ascorbic-acid and Lymphatic-Diseases

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.

Topics: Aging; Animals; Antioxidants; Ascorbic Acid; Ascorbic Acid Deficiency; Atrophy; Calcium-Binding Proteins; Dietary Supplements; Immunologic Factors; Intracellular Signaling Peptides and Proteins; Leukocyte Count; Lymphatic Diseases; Macrophages; Male; Mice, Inbred C57BL; Mice, Knockout; Organ Size; Random Allocation; Specific Pathogen-Free Organisms; Spleen; T-Lymphocyte Subsets; Thymus Gland

In a study of the vitamin C status of 50 patients with malignant disease, 46 had leucocyte levels less than the lower limit of the normal range (18-50,μg/10(8) W.B.C.) and of these 30 had very low levels (< 12.5 μg/10(8) W.B.C.). Physical signs compatible with subclinical scurvy were frequently recorded and there was a significant decrease in capillary fragility in those with the lowest levels. Most patients had an inadequate dietary intake of ascorbic acid-containing foods and this was felt to be the major factor in producing the vitamin depletion.

Topics: Adult; Ascorbic Acid; Ascorbic Acid Deficiency; Bronchial Neoplasms; Capillary Fragility; Colonic Neoplasms; Diet; Humans; Leukocytes; Lymphatic Diseases; Neoplasms; Rectal Neoplasms; Scurvy; Stomach Neoplasms

Topics: Animals; Ascorbic Acid; Coumarins; Disease Models, Animal; Ligation; Lymphatic Diseases; Male; Massage; Pantothenic Acid; Plethysmography; Pyridoxine; Rats; Thiamine

Topics: Ascorbic Acid; Chronic Disease; Hematologic Diseases; Humans; Lymphatic Diseases; Neoplasms; Vitamins

Topics: Ascorbic Acid; Hemorrhage; Humans; Lymphatic Diseases; Palatine Tonsil; Pharynx