Abstract
Background
Studies have demonstrated that vitamin C supplementation enhances the immune system, prevents DNA damage, and decreases the risk of a wide range of diseases. Other study reported that leukocyte vitamin C level was low in diabetic individuals compared with nondiabetic controls.
Aim of the work
To study the effect of vitamin C on oxidative stress, blood lipid profile, and T-cell responsiveness during streptozotocin (STZ)-induced type I diabetes mellitus.
Methods
Thirty male Sprague–Dawley rats were randomly split into three groups. The first served as a control group (n = 10) in which rats were injected with the vehicle alone. The second (n = 10) and the third groups (n = 10) were rendered diabetic by intraperitoneal (i.p.) injection of single doses of STZ (60 mg/kg body weight). The third group was supplemented with vitamin C (100 mg/kg body weight) for 2 months.
Results
T lymphocytes from the diabetic rats were found to be in a stunned state, with a decreased surface expression of the CD28 costimulatory molecule, low levels of phosphorylated AKT, altered actin polymerization, diminished proliferation and cytokine production, and, eventually, a marked decrease in abundance in the periphery. Vitamin C was found to significantly decrease the elevated levels of blood hydroperoxide, glucose, cholesterol, triglycerides and low-density lipoprotein (LDL) in diabetic rats. Furthermore, it was found to restore CD28 expression, AKT phosphorylation, actin polymerization, and polyfunctional T cells (IFN-γ- and IL-2-producing cells that exhibit a high proliferation capacity).
Conclusion
Vitamin C treatment restores and reconstitutes polyfunctional, long-lived T cells in diabetic rats.
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Abbreviations
- CFSE:
-
Carboxyfluorescein diacetate succinimidyl ester
- HDL-C:
-
High-density lipoprotein-cholesterol
- ICS:
-
Intracellular cytokine staining
- IFN-γ:
-
Interferon gamma
- IL-2:
-
Interleukin 2
- LDL-C:
-
Low-density lipoprotein-cholesterol
- PKB:
-
Protein kinase B (AKT)
- STZ:
-
Streptozotocin
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Acknowledgments
This research project was supported by King Saud University, College of Science Research Center, Project No: Zoo/2009/48. We thank Dr. Emad Ahmed of Zoology department, Assiut University, for revising the manuscript and figures.
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Badr, G., Bashandy, S., Ebaid, H. et al. Vitamin C supplementation reconstitutes polyfunctional T cells in streptozotocin-induced diabetic rats. Eur J Nutr 51, 623–633 (2012). https://doi.org/10.1007/s00394-011-0176-5
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DOI: https://doi.org/10.1007/s00394-011-0176-5