High Dietary Intake of Vitamin C Suppresses Age-Related Thymic Atrophy and Contributes to the Maintenance of Immune Cells in Vitamin C-Deficient Senescence Marker Protein-30 Knockout Mice
Open accessAbstract
Vitamin C (VC) is an essential nutrient for humans and certain other animals. It has antioxidant properties and has been reported to ameliorate oxidative damage to lipids, DNA and proteins. However, the effects of VC on immune function are poorly understood, especially the influence of long-term high-dose VC intake on the number and function of immune cells. In the present study, to evaluate the immune effects of VC, VC-deficient senescence marker protein-30 knockout (SMP30KO) mice were fed a diet containing the recommended level of VC (20 mg/kg per d; 0·02 % VC) or a high level of VC (200 mg/kg per d; 0·2 % VC) for 1 year. The plasma VC concentration of the 0·02 % group was the same as that of age-matched C57BL/6 mice after 1 year of feeding; however, plasma VC concentration and thymus weight were significantly higher in the 0·2 % VC group than in the 0·02 % VC group. The total counts of leucocytes, lymphocytes, granulocytes and monocytes in the peripheral blood, as well as the number of splenocytes and thymocytes, were all significantly higher in the 0·2 % VC group than in the 0·02 % VC group. In addition, the number of naive T cells in peripheral blood lymphocytes, the number of memory T-cell populations in splenocytes, and the number of cluster of differentiation (CD)4+CD8+or CD4+CD8−or CD4−CD8+T cells in thymocytes were all markedly higher in the 0·2 % VC group than in the 0·02 % VC group after 1 year of dietary treatment. These results suggest that a long-term high-dose intake of VC is effective in the maintenance of immune cells, partly through the suppression of age-related thymic involution in VC-deficient SMP30KO mice.
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Supplementation of ascorbic acid appears to prevent OS, immunosenescence, telomere attrition, disorganization of chromatin, and excessive secretion of inflammatory factors, and to prolong life.
“Supplementation of AA also appears to prevent OS, immunosenescence, telomere attrition, disorganization of chromatin, and excessive secretion of inflammatory factors, and to prolong life [122].”
From The Role of Antioxidants in the Interplay between Oxidative Stress and Senescence (2022) · cites this paper as [122]
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- Authors
- Uchio, R., Hirose, Y., Murosaki, S., Yamamoto, Y., & Ishigami, A.
- Affiliations
- House Wellness Foods Corporation (Japan) (JP)
- Tokyo Metropolitan Institute of Gerontology (JP)
- Corresponding author
- Uchio, Ryusei
- Venue
- British Journal of Nutrition
- Publisher
- Cambridge University Press (CUP)
- Published
- 2015-01-22
- Volume
- 113
- Issue
- 4
- Pages
- 603-609
- ISSN
- 0007-1145 (ISSN-L)
- 1475-2662
- OpenAlex
- W2114261034
- Cited by
- 39
- References
- 40
- Citations by year
- 2026: 1 · 2025: 2 · 2024: 4 · 2023: 3 · 2022: 8 · 2021: 4 · 2020: 4 · 2019: 6 · 2018: 5 · 2017: 2
- FWCI
- 2.25
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- British Journal Of Nutrition (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (15H04505)
- Topics
- Health Sciences › Nursing › Nutrition and Dietetics › Vitamin C and Antioxidants Research
- Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
- Health Sciences › Medicine › Biochemistry › Antioxidant Activity and Oxidative Stress
- Keywords
- vitamin C, thymic atrophy, thymic involution, aging, scurvy, T cells, naive T cells, memory T cells, thymocytes, lymphocyte count
- MeSH terms
- Aging, Animals, Antioxidants, Ascorbic Acid, Ascorbic Acid Deficiency, Atrophy, Calcium-Binding Proteins, Immunologic Factors, Leukocyte Count, Lymphatic Diseases, Macrophages, Male, Mice, Inbred C57BL, Organ Size, Random Allocation, Specific Pathogen-Free Organisms, Spleen, Thymus Gland, T-Lymphocyte Subsets, Mice, Knockout, Dietary Supplements, Intracellular Signaling Peptides and Proteins
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