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Vitamin C Promotes Maturation of T Cells.
MedLine Citation:
PMID:  23249337     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Aims: Vitamin C (ascorbic acid) is thought to enhance immune function, but the mechanisms involved are obscure. We utilized an in vitro model of T cell maturation to evaluate the role of ascorbic acid in lymphocyte development. Results: Ascorbic acid was essential for the developmental progression of mouse bone marrow-derived progenitor cells to functional T lymphocytes in vitro and also played a role in vivo. Ascorbate-mediated enhancement of T cell development was lymphoid cell-intrinsic and independent of T cell receptor (TCR) rearrangement. Analysis of TCR rearrangements demonstrated that ascorbic acid enhanced the selection of functional TCRαβ after the stage of β-selection. Genes encoding the co-receptor CD8 as well as the kinase ZAP70 were upregulated by ascorbic acid. Pharmacologic inhibition of methylation marks on DNA and histones enhanced ascorbate-mediated differentiation, suggesting an epigenetic mechanism of Cd8 gene regulation via active demethylation by ascorbate-dependent Fe2+ and 2-oxoglutarate-dependent dioxygenases. Innovation: We speculate that one aspect of gene regulation mediated by ascorbate occurs at the level of chromatin demethylation, mediated by Jumonji C (JmjC) domain enzymes that are known to be reliant upon ascorbate as a co-factor. JmjC domain enzymes are also known to regulate transcription factor activity. These two mechanisms are likely to play key roles in the modulation of immune development and function by ascorbic acid. Conclusion: Our results provide strong experimental evidence supporting a role for ascorbic acid in T cell maturation as well as insight into the mechanism of ascorbate-mediated enhancement of immune function.
Authors:
Jared Manning; Birgitta Mitchell; Daniel A Appadurai; Arvind Shakya; L Jeanne Pierce; Hongfang Wang; Vincent Nganga; Patrick C Swanson; James M May; Dean Tantin; Gerald J Spangrude
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-18
Journal Detail:
Title:  Antioxidants & redox signaling     Volume:  -     ISSN:  1557-7716     ISO Abbreviation:  Antioxid. Redox Signal.     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-19     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  100888899     Medline TA:  Antioxid Redox Signal     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
University of Utah, Medicine/Hematology, Salt Lake City, Utah, United States; manninja@slhs.org.
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