Age-Associated Changes in Immune Function: Impact of Vitamin E Intervention and the Underlying Mechanisms

Author(s): Dayong Wu , Simin N. Meydani .

Journal Name: Endocrine, Metabolic & Immune Disorders - Drug Targets

Volume 14 , Issue 4 , 2014

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Abstract:

Numerous studies have provided evidence suggesting that aging is associated with significant adverse changes in the immune system, a phenomenon often called immunosenescence, which may be responsible for an observed increase in morbidity and mortality from infectious disease and cancer in the elderly. While a variety of immune cells are known to be affected by aging, declined T cell function is the most striking and best characterized feature of immunosenescence. Both intrinsic changes in T cells and alteration in extrinsic factors are involved. Nutritional intervention has been promoted as a promising approach to delaying/reversing immunosenescence, and vitamin E is one of the best studied candidates in this regard. While vitamin E deficiency is rarely seen, both animal and human studies suggest that intake above currently recommended levels may help restore T cell function which becomes impaired with aging. This effect of vitamin E can be accomplished by directly impacting T cells as well as indirectly, by inhibiting production of prostaglandin E2, a T cell-suppressing lipid mediator known to increase with aging. Vitamin E-induced enhancements of immune functions may have significant clinical implications since vitamin E supplementation has been shown to be associated with both enhanced resistance to influenza infection in aged mice and reduced risk of acquiring upper respiratory infections in elderly human subjects. With a focus on our own work, this paper provides an overview on the beneficial effects of increased vitamin E intake on age-related decline in T cell function, the underlying mechanisms, and its clinical application in reducing the risk of infection.

Keywords: Aging, immune function, infection, nutrition, vitamin E.

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Article Details

VOLUME: 14
ISSUE: 4
Year: 2014
Page: [283 - 289]
Pages: 7
DOI: 10.2174/1871530314666140922143950
Price: $58

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