Vitamin E enhances T cell differentiation through increased epithelial cell function in rat thymus

Satoru Moriguchi, Tsunetoshi Itoh

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This study was designed to elucidate the mechanism on increased T cell differentiation in thymus following vitamin E supplementation and discussed on the changes of epithelial cell (TEC) and macrophage functions in thymus following vitamin E supplementation. Thymic epithelial cells isolated by panning method from thymocytes of rats fed the nigh vitamin E (500 IU α- tocopherol nicotinate/kg) diet for 7 weeks increased the proportion of CD4+CD8- T cells in thymocytes. In addition, when thymic epithelial cell line IT45-R1 was pretreated with vitamin E for 24 h and then incubated with immature T cells for 48 h, they also enhanced the proportion of CD4+CD8-T cells in thymocytes. On the contrary, the supernatant of IT45-R1 treated in vitro with vitamin E for 24 h did not have any effect on the proportions of T cell subsets in thymocytes. Furthermore, in vitro treatment with vitamin E significantly enhanced the binding capacity of TEC to immature T cells. The expression of adhesion molecule, ICAM-1, on the membrane of TEC was also greatly increased by nigh vitamin E diet. However, in vitro incubation with macrophages isolated from rots fed the regular or nigh vitamin E diet did not induce a significant difference in the changes of T cell subsets in immature T cells. These results suggest that vitamin E enhances T cell differentiation through the increase of not macrophage but TEC function in thymus, which is associated with the increased binding capacity of TEC to immature T cells via increased expression of ICAM-1.

Original languageEnglish
Pages (from-to)873-883
Number of pages11
JournalNutrition Research
Volume17
Issue number5
DOIs
Publication statusPublished - 1997 May

Keywords

  • Adhesion molecules
  • ICAM-1
  • T cell subsets
  • Thymic epithelial cells (TEC)
  • Vitamin E

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Endocrinology
  • Nutrition and Dietetics

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