Journal
IMMUNOLOGICAL INVESTIGATIONS
Volume 44, Issue 2, Pages 189-198Publisher
TAYLOR & FRANCIS INC
DOI: 10.3109/08820139.2014.953635
Keywords
Atherosclerosis; gene expression; T-bet; IFN-gamma; vitamin A
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Funding
- Tehran University of Medical Sciences and Health Services [89-01-27-10471]
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Background: The aim of present study is evaluation of vitamin A supplementation efficacy on IFN-gamma and T-bet gene expression in atherosclerotic patients. Methods: Thirty-one patients and 15 healthy controls participated in this study. Healthy control and patients in Vitamin A group received 25 000 IU retinyl palmitate daily for 4 months. Control patients also received 1 pearl of placebo per day up to 4 months. Gene expression levels were assessed by real-time PCR using SYBR green detection method. Results: IFN-g gene expression in fresh cells of patients taking vitamin A declined slightly (0.85-fold, p = 0.068), whereas the expression of this gene was increased in patients taking placebo, and in healthy control subjects 1.2-fold (p = 0.267) and 1.7-fold (p = 0.580), respectively. There were no significant difference (p = 0.159) between 3 groups in terms of IFN-g gene expression in cells stimulated with PHA. In order to determine whether PHA stimulation of PBMCs in vitro had an effect on T-bet expression, we measured the difference between the 3 groups of studied. The results showed significant differences between the groups (p = 0.046). IFN-g gene expression in cells activated with ox-LDL in healthy control subjects and patients taking vitamin A, was reduced 0.43 (p = 0.0001) and 0.41 (p = 0.001) respectively, but in placebo patients was increased 2.2-fold (p = 0.959). Conclusion: Considering role of vitamin A on suppression of Th1 cells in atherosclerotic patients, it can be concluded that vitamin A supplementation may be advantageous for these patients.
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