vitamin E intake boosts thymic lymphocyte proliferation and T-cell differentiation in aging rats. This suggests vitamin E enhances cellular immunity, potentially improving health in older individuals.

Area of Science:

  • Immunology
  • Nutrition Science
  • Aging Research

Background:

  • Aging leads to decreased thymic lymphocyte proliferation and T-cell differentiation.
  • Spontaneously hypertensive rats (SHR) serve as a model for studying aging-related immune decline.
  • Vitamin E is an antioxidant with potential immunomodulatory effects.

Purpose of the Study:

  • To investigate the effect of high vitamin E diet on thymic lymphocyte proliferation and T-cell differentiation in aging rats.
  • To elucidate the mechanism by which vitamin E influences T-cell differentiation in the thymus.

Main Methods:

  • Spontaneously hypertensive rats (SHR) and Wistar Kyoto rats (WKY) were fed regular or high vitamin E diets.
  • Flow cytometry was used to analyze T-cell populations (CD4, CD8) and thymocyte differentiation.

Related Experiment Videos

  • Fisher rats were used to assess the impact of varying vitamin E intake on T-cell differentiation and thymic epithelial cell (TEC) function.

    • Main Results:

    • High vitamin E diet significantly enhanced thymic lymphocyte proliferation in SHR, restoring it to levels seen in WKY rats.
    • Vitamin E supplementation improved the expression of CD4 and CD8 antigens on immature T cells (CD4+CD8+) in SHR.
    • High vitamin E intake increased percentages of CD4+CD8- and CD4-CD8+ T cells in thymocytes, indicating enhanced T-cell differentiation.
    • Vitamin E improved TEC function, increasing their binding capacity to immature T cells via ICAM-1 expression.

    Conclusions:

    • High vitamin E diet enhances thymic lymphocyte proliferation and T-cell differentiation in aging rats.
    • Vitamin E promotes T-cell differentiation primarily by improving thymic epithelial cell function.
    • Vitamin E is a potential nutrient for improving age-related decline in cellular immunity.